Humidification chamber and humidification system

Abstract

The utility model relates to a humidifying chamber. The humidifying chamber is constructed to be used together with a breathing loop assembly. The humidification chamber includes: a main body; a base connected to the main body; a cavity at least partially defined by the body and the base to hold a volume of liquid; an inlet into the cavity; an outlet exiting the cavity; and a circuit end cap configured to receive a breathing circuit component of the breathing circuit assembly.

Description

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 625,805, filed on January 26, 2024, No. 63 / 502,823, filed on May 17, 2023, and No. 63 / 501,858, filed on May 12, 2023, the entire contents of each of these U.S. patents being incorporated herein by reference. Technical Field

[0002] The present disclosure generally relates to humidification systems and components thereof, including humidification chambers for respiratory therapy systems that deliver a gas stream including pressurized breathing gas to a patient. More specifically, but not exclusively, the present disclosure relates to humidification chambers, humidification chambers having a circuit end cap for receiving respiratory circuit components, and humidification chambers having accessories (feed device connectors and port accessories), the accessories including features facilitating secure and reliable connections. Background Art

[0003] Respiratory therapy devices or systems for delivering a gas stream can be used to improve a patient's ventilation. Such devices or systems can be used to improve patient comfort and / or improve the prognosis of a patient's respiratory disorder.

[0004] In some systems, heated and humidified gas is delivered for various medical procedures or treatments. Multiple components in the system can be assembled together to provide heated and humidified gas to a patient. Many systems have a humidification chamber for holding a volume of liquid and associated respiratory circuit components connected to the humidification chamber.

[0005] Respiratory assist systems supply pressurized breathing gas to a patient for respiratory support (assisting an autonomously breathing patient) or life support (controlling each breath).

[0006] It has been shown that there are clinical benefits when one or more of the temperature and humidity of the breathing gas mimic the levels that naturally occur in a healthy human lung. These levels are typically about 37 degrees Celsius (°C) and 100% relative humidity.

[0007] Respiratory assist systems can include a humidifier to heat and humidify the pressurized breathing gas. The humidifier can include a humidification chamber configured to hold a volume of liquid (e.g., water). The humidification chamber can be heated by the humidifier to raise the temperature and / or humidity of the volume of water and the breathing gas in the headspace above the volume of water passing through the humidification chamber. A liquid conduit can supply water from a reservoir such as a sterile water bag to the humidification chamber to maintain or replenish the volume of water held by the humidification chamber.

[0008] A Luer connection can be used to connect a liquid conduit to a humidification chamber. In a medical environment, Luer connections are widely used for the transfer of fluids and gases. Luer connections are commonly used to connect various medical devices (such as syringes, catheters, and connectors) to each other in a variety of medical applications. A Luer connection typically includes a male Luer connector that is inserted into a rigid female Luer fitting.

[0009] The Luer connection between the liquid conduit of a respiratory assistance system and the humidification chamber is inexpensive, effective, familiar, and easy to use.

[0010] Accordingly, an object of the present utility model is to provide a humidification chamber or a respiratory therapy system having a humidification chamber that overcomes or at least partially ameliorates some of the above-mentioned drawbacks or at least provides a useful alternative to the public. Summary of the Utility Model

[0011] In accordance with certain features, aspects, and advantages of at least one of the configurations disclosed herein, a humidification chamber is configured to be used with a respiratory circuit assembly and includes:

[0012] A body;

[0013] A base connected to the body;

[0014] A cavity that is at least partially defined by the body and the base to hold a certain volume of liquid;

[0015] An inlet into the cavity;

[0016] An outlet out of the cavity; and

[0017] A circuit end cap that is configured to receive a respiratory circuit component of the respiratory circuit assembly.

[0018] In some configurations, the circuit end cap is configured to block an end of the respiratory circuit component.

[0019] In some configurations, the circuit end cap is integrally formed with the body.

[0020] In some configurations, the circuit end cap cannot be removed from the body.

[0021] In some configurations, the circuit end cap is provided on the body, outside the cavity and isolated from the cavity.

[0022] In some configurations, the circuit end cap does not form a passage into the cavity.

[0023] In some configurations, the circuit end cap protrudes from the body.

[0024] In some configurations, the circuit end cap extends substantially vertically from the top surface of the body.

[0025] In some configurations, the circuit end cap includes a height of at least 5 mm.

[0026] In some configurations, the circuit end cap includes an outer diameter between 8 mm and 30 mm.

[0027] In some configurations, the circuit end cap includes an outer diameter of 12 mm.

[0028] In some configurations, the circuit end cap includes an outer diameter that is substantially the same as the inner diameter of the breathing circuit component that the circuit end cap is configured to receive.

[0029] In some configurations, a sealed connection is formed between the sealing surface of the circuit end cap and the breathing circuit component.

[0030] In some configurations, the sealing surface of the circuit end cap is located on the outer perimeter of the circuit end cap, which is configured to engage with the inner surface of the breathing circuit component.

[0031] In some configurations, the sealed connection is tapered.

[0032] In some configurations, the size and geometry of the circuit end cap are configured to receive the breathing circuit component via a friction fit.

[0033] In some configurations, the circuit end cap includes a generally cylindrical shape.

[0034] In some configurations, the circuit end cap includes a generally smooth outer perimeter.

[0035] In some configurations, the circuit end cap is hollow.

[0036] In some configurations, the circuit end cap is solid.

[0037] In some configurations, the circuit end cap includes a generally flat top surface.

[0038] In some configurations, the circuit end cap includes a recessed top surface.

[0039] In some configurations, the circuit end cap includes a ribbed top surface.

[0040] In some configurations, the ribbed top surface includes a cross shape.

[0041] In some configurations, the ribbed top surface includes a Y shape.

[0042] In some configurations, the circuit end cap is located at or toward the central region on the top surface of the body.

[0043] In some configurations, the circuit end cap is located in the region between the inlet and the outlet on the top surface of the body.

[0044] In some configurations, the circuit end cap is offset from the center on the top surface of the body.

[0045] In some configurations, the inlet includes an inlet port that defines a passage into the chamber of the humidification chamber, and the outlet includes an outlet port that defines a passage out of the chamber of the humidification chamber, and the inlet port and the outlet port are configured to provide connections to a supply conduit and an inspiratory conduit, respectively.

[0046] In some configurations, a liquid fill port is also included.

[0047] In some configurations, a plug configured to block the liquid fill port is also included.

[0048] In some configurations, a tether configured to hold the plug to the body is also included.

[0049] In some configurations, the body includes a generally circular shape with generally smooth sides.

[0050] In some configurations, the body includes a dome shape.

[0051] In some configurations, the body and the base are removably attached to each other.

[0052] In some configurations, the humidification chamber further includes a sealing element located between the body and the base.

[0053] In some configurations, the circuit end cap is configured to support a Y - connector.

[0054] In some configurations, the circuit end cap is configured to support the patient end of a Y - connector.

[0055] According to certain features, aspects, and advantages of at least one of the configurations disclosed herein, a humidification system includes:

[0056] A humidification chamber according to any one of the preceding clauses; and

[0057] A breathing circuit assembly for providing a path for gas travel.

[0058] In some configurations, a heater base configured to heat at least some of the contents of the humidification chamber is also included.

[0059] In some configurations, the breathing circuit assembly includes a supply conduit, an inspiratory conduit, and an expiratory conduit.

[0060] In some configurations, the breathing circuit assembly includes a Y - connector configured to connect the inspiratory conduit and the expiratory conduit.

[0061] In some configurations, the circuit end cap is sized and configured to receive a Y - connector.

[0062] In some configurations, the humidification chamber includes a chamfered edge portion.

[0063] In some configurations, the chamfered edge portion is at least partially located on the top surface of the humidification chamber.

[0064] In some configurations, the humidification chamber includes more than one chamfered edge portion.

[0065] In some configurations, the humidification chamber includes a pair of chamfered edge portions located on opposite sides of the humidification chamber.

[0066] In some configurations, the humidification chamber includes a removal assist feature that is a cutout on the bottom edge of the humidification chamber.

[0067] In some configurations, the removal assist feature is a slot.

[0068] In some configurations, the removal assist feature is located on the lower edge of the body.

[0069] In some configurations, the removal assist feature does not extend to the top edge of the rim on the bottom of the humidification chamber.

[0070] In some configurations, the humidification system further includes a separation tool for assisting in separating the body of the humidification chamber from the base.

[0071] In some configurations, the separation tool is configured to engage the removal assist feature of the humidification chamber.

[0072] In some configurations, the separation tool is substantially flat.

[0073] In some configurations, the separation tool has a flat bottom region and an inclined top surface region.

[0074] In some configurations, the outlet is positioned further from the sidewall of the humidification chamber than the inlet.

[0075] In some configurations, the outlet is positioned further from the sidewall of the humidification chamber than the inlet.

[0076] In some configurations, the outlet is positioned closer to the center compared to the sidewall of the humidification chamber.

[0077] According to certain features, aspects, and advantages of at least one of the configurations disclosed herein, a breathing circuit kit is provided for use in a humidified breathing assistance system, the breathing circuit kit including:

[0078] A humidifying chamber, which is configured to contain a liquid. The humidifying chamber includes an inlet port for supplying the liquid to the interior of the humidifying chamber during use. The inlet port includes: a humidifying chamber aperture, which provides a passage for the liquid from an inlet end outside the humidifying chamber to an outlet end inside the humidifying chamber; a side wall, which defines a first portion of the humidifying chamber aperture, and the first portion of the humidifying chamber aperture tapers at least partially towards the outlet end of the humidifying chamber aperture; and a shoulder, which defines a second portion of the humidifying chamber aperture, and the shoulder extends inwards from the side wall.

[0079] A liquid conduit; and

[0080] A feed device connector, which includes a proximal portion and a distal portion. The proximal portion and the distal portion at least partially define a connector aperture extending from the proximal end of the feed device connector to the distal end of the feed device connector. Wherein, during use, the proximal portion is configured to be coupled to the liquid conduit, and the distal portion is configured to be coupled to the inlet port.

[0081] In some configurations, the diameter of the second portion of the humidifying chamber aperture can be smaller than the outer diameter of a connector conforming to ISO.

[0082] In some configurations, the diameter of the second portion of the humidifying chamber aperture can be larger than the outer diameter of a first connector conforming to ISO and smaller than the outer diameter of a second connector conforming to ISO, wherein the first connector conforming to ISO is different from the second connector conforming to ISO.

[0083] In some configurations, the shoulder can extend at least partially in a direction perpendicular to the axis of the humidifying chamber aperture.

[0084] In some configurations, the first portion of the humidifying chamber aperture can at least partially include a constant taper, preferably tapering at a ratio between about 5% and 7%, more preferably tapering at a ratio of about 6%.

[0085] In some configurations, the distal portion of the feed device connector can be configured to be coupled to the inlet port by an interference fit.

[0086] In some configurations, the inlet port can be configured such that when a first connector conforming to ISO is inserted into the inlet port during use, the first connector conforming to ISO contacts the shoulder.

[0087] In some configurations, the first portion of the humidifying chamber aperture can be configured to at least partially receive the distal portion, preferably receive between about 45% and 90% of the distal portion, more preferably receive between about 65% and 75% of the distal portion, and most preferably receive about 69% of the distal portion.

[0088] In some configurations, the inlet port and / or the feed device connector may be configured such that in use when the feed device connector engages the inlet port, the feed device connector does not contact the shoulder.

[0089] In some configurations, the inlet port and / or the feed device connector may be configured such that in use when the feed device connector engages the inlet port, the feed device connector is spaced apart from the shoulder by at least 1 mm, preferably between about 1 mm and 5 mm, more preferably about 3 mm.

[0090] In some configurations, the exterior of the feed device connector may taper at least partially towards the distal end of the feed device connector, preferably at least partially includes a constant taper, more preferably tapers at a rate between about 5% and 7%, more preferably at a rate of about 6%, and most preferably tapers at a rate substantially the same as the first portion of the humidification chamber aperture.

[0091] In some configurations, at least one and preferably both of the sidewall and the shoulder may include an annular shape in a cross-section through the axis of the humidification chamber aperture.

[0092] In some configurations, the shoulder may taper at least partially towards the outlet end of the inlet port, preferably the shoulder at least partially includes a variable taper.

[0093] In some configurations, the outer diameter of the distal portion at the distal end of the feed device connector may be between about 6 mm and 8 mm, preferably about 7 mm.

[0094] In some configurations, the first portion of the humidification chamber aperture may include one or more of the following: a longitudinal length between about 8.5 mm and 9 mm, preferably about 8.5 mm; a minimum diameter between about 6.7 mm and 6.9 mm, preferably about 6.7 mm or 6.8 mm; a maximum diameter between about 7.2 mm and 7.4 mm, preferably about 7.3 mm; a diameter that tapers between about 0.3 mm and 0.7 mm, preferably about 0.5 mm or 0.6 mm; and / or a minimum diameter that is substantially equal to or greater than the maximum diameter of the second portion of the humidification chamber aperture.

[0095] In some configurations, the humidification chamber aperture may taper at least partially from the upstream end of the second portion towards the outlet end of the inlet port.

[0096] In some configurations, the second portion of the humidification chamber aperture may include one or more of the following: a maximum diameter of no greater than about 3.3 mm; a diameter at the transition between the upstream surface and the edge of the shoulder that is no greater than 3.3 mm, such as about 3.2 mm; preferably a diameter at the upstream end of the second portion that is between about 41% and 46%, preferably about 44%, of the diameter of the humidification chamber aperture at the inlet end of the inlet port; and / or preferably a diameter at the upstream end of the second portion that is between about 3.1 mm and 3.3 mm, preferably about 3.2 mm.

[0097] In some configurations, the sidewall may include an outer surface that diverges outwardly from the inlet end of the inlet port.

[0098] In some configurations, the sidewalls of the inlet port preferably do not have threads.

[0099] In some configurations, the sidewall may project upwardly from the top of the humidification chamber.

[0100] In some configurations, the breathing circuit kit may include any one or more of the following: a humidifier supply tube configured to supply a flow of breathing gas to the gas inlet of the humidification chamber; a patient supply tube configured to receive a flow of breathing gas from the outlet of the humidification chamber and deliver the breathing gas flow toward the patient; an exhalation tube configured to receive exhaled gas from the patient and deliver the exhaled gas away from the patient; and a Y-piece configured to be fluidly coupled to the patient supply tube, the exhalation tube, and the patient interface.

[0101] In some configurations, the breathing circuit kit may include a port attachment that includes an adapter portion and a closure portion, the adapter portion and the closure portion being capable of selectively engaging the inlet port to respectively: render the inlet port suitable for fluidly coupling to an alternative feed device connector having a size and / or shape different from a feed device connector configured to be directly coupled to the inlet port, or close the inlet port.

[0102] In some configurations, the adapter portion may include a first end and a second end, the second end being configured to engage the inlet port, the first end and the second end at least partially defining an adapter aperture that extends through the adapter portion to provide a fluid flow path through the port attachment, at least one and preferably both of the adapter portion and the adapter aperture tapering at least partially from the first end to the second end, and the closure portion preferably being integrally formed with the adapter portion.

[0103] In some configurations, the port attachment may be tethered to the humidification chamber.

[0104] Certain features, aspects, and advantages of at least one of the configurations disclosed herein provide a humidification chamber for use in a humidified breathing assistance system. The humidification chamber is configured to contain a liquid and includes an inlet port for supplying the liquid to the interior of the humidification chamber in use. The inlet port includes:

[0105] a sidewall that defines a first portion of a humidification chamber aperture that provides a passage for the liquid from an inlet end external to the humidification chamber to an outlet end internal to the humidification chamber, the first portion of the humidification chamber aperture tapering at least partially towards the outlet end of the inlet port, and

[0106] a shoulder that defines a second portion of the humidification chamber aperture and extends inwards from the sidewall.

[0107] In some configurations, the diameter of the second portion of the humidification chamber aperture can be less than the outer diameter of an ISO-compliant connector.

[0108] In some configurations, the diameter of the second portion of the humidification chamber aperture can be greater than the outer diameter of a first ISO-compliant connector and less than the outer diameter of a second ISO-compliant connector, where the first ISO-compliant connector is different from the second ISO-compliant connector.

[0109] In some configurations, the shoulder can extend at least partially in a direction perpendicular to the axis of the humidification chamber aperture.

[0110] In some configurations, the first portion of the humidification chamber aperture can include at least partially a constant taper, preferably tapering at a rate between about 5% and 7%, more preferably at a rate of about 6%.

[0111] In some configurations, at least one of, and preferably both, the sidewall and the shoulder can include an annular shape in a cross-section through the axis of the humidification chamber aperture.

[0112] In some configurations, the shoulder can taper at least partially towards the outlet end of the inlet port, the shoulder preferably including a variable taper.

[0113] In some configurations, the first portion of the humidification chamber aperture can include one or more of the following: a longitudinal length between about 8.5 mm and 9 mm, preferably about 8.5 mm; a minimum diameter between about 6.7 mm and 6.9 mm, preferably about 6.7 mm or 6.8 mm; a maximum diameter between about 7.2 mm and 7.4 mm, preferably about 7.3 mm; a diameter tapering at a rate between about 0.3 mm and 0.7 mm, preferably about 0.5 mm or 0.6 mm; and / or a minimum diameter that is substantially equal to or greater than the maximum diameter of the second portion of the humidification chamber aperture.

[0114] In some configurations, the humidification chamber aperture can taper at least partially from the first end of the second portion toward the outlet end of the inlet port.

[0115] In some configurations, the second portion of the humidification chamber aperture can include one or more of the following: a maximum diameter not greater than about 3.3 mm; a diameter at the transition between the upstream surface and the edge of the shoulder, which is not greater than 3.3 mm, such as about 3.2 mm; preferably a diameter at the upstream end of the second portion, which is between about 41% and 46%, preferably about 44%, of the diameter of the humidification chamber aperture at the inlet end of the inlet port; and / or preferably a diameter at the upstream end of the second portion, which is between about 3.1 mm and 3.3 mm, preferably about 3.2 mm.

[0116] In some configurations, the sidewall can include an outer surface that diverges outward from the inlet end of the inlet port.

[0117] In some configurations, the sidewall of the inlet port preferably does not have threads.

[0118] In some configurations, the sidewall of the inlet port can project upward from the top of the humidification chamber.

[0119] In some configurations, the humidification chamber can include a port attachment that includes an adapter portion and a closure portion, the adapter portion and the closure portion being capable of selectively engaging the inlet port to respectively: render the inlet port suitable for fluidly coupling to an alternative feed device connector having a size and / or shape different from a feed device connector configured to be directly coupled to the inlet port, or close the inlet port.

[0120] In some configurations, the adapter portion can include a first end and a second end, the second end being configured to engage the inlet port, the first end and the second end at least partially defining an adapter aperture that extends through the adapter portion to provide a fluid flow path through the port attachment, at least one and preferably both of the adapter portion and the adapter aperture tapering at least partially from the first end to the second end, and the closure portion preferably being integrally formed with the adapter portion.

[0121] In some configurations, the adapter portion can be tethered to the humidification chamber.

[0122] In accordance with certain features, aspects, and advantages of at least one of the configurations disclosed herein, there is provided a water feed device assembly for use in a respiratory assistance system, the water feed device assembly including:

[0123] A liquid conduit;

[0124] A water source connector, such as a spike, configured to be fluidly coupled to the first end of the liquid conduit; and

[0125] A feed device connector includes a proximal portion and a distal portion. The proximal portion and the distal portion at least partially define a connector bore extending from the proximal end to the distal end of the feed device connector to provide a fluid flow path through the feed device connector. In use, the proximal portion is configured to be fluidly coupled to a second end of a liquid conduit, and the distal portion is configured to be fluidly coupled to an inlet port of a humidification chamber of a respiratory assistance system.

[0126] In some configurations, the feed device connector may be at least partially tapered towards the distal end of the feed device connector, preferably at least partially including a constant taper rate, more preferably tapering at a rate between about 5% and 7%, and more preferably tapering at a rate of about 6%.

[0127] In some configurations, the outer diameter of the feed device connector at the distal end may be between about 6 mm and 8 mm, preferably about 7 mm.

[0128] In some configurations, at least one of the proximal portion and the distal portion may include a substantially frustoconical shape, and the feed device connector preferably includes a flange located between the proximal portion and the distal portion.

[0129] According to certain features, aspects, and advantages of at least one of the configurations disclosed herein, a port attachment is provided for use with a humidification chamber in a respiratory assistance system. The port attachment includes:

[0130] An adapter portion including a first end and a second end. The first end and the second end define an adapter bore that extends through the adapter portion to provide a fluid flow path through the port attachment. The second end is configured to selectively engage with an inlet port of the humidification chamber, and at least one and preferably both of the adapter portion and the adapter bore are at least partially tapered from the first end to the second end; and

[0131] A closure portion integrally formed with the adapter portion. The closure portion is configured to selectively engage with the inlet port of the humidification chamber to close or seal the inlet port in use.

[0132] According to certain features, aspects, and advantages of at least one of the configurations disclosed herein, a port attachment is provided for use with a humidification chamber in a respiratory assistance system. The humidification chamber includes an inlet port configured to engage with a first feed device connector. The port attachment includes an adapter portion and a closure portion, and the port attachment is configured to be selectively engageable with the inlet port of the humidification chamber in one of an adapted configuration and a closed configuration, wherein:

[0133] In an adapter configuration, an adapter portion is configured to engage and fluidly couple with an inlet port and a second feed device connector that is different from the first feed device connector, and

[0134] In a closed configuration, a closure portion is configured to engage the inlet port to seal or close the inlet port.

[0135] In some configurations, the port attachment includes a protruding rib, and the protruding rib is configured to serve as a separation tool.

[0136] In some configurations, the protruding rib is configured to engage one or more removal features of the body and / or base of the humidification chamber to assist in disassembling the body from the base of the humidification chamber.

[0137] In some configurations, a humidification chamber is provided for respiratory humidification or surgical humidification. The humidification chamber includes: a hollow body including an inlet port and an outlet port; a heat-conducting body; and a sealing element configured to provide a seal between the hollow body and the heat-conducting body during assembly; wherein the heat-conducting body is configured to be removably attachable to the hollow body and has a heat capacity of less than about 30 joules per kelvin (J / K), less than about 27 J / K, between about 16 J / K and 27 J / K, between about 19 J / K and 24 J / K, between about 20 J / K and 22 J / K, about 21 J / K, or between about 20.7 J / K and 21.2 J / K.

[0138] In some configurations, the heat-conducting body may include an aluminum alloy material.

[0139] In some configurations, the heat-conducting body may have a thickness between about 0.2 mm and 1.2 mm, between about 0.2 mm and 1 mm, between about 0.4 mm and 0.9 mm, between about 0.6 mm and 0.8 mm, or about 0.7 mm.

[0140] In some configurations, the heat-conducting body may have a thermal conductivity between about 12 W / mK and 286 W / mK, between about 88 W / mK and 251 W / mK, between about 170 W / mK and 230 W / mK, about 227 W / mK, or between about 190 W / mK and 210 W / mK.

[0141] In some configurations, the heat-conducting body may be anodized.

[0142] In some structures, the heat-conducting body may have a specific heat capacity between about 0.5 J / gK and 1.5 J / gK, between about 0.7 J / gK and 1.1 J / gK, between about 0.8 J / gK and 1 J / gK, or about 0.9 J / gK.

[0143] In some configurations, the heat conductor may have a mass between about 10 g and 100 g, between about 15 g and 50 g, between about 20 g and 25 g, or be about 23 g.

[0144] In some configurations, the humidification chamber may include one or more removal features configured to assist in removing the humidification chamber.

[0145] In some configurations, the humidification chamber may include a surrounding member that is integral with, attached to, or attachable to the heat conductor and is configured to engage a base unit of the humidifier in use.

[0146] In some configurations, the surrounding member may be overmolded onto the heat conductor.

[0147] In some configurations, the surrounding member may include one or more removal features configured to assist in removing the humidification chamber.

[0148] In some configurations, the heat conductor may include a contact wall configured to be in thermal contact with a heater plate in use, the contact wall having a uniform thickness between about 0.2 mm and 1.2 mm, between about 0.2 mm and 1 mm, between about 0.4 mm and 0.9 mm, between about 0.6 mm and 0.8 mm, or being about 0.7 mm.

[0149] In some configurations, the heat conductor and / or the surrounding member may at least partially define a channel configured to receive and hold a sealing element in use.

[0150] In some configurations, a humidification chamber for respiratory humidification or surgical humidification is provided, the humidification chamber including: a hollow body including an inlet port and an outlet port; a heat conductor configured to be removably attached to the hollow body, the heat conductor including a contact wall; and a surrounding member that is integral with, attached to, or attachable to the heat conductor and includes removal features; wherein the hollow body and the heat conductor are configured to at least partially define a chamber configured to hold a volume of water in use.

[0151] In some configurations, the removal feature may include a stepped region configured to form a slot between the surrounding member and the hollow body when the humidification chamber is assembled in use.

[0152] In some configurations, the slot may be configured to receive an instrument.

[0153] In some configurations, the sealing element may be configured to be located near the heat conductor and the surrounding member, the sealing element being configured to provide a seal between one or more of the heat conductor or the surrounding member and the hollow body.

[0154] In some configurations, the sealing element can be configured to provide a seal between the hollow body and the heat conducting body. For example, the upright wall of the heat conducting body.

[0155] In some configurations, the surrounding member can include a first portion proximate to the heat conducting body and a second portion remote from the heat conducting body, the first portion forming a shoulder configured to at least partially hold the sealing element, and the second portion including a removal feature.

[0156] In some configurations, the second portion can at least partially include a substantially uniform thickness between about 2.5 mm and 3.5 mm, such as about 3 mm.

[0157] In some configurations, the second portion of the surrounding member can be configured to act as a stop for the hollow body during the assembly of the humidification chamber in use.

[0158] In some configurations, the height of the removal feature can be between about 1 mm and 3 mm, such as about 2 mm.

[0159] In some configurations, the width of the removal feature can be at least about 5 mm, between about 5 mm and 100 mm, between about 5 mm and 50 mm, between about 5 mm and 30 mm, between about 10 mm and 25 mm, or between about 15 mm and 20 mm, such as about 16 mm. In other examples, the width of the removal feature can be between about 10 mm and 20 mm, or between about 12 mm and 16 mm, such as about 14 mm. In other examples, the removal feature can extend around the entire perimeter of the humidification chamber.

[0160] In some configurations, the removal feature can be configured to assist in disassembling the hollow body and the heat conducting body.

[0161] In some configurations, the surrounding member can include more than one removal feature.

[0162] In some configurations, the surrounding member can include between one and eight, or between two and six, such as four, removal features.

[0163] In some configurations, the humidification chamber can include a material different from the heat conducting body.

[0164] In some configurations, the surrounding member can include a polymer, such as polypropylene.

[0165] In some configurations, the heat conducting body can include a metal or an alloy, such as aluminum or stainless steel.

[0166] In some configurations, the humidification chamber can include overmolding onto the heat conducting body.

[0167] In some configurations, the humidification chamber can provide a negligible contribution to the heat capacity of the humidification chamber.

[0168] In some configurations, the humidification chamber can be configured such that inserting the device into the removal feature and manipulating (e.g., rotating and / or lifting) the device aids in the removal of the hollow body and the heat conducting body.

[0169] In some configurations, the combination of the heat conducting body and the surrounding member can be configured to be removably attached to the hollow body.

[0170] In some configurations, the heat conducting body can be configured to be removably attached to the hollow body via the surrounding member.

[0171] In some configurations, the surrounding member can be permanently connected to the heat conducting body.

[0172] In some configurations, the heat conducting body can include an upright wall extending from the contact wall, where the surrounding member is connected to the upright wall.

[0173] In some configurations, the humidification chamber can be functionally equivalent to an alternative humidification chamber.

[0174] In some configurations, the humidification chamber can be structurally different from the alternative humidification chamber.

[0175] In some configurations, the humidification chamber can be configured to provide a similar level of humidity to the medical gas when compared to an alternative humidification chamber having the same input conditions.

[0176] In some configurations, the alternative humidification chamber is a disposable humidification chamber.

[0177] In some configurations, the heat capacity of the humidification chamber can be within 15%, within 10%, within 5%, or within 2.5% of the alternative humidification chamber.

[0178] In some configurations, the heat conducting body can be configured to have a heat capacity within approximately ±5 J / K, within approximately ±2 J / K, within approximately ±1 J / K, or within approximately ±0.5 J / K of the heat capacity of the heat conducting body of the alternative humidification chamber.

[0179] In some configurations, the heat conducting body can be configured to have a heat capacity within approximately ±15%, within approximately ±10%, within approximately 5%, or within approximately 2.5% of the heat capacity of the heat conducting body of the alternative humidification chamber.

[0180] In some configurations, a heat conductor is provided and is configured to form part of a humidification chamber that is capable of engaging with a humidifier base unit to deliver humidified medical gas for respiratory or surgical treatment, wherein the heat conductor is configured to be removably attached to a polymer body to form the humidification chamber, and the heat conductor has a heat capacity of less than 30 joules per kelvin (J / K), less than about 27 J / K, between about 16 J / K and 27 J / K, between about 19 J / K and 24 J / K, between about 20 J / K and 22 J / K, about 21 J / K, or between about 20.7 J / K and 21.2 J / K.

[0181] In some configurations, the humidifier base unit can be configured to detect a low water or no water condition.

[0182] In some configurations, the humidifier base unit can be configured to determine the response of a first humidification chamber or a second humidification chamber plus a certain volume of water (if any) contained therein to a characteristic excitation signal applied to a heater plate.

[0183] In some configurations, the base unit can include a controller that is configured to detect one or more of a low water condition or a no water condition based on the response of a disposable humidification chamber or a reusable humidification chamber (including any liquid contained therein) to a characteristic excitation signal applied to a heater plate.

[0184] Further aspects, novel features, and advantages of the present disclosure will be apparent to those skilled in the art in accordance with any one or more of the illustrative examples set forth in the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0185] To easily identify the discussion of any particular element, the leftmost digit (s) in the reference numeral refers to the figure number in which the element is first introduced. In different drawings and / or examples, the same reference numeral may refer to the same feature.

[0186] From the detailed description herein with reference to the following drawings, particular embodiments and modifications thereof will become apparent to those skilled in the art, in which:

[0187] Figure 1 A schematic diagram of an exemplary respiratory treatment system is shown.

[0188] Figure 2 A schematic illustration of an exemplary respiratory assistance system is shown.

[0189] Figure 3 A schematic illustration of another exemplary respiratory assistance system supplying respiratory gas to a patient in use is shown.

[0190] Figure 4It is a schematic illustration of a humidifier and water feeding device assembly for a respiratory assistance system.

[0191] Figure 5 A front perspective view of the humidification chamber is shown.

[0192] Figure 6 A rear perspective view of the humidification chamber is shown.

[0193] Figure 7 A top view of the humidification chamber is shown.

[0194] Figure 8 A cross-section of the humidification chamber is shown.

[0195] Figure 9 An exploded view of the humidification chamber is shown.

[0196] Figure 10 A front perspective view of the humidification chamber is shown, where the respiratory circuit components are connected to the circuit end cap of the humidification chamber.

[0197] Figure 11 A front view of the humidification chamber with the respiratory circuit components connected, and a partial cross-section showing the interaction between the circuit end cap and the respiratory circuit components are shown.

[0198] Figure 12 A rear perspective view of an example of the humidification chamber with a circuit end cap is shown.

[0199] Figure 13 A front perspective view of an example of the humidification chamber with a circuit end cap is shown.

[0200] Figure 14 An example of a cross-section of the circuit end cap is shown.

[0201] Figure 15 An example of a cross-section of the circuit end cap is shown.

[0202] Figure 16 An example of a cross-section of the circuit end cap is shown.

[0203] Figure 17 A front perspective view of an example of the humidification chamber with a circuit end cap is shown.

[0204] Figure 18 Shows Figure 17 the front view of the humidification chamber.

[0205] Figure 19 Shows Figure 17 the side view of the humidification chamber.

[0206] Figure 20 Shows as Figure 18 shown in the cross-section.

[0207] Figure 21 shows as Figure 19 the cross-section shown.

[0208] Figure 22 shows as Figure 18 the detailed view shown.

[0209] Figure 23 shows as Figure 20 the detailed view of the cross-section of the humidification chamber and the separation tool shown.

[0210] Figure 24 shows the perspective view of the humidification chamber and the separation tool.

[0211] Figure 25 is the perspective view of an exemplary humidification chamber and water feeding device assembly.

[0212] Figure 26 is the perspective view of the heat conductor and the surrounding member.

[0213] Figure 27 is the top view of the heat conductor and the surrounding member.

[0214] Figure 28 is Figure 26 and 27 the cross-sectional view of the heat conductor and the surrounding member in the embodiment shown.

[0215] Figure 29 is Figure 28 the cross-sectional view of the heat conductor and the surrounding member in the embodiment shown.

[0216] Figure 30 is Figure 28 the front view of the heat conductor and the surrounding member in the embodiment shown.

[0217] Figure 31 is Figure 28 the perspective view of the heat conductor and the surrounding member in the embodiment shown.

[0218] Figure 32 is Figure 28 the detailed view of the heat conductor and the surrounding member in the embodiment shown.

[0219] Figure 33 is Figure 28 the bottom view of the heat conductor and the surrounding member in the embodiment shown.

[0220] Figure 34 is the perspective view of a humidifier including a base unit and a humidification chamber during installation according to another example.

[0221] Figure 35 is Figure 34 the perspective view of the humidifier, where the humidification chamber is installed on the base unit.

[0222] Figure 36 It is an exploded detail view of an exemplary inlet port of a humidification chamber and an exemplary feed device connector of a water feed device assembly.

[0223] Figure 37 It is a cross-sectional view of the inlet of the humidification chamber.

[0224] Figure 38 It is a plan view of the inlet of the humidification chamber.

[0225] Figure 39 It is a cross-sectional view of the inlet of the humidification chamber, including a detailed view of the shoulder of the inlet port and the side wall.

[0226] Figure 40 It is a cross-sectional view of another exemplary inlet port of the humidification chamber.

[0227] Figure 41 It is a plan view of another exemplary inlet port of the humidification chamber.

[0228] Figure 42 It is a perspective view of the feed device connector of the water feed device assembly.

[0229] Figure 43 It is a side view of the feed device connector of the water feed device assembly.

[0230] Figure 44 It is a perspective view of another exemplary feed device connector for the water feed device assembly.

[0231] Figure 45 It is a perspective view of another exemplary feed device connector for the water feed device assembly.

[0232] Figure 46 It is a perspective view of another exemplary feed device connector for the water feed device assembly.

[0233] Figure 47 It is a perspective view of another exemplary feed device connector for the water feed device assembly.

[0234] Figure 48 It is a cross-sectional view of the feed device connector and the inlet port engaged in use.

[0235] Figure 49 It is a perspective view of a port attachment that can be engaged with the inlet port of the humidification chamber.

[0236] Figure 50 It is a cross-sectional view of the port attachment.

[0237] Figure 51 It is a perspective view of the port attachment engaged with the inlet port of the humidification chamber in a closed configuration.

[0238] Figure 52 It is a cross-sectional view of a port attachment that engages with the inlet port of the humidification chamber in a closed configuration.

[0239] Figure 53 It is a perspective view of a port attachment that engages with the inlet port of the humidification chamber in a mating configuration.

[0240] Figure 54 It is a perspective view of a port attachment that engages with the inlet port of the humidification chamber and an alternative feed device connector in a mating configuration.

[0241] Figure 55 It is a cross-sectional view of a port attachment that engages with the inlet port of the humidification chamber in a mating configuration.

[0242] Figure 56 It is a perspective view of another exemplary port attachment.

[0243] Figure 57 It is a perspective view of another exemplary port attachment. Detailed Description

[0244] Although certain examples are described below, those skilled in the art will understand that the present disclosure extends beyond the specifically disclosed examples and / or uses and their obvious modifications and equivalents. Therefore, the scope of the disclosure herein should not be limited by any of the specific examples described below.

[0245] System Overview

[0246] Figures 1 to 4 An exemplary system described below is shown. Although each system is described separately, it should be understood that each system shares similar features, where similar features can be easily replaced between the exemplary systems. Additionally, it should be understood that the components, elements, and features of one exemplary system can be provided, either alone or in combination with other components, elements, and features of the same exemplary system, to one or more other exemplary systems.

[0247] Figure 1 A first exemplary system is shown in

[0248] Reference Figure 1 , the construction of the humidification system 100 is shown. The humidification system 100 has a humidification chamber 104 for holding a volume of liquid (such as water), and a breathing circuit or breathing circuit assembly for providing a path (multiple paths) for gas to travel through the humidification system 100 to the user 128 and from the user through the humidification system.

[0249] In some constructions, the humidification system 100 includes a heater base 102. The heater base 102 heats the humidification chamber 104 and causes at least some of the contents of the humidification chamber 104 to evaporate.

[0250] In some configurations, the humidification system 100 further includes a gas supply unit 130. The gas supply unit 130 can be a ventilator or other suitable pressurized gas source adapted for breathing or for medical procedures.

[0251] Referring again to Figure 1 , the breathing circuit assembly 100 can include a supply conduit 120, an inhalation conduit 122, and in some configurations, an exhalation conduit 124. The gas supply end of the supply conduit 120 is configured to be connected to the output portion 132 of the gas supply unit 130, and the chamber end of the supply conduit 120 is configured to be connected to the inlet 113 of the humidification chamber 104. The chamber end of the inhalation conduit 122 is configured to be connected to the outlet 114 of the humidification chamber 104, and the user end of the inhalation conduit 122 is configured to be connected to the user 128, for example, via an interface 126. The user end of the exhalation conduit 124 is configured to be connected to the interface 126, and the gas supply end of the exhalation conduit 124 is configured to be connected to the return portion 134 of the gas supply unit 130. The user ends of the inhalation conduit 122 and the exhalation conduit 124 can be connected to the interface 126 via, for example, a Y-piece 127, but is not limited thereto.

[0252] In use, gas can flow from the gas supply unit 130 through the supply conduit 120 and into the humidification chamber 104 via the inlet 113 of the humidification chamber. The gas is humidified within the humidification chamber 104 and exits the humidification chamber 104 through the outlet 114 of the humidification chamber. The user inhales the humidified gas supplied through the inhalation conduit 122 and exhales into the exhalation conduit 124. The inhalation conduit 122 and / or the exhalation conduit 124 can each include a heating element (such as a heating wire) to help maintain the gas at a desired temperature and reduce the likelihood of significant condensation forming in the conduits. Optionally, the system can include a temperature sensor, for example, at the humidification chamber 104 and / or at the patient end of the system towards the (one or more) conduits.

[0253] In some configurations, the respiratory therapy system 100 can be configured to be reusable. For example, the components of the system can be reprocessed and disinfected for reuse. Thus, it can be understood that in some configurations, the surfaces are designed to have no or fewer dirt-trapping portions, where, for example, a smooth surface may be desired. In these reusable configurations, the components can be made of materials that can withstand high temperatures and the range of chemicals present during the expected reprocessing and disinfection processes.

[0254] Figures 2 to 4 Another exemplary system is shown.

[0255] Figure 2is a schematic diagram of an exemplary respiratory assistance system 100. The respiratory assistance system 100 can broadly include a gas source 101, a flow generator 105, a humidifier supply tube 120, a humidifier 108, and an inspiratory tube 122.

[0256] The gas source 101 supplies respiratory gas (e.g., air, i.e., a mixture of nitrogen, oxygen, argon, water vapor, and a tracer gas) to the flow generator 105. In some examples, the gas source 101 can be a wall-mounted source, a compressed gas cylinder, or the ambient environment.

[0257] The flow generator 105 can be, for example, part of a gas supply section 130 and can pressurize or regulate the pressure of the respiratory gas received from the gas source 101. The flow generator 105 can be configured to control the pressure, volume, or flow rate of the respiratory gas supplied to a patient (not shown).

[0258] The humidifier supply tube 120 receives the pressurized respiratory gas from the flow generator 105 and conveys it to the humidifier. In the exemplary respiratory assistance system 100, the flow generator 105 and the humidifier 108 are separate devices. In other examples, the flow generator 105 and the humidifier 108 can be integrated in a single device (e.g., within a single housing). In such examples, the humidifier supply tube 120 can be or include an internal tube located within the housing of the integrated device.

[0259] The humidifier 108 of the exemplary respiratory assistance system 100 can broadly include a heater base 102 and a humidification chamber 104. The humidifier 108 can be an F&P 810 TM 、820 TM 、850 TM or 950 TM heated humidifier available, for example, from Fisher&Paykel Healthcare Limited of Auckland, New Zealand.

[0260] The heater base 102 can include a heater plate 116 (hidden under the humidification chamber 104 in Figure 2 ). The heater plate 116 can be electronically controlled by a controller (not shown) that can be configured to regulate one or more of the temperature and humidity of the respiratory gas.

[0261] The humidification chamber 104 can include a gas inlet 113 and a gas outlet 114. The gas inlet 113 can be configured to couple to the humidifier supply tube 120. The gas outlet 114 can be configured to connect to the inspiratory tube 122.

[0262] The humidification chamber 104 can be configured to removably engage with the heater base 102. The removable engagement can facilitate cleaning or replacement of the humidification chamber 104.

[0263] The humidification chamber 104 may include a hollow body and a heat conducting body. The heat conducting body may form the base of the humidification chamber 104. In some examples, the heat conducting body may alternatively or additionally form at least a portion of the side of the humidification chamber. The heat conducting body may be formed of a metallic material. The hollow body may form the side and top of the humidification chamber. The hollow body may be translucent or transparent. The hollow body may be formed of a plastic material. In some examples, the heat conducting body may be crimped to the hollow body.

[0264] The humidification chamber 104 may be configured to hold a volume of liquid, such as water. The humidification chamber 104 may be configured to engage with the heater base 102 such that it is in thermal engagement with the heater plate 116. During use, heat energy from the heater plate 116 may cause the liquid held by the humidification chamber 104 to warm. The warming of the liquid may in turn warm the breathing gas and / or cause the liquid to evaporate for uptake by the breathing gas that enters the humidification chamber 104 through the gas inlet 113, passes through the headspace of the humidification chamber 104, and exits through the gas outlet 114.

[0265] The inspiratory tube 122 receives pressurized and humidified breathing gas from the humidifier 108 and delivers them for delivery to a patient via a patient interface (not shown). The patient interface may be an invasive interface (e.g., an endotracheal tube or a tracheostomy tube) or a non-invasive interface (e.g., a full face mask, a total face mask, a face mask, a nasal mask, nasal pillows, or a nasal cannula).

[0266] As the breathing gas is conveyed along the length of the inspiratory tube 122, the inspiratory tube 122 may be heated, for example to increase or maintain the temperature of the breathing gas, reduce or maintain the relative humidity, and / or maintain the absolute humidity. Heating of the inspiratory tube 122 may mitigate condensation formed within the inspiratory tube 122. The inspiratory tube 122 may be heated by a heater (not shown) that may be disposed within the lumen of the inspiratory tube 122, embedded within the wall of the inspiratory tube 122, or disposed around the inspiratory tube along at least a portion of its length. In some examples, the heater may include a resistive heating wire within the lumen or embedded within the tube wall. The inspiratory tube 122 may include an electrical connector to receive power for the heating wire from the flow generator 105 or the humidifier 108. In some examples, the electrical connector may include a socket or a plug. In some examples, the electrical connector may be integrated as part of the tube connector 125. In other examples, the inspiratory tube 122 may include a water jacket and be heated by the circulation of heated water.

[0267] The inspiratory tube 122 may include a tube connector 125 for pneumatically coupling with the gas outlet 114 of the humidification chamber 104. The tube connector 125 may include an electrical connector 123 (e.g., a socket) to receive power for the heating wire from the humidifier 108.

[0268] The combination of the humidifier supply tube 120, the humidification chamber 104, and the inspiratory tube 122 of the exemplary respiratory assistance system 100 can be said to form a breathing circuit. More specifically, it is a single-branch breathing circuit. The gas exhaled by the patient and any excess breathing gas provided by the inspiratory tube 122 but not inhaled by the patient (collectively referred to as exhaled gas) can be discharged into the atmosphere.

[0269] In other examples, the respiratory assistance system can include a double-branch breathing circuit. The double-branch breathing circuit can include an expiratory tube to convey the breathing gas back to a gas return gas inlet (not shown) of the flow generator 105. The expiratory tube can be heated like the above-described inspiratory tube to reduce condensation. The expiratory tube can additionally or alternatively be at least partially formed of a breathable material that allows water molecules to pass through the wall of the expiratory tube.

[0270] The humidifier supply tube 120, the humidification chamber 104, and the inspiratory tube 122 can be sold separately. Alternatively, one or more of them can be packaged together as a breathing circuit kit. The breathing circuit kit can be pre-assembled. Pre-assembly can reduce the risk of misconnection.

[0271] The breathing circuit and / or the breathing circuit kit can include additional components, such as an expiratory tube, a filter, a water separator, a Y-piece, a water feeding device assembly, a feeding device connector, a liquid conduit, a water source connector (e.g., a spike), a port attachment, a tube adapter, a conduit mount, and a patient interface (none of which are shown in Figure 2 ).

[0272] Reference Figure 3 provides a schematic diagram of another exemplary respiratory assistance system 200. Except as described below or as apparent from the drawings, Figure 3 the exemplary respiratory assistance system 200 can be similar to Figure 2 the respiratory assistance system 100. The details and variations described above are intended to apply equivalently to this example, and vice versa.

[0273] The gas source 101 of the respiratory assistance system 200 can be the air in the surrounding environment around the flow generator 105.

[0274] The flow generator 105 of the respiratory assistance system 200 can be a ventilator. Specifically, it is a room entrainment ventilator that pressurizes ambient air. The flow generator 105 can include a gas inlet 202 for sucking ambient air. The flow generator 105 can include a blower 205 that pressurizes the ambient gas as breathing gas for supply to the patient. In some examples, the ambient gas can be supplemented with one or more supplemental gases (e.g., oxygen).

[0275] The flow generator 105 of the respiratory assistance system 200 may include a flow generator user interface 206. The flow generator user interface 206 may provide visual, auditory, and / or tactile outputs to the user. The flow generator user interface 206 may include one or more displays, speakers, lights, etc. The flow generator user interface 206 may receive input from the user. The flow generator user interface 206 may include a touchscreen display. The flow generator user interface 206 may include one or more physical or on-screen buttons, dials, and sliders, or any combination thereof.

[0276] The flow generator 105 of the respiratory assistance system 200 may include one or more flow generator sensors 208. The one or more flow generator sensors 208 may be used to detect characteristics of the breathing gas and / or the blower 205.

[0277] The flow generator 105 of the respiratory assistance system 200 may include a flow generator controller 210. The flow generator controller 210 may control the blower 205 to provide a set flow rate, pressure, or volume of breathing gas. The control of the blower 205 may be based on user input received via the flow generator user interface 206 and / or sensor input received from the flow generator sensors 208.

[0278] The humidifier 108 of the respiratory assistance system 200 may include a humidifier user interface 212. The humidifier user interface 212 may provide visual, auditory, and / or tactile outputs to the user. The humidifier user interface 212 may include one or more displays, speakers, lights, etc. The humidifier user interface 212 may receive input from the user. The humidifier user interface 212 may include a touchscreen display. The humidifier user interface 212 may include one or more physical or on-screen buttons, dials, and sliders, or any combination thereof.

[0279] The humidifier 108 of the respiratory assistance system 200 may include one or more humidifier sensors 214. The humidifier sensors 214 may include one or more of a heater plate temperature sensor, an ambient air temperature sensor, a humidification chamber outlet temperature sensor, and a patient end temperature sensor. For example, the humidifier sensors 214 may sense the temperature of one or more of the heater plate 116, the ambient air, and the breathing gas at the gas outlet 114 of the humidification chamber 104 and at the patient end of the inhalation conduit 122.

[0280] The humidifier 108 of the respiratory assistance system 200 may include a humidifier controller 216. The humidifier controller 216 may control the operation of the heater plate 116 and / or the heating wire 218. The humidifier controller 216 may be configured to adjust the temperature and / or humidity of the breathing gas delivered to the patient. One or more humidifier sensors 214 may be used to detect characteristics of the breathing gas, the heater plate 116, and / or the humidification chamber 104. The humidifier controller 216 may be configured to control the temperature and / or humidity of the breathing gas according to settings (i.e., set temperature and / or set humidity) recorded by the humidifier user interface 212. For example, the temperature set point of the breathing gas may be between about 26 degrees Celsius (°C) and 43 °C, preferably between 29 °C and 40 °C. The absolute humidity of the breathing gas may be greater than about 12 milligrams per liter (mg / L), preferably greater than about 33 mg / L. The relative humidity of the breathing gas may be greater than about 80%, preferably greater than about 90%, and most preferably about 100%. The temperature and / or humidity of the breathing gas may depend on the respiratory therapy provided by the respiratory assistance system 200.

[0281] The humidifier 108 of the respiratory assistance system 200 may include electrical wires 220. The electrical wires 220 may be configured to connect to a socket in the tube connector 125 of the inspiratory tube 122. The electrical wires 220 may connect the heating wire 218 within the inspiratory tube 122 to the humidifier 108 to supply power under the control of the humidifier controller 216. The electrical wires 220 may connect the humidification chamber outlet temperature sensor to the humidifier controller 216. Additional electrical wires may connect the patient-side temperature sensor to the humidifier controller 216.

[0282] In some examples, the flow generator 105 and the humidifier supply tube 120 may be configured to communicate with each other via a communication channel 222. The communication channel 222 may be wired or wireless. One or more functions of the humidifier 108 may be configured to be controlled by the flow generator user interface 206 and / or the flow generator controller 210. One or more functions of the flow generator 105 may be configured to be controlled by the humidifier user interface 212 and / or the humidifier controller 216. In other examples, the flow generator 105 and the humidifier 108 may be integrated. In such an example, the integrated device may include a single user interface and / or controller for controlling the operation of both the flow generator and the humidifier.

[0283] The humidification chamber 104 can be configured to be removably received by the humidifier 108 in a horizontal direction. In such an example, the humidification chamber 104 can be described as a sliding humidification chamber. In other examples, the humidification chamber can be configured to be received by the humidifier in a vertical direction. In some such examples, the humidification chamber 104 can be described as a drop-in humidification chamber. In some examples, the humidifier 108 can include a compartment configured to receive and partially surround the humidification chamber. In some examples, the compartment can be substantially enclosed and / or sealed by a lid or door of the humidifier 108.

[0284] The heater plate 116 and the humidification chamber 104 can be biased towards each other to establish and maintain good thermal contact. In some examples, the heater plate 116 can be spring-loaded or otherwise elastically biased to provide an upward biasing force against the bottom of the humidification chamber 104. The humidification chamber 104 can be braced against this upward biasing force. In other examples, the humidifier 108 and / or the humidification chamber 104 can be configured to provide a downward biasing force against a fixed heater plate 116, or both the heater plate 116 and the humidification chamber 104 can be biased towards each other.

[0285] A patient interface 224 is provided for the patient 226 to supply humidified and pressurized breathing gas to the patient's airway. In this example, the patient interface 224 is a non-invasive interface in the form of a nasal mask. However, any non-invasive or invasive interface can alternatively be used.

[0286] The humidification chamber, breathing circuit kit, feed device connector, water feed device assembly, and / or port attachment of the present disclosure can be used with other respiratory assistance systems. With appropriate modifications, they can additionally or alternatively be used with other medical gas systems (such as surgical insufflation systems). They can be configured for treating adult, pediatric, or neonatal patients.

[0287] Figure 4 A humidifier 108 and a water feed device assembly 302 are shown ready for use in a respiratory assistance system (such as respiratory assistance system 100 or respiratory assistance system 200). The water feed device assembly 302 can be configured to supply a volume of water or other liquid to the interior of the humidification chamber 114.

[0288] The water feed device assembly 302 can include a feed device connector 305. As described in further detail below, the feed device connector 305 can be configured to be fluidly coupled to an inlet port of the humidification chamber 104.

[0289] The water feeding device assembly 302 may include a liquid conduit 306. The liquid conduit 306 may be fluidly coupled to the feeding device connector 305. The liquid conduit 306 may be attached to the feeding device connector 305 by means such as adhesive, sonic welding, interference fit, etc.

[0290] The water feeding device assembly 302 may include a water source connector 308. The water source connector 308 may be fluidly coupled to the liquid conduit 306. The water source connector 308 may be attached to the end of the liquid conduit 306 by means such as adhesive, sonic welding, interference fit, etc. As shown, in some examples, the water source connector 308 may be in the form of a spike. The spike may be configured to pierce a water source (such as a sterile water bag 310) to fluidly couple the water feeding device assembly 302 to the water contained in the water source.

[0291] In some examples, water may be supplied to the humidification chamber 104 by gravity feed. The sterile water bag 310 may be raised above the humidification chamber 104 during use to provide a water flow to the inlet port 402 and the interior of the humidification chamber 104 through the water source connector 308, the liquid conduit 306, and the feeding device connector 305.

[0292] In some examples, the humidification chamber 104 may have a valve (such as a float valve) to control the flow of water. In other examples, water may be supplied to the humidification chamber 104 by a pump. During use, the pump may be selectively operated to maintain or replenish the volume of water contained in the humidification chamber 104 as needed.

[0293] The terms "duct" and "tube" used throughout the disclosure should be understood as interchangeable at least for the characteristics of the suction tube 122 and the suction conduit 122, as well as the humidifier supply tube 120 and the supply conduit 120.

[0294] The systems disclosed above and the devices disclosed below may also be widely considered to include the components, elements, and features pointed out in the specification of this application, singly or in combination including any or all combinations of two or more of said components, elements, features, or systems.

[0295] The breathing circuit assembly may include a plurality of conduits, connectors, or other components. During the installation, storage, and / or transportation of the system, some components may not be used and may therefore be disassembled and separated from the rest of the assembly.

[0296] When the circuit is not assembled, the circuit components may be prone to ingress of dust or contaminants. In addition, some circuit components, especially smaller ones, may be misplaced when not assembled into the system.

[0297] In some systems, components can be placed on a surface or suspended from a separate component of the system (such as a medical pole). During this time, these loose components (especially smaller components such as connectors) may be at risk of accidentally falling to the ground and may become contaminated or completely lost. In addition, most breathing circuit components include channels for gas to travel through, and when the component is not connected and used in a breathing circuit assembly, it will be desirable to limit the entry of dust and contaminants into these channels.

[0298] As Figures 5 to 24 shown, the humidification chamber will be described below.

[0299] In some configurations, as Figure 5 and 6 best shown in, the humidification chamber 104 generally includes a body 110 and a base 111. The body 110 and the base 111 at least partially define a cavity 112 (best shown in Figure 8 and are designed to hold a certain volume of liquid.

[0300] The terms "hollow body" and "body" used throughout the disclosure should be understood as being interchangeable at least for the features of the body 110 and the hollow body 4100.

[0301] In some configurations, the body 110 and the base 111 are removably attached to each other. These components of the humidification chamber 104 can be disassembled for cleaning in cases where the humidification chamber is intended to be reusable. In other configurations, the body 110 and the base 111 are integrally formed or permanently connected.

[0302] In some configurations, as Figure 8 and Figure 9 shown, the humidification chamber 104 has a sealing element 119 between the body 110 and the base 111. Optionally, the sealing element 119 is an O-ring.

[0303] In some configurations, the body 110 includes a generally smooth side and optionally a generally circular shape (e.g., at least some circular perimeter). In these configurations, the geometry of the body 110 can help reduce the problem of dust or other contaminants accumulating on the humidification chamber. In addition, Figure 5 and 8 the circular perimeter (e.g., a slightly arched portion) on the top surface 118 of the body 110 shown can facilitate the outflow of liquid to prevent or at least limit the accumulation of liquid on the top of the humidification chamber. In some configurations, the body 110 has a dome shape.

[0304] In some configurations, the humidification chamber 104 is molded from a polymer. The polymer in some configurations may be able to withstand reprocessing cycles. In some configurations, the polymer is polysulfone.

[0305] Referring to Figure 5 the humidification chamber 104 in Figure 5 , the humidification chamber has an inlet 113 and an outlet 114. The inlet 113 provides an opening through the chamber wall of the main body 110 for fluid communication (e.g., gas supply) into the cavity, while the outlet 114 provides an opening for fluid communication (e.g., humidified gas) to leave the cavity. The chamber wall may be defined as the wall of the main body 110 and may include one or both of the top wall region and the side wall region of the main body. The chamber wall of the main body 110 defines at least a portion of the cavity 112. In some configurations, the inlet 113 and / or the outlet 114 are disposed on the top surface 118 of the main body 110. A breathing circuit assembly may be connected to and used with the humidification chamber 104 to provide a gas flow into and out of the humidification chamber.

[0306] In some configurations, the inlet 113 includes an inlet port that defines a passage into the cavity of the humidification chamber 104, and the outlet 114 includes an outlet port that defines a passage for leaving the humidification chamber cavity. The inlet port and the outlet port may respectively provide connections for the supply conduit 120 and the inspiratory conduit 122.

[0307] Optionally, the humidification chamber 104 also has a liquid filling port 115. Liquid may be introduced into the cavity 112 of the humidification chamber 104 via the liquid filling port 115. The respiratory system 100 may also include a liquid source (such as a water bag, a saline bag, etc.) configured to supply liquid to the humidification chamber 104.

[0308] In some configurations, as referred to in Figure 6 , the humidification chamber 104 also has a plug 121 configured to block the liquid filling port 115. When the liquid filling port 115 is not in use, the plug 121 may block the liquid filling port 115. Blocking the liquid filling port 115 may prevent the entry of dust or contaminants when the liquid filling port is not in use. Blocking the liquid filling port 115 prevents or reduces the flow of gas through the liquid filling port. Optionally, the humidification chamber 104 has a tether 117 configured to hold the plug 121 to the main body.

[0309] Referring to Figure 5 , in order to receive and store unused breathing circuit components, in some configurations, the humidification chamber 104 includes a circuit end cap 150. The circuit end cap 150 is configured to receive the breathing circuit components of the breathing circuit assembly (e.g., the ends of the Y-shaped connector 127).

[0310] It should be understood that in these configurations, when the breathing circuit components are not in use, the humidification chamber 104 having the ability to receive the breathing circuit components on itself can be advantageous as it reduces the likelihood of misplacing the breathing circuit components, since the circuit end cap keeps the breathing circuit components together with the central component (humidification chamber) of the system. The humidification chamber 104 can hold the breathing circuit components suspended (suspended from a table or other surface) and keep the components readily visible for future use. Other advantages of the humidification chamber 104 with the circuit end cap 150 can include providing a more environmentally friendly solution for blocking the passage of the breathing circuit components, since the end cap 150 can be reused whenever the humidification chamber is reused. Additionally, the integral circuit end cap 150 on the humidification chamber 104 can be beneficial as the breathing circuit components can be easily removed from the humidification chamber (as opposed to, for example, removing small tabs at the ends of the breathing circuit components).

[0311] In some configurations, the geometry of the circuit end cap 150 is configured to support or at least partially support the breathing circuit components. For example, the circuit end cap 150 can fully support the breathing circuit components or at least partially support the breathing circuit components. An auxiliary support separate from the humidification chamber 104 can be used to support the other end of the breathing circuit assembly, such as a long conduit (e.g., on a hook).

[0312] The circuit end cap 150 can receive the end of the breathing circuit component (e.g., the end of the Y - shaped connector 127 as shown in Figure 10 and 11 ). In cases where the breathing circuit component includes a passage, the circuit end cap 150 can block the open end of the breathing circuit component to limit or prevent the entry of dust or contaminants when the component is not in use or not required to be connected to a patient. The circuit end cap 150 is configured to block the end of the breathing circuit component when the circuit end cap is in use, e.g., when the breathing circuit component is subsequently connected to the circuit end cap. When the breathing circuit component is inserted onto the circuit end cap 150, the cap structure blocks the opening of the breathing circuit component to prevent the entry of unwanted dust or other contaminants.

[0313] The circuit end cap 150 is configured to receive the breathing circuit components when the breathing circuit components are not required to be used in the breathing circuit assembly or not required to be connected to a patient. For example, the breathing circuit components can be connected and stored on the circuit end cap 150 during a ventilator leak test prior to treatment. Alternatively, when a particular breathing circuit component is not required at that time, the breathing circuit component can be temporarily stored on the circuit end cap 150 of the humidification chamber 104 during treatment. The breathing circuit components can also be stored on the circuit end cap 150 before or after treatment.

[0314] The breathing circuit components can also be placed on the circuit end cap 150 before or after the reprocessing cycle. The humidification chamber 104 can be disassembled and exposed to the cleaning fluid and elevated temperature and / or pressure during the reprocessing cycle, and the process can include using a washer disinfector and / or an autoclave.

[0315] As Figure 10 shown, in some configurations, the circuit end cap 150 is configured to support the Y-shaped connector 127 of the breathing circuit assembly. The circuit end cap 150 can be configured to receive the patient end of the Y-shaped connector 127. It should be understood that the circuit end cap 150 can be configured to receive other breathing circuit components of the breathing circuit assembly. When disassembled, the breathing circuit components connected to the circuit end cap 150 are typically the terminals of the circuit. For example, the end of the inspiratory conduit 122 can be stored on the circuit end cap 150. It should be understood that the provided circuit end cap 150 will have dimensions and geometries corresponding to the intended breathing circuit components it will receive. In some configurations, the circuit end cap 150 will have one or more sealing surfaces to fit a range of breathing circuit adapters or branches.

[0316] In the illustrated configuration, the circuit end cap 150 is integrally formed with the body 110 of the humidification chamber 104. In this way, the circuit end cap 150 is intended to be part of the humidification chamber 104 and is rigidly fixed to the humidification chamber such that it cannot be removed from the body 110. In some configurations, the circuit end cap 150 is integrally molded with the body 110 of the humidification chamber 104 during the manufacturing process.

[0317] In an alternative configuration, the circuit end cap 150 can be separate but associated with the humidification chamber 104 and optionally tethered to the humidification chamber in a manner similar to the water inlet plug 121.

[0318] As Figure 8 shown, in some configurations, the circuit end cap 150 is disposed outside and isolated from the cavity 112 of the humidification chamber 104. In these configurations, the circuit end cap 150 does not form a passage into the cavity 112. In this way, the circuit end cap 150 is fluidly isolated from the cavity 112, i.e., sealed and separated, such that gas does not flow out or escape from the cavity through the circuit end cap 150.

[0319] As Figure 5 and 6 best shown in, the circuit end cap 150 projects from the body 110 of the humidification chamber 104 in some configurations. The circuit end cap 150 can extend generally vertically from the top surface 118 of the body 110. In other configurations, the circuit end cap 150 can extend from the side wall of the body 110.

[0320] As Figure 11As shown, a sealed connection can be formed between the sealing surface of the circuit end cap 150 and the breathing circuit component.

[0321] In some configurations, the sealing surface of the circuit end cap 150 is located on the outer periphery 151 of the circuit end cap, and the outer periphery is configured to engage with the inner surface of the breathing circuit component.

[0322] In some configurations, the sealing surface may be sufficient for a ventilator leak test. In other configurations, the sealing surface is at least sufficient to securely receive the breathing circuit on the humidification chamber 104. The tight fit between these two wall surfaces can help to stabilize and fix the breathing circuit component to the humidification chamber 104. Optionally, the outer periphery 151 of the breathing circuit component and the inner surface 129 of the breathing circuit component may be tapered.

[0323] In some configurations, the circuit end cap 150 has a height sufficient to receive the breathing circuit component. In some configurations, the circuit end cap 150 is elongated and extends into the passage of the breathing circuit component to provide stable support for the component when not in use. It can be understood that when the circuit end cap 150 is capable of supporting the weight of the breathing circuit component and optionally the weight of the rest of the circuit that may act at that point, the circuit end cap provides appropriate stable support for the breathing circuit component. In some configurations, the circuit end cap 150 has a height of at least 5 mm. In some configurations, the circuit end cap 150 has a height between 11 mm and 16 mm.

[0324] As Figure 11 shown, in some configurations, the size and geometry of the circuit end cap 150 correspond to the internal geometry of the breathing circuit component. The breathing circuit components are connected, pressed, fixed, and / or placed on the circuit end cap 150 through a friction fit interaction. The interaction between the breathing circuit component and the circuit end cap 150 can be at least firm enough so as not to accidentally fall off the humidification chamber 104.

[0325] The circuit end cap 150 may have an external geometry corresponding to the internal geometry of the breathing circuit component. In some configurations, the circuit end cap 150 includes an outer diameter that is substantially the same as the inner diameter of the breathing circuit component it is configured to receive. In some configurations, the outer diameter of the circuit end cap 150 is slightly larger than the inner diameter of the breathing circuit component it is configured to receive. In other configurations, the outer diameter of the circuit end cap 150 is slightly smaller than the inner diameter of the breathing circuit component it is configured to receive. In some configurations, the circuit end cap 150 includes a taper, such as a taper with a diameter of 15 mm or 22 mm. In some configurations, the circuit end cap 150 includes a taper of 1:40.

[0326] In some configurations, as shown, the circuit end cap 150 includes a generally cylindrical shape. The generally cylindrical shape is designed to fit into a breathing circuit component (such as an end of the Y-connector 127) that the humidification chamber 104 is intended to support. Many of these breathing circuit components have a generally circular passage that will correspond to and fit onto the cylindrical circuit end cap 150.

[0327] In some configurations, the humidification chamber 104 may have markings, color coding, etc. to make it clear that the circuit end cap 150 is for receiving an end of a breathing circuit component. Other design features and methods (such as including information in an instruction manual) may be used to ensure that the user understands that the intended use of the circuit end cap 150 is for receiving a breathing circuit component.

[0328] As Figure 5 shown, the circuit end cap 150 may have a generally smooth outer perimeter 151. The smooth outer perimeter is configured to engage and seal against the inner wall 129 of a breathing circuit component.

[0329] In some configurations, for example Figure 14 and 15 shown, the circuit end cap 150 is hollow. In other configurations, for example Figure 16 shown, the circuit end cap is solid.

[0330] In some configurations, the circuit end cap 150 includes a generally flat top surface, as Figure 14 and 16 shown. In these configurations, the generally flat top surface can reduce the likelihood of dirt trapping on the upper surface of the humidification chamber 104.

[0331] In other configurations, the circuit end cap 150 includes a recessed top surface, as Figure 15 shown.

[0332] In yet another configuration, as Figure 12 shown, there is a humidification chamber 204 with a circuit end cap 150 that includes a ribbed top surface 153. As shown in the configuration shown, the ribbed top surface 153 may have a cross shape. In other configurations, the ribbed top surface 153 may have a Y shape or other suitable shape. In these configurations, the ribs extend into the breathing circuit component to provide support to the breathing circuit component. The ribbed configuration can advantageously provide a surface for draining liquid after reprocessing.

[0333] Referring to Figures 17 to 23, shows yet another configuration. In some configurations, the humidification chamber 404 has a chamfered edge portion 160. The chamfered edge portion 160 can be understood to refer to a part of the humidification chamber that has a recess or otherwise inwardly inclined walls to reduce the internal volume of the humidification chamber. An example of the profile of the chamfered edge portion 160 can be shown in the figures, however variations in the geometry of the chamfered edge portion can be expected. The chamfered edge portion 160 includes a curved portion, such as a concave curved portion. In some configurations, the chamfered edge portion 160 is located at or towards the edge of the humidification chamber 404. In some configurations, the chamfered edge portion 160 is at least partially located on the top surface of the humidification chamber 404. The chamfered edge portion 160 can extend between the top surface and the sidewall of the body 110. In some configurations, the humidification chamber 404 can have more than one chamfered edge portion 160. In some configurations, the humidification chamber 404 has a pair of chamfered edge portions 160. The pair of chamfered edge portions 160 can be located on opposite sides of the humidification chamber. Compared to a humidification chamber without a chamfered edge portion, the chamfered edge portion 160 can reduce the compressible volume in the humidification chamber 404. In these configurations, it should be understood that the volume of the humidification chamber 404 can be smaller than a humidification chamber without a chamfered portion while maintaining the overall dimensions of the humidification chamber (e.g., the height, width, diameter of the humidification chamber).

[0334] It should be understood that when the humidification chamber is tilted, the chamfered edge portion 160 can reduce the compressible volume of the humidification chamber 404 without affecting the water height inside the humidification chamber. The chamfered edge portion 160 results in a greater vertical separation between the top surface of a given volume of water in the humidification chamber and the bottom of the inlet port 113 and / or the outlet port 114. The height of the water remains the same as in a humidification chamber without a chamfered edge until the water level enters the outlet 114. This means that the benefit of reducing the compressible volume (via the chamfered edge portion 160) can improve the overflow performance relative to the outlet 114.

[0335] As Figure 17 shown and referenced, and as shown in a more close-up view, the humidification chamber can have a removal assist feature 170. The removal assist feature 170 is a cutout in the bottom edge of the humidification chamber. The removal assist 170 can be used to separate the body 110 of the humidification chamber from the base 111. The separation of these two components can be used, for example, for cleaning purposes.

[0336] The size and geometry of the removal aid feature 170 can be dimensioned sufficiently such that a human finger or tool can engage the body 110 and separate it from the base 111. In some configurations, the removal aid feature 170 can be a slot. The removal aid feature 170 (which is a smaller-sized cutout) can have advantages such as a reduced area to reduce the likelihood of trapping dust / undesirable contaminants. Additionally, a relatively small removal aid feature 170 can have strength advantages, such as the bottom edge of the humidification chamber remaining robust since only a small amount of material is removed for the removal aid feature.

[0337] In some configurations, as Figure 22 shown, the removal aid feature 170 is located on the lower edge of the body 110. In some configurations, the removal aid feature 170 extends from the bottom edge of the rim 171 towards the top edge of the rim 171. In some configurations, the removal aid feature 170 does not extend to the top edge of the rim 171 located on the bottom of the humidification chamber. It can be appreciated that a smooth surface is desirable where possible, such as maintaining a smooth top edge of the rim 171 on the bottom of the humidification chamber. In configurations where the humidification chamber is designed to be reused, for example, a smooth surface can facilitate reducing dirt trapping and / or being more effectively sterilized between uses. A smooth surface can also be advantageous as it provides a consistent and flat contact surface for the humidification chamber to engage with the humidifier to which it is attached, which can improve the ease and / or effectiveness of the connection. For example, when the humidification chamber is inserted between a spring-loaded heater base and a chamber track of a humidifier.

[0338] As Figures 23 to 24 shown, a separation tool 411 is shown for assisting in separating the body 110 of the humidification chamber from the base 111. The separation tool 411 is configured to engage the removal aid feature 170 of the humidification chamber to improve the ease of separating the body 110 of the humidification chamber from the base 111. The geometry and dimensions of the separation tool 411 are configured to correspond to the removal aid feature 170 of the humidification chamber. In some configurations, the separation tool 411 is substantially flat. In some configurations, the separation tool 411 has a flat bottom and an angled top surface region, as Figure 20 and 21 shown. In some configurations, the separation tool 411 has an angled region 412 that tapers towards one end for improved engagement with the removal aid 170 of the humidification chamber. The angled region 412 of the separation tool 411 can help wedge between the body 110 and base 111 components of the humidification chamber and separate them. The separation tool 411 also has a body region 413 that is thicker in some configurations than the angled region 412 of the separation tool. The angled top surface can improve the ease of insertion or engagement relative to the bottom of the body 110, such as improving engagement with the removal aid feature 170.

[0339] Once the separation tool 411 is engaged with the humidification chamber, rotation, lifting, or a similar action can be used to pry, lift, or otherwise separate the body 110 from the base 111 (e.g., as indicated by the arrows in Figure 24 ). The separation tool 411 can be used to pry apart and fully separate the two components, or in some configurations provide an initial separation of the components sufficient to make it easier for a person to separate the components by hand. In other configurations, the body 110 and the base 111 are separated by hand and no separation tool is used.

[0340] In some configurations, as shown in the exemplary illustration of Figure 5 , the circuit end cap 150 is located at or toward a central region on the top surface 118 of the body 110. In some configurations, the circuit end cap 150 is located in a region between the inlet 113 and the outlet 114 on the top surface 118 of the body 110. In these configurations, the circuit end cap 150 can be easily positioned. When the breathing circuit components are placed on the humidification chamber, the positioning of the circuit end cap 150 on the top surface 118 of the body 110 at the center of the body 110 and / or between the inlet 113 and the outlet 114 can also improve the stability of the humidification chamber.

[0341] In other configurations, the circuit end cap 150 is offset from the center on the top surface 118 of the body 110. In some configurations, for example, in the humidification chamber 204 shown in Figure 12 , the humidification chamber 304 shown in Figure 13 , and the humidification chamber 404 shown in Figure 17 , the circuit end cap 150 is closer to the edge rather than the central region on the top surface 118 of the body 110. In some configurations, for example, as shown in Figure 17 , the outlet 114 (the smaller opening shown) is spaced from the sidewall of the humidification chamber. In some configurations, the outlet 114 is positioned closer to the center (on the top surface of the humidification chamber) compared to the sidewall of the humidification chamber. In some configurations, the outlet 114 is positioned farther from the sidewall of the humidification chamber than the inlet 113. In some of these configurations, the position where the outlet 114 is spaced from the chamber wall can help increase the angle at which the humidification chamber 404 can tilt before water enters the outlet 114. In other configurations, as shown in Figure 5 , the inlet 113 and the outlet 114 are approximately the same distance from the sidewall. In other configurations (not shown), the inlet 113 is positioned farther from the sidewall of the humidification chamber than the outlet 114.

[0342] It should be understood that the described humidification chamber can be used and / or adapted to suit different patient needs. For example, the size of the humidification chamber can be designed for use by adults, children, or newborns. In configurations such as for neonatal applications, the volume of the humidification chamber can typically be smaller (e.g., a smaller aspect ratio). Additionally, features such as the beveled edge portion 160 for reducing the compressible volume can be particularly suitable for some uses, such as for neonatal applications, where a small compressible volume (and thus pneumatic compliance) can be useful, such that it can reduce the likelihood of conditions such as barotrauma.

[0343] As Figures 25 to 56 The humidification chamber and accessories shown below are described hereinafter. It should be understood that the following humidification chamber and accessories can be used at least in, for example, Figure 2 respiratory system 100, Figure 3 respiratory system 200.

[0344] Figure 25 Exemplary humidification chambers 104, 1140 and exemplary water feed device assemblies 302, 3020 are shown.

[0345] In some examples, the humidification chambers 104, 1140 can include a top 4040, sides (multiple sides) 4060, and a base 4080 (hidden). In some examples, as shown, the top 4040 and the base 4080 can each be substantially circular, and the sides 4060 can be substantially cylindrical or frustoconical. In some examples, the top 4040 and the sides 4060 can be formed by a hollow body 4100, and the base 4080 can be formed by a heat-conductive body 4120. The hollow body 4100 and the heat-conductive body 4120 can be sealingly attached to each other. The seal can be watertight and / or airtight. A seal (e.g., an O-ring, gasket, etc.) can be provided between the hollow body 4100 and the heat-conductive body 4120 to improve the seal. In some examples, the hollow body 4100 and the heat-conductive body 4120 can be permanently attached to each other, for example, by crimping, overmolding, or an adhesive. In other examples, the hollow body 4100 and the heat-conductive body 4120 can be configured to be repeatedly assembled and disassembled with each other.

[0346] The heat-conductive bodies 4120, 25020 (further shown in Figures 26 to 33 ) and, for example, the size and / or shape of the contact wall 25120 can be substantially similar to the heater plates 116, 33140, which can improve the heat conduction between the heat-conductive bodies 4120, 25020 and the heater plates 116, 33140. The shape of the heat-conductive bodies 4120, 25020 can be configured to reduce variations in the heat distribution and hot spots on the heat-conductive body during use. The shape of the heat-conductive bodies 4120, 25020 can be substantially similar to the shape of the heater plates 116, 33140.

[0347] The mass of the heat conductors 4120, 25020 can be less than about 100 grams (g), less than about 50 g, less than about 25 g, or about 23 g. The mass of the heat conductor 304 can be between about 10 g and 100 g, between about 15 g and 50 g, between about 20 g and 25 g, or about 23 g. In some examples, a mass of the heat conductors 4120, 25020 less than 25 g can improve the performance of the humidification chambers 104, 1140, 33020 in use.

[0348] The thickness of the heat conductors 4120, 25020, such as that which at least contacts the wall 25120, can be between about 0.2 mm and 1.2 mm, between about 0.2 mm and 1 mm, between about 0.4 mm and 0.9 mm, between about 0.6 mm and 0.8 mm, or about 0.7 mm. In one example, the thickness can be about 0.8 mm. In some examples, the thickness of the heat conductors 4120, 25020 can be between about 0.65 mm and 0.75 mm, such as about 0.70 mm.

[0349] The heat conductors 4120, 25020 can be formed of a metal or an alloy. The metal or alloy can include aluminum or stainless steel. The heat conductors 4120, 25020 can be formed of a metal or an alloy as a single piece. The heat conductors 4120, 25020 can be stamped from a sheet of the metal or alloy.

[0350] The thermal conductivity of the metal or alloy can be between about 12 watts per meter - kelvin (W / mK) and 286 W / mK, between about 88 W / mK and 251 W / mK, between about 170 W / mK and 230 W / mK, such as about 227 W / mK, or between about 190 W / mK and 210 W / mK.

[0351] The surface of the heat conductors 4120, 25020 can include a surface coating. In some examples, the heat conductors 4120, 25020 can be anodized.

[0352] The humidification chambers 104, 1140, 33020 can be configured to engage a breathing device, such as a humidifier 108, 33040. When assembled, the vertical distance between the upper surface of the hollow body flange and the lower side of the contact wall 25120 can be configured such that the humidification chambers 104, 1140, 33020 can be securely received and held by the breathing device. This distance can ensure consistent contact between the heater plates 116, 33140 and the contact wall 25120. In use, consistent contact between the heater plate and the contact wall can improve heat transfer between the heater plates 116, 33140 and the heat conductors 4120, 25020.

[0353] The humidification chambers 104, 1140, 33020 can be configured to be functionally equivalent to alternative humidification chambers. In particular, the reusable humidification chambers 104, 1140, 33020 can be configured such that when the humidification chambers 104, 1140, 33020 are retrofitted to the humidifiers 108, 33040 in place of alternative humidification chambers, one or more functions of the humidifiers 108, 33040 continue to operate properly (e.g., without error alarms). In some examples, one or more functions can continue to operate properly without adjusting the parameters or algorithms of the humidifier (e.g., when automatically detecting or manually selecting the appropriate mode of the humidification chamber). The humidification chambers 104, 1140, 33020 and the alternative humidification chambers can be structurally different. For example, an alternative humidification chamber can include a heat conducting body permanently attached (e.g., crimped) to a hollow body.

[0354] When compared to alternative humidification chambers with the same input conditions, the humidification chambers 104, 1140, 33020 can be configured to provide a similar level of humidity to the medical gas. The input conditions can include equal steady-state heater plate power, volume of water, input gas conditions (i.e., temperature and / or humidity), and ambient temperature. Matching one or more characteristics of the humidification chambers 104, 1140, 33020 and the alternative humidification chambers can reduce variations in humidity delivery.

[0355] In some examples, the humidification chambers 104, 1140, 33020 can be configured to have a heat capacity within about ±15%, within about ±10%, within about ±5%, or within about ±2.5% of the heat capacity of an alternative humidification chamber (e.g., a disposable humidification chamber) that can be used with the same humidifiers 108, 33040. In some examples, the heat conducting bodies 4120, 25020 of the humidification chambers 104, 1140, 33020 can be configured to have a heat capacity within about ±5 J / K, within about ±2 J / K, within about ±1 J / K, or within about ±0.5 J / K of the heat capacity of the heat conducting body of an alternative humidification chamber. In some examples, the heat conducting bodies 4120, 25020 of the humidification chambers 104, 1140, 33020 can be configured to have a heat capacity within about ±15%, within about ±10%, within about 5%, or within about 2.5% of the heat capacity of the heat conducting body of an alternative humidification chamber.

[0356] The heat capacity of the humidification chambers 104, 1140, 33020 can be the product of the mass and specific heat capacity of the humidification chambers 104, 1140, 33020. In some examples, the specific heat capacity of the heat conducting bodies 4120, 25020 can be between about 0.5 joules per gram kelvin (J / gK) and 1.5 J / gK, between about 0.7 J / gK and 1.1 J / gK, between about 0.8 J / gK and 1 J / gK, or about 0.9 J / gK.

[0357] The heat capacities of the humidification chambers 104, 1140, 33020 can depend to a large extent on the heat capacities of the heat conductors 4120, 25020. In some examples, the heat capacities of the heat conductors 4120, 25020 can be less than about 30 joules per kelvin (J / K), less than about 27 J / K, between about 16 J / K and 27 J / K, between about 19 J / K and 24 J / K, between about 20 J / K and 22 J / K, about 21 J / K, or between about 20.7 J / K and 21.2 J / K.

[0358] An alternative humidification chamber can be a disposable humidification chamber. The disposable humidification chamber can include a hollow body and a heat conductor that are non-separable (i.e., not intended to be removably and repeatedly attached to each other). For example, the heat conductor of the disposable humidification chamber can be crimped to the hollow body. The disposable humidification chamber can be obtained from Fisher & Paykel Healthcare Limited in Auckland, New Zealand as F&P TM MR325 TM chamber. The humidifiers 108, 33040 can be, for example, F&P also available from Fisher & Paykel Healthcare Limited TM 820 TM Heated humidifier. The parameter can be a specific model of the humidification chamber or the performance of the humidification chamber (such as heat capacity), or can be related to a specific model or performance of the humidification chamber. The function can be a low water or water shortage alarm. The algorithm can be a low water or water shortage detection algorithm. The water shortage detection algorithm can include detecting the response of the humidification chamber to a characteristic excitation signal.

[0359] The humidification chambers 104, 1140, 33020 can be constructed to be able to withstand at least 20 reprocessing cycles, such as at least 50 reprocessing cycles. In some examples, the reprocessing cycle can include placing the humidification chambers 104, 1140, 33020, for example in a disassembled configuration, in an autoclave. The autoclave can operate at a temperature of up to about 136 °C for a period of at least 4 minutes. In some examples, the reprocessing cycle can include chemical disinfection. In some examples, the humidification chambers 104, 1140, 33020 can be constructed to withstand autoclaving and chemical disinfection.

[0360] Reference Figures 26 to 33 Regarding the exemplary heat conductors 4120, 25020, the heat conductors 4120, 25020, such as the upright wall 25060, are attached to the surrounding member 25040. The surrounding member 25040 can partially or completely surround (e.g., encapsulate) the heat conductors 4120, 25020, such as the upright wall 25060. Reference Figures 26 to 27, perspective and top views of the heat conductors 4120, 25020 and the surrounding member 25040 are respectively provided.

[0361] For example, the heat conductors 4120, 25020 and the surrounding member 25040 can be used with the hollow bodies 4100 of the humidification chambers 104, 1140, 33020. The surrounding member 25040 can provide one or more similar features or functions similar to the heat conductor flange.

[0362] As described above, the heat conductors 4120, 25020 can include a contact wall 25080 and an upright wall 25060 extending from the contact wall 25080. In some examples, the heat conductors 4120, 25020 do not extend (e.g., in the radial direction) beyond the surrounding member 25040 and / or the upright wall 25060. In some examples, the heat conductors 4120, 25020 can include an upper protrusion array or a single upper protrusion, as described above. In some examples, the sealing element 27100 can be located near at least one of the heat conductors 4120, 25020 and the surrounding member 25040. Channels can be formed between the heat conductors 4120, 25020 and the surrounding member 25040.

[0363] The surrounding member 25040 can be formed in a step separate from the heat conductors 4120, 25020. The surrounding member 25040 can be connected to the heat conductors 4120, 25020, such as the upright wall 25060, by an interference fit, an adhesive, or overmolding, for example. The surrounding member 25040 can be permanently connected to the heat conductor, for example, not configured to be non-destructively separable.

[0364] The heat conductors 4120, 25020 can be formed of a metal or an alloy. The metal or alloy can be aluminum or stainless steel, such as 304 grade stainless steel.

[0365] The surrounding member 25040 can be formed of a material different from the heat conductors 4120, 25020. The surrounding member 25040 can be formed of a polymer. The polymer used for the surrounding member 25040 can be selected to withstand a reprocessing cycle or a predetermined minimum number of reprocessing cycles without deformation and / or degradation due to heat and / or chemicals. The polymer can include polypropylene. In some examples, the combination of the surrounding member 25040 and the heat conductors 4120, 25020 can be configured to withstand reprocessing as described above with respect to the humidification chambers 104, 1140, 33020. The surrounding member can have a relatively lower thermal conductivity than the heat conductor.

[0366] The surrounding member 25040 formed of a different material can provide a reduced contribution, for example, a negligible contribution, to the heat capacity of the humidification chambers 104, 1140, 33020.

[0367] The surrounding member 25040 can simplify the manufacture of the heat conductors 4120, 25020 and / or reduce the manufacturing cost.

[0368] In some examples, the heat conductors 4120, 25020 or at least the contact wall 25080 can have a uniform thickness. The thickness of the heat conductors 4120, 25020 or the contact wall 25080 can be between about 0.2 mm and 1.2 mm, between about 0.2 mm and 1 mm, between about 0.4 mm and 0.9 mm, between about 0.5 mm and 0.9 mm, or between about 0.6 mm and 0.8 mm, for example about 0.7 mm thick. In another example, the contact wall 25080 can be about 0.8 mm thick. The heat conductors 4120, 25020 can be formed from a sheet material, such as an aluminum alloy sheet. The heat conductors 4120, 25020 can be stamped. The heat conductors 4120, 25020 can be formed in a stamping machine.

[0369] Reference Figures 28 to 29 to the embodiment of Figure 27 provides cross-sectional views of the exemplary heat conductors 4120, 25020 through planes A-A and B-B as shown.

[0370] The heat conductors 4120, 25020 can have lips 27020. In cross-section, the lips 27020 can curve outward from the distal end of the upright wall 25060. The lips 27020 can form a single upper protrusion as described above. The lips 27020 can at least partially define a channel configured to receive a sealing element.

[0371] The surrounding member 25040 can be adjacent to the upright wall 25060. The surrounding member 25040 can form an annulus around the upright wall 25060.

[0372] A first portion 27040 of the surrounding member 25040 (such as the upper surface of the surrounding member 25040 in cross-section) can form a shoulder. When the humidification chambers 104, 1140, 33020 are assembled, the shoulder can at least partially hold the sealing element. The shoulder can at least partially define a channel configured to receive a sealing element. In some examples, the humidification chambers 104, 1140, 33020 can be configured to hold the sealing element between the shoulder and the lips 27020. In some examples, the first portion 27040 of the surrounding member 25040 and / or the lips 27020 of the heat conductors 4120, 25020 can include one or more retaining protrusions for the sealing element.

[0373] In some examples, a second portion 27060 of the surrounding member 25040 (such as the lower portion of the surrounding member 25040 in cross-section) can include a removal feature 25100, such as at least Figures 26 to 28As shown. The removal feature 25100 can be configured to assist in removing the hollow bodies of the humidification chambers 104, 1140, 33020 from the base (i.e., the surrounding member and the heat conducting bodies 4120, 25020). In various examples, the surrounding member 25040 can include one or more removal features. In the example shown, the surrounding member 25040 includes four removal features 25100.

[0374] The removal feature 25100 can include a stepped region (e.g., a downward stepped region) that provides a slot between the surrounding member 25040 and the hollow body (e.g., the hollow body flange) when the humidification chamber is in an assembled configuration.

[0375] In at least some examples, the humidification chamber can be disassembled at least in part by using an instrument (not shown) adapted to be inserted into the slot. The instrument can be manipulated (e.g., rotated and / or lifted) in the slot to pry the hollow body out of the surrounding member 25040 and the heat conducting bodies 4120, 25020 (or vice versa).

[0376] As Figure 29 shown, particularly Figure 32 as shown in detail C, the surrounding member 25040 (e.g., the second part 27060) can include the features described above for the heat conducting body flange in the foregoing examples. For example, the second part 27060 of the heat conducting body surrounding member 27040 can be configured to act as a stop for the hollow body flange during assembly of the humidification chambers 104, 1140, 33020.

[0377] Referring Figure 32 , the additional element 27080 can be at least partially located within the overmolding and can be configured to increase the adhesion between the overmolding and the heat conducting bodies 4120, 25020. The additional element 27080 can take the form of one or more wires welded to discrete locations on the upright wall 25060 of the heat conducting body for increasing the interaction with the first part 27040 of the overmolding.

[0378] Referring Figures 30 to 31 , a front view and a perspective view of the heat conducting bodies 4120, 25020 according to this example are provided.

[0379] Figure 32 is a detailed view of the heat conducting bodies 4120, 25020 according to the example as shown in detail C in Figure 29 .

[0380] In some examples, as Figure 32As best shown in [reference], the surrounding member 25040 can be substantially 'L'-shaped in cross-section. The second part 27060 can extend along a substantially outward direction (e.g., a radial direction). The first part 27040 can extend along a direction that is substantially perpendicular to the second part 27060 (e.g., an upward direction).

[0381] As Figure 28 best shown in [reference], at least a portion of the surrounding member 25040 (e.g., at least a portion of the second part 27060 intermediate the respective removal features 25100) can have a substantially uniform thickness. In some examples, the cross-section of the surrounding member 25040 can transition from a varying thickness in at least a portion of the first part 27040 to a generally uniform thickness in at least a portion of the second part 27060, as Figure 32 best shown in [reference]. In some examples, at least a portion of the second part 27060, such as away from the first part 27040, can have a thickness between about 2.5 mm and 3.5 mm, e.g., about 3 mm.

[0382] As Figure 32 best shown in [reference], at least a portion of the surrounding member 25040 (e.g., at least a portion of the second part 27060 at the removal feature 25100) can be at least partially tapered in thickness. For example, the second part 27060 can taper outwardly from adjacent the first part 27040. The second part 27060 can have a tapered section 31020 and a uniform section 31040. In some examples, as Figure 32 shown, the tapered section 31020 and the uniform section 31040 can each correspond to approximately half of the length of the second part 27060.

[0383] In some examples, as Figure 32 shown, the underside of at least a portion of the second part 27060, such as at the removal feature 25100, can be concave.

[0384] The height of the removal feature 25100 can be expressed as the distance between the surrounding member 25040 (e.g., the second part 27060) and the hollow body flange at the removal feature 25100 when the humidification chambers 104, 1140, 33020 have been assembled. In some examples, the height of the removal feature, i.e., the height of the slot, can be between about 1 mm and 3 mm, e.g., about 2 mm.

[0385] The width of the removal feature 25100 can be expressed with reference to the chord length of the second part 27060 away from the first part 27040. In some examples, the width of the removal feature 25100 can be at least about 5 mm, between about 5 mm and 100 mm, between about 5 mm and 50 mm, between about 5 mm and 30 mm, between about 10 mm and 25 mm, or between about 15 mm and 20 mm, such as about 16 mm. In some examples, the humidification chamber can have a single continuous removal feature that extends substantially or entirely around the perimeter of the humidification chamber. In some examples, the width of the removal feature 25100 can be between about 10 mm and 22 mm, or between about 13 mm and 19 mm, such as about 16 mm. In some examples, the width of the removal feature can be between about 10 mm and 20 mm, or between about 12 mm and 16 mm, such as about 14 mm.

[0386] In some examples having more than one removal feature 25100, each removal feature 25100 can have the same geometry. In some examples, each removal feature 25100 can be equally spaced around the perimeter of the surrounding member 25040. In some examples, the removal feature pairs 25100 can be diametrically opposed.

[0387] The removal feature 25100 (e.g., the stepped region) provided in the surrounding member 25040 can preferably be a removal feature provided in a hollow body (e.g., a hollow body flange). In some examples, the removal feature 25100 provided in the surrounding member 25040 can enable the engagement of the humidification chambers 104, 1140, 33020 with the humidifier to be independent of the rotational orientation of the humidification chambers 104, 1140, 33020 relative to the vertical axis. In some examples, the removal feature (e.g., the stepped region) in the hollow body flange can inhibit the engagement of the humidification chamber with at least some humidifiers and / or in some orientations.

[0388] Figure 33 is a bottom view of the heat conductors 4120, 25020, and the surrounding member 25040.

[0389] During the installation of the breathing device, the humidification chamber can be installed onto the humidifier base unit. The installation process can include pressing down on the components of the humidifiers 108, 33040, and moving the humidification chambers 104, 1140, 33020 in the direction to be received by the humidifiers 108, 33040.

[0390] Figure 34Is a perspective view of exemplary humidification chambers 104, 1140, 33020 when they are installed to the base units of humidifiers 108, 33040. Except for the differences described below, the humidification chambers 104, 1140, 33020 according to this example can be similar to the humidification chambers 104, 1140, 33020, and the description as above is also intended to apply to the humidification chambers 104, 1140, 33020.

[0391] The exemplary humidification chambers 104, 1140, 33020 can include a hollow body 4100 of the humidification chambers 104, 1140, 33020. The bases of the humidification chambers 104, 1140, 33020 can include a combination of a heat conducting body 4120, 25020 and a surrounding member 25040.

[0392] The humidifiers 108, 33040 can be F&P TM 820 TM heated humidifiers.

[0393] The humidifiers 108, 33040 can have a guard 33060. The guard 33060 can first be pressed down by the user in the direction shown by the arrow 33080. Pressing down the guard 33060 can expose a shoulder 33100 in the humidifiers 108, 33040, which can be configured to receive a hollow body flange and / or the surrounding member of the humidification chambers 104, 1140, 33020. The humidification chambers 104, 1140, 33020 can be moved in the direction indicated by the arrow 33120 (e.g., horizontal direction) to be received by the humidifiers 108, 33040. The engagement of the hollow body flange and / or the surrounding member with the shoulder 3310 can brace the humidification chamber 33020 against the upward force of the upwardly biased (e.g., spring-loaded) heater plate 33140 from the humidifiers 108, 33040. After removing the downward pressure and installing the humidification chambers 104, 1140, 33020, the guard 33060 can elastically return to the guarding position.

[0394] Figure 35 Is a perspective view of the humidification chambers 104, 1140, 33020 installed on the humidifiers 108, 33040.

[0395] As Figure 35 shown, in the case where the humidification chambers 104, 1140, 33020 are installed to the humidifiers 108, 33040, the guard 33060 in the guarding position can be configured to prevent fingers from approaching the heater plate 33140 that may get hot during use, and / or prevent the inadvertent removal of the humidification chambers 104, 1140, 33020 from the humidifiers 108, 33040.

[0396] The humidification chambers 104, 1140, 33020 may have gas inlets 113, 1180. The gas inlets 113, 1180 may be configured to be pneumatically coupled to a humidifier supply tube 120. The gas inlet 113 may receive pressurized breathing gas from a flow generator 105. The gas inlets 113, 1180 may be integrally formed in the humidification chambers 104, 1140, 33020. The gas inlets 113, 1800 may be provided in a hollow body 4100, such as in a top portion 4040 as shown. In other examples, the gas inlets 113, 1180 may be located on a side portion 4060 of the humidification chambers 104, 1140, 33020 (such as the hollow body 4100). The gas inlets 113, 1180 may be offset from the center of the humidification chambers 104, 1140, 33020 (such as the top portion 4040). As shown, the gas inlets 113, 1180 may be provided at or near a perimeter of the humidification chambers 104, 1140, 33020 (such as the top portion 4040). The gas inlets 113, 1180 may be substantially cylindrical or frustoconical in shape. The gas inlets 113, 1180 may have a substantially vertical axis. The gas inlets 113, 1180 may project outward (such as upward) from the humidification chambers 104, 1140, 33020 (such as the top portion 4040). The gas inlets 113, 1180 may extend substantially perpendicularly from the top portion 4040. In other examples, the gas inlets 113, 1180 may extend from the humidification chambers at an angle other than 90°.

[0397] The humidification chambers 104, 1140, 33020 (e.g., the gas inlets 113, 1180) may include baffles (not shown). The baffles may be configured to redirect the pressurized breathing gas. Redirecting the incoming breathing gas may improve the circulation and / or residence time of the breathing gas within the humidification chambers 104, 1140, 33020. It may also reduce perturbations, such as turbulence, at the surface of a volume of water contained within the humidification chambers 104, 1140, 33020.

[0398] The humidification chambers 104, 1140, 33020 may have gas outlets 114, 1200. The gas outlets 114, 1200 may be configured to be pneumatically coupled to an inspiratory tube for delivering humidified breathing gas to a patient via a patient interface. The gas outlets 114, 1200 may be integrally formed in the humidification chambers 104, 1140, 33020. The gas outlets 114, 1200 may be disposed in a hollow body 4100, such as the top 4040 as shown. In other examples, the gas outlets 114, 1200 may be located on a side 4060 of the humidification chambers 104, 1140, 33020 (such as the hollow body 4100). The gas outlets 114, 1200 may be located at the center of the humidification chambers 104, 1140, 33020 (such as the top 4040). In other examples, the gas outlets 114, 1200 may be offset from the center of the humidification chambers 104, 1140, 33020, such as being disposed at or near an outer perimeter of the top 4040. The gas outlets 114, 1200 may be substantially cylindrical or frustoconical. The gas outlets 114, 1200 may have a substantially vertical axis. The gas inlets 113, 1180 may project outwardly (such as upwardly) from the humidification chambers 104, 1140, 33020 (such as the top 4040). The gas outlets 114, 1200 may extend substantially perpendicularly from the top 4040. In other examples, the gas outlets 114, 1200 may extend from the humidification chamber at an angle other than 90°.

[0399] In some examples, the axes of the gas inlets 113, 1180 and the gas outlets 114, 1200 may be substantially parallel to each other. The gas inlets 113, 1180 and the gas outlets 114, 1200 may project the same distance from the humidification chambers 104, 1140, 33020. The gas inlets 113, 1180 may be wider than the gas outlets 114, 1200 (such as having a larger inner diameter and / or outer diameter).

[0400] The humidification chambers 104, 1140, 33020 are configured to hold a volume of liquid, such as water. The humidification chambers 104, 1140, 33020 may have an inlet port 4020 through which the liquid may be provided into the interior of the humidification chambers 104, 1140, 33020. The inlet port 4020 may be configured to be fluidly coupled to a water feed device assembly 302, 3020. The inlet port 4020 may be integrally formed in the humidification chambers 104, 1140, 33020. The inlet port 4020 may be disposed in a hollow body 4100, such as the top 4040 as shown. In other examples, the inlet port 4020 may be positioned on a side 4060 of the humidification chambers 104, 1140, 33020. The inlet port 4020 may extend substantially vertically from the top 4040. In other examples, the inlet port 4020 may extend from the humidification chamber at an angle other than 90°. The inlet port 4020 may be offset from the center of the top 4040, such as being disposed at or near the outer perimeter of the top 4040. The gas outlets 114, 1200 may be substantially cylindrical or frustoconical. The gas outlets 114, 1200 may have a substantially vertical axis. The axes of at least one, preferably both, of the gas inlets 113, 1180 and the gas outlets 114, 1200 and the axis of the inlet port 4020 may be substantially parallel to each other. The inlet port 4020 may project outward (e.g., upward) from the humidification chambers 104, 1140, 33020 (such as the top 4040). The inlet port 4020 may project less than at least one, preferably both, of the gas inlets 113, 1180 and the gas outlets 114, 1200. The inlet port 4020 may project about half of the distance that at least one, preferably both, of the gas inlets 113, 1180 and the gas outlets 114, 1200 project or project less than about half of that distance. The inlet port 4020 may be narrower (e.g., having a smaller inner diameter and / or outer diameter) than at least one, preferably both, of the gas inlets 113, 1180 and the gas outlets 114, 1200.

[0401] The water feed device assemblies 302, 3020 may include water feed device connectors 305, 3040, liquid conduits 306, 3060, and water source connectors 308, 3080 (such as spikes).

[0402] Figure 36 A detailed exploded view of an exemplary inlet port 4020 of the humidification chambers 104, 1140, 33020 and exemplary feed device connectors 305, 3040 of the water feed device assembly is provided.

[0403] The inlet port 4020 may have a sidewall 5020 that partially defines a humidification chamber bore 5040 within the inlet port 4020. The sidewall 5020 may correspond to the portion of the inlet port 4020 that extends outwardly from the humidification chambers 104, 1140, 33020 (e.g., the top 4040). When viewed along the axis of the inlet port 4020, the sidewall 5020 may have a circular (e.g., annular) shape.

[0404] The humidification chamber bore 5040 may extend completely through the inlet port 4020 from an inlet end external to the humidification chambers 104, 1140, 33020 to an outlet end 5060 internal to the humidification chambers 104, 1140, 33020. The humidification chamber bore 5040 may provide a passageway through which liquid can be delivered to the interior of the humidification chamber via the water feed device assemblies 302, 3020. The humidification chamber bore 5040 may have a circular cross-section. The cross-section of the humidification chamber bore 5040 may vary along at least a portion of its length, e.g., have a variable diameter. In some examples, the cross-section of the humidification chamber bore 5040 may vary continuously along its entire length, e.g., have a variable diameter. In other examples, the humidification chamber bore 5040 may have a uniform cross-section, e.g., a constant diameter, along at least a portion of its length.

[0405] Reference is made below to Figures 36 to 40 describe the inlet port 4020 in further detail.

[0406] Continuing to refer to Figure 36 , the feed device connectors 305, 3040 may have a connector body 5080 having a proximal end 5100 (e.g., close to the liquid conduits 306, 3060 in use) and a distal end 5120 (e.g., away from the liquid conduits 306, 3060 in use). The connector body 5080 may have a connector bore 5140 extending therethrough. The connector bore 5140 may extend from the proximal end 5100 to the distal end 5120. The connector bore 5140 may have a circular cross-section. The connector bore 5140 may have a uniform cross-section, e.g., a constant diameter, along at least a portion of its length. In some examples, the connector bore 5140 may have a uniform cross-section, e.g., a constant diameter, along its entire length. In other examples, the cross-section of the connector bore 5140 may vary along at least a portion of its length, e.g., have a variable diameter.

[0407] The feed device connectors 305, 3040 may be configured to be fluidly coupled to the liquid conduits 306, 3060 at or around the proximal end 5100. The feed device connectors 305, 3040 may be configured to be fluidly coupled to the inlet port 4020 at or around the distal end 5120. The feed device connectors 305, 3040 and the inlet port 4020 may be connected by an interference fit (e.g., a friction fit).

[0408] Reference is made below to Figures 42 to 48 describe the feed device connectors 305, 3040 in further detail.

[0409] Inlet port

[0410] Figure 37 A longitudinal section through the inlet port 4020 of the humidification chambers 104, 1140, 33020 is shown.

[0411] The inlet port 4020 of the humidification chamber may include a sidewall 5020. The sidewall 5020 may define a first portion 6020 of the humidification chamber aperture 5040 within the inlet port 4020. The sidewall 5020 and / or the first portion 6020 may correspond to a portion of the inlet port 4020 that extends outwardly from the humidification chambers 104, 1140, 33020 (e.g., the top 4040).

[0412] The sidewall 5020 may have an inner surface 6040 and an outer surface 6060. The sidewall 5020 may have a thickness t between the inner surface 6040 and the outer surface 6060 in a direction perpendicular to the axis 6080 of the inlet port 4020. The thickness t may vary along at least a portion of the longitudinal length of the sidewall 5020. In some examples, the thickness t may vary continuously along the entire longitudinal length of the sidewall 5020. In the example shown, the thickness t of the sidewall 5020 continuously increases from the inlet end 5160 of the inlet port 4020 toward the outlet end 5060 of the inlet port 4020. The thickness t of the sidewall 5020 may be substantially uniform in the circumferential direction about the axis 6080, e.g., at any given location along the length of the axis 6080. In some examples, the sidewall 5020 and / or the inlet port 4020 may have rotational symmetry about the axis 6080.

[0413] In some examples, the outlet end 5060 of the inlet port 4020 may be flush with the inner surface of the humidification chambers 104, 1140, 33020 (e.g., the top 4040). In other examples, the outlet end 5060 of the inlet port 4020 may protrude from the inner surface of the humidification chambers 104, 1140, 33020 (e.g., the top 4040).

[0414] The first portion 6020 of the humidification chamber aperture 5040 (and / or the inner surface 6040 of the sidewall 5020) may taper at least partially inwardly from the inlet end 5160 of the inlet port 4020 toward the outlet end 5060. That is, the diameter of the first portion 6020 may decrease along the direction of the expected fluid flow. In some examples, the first portion 6020 of the humidification chamber aperture 5040 may taper at a constant rate between about 4% and 8%, or between about 5% and 7%, e.g., at a rate of about 6%.

[0415] The taper may affect the stability of the connection between the feed device connectors 305, 3040 and the inlet port 4020. If the first part 6020 of the humidification chamber aperture 5040 tapers too steeply, it may result in an ineffective connection because the feed device connectors and the inlet port may engage too loosely. This may increase the risk of an undesired disconnection. In some examples, the inner surface 6040 of the sidewall 5020 and the feed device connectors 305, 3040 may require a minimum holding force between about 40 Newtons (N) and 50 N, such as about 45 N, to provide an effective connection. It has been found that a taper of about 6% creates sufficient friction and holding force between the feed device connectors 305, 3040 and the inlet port 4020 to provide an effective connection.

[0416] The outer surface 6060 of the sidewall 5020 may diverge from the inlet end 5160 of the inlet port 4020 towards the outlet end 5060. That is, the outer surface 6060 may taper towards the inlet end 5160. The inlet port 4020 may thus have a hollow frustoconical shape. The diverging / tapering outer surface 6060 of the sidewall 5020 may improve the manufacturability of the humidification chambers 104, 1140, 33020 during molding. In some examples, the outer surface 6060 may taper at a constant rate of at least partially between about 0.25% and 5%, or between about 0.5% and 3%, such as at about 0.5% or 1%. In other examples, the outer surface 6060 of the sidewall 5020 may not diverge / taper at all. That is, the inlet port 4020 may alternatively have a hollow cylindrical shape.

[0417] A fillet 6100 may be provided at the transition between the sidewall 5020 of the inlet port 4020 and the top 4040 of the humidification chambers 104, 1140, 33020. The fillet may improve the manufacturability of the humidification chambers 104, 1140, 33020 during molding.

[0418] The first part 6020 of the humidification chamber aperture 5040 may have a height of between about 8 mm and 9 mm, such as about 8.5 mm, in the direction of the axis 6080.

[0419] Within the first part 6020 of the humidification chamber aperture 5040, the feed device connectors 305, 3040 are inserted in use to engage with the inlet port 4020. The height of the first part 6020 of the humidification chamber aperture 5040 preferably allows a sufficient portion of the feed device connectors 305, 3040 to be inserted into the inlet port 4020 to provide a secure connection.

[0420] The diameter of the first portion 6020 of the humidification chamber aperture 5040 can vary along an axis 6080. This variable diameter can be due to a taper of the humidification chamber aperture 5040. In some examples, the minimum diameter of the first portion 6020 of the humidification chamber aperture 5040 can be between about 6.7 mm and 6.9 mm, such as about 6.7 mm or 6.8 mm. The maximum diameter of the first portion 6020 can be between about 7.2 mm and 7.4 mm, such as about 7.3 mm. The diameter of the first portion 6020 of the humidification chamber aperture 5040 can taper at between about 0.3 mm and 0.7 mm, such as about 0.5 mm or 0.6 mm. In some examples, as shown, the minimum diameter of the first portion 6020 of the humidification chamber aperture 5040 can be at its inner end, such as adjacent to the second portion 6120. Moreover, the maximum diameter of the first portion 6020 of the humidification chamber aperture 5040 can be located at the inlet end 5160 of the inlet port 4020.

[0421] In the past, among many other applications, Luer connections may have been used to establish a connection between a liquid conduit and a humidification chamber. Luer connections are inexpensive, familiar, effective, and easy to use. However, it has been found that the widespread use and interconnectivity of Luer connections may present an increased risk of misconnection of the liquid conduit and / or the humidification chamber. For example, a liquid conduit may inadvertently be connected to a medical device or accessory other than the humidification chamber. Or, a medical device or accessory other than the liquid conduit may inadvertently be connected to the humidification chamber.

[0422] The safety of a patient receiving respiratory assistance can be improved by a humidification chamber 104, 1140, 33020 having an inlet port 4020, which reduces the risk of misconnection with medical devices, accessories, or connectors, including ISO-compliant connectors (defined in the following glossary) and / or Luer connectors.

[0423] In some examples, the inlet port 4020 can be incompatible with all ISO-compliant connectors. In other examples, the inlet port 4020 can be incompatible with a subset of ISO-compliant connectors (e.g., any one or more from parts 3, 5, 6, and 7). If a connector is configured such that it does not make a secure connection in normal use, the inlet port 4020 may be incompatible with that connector.

[0424] The inlet port 4020 of the present disclosure can have dimensions selected to reduce the risk of misconnection of an ISO-compliant connector with the inlet port 4020.

[0425] ISO-compliant connectors can have a range of different widths or diameters. The diameter of the humidification chamber aperture 5040 at the inlet end 5160 of the inlet port 4020 can be selected to inhibit successful engagement of an ISO-compliant connector having a greater width or diameter with the inlet port 4020. Such an ISO-compliant connector may collide with the sidewall 5020 of the inlet port 4020 and not be able to fit within the humidification chamber aperture 5040. Some narrower ISO-compliant connectors may have barbs that extend outward. The diameter of the first portion 6020 of the humidification chamber aperture 504 can be selected to be large enough such that such an ISO-compliant connector cannot be secured against the sidewall 5020 within the inlet port 4020.

[0426] A shoulder 6140 can extend inwardly from the sidewall 5020. The shoulder 6140 can be located downstream of the sidewall 5020. The shoulder 6140 can define a second portion 6120 of the humidification chamber aperture 5040. The cross-sectional area of the humidification chamber aperture 5040 can be constricted by the shoulder 6140.

[0427] In some examples, as Figure 37 shown, the shoulder 6140 can have a concave edge shape. The shoulder 6140 can have an upstream surface 6160. In some examples, as Figure 37 shown, the upstream surface 6160 of the shoulder 6140 can be a concave surface. The upstream surface 6160 of the shoulder 6140 can form a funnel-shaped portion within the humidification chamber aperture 5040. The upstream surface 6160 can relatively suddenly constrict the cross-sectional area of the humidification chamber aperture 5040. In some examples, as Figure 37 shown, the upstream surface 6160 can be inclined relative to the axis 6080. In other examples, the upstream surface 6160 can be substantially planar and / or extend radially relative to the axis 6080.

[0428] In at least this region of the upstream surface 6160 of the shoulder 6140, the inlet port 4020, the shoulder 6140, and / or the second portion 6120 of the humidification chamber aperture 5040 can have a variable taper. In other examples, the inlet port 4020, the shoulder 6140, and / or the second portion 6120 can have a constant taper in this region.

[0429] In some examples, as Figure 37 shown, the height of the shoulder 6140 in the direction of the axis 6080 of the humidification chamber aperture 5040 can vary. In other examples, the height of the shoulder 6140 can be constant. In some examples, as Figure 37As shown, the maximum height of the shoulder 6140 and / or the height of the second portion 6120 may correspond to the thickness of the top 4040 of the humidification chamber 104, 1140, 33020. In other examples, the maximum height of the shoulder 6140 and / or the height of the second portion 6120 may be different from the thickness of the top 4040 of the humidification chamber 104, 1140, 33020. In some examples, the shoulder 6140 may be disposed in the same plane as the top 4040. In other examples, the shoulder 6140 may be offset from the top 4040 in the direction of the axis 6080.

[0430] The shoulder 6140 may include an upstream portion 6180 and a downstream portion 6200. The upstream portion of the shoulder 6140 may provide a steep or gradual (e.g., tapered) transition from the first portion 6020 of the inlet port 4020 to the downstream portion 6200 of the second portion 6120 of the inlet port 4020. The downstream portion 6200 of the shoulder 6140 may extend perpendicular to the axis 6080 of the humidification chamber bore 5040. The downstream portion 6200 may define the minimum diameter of the second portion 6120 and / or the humidification chamber bore 5040. The downstream portion 6200 may define a nozzle 6220 within the humidification chamber bore 5040, e.g., at the outlet end 5060.

[0431] In some examples, the diameter of the second portion 6120 of the humidification chamber bore 5040 at the transition between the upstream surface 6160 and the edge 6240 may be no greater than 3.3 mm, e.g., about 3.2 mm. The diameter of the humidification chamber bore 5040 at the upstream end adjacent the upstream portion 6180 of the downstream portion 6200 of the shoulder 6140 may be between about 41% and 46%, preferably about 44%, of the diameter of the humidification chamber bore 5040 at the inlet end 5160 of the inlet port 4020. This narrowing of the humidification chamber bore 5040 at the shoulder 6140 inhibits connection with an ISO-compliant connector having a smaller width or diameter without barbs. For example, such a feed device connector would be blocked at the shoulder 6140, preventing or inhibiting entry into the interior of the humidification chamber 104, 1140, 33020 through the inlet port 4020.

[0432] In at least some examples, one or more, preferably both, of the inner surface 6040 and the outer surface 6060 of the sidewall 5020 do not have threads. In some examples, the inlet port 4020 does not have threads.

[0433] Compared to alternative feed device connectors such as female fittings having a threaded configuration, the inwardly extending shoulder 6140 may simplify manufacturing. Fittings having a threaded configuration may also increase the risk of undesirable particle accumulation and entrapment within the inlet port during use.

[0434] The edge 6240 of the shoulder 6140 and thus the humidification chamber aperture 5040 can taper from the upstream end of the downstream portion 6200 adjacent to the upstream portion 6180 towards the outlet end 5060 of the inlet port 4020. In some examples, the edge 6240 can taper at a constant rate between about 0.8% and 5.3%, or between about 2% and 4%, such as at a rate of about 3.5%. This tapering can improve the formability of the inlet port 4020 during the manufacture of the humidification chambers 104, 1140, 33020. In other examples, the edge 6240 of the shoulder and the base portion can be completely non-tapering.

[0435] As Figure 38 shown, when viewed along the axis 6080, such as from directly above, the shoulder 6140 can be annular.

[0436] As Figure 39 shown, a fillet 8020 can be provided at the transition between the sidewall 5020 and the shoulder 6140. The fillet 8020 and / or the non-linear bevel of the upper upstream surface 6160 of the shoulder 6140 can reduce the risk of undesirable particle accumulation and entrapment within the inlet port 4020 during use. The fillet 8020 and / or the upstream surface 6160 can allow liquids and other particles traveling through the feed device connectors 305, 3040 to be conveyed into the humidification chambers 104, 1140, 33020 and reduce the chance of these particles being trapped in the constricted region of the inlet port 4020.

[0437] Figure 40 Another example of the inlet port 4020 according to the present disclosure is shown. Except as described below or apparent from the drawings, Figure 40 the inlet port 4020 can be similar to Figures 36 to 39 the inlet port 4020. The above details and variations are intended to apply equally to this example and vice versa.

[0438] In Figure 40 the exemplary inlet port 4020, the minimum diameter of the humidification chamber aperture 5040 at the first portion 6020 can be greater than the maximum diameter of the humidification chamber aperture 5040 at the second portion 6120. In some examples, it can be at least 100%, at least 110% or at least 120% greater. The shoulder 6140 can provide a sudden transition between the first portion 6020 and the second portion 6120. The shoulder 6140 can provide a sudden constriction of the humidification chamber aperture 5040. The upstream surface 6160 of the shoulder 6140 can be planar. The upstream surface can be perpendicular to the axis 6080. The height of the shoulder 6140 in the direction of the axis 6080 can be substantially uniform. The height of the shoulder 6140 can be greater than the thickness of the top 4040.

[0439] Figure 41 Another example of the inlet port 4020 according to the present disclosure is shown. Except as described below or apparent from the drawings, Figure 40 the inlet port 4020 of Figures 36 to 40 may be similar to the inlet port 4020 of

[0440] As shown, in some examples, the inlet port 4020 may include a plurality of shoulders 6140 extending inwardly from the sidewall 5020. In the example shown, there are four shoulders 6140. In other examples, there may be two, three, five or more shoulders. The plurality of shoulders 6140 may be circumferentially spaced apart from each other, for example. The shoulders 6140 may be equally spaced apart.

[0441] Each of the plurality of shoulders 6140 may be similar or different in shape. As shown, the shoulders 6140 may be partially annular.

[0442] In other examples, the inlet port 4020 may include a plurality of sidewalls arranged in a non-annular shape. For example, the inlet port 4020 may have four sidewalls arranged in a rectangular shape.

[0443] Feed device connector

[0444] Figure 42 is shown in more detail Figure 36 exemplary feed device connectors 305, 3040 of

[0445] The feed device connectors 305, 3040 are configured to be inserted into the inlet port 4020. The feed device connectors 305, 3040 may include a connector body 5080. The connector body 5080 may have a proximal end 5100 and a distal end 5120. A connector hole 5140 may extend through the connector body 5080 between the proximal end 5100 and the distal end 5120. When viewed along the axis of the feed device connectors 305, 3040, the connector hole 5140 may have a circular shape. The diameter or width of the connector hole 5140 may be substantially uniform along the length of the axis of the feed device connectors 305, 3040. The connector hole 5140 may be generally cylindrical. In other examples, the width or diameter of the connector hole 5140 may at least partially taper in a direction from the proximal end 5100 to the distal end 5120, or vice versa.

[0446] The connector body 5080 of the feed device connectors 305, 3040 may have a proximal portion 11020 and a distal portion 11040.

[0447] The proximal portions 11020 of the feed device connectors 305, 3040 may be configured to fluidly couple with liquid conduits 306, 3060 (see Figure 36 ). The liquid conduits 306, 3060 may in turn be configured to fluidly couple with a water source (e.g., a sterile water bag (not shown)). Opposite ends of the liquid conduits 306, 3060 may be provided with water source connectors 308, 3080, such as spikes configured to pierce the water bag as described above.

[0448] The distal portions 11040 of the feed device connectors 305, 3040 may be configured to fluidly couple with an inlet port 4020.

[0449] At least a portion of the proximal portion 11020 may be configured to be inserted into the liquid conduits 306, 3060 (see Figure 25 ). The proximal portion 11020 may be configured to be received by the liquid conduits 306, 3060 by an interference fit (e.g., a friction fit). The proximal portion 11020 may have a hollow frustoconical shape. The proximal portions 11020 of the feed device connectors 305, 3040 may taper towards the proximal ends 5100 of the feed device connectors 305, 3040. The taper may be or include a constant taper rate. The proximal portions 11020 of the feed device connectors 305, 3040 may taper at a rate between about 0.8% and 5.3%, or between about 2% and 4%, such as at a rate of about 3.5%. The feed device connectors 305, 3040 may have an outer diameter or width at the proximal ends 5100 between about 4 mm and 5 mm, such as about 4.7 mm. This may maximize the surface area at the contact portion between the proximal portions 11020 of the feed device connectors 305, 3040 and the liquid conduits 306, 3060.

[0450] At least a portion of the distal portion 11040 may be configured to be inserted into the humidification chamber aperture 5040 of the inlet port 4020 in use. The distal portion 11040 may be configured to be received by the inlet port 4020 with an interference fit (e.g., a friction fit). The distal portion 11040 may have a hollow frustoconical shape. The distal portion 11040 of the feed device connectors 305, 3040 may taper towards the distal end 5120 of the feed device connectors 305, 3040. The taper may be or include a constant taper rate. The distal portion 11040 of the feed device connectors 305, 3040 may taper at a rate between about 4% and 8%, or between about 5% and 7%, such as at a rate of about 6%. The distal portion 11040 of the feed device connectors 305, 3040 preferably tapers at substantially the same rate as the first portion 6020 of the humidification chamber aperture 5040. The feed device connectors 305, 3040 may have an outer diameter or width at the distal end 5120 between about 6 mm and 8 mm, such as about 7 mm. This may maximize the surface area at the contact between the distal portion 11040 of the feed device connectors 305, 3040 and the sidewall 5020 of the inlet port 4020. This extended contact may provide a high enough frictional force between the two components to establish a secure connection by a friction fit. A high frictional force (e.g., about 45 N) between the feed device connector and the inlet port may mitigate leakage between the two components.

[0451] The feed device connectors 305, 3040 may include a flange 11060 extending outwardly from the connector body. The flange 11060 may extend substantially perpendicular to the axis of the feed device connectors 305, 3040. The flange 11060 may be located intermediate the proximal portion 11020 and the distal portion 11040. The flange 11060 may be configured to be grasped by a user when connecting and / or disconnecting the feed device connectors 305, 3040 to / from the inlet port 4020 and / or the liquid conduits 306, 3060. In some examples, the flange 11060 may serve as a stop when the feed device connectors 305, 3040 are inserted into the inlet port 4020 and / or the liquid conduits 306, 3060. The flange 11060 may be configured to be axially spaced from the inlet port 4020 when the feed device connectors 305, 3040 are inserted into the inlet port 4020. The shape of the flange 11060 may be substantially circular or annular.

[0452] The flange 11060 may also extend toward the proximal end 5100 to define a circumferential channel 11080 around a portion of the proximal portion 11020. The circumferential channel 11080 may be configured to receive the ends of the liquid conduits 306, 3060. The flange 11060 may be configured to frictionally engage the ends of the liquid conduits 306, 3060. The circumferential channel 11080 may assist in sealing and / or retention between the feed device connectors 305, 3040 and the liquid conduits 306, 3060.

[0453] The feed device connectors 305, 3040 may include one or more tabs 11100. The feed device connectors 305, 3040 may include a pair of tabs 11100. The tabs 11100 may be equidistantly positioned around the circumference of the flange 11060, for example, a pair of tabs 11100 may be diametrically opposed. The tabs 11100 may extend perpendicular to the axis of the feed device connectors 305, 3040. The tabs 11100 may extend radially from the flange 11060. The tabs 11100 may be semi-circular or crescent-shaped. The tabs 11100 may be configured to be grasped by a user when connecting and / or disconnecting the feed device connectors 305, 3040 to and from the inlet port 4020 and / or the liquid conduits 306, 3060.

[0454] Figure 43 A side view of the feed device connectors 305, 3040 showing hidden details (such as the connector holes 5140, the circumferential channel 11080) is shown. The axis 12020 of the feed device connectors 305, 3040 is also shown. As shown, the proximal portion 11020, the flange 11060, and the distal portion 11040 may be coaxial.

[0455] Figures 44 to 47 Other possible examples of the feed device connectors 305, 3040 for the water feed device assemblies 302, 3020 are shown. Except as described below or as apparent from the drawings, the exemplary feed device connectors 305, 3040 may be similar to the feed device connectors 305, 3040 of the previous figures. The above details and variations are intended to apply equally to these examples.

[0456] Figure 44 An exemplary feed device connector 305, 3040 including a pair of tabs 11100 having different shapes is shown. In this example, the tabs 11100 may have a generally rectangular shape with rounded outer corners.

[0457] Figure 45 An exemplary feed device connector 305, 3040 including a pair of tabs 11100 having another different shape is shown. In this example, the tabs 11100 may be hemispherical or crescent-shaped.

[0458] Figure 46 Illustrates exemplary feed device connectors 305, 3040 including four tabs 11100. In this example, the tabs 11100 may each have an elongated shape with rounded ends.

[0459] Figure 47 Illustrates exemplary feed device connectors 305, 3040 including three tabs 11100. In this example, the tabs 11100 may have, for example, the Figure 46 same shape.

[0460] Tabs 11100 of different shapes may assist a user in distinguishing the feed device connectors 305, 3040 from other feed device connectors used in different medical applications. Such visual and / or tactile differences may further help reduce the risk of misconnection. Grooves and bends may also be provided on the tabs 11100 to improve ergonomics and aid in the usability of the feed device connectors 305, 3040.

[0461] Figure 48 Illustrates a longitudinal cross-section of the feed device connectors 305, 3040 when inserted into the inlet port 4020.

[0462] The connector holes 5140 of the feed device connectors 305, 3040 may have a width, for example a diameter, between about 1.75 mm and 1.95 mm, such as about 1.9 mm. The diameter of the connector hole may be between about 50% and 70% or between about 55% and 65% of the diameter of the humidification chamber hole 5040 at the edge 6240 of the shoulder 6140, such as about 60%. The humidification chamber hole 5040 having a larger diameter than the connector hole 5140 ensures that liquid can easily travel from the water bag through the feed device connectors 305, 3040 and into the interior of the humidification chambers 104, 1140.

[0463] The feed device connectors 305, 3040 may engage the inlet port 4020 in an interference fit (e.g., friction fit). In other examples, the inlet port 4020 may engage the feed device connectors 305, 3040 in other forms of interference fit (e.g., snap fit) that provide a secure connection between the two components.

[0464] The flange 11060 and / or the tabs 11100 may be configured to be spaced apart from the inlet end 5160 of the inlet port 4020 when the feed device connectors 305, 3040 are fully inserted into the inlet port 4020.

[0465] The sizes of the feed device connectors 305, 3040 and the inlet port 4020 can be designed such that only the first part 6020 of the humidification chamber hole 5040 is configured to receive the feed device connectors 305, 3040. The feed device connectors 305, 3040 and the inlet port 4020 can be configured such that the first part 6020 of the humidification chamber hole 5040 does not receive the entire distal portion 11040 of the feed device connectors 305, 3040. In some examples, the inlet port 4020 can receive between about 45% and 90%, between about 60% and 80%, or between about 65% and 75%, such as about 69%, of the length of the distal portion 11040 of the feed device connectors 305, 3040.

[0466] The sizes of the feed device connectors 305, 3040 and the inlet port 4020 can be designed such that the distal end 5120 of the feed device connectors 305, 3040 is spaced apart from the shoulder 6140 of the inlet port 4020. The distal end 5120 can be spaced apart from the shoulder 6140 of the inlet port 4020 by at least 1 mm. In some examples, the distal end 5120 can be spaced apart from the shoulder 6140 by between about 1 mm and 5 mm, such as about 3 mm.

[0467] The degree of engagement between the feed device connectors 305, 3040 and the inlet port 4020 can determine the security of the connection between the feed device connectors 305, 3040 and the inlet port 4020. If less than 45% of the distal portion 11040 engages with the inlet port 4020, a relatively large proportion of the feed device connectors 305, 3040 will be located outside the inlet port 4020. This may cause the user to suspect that the feed device connectors 305, 3040 have been inserted insufficiently or incorrectly. If the feed device connectors 305, 3040 engage too deeply with the inlet port 4020 and contact the shoulder 6140 of the inlet port 4020, there may not be enough friction between the feed device connectors 305, 3040 and the side wall 5020 of the inlet port 5060 to establish a firm connection. In the illustrated example, the engagement level between the feed device connectors 305, 3040 and the inlet port 4020 can provide sufficient friction such that the force required to disconnect the feed device connectors 305, 3040 from the inlet port 4020 is high enough to reduce the risk of accidental disconnection between the feed device connectors 305, 3040 and the inlet port 4020, while also allowing the user to deliberately disconnect the two components when needed.

[0468] Port accessory

[0469] A port accessory can be provided for the humidification chamber. The port accessory can be configured to engage with the inlet port.

[0470] Figure 49An exemplary port attachment 18020 is shown. The port attachment 18020 can be configured to couple to an inlet port 4020 of a humidification chamber 104, 1140, 33020. The port attachment 18020 can be configured to selectively engage the inlet port 4020 in at least one of two different configurations. The two different configurations can include an adapter configuration and a closed configuration.

[0471] The port attachment 18020 can include an adapter portion 18040. The size of the adapter portion 18040 can be designed to couple to the inlet port 4020 of the humidification chamber 104, 1140, 33020. In particular, when the port attachment 18020 selectively engages the inlet port 4020 in the adapter configuration. In some examples, the adapter portion 18040 can be configured to be inserted into a humidification chamber bore 5040 of the inlet port 4020. The adapter portion 18040 can have a first end and a second end. An adapter bore 18060 can extend through the adapter portion between the first end and the second end. When viewed along the axis of the adapter portion, the adapter bore 18060 can have a circular shape. The width of the adapter bore 18060, e.g., diameter, can taper from the first end to the second end. The taper can be constant or can be variable. In other examples, the adapter bore 18060 can be substantially cylindrical.

[0472] The first end of the adapter portion can be configured to fluidly couple to a feed device connector. The second end of the adapter portion 18040 can be configured to fluidly couple to the inlet port 4020.

[0473] The size of the adapter bore 18060 can be designed to at least partially receive an alternative feed device connector that may not be able to engage the inlet port 4020 securely directly. The port attachment 18020 can thus enable the use of a wider range of feed device connectors with the humidification chamber 104, 1140, 33020.

[0474] In some examples, the port attachment 18020 can be incompatible with ISO-compliant connectors. In other examples, the port attachment 18020 can be compatible with at least a subset of ISO-compliant connectors. Additional steps to engage the port attachment 18020 with the inlet port 4020 in the adapter configuration may be sufficient to mitigate the risk of misconnection with medical devices or accessories other than the feed device connector or the water feed device assembly.

[0475] The adapter portion 18040 can have a proximal portion and a distal portion. At least a portion of the proximal portion can be configured to receive an alternative feed device connector within the adapter bore 18060. The proximal portion can be configured to receive the alternative feed device connector in an interference fit (e.g., friction fit).

[0476] At least a portion of the distal portion can be configured to be inserted into the humidification chamber aperture 5040 of the inlet port 4020 during use when in the adapted configuration.

[0477] The adapter portion 18040 can include an adapter flange 18080 extending outwardly from the adapter portion 18040. The adapter flange 18080 can extend generally perpendicular to the axis of the adapter portion 18040. The adapter flange 18080 can be located at a first end of the adapter portion 18040. The adapter flange 18080 can be generally circular or annular in shape.

[0478] The shape of the adapter flange 18080 can correspond to the shape of the flange 11060 of the feed device connectors 305, 3040. The similarly shaped flanges 11060, 18080 can assist the user and provide a visual indication that the port attachment 18020 will be grasped at the adapter flange 18080 when in the adapted configuration. The similarity in shape can also indicate to the user that this portion of the port attachment 18020 is designed to be coupled to the feed device connector.

[0479] The adapter portion 18040 can include one or more tabs 18100. The adapter portion can include a pair of tabs 18100. The tabs 18100 can be equidistantly positioned about the circumference of the adapter flange 18080, for example a pair of tabs 18100 can be diametrically opposed. The tabs 18100 can extend generally perpendicular to the axis of the adapter portion. The tabs 18100 can extend radially from the adapter flange 18080. The tabs 18100 can be semi-circular or crescent-shaped.

[0480] The port attachment 18020 can include a closure portion 18120. The closure portion 18120 can be configured to couple to the inlet port 4020 of the humidification chamber 104, 1140, 33020. More specifically, the closure portion 18120 can couple to the inlet port 4020 of the humidification chamber 104, 1140, 33020 when the port attachment 18020 is selectively engaged with the inlet port 4020 in the closed configuration. The closure portion 18120 can be configured to enclose and preferably seal the humidification chamber aperture 5040. When liquid is not required to be delivered to the interior of the humidification chamber 104, 1140, 33020, the port attachment 18020 can be coupled to the inlet port 4020 in the closed configuration. Doing so can mitigate the risk of misconnection and / or contamination.

[0481] In some examples, the closure portion 18120 can be configured as an end cap for the inlet port 4020. The closure portion 18120 can be configured to engage the outer surface of the inlet port in a closed configuration. The closure portion 18120 can include a cavity 19020 (see Figure 49 ). The cavity 19020 can be a blind hole. The cavity 19020 can be configured to receive at least a portion of the inlet port 4020, such as at least a portion of the sidewall 5020. The closure portion 18120 can be configured to engage the outer surface 6060 of the inlet port 4020 in an interference fit (e.g., a friction fit).

[0482] In other examples, the closure portion 18120 can be configured as a stop for the inlet port 4020. In such an example, the closure portion 18120 can be configured to be inserted into the humidification chamber hole 5040 of the inlet port 4020.

[0483] The adapter portion 18040 and the closure portion 18120 can be integrally formed. In some examples, as shown, the adapter portion 18040 and the closure portion 18120 can be substantially perpendicular to each other.

[0484] In at least some examples, the adapter portion 18040 and the closure portion 18120 can be configured such that they cannot both engage the inlet port 4020 of the humidification chambers 104, 1140, 33020 simultaneously.

[0485] The port attachment 18020 can include a protruding rib 18140. The protruding rib 18140 can have a retaining hole 18160. The retaining hole 18160 can be configured to engage a tether for retaining the port attachment 18020 to the humidification chambers 104, 1140, 33020, as described further in detail below. The protruding rib 18140 can be integrally formed with the adapter portion 18040 and / or the closure portion 18120.

[0486] Figure 50 A transverse cross-section of the port attachment 18020 is shown on its side.

[0487] The closed portion 18120 can have a peripheral wall 19040 and an end wall 19060. The peripheral wall 19040 and the end wall 19060 can define a cavity 19020 in the closed portion 18120. The peripheral wall 19040 can have a first end and a second end. The first end of the peripheral wall 19040 can be connected to the end wall 19060. When viewed along the axis of the closed portion 18120, the peripheral wall 19040 can have a circular shape. The width (e.g., diameter) of the cavity 19020 can taper from the second end to the first end. The cavity 19020 of the closed portion 18120 can be substantially frustoconical. In other examples, it can be substantially cylindrical.

[0488] The axis 19080 of the closed portion 18120 and the axis 19100 of the adapter portion 18040 are also shown. As shown, in some examples, the axes can be perpendicular to each other.

[0489] Figure 51 A port attachment 18020 engaged with the inlet port 4020 of the same humidification chamber 104, 1140, 33020 is shown, but in a closed configuration. In this configuration, the closed portion 18120 closes or seals the humidification chamber aperture 5040 of the inlet port 4020. The cavity 19020 can be coaxial with the humidification chamber aperture 5040.

[0490] Figure 52 A cross-section through the port attachment 18020 when engaged with the inlet port 4020 of the humidification chamber 104, 1140, 33020 in a closed configuration is shown, where the closed portion 18120 receives the inlet port 4020.

[0491] The closed portion 18120 of the port attachment 18020 can engage the inlet port 4020 with an interference fit (e.g., friction fit). In other forms, the inlet port 4020 can engage the closed portion 18120 with other forms of interference fit (e.g., snap fit) that provide a secure connection between the two components.

[0492] As shown, the closure portion 18120 can be configured as an end cap for the inlet port 4020. At least a portion of the closure portion 18120 can be configured to be positioned around at least a portion of the sidewall 5020 of the inlet port 4020. The peripheral wall 19040 of the closure portion 18120 can be configured to be positioned on the sidewall 5020 of the inlet port 4020 such that at least a portion of the inlet port 4020 is received within the cavity 19020 of the closure portion. The closure portion 18120 can have a hollow frustoconical shape. The cavity 19020 of the closure portion 18120 can taper towards the end wall 19060 of the closure portion 18120. The taper can be or include a constant taper rate. The cavity 19020 of the closure portion 18120 preferably tapers at substantially the same rate as the outer surface 6060 of the sidewall 5020 of the inlet port 4020. The dimensions of the closure portion 18120 can be designed such that the width (e.g., diameter) of the cavity 19020 is only slightly larger than the outer diameter or width of the inlet port 4020. This can increase the surface area at the contact portion between the peripheral wall 19040 of the closure portion 18120 and the sidewall 5020 of the inlet port 4020. This extended contact can provide a high enough frictional force between the two components to establish a secure connection by friction fit.

[0493] The dimensions of the closure portion 18120 and the inlet port 4020 can be designed such that when the two components are joined, the end wall 19060 of the closure portion 18120 contacts the inlet end 5160 of the inlet port 4020. In some examples, the end wall can be spaced apart from the inlet end 5160 of the inlet port 4020.

[0494] In some examples, the height of the peripheral wall 19040 of the closure portion 18120 can be at least 80% or at least 90% of the height of the sidewall 5020 of the inlet port 4020. When fully engaged with the inlet port 4020 as Figure 52 shown, the peripheral wall 19040 can extend downward to near the rounded corner 6100 between the top 4040 and the sidewall 5020 of the humidification chamber 104, 1140, 33020.

[0495] Figure 53 Another example of the humidification chamber 104, 1140, 33020 including the port attachment 18020 is shown.

[0496] The port attachment 18020 is shown engaged with the inlet port 4020 of the humidification chamber 104, 1140, 33020 in an adapter configuration. In this configuration, the adapter portion 18040 can be at least partially received within the humidification chamber bore 5040 of the inlet port 4020. The adapter bore 18060 can be coaxial with the humidification chamber bore 5040.

[0497] Except as described below or as apparent from the drawings, at least Figure 3 the exemplary humidification chambers 104, 1140, 33020 may be similar to Figure 25 the humidification chambers 104, 1140, 33020, and the above details and variations are intended to apply equally to this example and vice versa.

[0498] In this example, both the gas inlets 113, 1180 and the gas outlets 114, 1200 are offset from the center of the humidification chambers 104, 1140, 33020. The gas inlets 113, 1180 and the gas outlets 114, 1200 may be located on opposite sides of the humidification chambers 104, 1140, 33020 (such as the top 4040).

[0499] The tether mount 20020 may extend outward (such as upward) from the humidification chambers 104, 1140, 33020 (such as the top 4040). The tether mount 20020 may have retention holes (hidden) similar to the retention holes of the protruding rib 18140.

[0500] The tether 20040 may extend between the tether mount 20020 and the port attachment 18020. The tether 20040 may engage the corresponding retention holes 18160 of the tether mount 20020 and the protruding rib 18140. The tether 20040 may be formed of an elastic material. The tether 20040 may be forced through the corresponding retention holes 18160. The tether 20040 may elastically recover to engage the tether mount 20020 and / or the protruding rib 18140 with an interference fit. The tether 20040 may hold the port attachment 1802 to the humidification chambers 104, 1140, 33020 to prevent its loss.

[0501] Figure 54 Shown is the port attachment 18020 engaged with the humidification chambers 104, 1140, 33020 in an adapted configuration, and an alternative feed device connector 23020 of the adapter portion 18040 coupled to the port attachment 18020.

[0502] The alternative feed device connector 23020 may in turn be configured to be fluidly coupled to a liquid conduit fluidly coupled to a water source (not shown), similar to the feed device connectors 305, 3040 described above.

[0503] Figure 55 Shown is a longitudinal section through the port attachment 18020 when engaged with the inlet port 4020 of the humidification chambers 104, 1140, 33020 in an adapted configuration, where the adapter portion 18040 is inserted into the humidification chamber bore 5040.

[0504] The distal portion of the adapter portion 18040 can be configured to be received by the inlet port 4020 with an interference fit (e.g., a friction fit). In other examples, the inlet port can receive the adapter portion with other forms of interference fit (e.g., a snap fit) that provide a secure connection between the two components.

[0505] The distal portion can have a hollow frustoconical shape. The distal portion can taper towards the second end of the adapter portion 18040. The taper can be or include a constant taper rate. The distal portion of the adapter portion 18040 can taper at a rate between about 4% and 8%, or between about 5% and 7%, e.g., at a rate of about 6%. The distal portion of the adapter portion 18040 preferably tapers at substantially the same rate as the first portion 6020 of the humidification chamber aperture 5040. The adapter portion 18040 can have an outer diameter or width at the second end between about 6 mm and 8 mm, e.g., about 7 mm. This can increase the surface area at the contact portion between the distal portion of the adapter portion 18040 and the sidewall 5020 of the inlet port 4020. This extended contact can provide a high enough frictional force between the two components to establish a secure connection through a friction fit. The secure connection can mitigate leakage between the two components.

[0506] The adapter flange 18080 (and / or tab 18100) can be configured to be grasped by the user while connecting the adapter portion 18040 to the inlet port 4020 and / or an alternative feed device connector 23020 (omitted from Figure 55 and / or disconnecting it therefrom. In some examples, the adapter flange 18080 can serve as a stop when the adapter portion 18040 is inserted into the inlet port 4020 and / or receives an alternative feed device connector 23020.

[0507] As shown, the adapter flange 18080 and / or tab 18100 can be configured to be spaced apart from the inlet end 5160 of the inlet port 4020 when the adapter portion 18040 is fully inserted into the inlet port 4020.

[0508] The dimensions of the adapter portion 18040 and the inlet port 4020 can be designed such that only the first portion of the humidification chamber aperture 5040 is configured to receive the adapter portion 18040. The adapter portion 18040 and the inlet port 4020 can be configured such that the first portion 6020 of the humidification chamber aperture 5040 does not receive the entire distal portion of the adapter portion.

[0509] As shown, the dimensions of the adapter portion 18040 and the inlet port 4020 can be designed such that the second end of the adapter portion 18040 is spaced apart from the shoulder 6140 of the inlet port 4020. In some examples, the second end of the adapter portion 18040 can be spaced apart from the shoulder 6140 of the inlet port 4020 by at least 1 mm. In some examples, the second end of the adapter portion 18040 can be configured to be spaced apart from the shoulder 6140 by between about 1 mm and 5 mm, such as about 3 mm.

[0510] The degree to which the adapter portion 18040 engages with the inlet port 4020 can determine the security of the connection between the adapter portion 18040 and the inlet port 4020. If less than 45% of the distal portion engages with the inlet port 4020, a relatively large proportion of the adapter portion 18040 will be located outside the inlet port 4020. This may cause the user to suspect that the adapter portion 18040 has been inserted insufficiently or incorrectly.

[0511] If the adapter portion 18040 engages too deeply with the inlet port 4020 and contacts the shoulder 6140 of the inlet port 4020, there may not be sufficient friction between the adapter portion 18040 and the sidewall 5020 of the inlet port 4020 to establish a secure connection. In the example shown, the degree of engagement between the adapter portion 18040 and the inlet port 4020 can provide sufficient friction such that the force required to disconnect the adapter portion 18040 from the inlet port 4020 is high enough to reduce the risk of the adapter portion 18040 and the inlet port 4020 disconnecting accidentally, while still allowing the user to deliberately disconnect the two components when needed.

[0512] Figure 56 Another example of the port attachment 18020 is shown. Except as described below or as apparent from the drawings, Figure 25 the port attachment 18020 can be similar to Figure 49 the port attachment 18020. The details and variations described above are intended to apply equally to this example, and vice versa.

[0513] In this example, the port attachment 18020 can be configured as a stop for the inlet port 4020. The closure portion 18120 can be configured to be inserted into the humidification chamber hole 5040 of the inlet port 4020. The cavity can be omitted from the closure portion 18120. The closure portion 18120 can be hollow or solid.

[0514] The closed portion 18120 may have a first end and a second end. At least a portion of the closed portion 18120 may be configured to be inserted into the humidification chamber bore 5040 of the inlet port 4020 when the port attachment 18020 is in the closed configuration during use. The closed portion 18120 may be configured to be received by the inlet port 4020 with an interference fit (e.g., a friction fit). The closed portion 18120 may have a frustoconical shape. The width of the closed portion 18120, e.g., the diameter, may taper towards the second end of the closed portion 18120. The taper may be or include a constant taper rate. The closed portion 18120 may taper at a rate between about 4% and 8%, or between about 5% and 7%, e.g., at a rate of about 6%. The closed portion 18120 preferably tapers at substantially the same rate as the first portion 6020 of the humidification chamber bore 5040. The closed portion 18120 may have an outer diameter or width at the second end between about 6 mm and 8 mm, e.g., about 7 mm. This may increase the surface area at the contact portion between the closed portion 1812 and the sidewall 5020 of the inlet port 4020. This extended contact may provide a high enough frictional force between the two components to establish a secure connection by a friction fit.

[0515] Figure 57 Another example of the port attachment 18020 is shown. The port attachment 18020 may have a protruding rib 18140. The protruding rib 18140 may have a retention hole 18160. The retention hole 18160 may be configured to engage a tether to hold the port attachment 18020 to the humidification chamber 104, 1140, 33020, as described in further detail above. The retention hole 18160 may be located at the lower corner of the protruding rib 18140, e.g., Figure 57 as shown. Additionally or alternatively, the retention hole 18160 may be located near the adapter portion 18040.

[0516] The adapter portion 18040 may include features as disclosed with respect to Figures 42 to 56 the same.

[0517] The protruding rib 18140 may be integrally formed with the adapter portion 18040 and / or the closed portion 18120.

[0518] The protruding rib 18140 may be used as a separation tool (e.g., similar to the separation tool 411) to assist in separating the body 110 from the base 111 of the humidification chamber. The protruding rib 18140 may be configured to engage one or more removal features (e.g., the removal assist feature 170 and / or the removal feature 25100).

[0519] The protruding rib 18140 can be configured to engage with the removal assist feature 170 of the humidification chamber to improve the ease of separating the body 110 of the humidification chamber from the base 111 (e.g., as shown in Figure 24 ). Additionally or alternatively, the protruding rib 18140 can be configured to engage with the removal feature 25100, as shown in at least Figures 26 to 28 . The removal feature 25100 can be configured to assist in disassembling the hollow body from the base (i.e., the surrounding member and the heat conductor 4120, 25020) of the humidification chambers 104, 1140, 33020.

[0520] The tether that connects the humidification chamber to the port attachment 18020 (e.g., through the connection between the tether mount and the retention hole 18160) can have a sufficient length such that the port attachment 18020 can be manipulated by the user so that the protruding rib 18140 can be used as a separation tool (e.g., by engaging with one or more removal features). This length can depend on, for example, the location of the tether mount, the size of the humidification chamber, and the location of the removal features. For example, if the tether does not have a sufficient length, the user may not be able to engage the protruding rib 18140 with one or more removal features.

[0521] For example, as shown in Figure 57 , the protruding rib 18140 is oriented substantially perpendicular to the adapter portion 18040. Alternatively, the protruding rib 18140 can be oriented substantially parallel to the adapter portion 18040.

[0522] The protruding rib 18140 can extend across the entire width of the closure portion 18120 (e.g., the diameter of the circular closure portion 18120 as shown in Figure 57 ) or at least partially across the width of the closure portion 18120.

[0523] Glossary

[0524] "ISO-compliant connector" means a connector that complies with any of the following standards of the International Organization for Standardization (ISO), the entire contents of which are incorporated herein by reference:

[0525] ISO 80369-3:2016 - Small-bore connectors for liquids and gases in healthcare applications - Part 3: Connectors for enteral applications;

[0526] IEC 80369-5:2016 - Small-bore connectors for liquids and gases in healthcare applications - Part 5: Connectors for limb cuff inflation applications;

[0527] ISO 80369-6:2016 - Small-bore connectors for liquids and gases in healthcare applications - Part 6: Connectors for axonal applications; and

[0528] ISO 80369-7:2021 - Small-bore connectors for liquids and gases in healthcare applications - Part 7: Connectors for intravascular or subcutaneous applications.

[0529] Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprising", "including", and the like shall be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

[0530] In the foregoing description, when reference is made to integers or components having known equivalents, those integers or components are incorporated herein as if individually set forth.

[0531] The disclosed methods, apparatuses, and systems may also be widely regarded as including the components, elements, or features, individually or jointly mentioned or indicated in this disclosure, in any or all combinations of two or more of the components, elements, and features.

[0532] Any reference in this specification to any prior art is not and should not be taken as an admission or any form of indication that such prior art forms part of the common general knowledge in the art in any country in the world.

[0533] Unless otherwise stated herein, the recitation of numerical ranges herein is merely intended to be a shorthand method of referring individually to each separate value falling within the range, and each separate value is incorporated into this disclosure as if it were individually recited herein. Additionally, each subrange of values within a range is incorporated into this disclosure as if it were individually recited herein.

[0534] Although the present disclosure has been described in accordance with certain embodiments, other embodiments that are obvious to those of ordinary skill in the art are also within the scope of the present disclosure. Accordingly, various changes and modifications may be made without departing from the spirit and scope of the present disclosure. For example, various components may be repositioned as needed. Additionally, not all features, aspects, and advantages are necessary for practicing the present disclosure. Accordingly, the scope of the present disclosure is intended to be defined only by the following claims.

[0535] Clause

[0536] 1. A humidification chamber configured to be used with a breathing circuit assembly, the humidification chamber comprising:

[0537] A body;

[0538] A base connected to the body;

[0539] A cavity at least partially defined by the body and the base to hold a volume of liquid;

[0540] An inlet into the cavity;

[0541] An outlet out of the cavity; and

[0542] A circuit end cap configured to receive a breathing circuit component of a breathing circuit assembly.

[0543] 2. The humidification chamber according to the preceding clause, wherein the circuit end cap is configured to block an end of the breathing circuit component.

[0544] 3. The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap is integrally formed with the body.

[0545] 4. The humidification chamber according to the preceding clause, wherein the circuit end cap cannot be removed from the body.

[0546] 5. The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap is provided on the body, outside the cavity and isolated from the cavity.

[0547] 6. The humidification chamber according to the preceding clause, wherein the circuit end cap does not form a passage into the cavity.

[0548] 7. The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap protrudes from the body.

[0549] 8. The humidification chamber according to the preceding clause, wherein the circuit end cap extends substantially vertically from the top surface of the body.

[0550] 9. The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap has a height of at least 5 mm.

[0551] 10. The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap has an outer diameter between 8 mm and 30 mm.

[0552] 11. The humidification chamber according to the preceding clause, wherein the circuit end cap has an outer diameter of 12 mm.

[0553] 12. The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap has an outer diameter substantially the same as the inner diameter of the breathing circuit component that the circuit end cap is configured to receive.

[0554] 13. The humidification chamber according to any one of the preceding clauses, wherein a sealed connection is formed between the sealing surface of the circuit end cap and the breathing circuit component.

[0555] 14. The humidification chamber according to the preceding clause, wherein the sealing surface of the circuit end cap is located on the outer periphery of the circuit end cap, and the outer periphery is configured to engage with the inner surface of the breathing circuit component.

[0556] 15. A humidification chamber according to any one of clauses 12 to 14, wherein the sealed connection portion is tapered.

[0557] 16. A humidification chamber according to any one of the preceding clauses, wherein the size and geometry of the circuit end cap are configured to receive a breathing circuit component via a friction fit.

[0558] 17. A humidification chamber according to any one of the preceding clauses, wherein the circuit end cap includes a generally cylindrical shape.

[0559] 18. A humidification chamber according to any one of the preceding clauses, wherein the circuit end cap includes a generally smooth outer perimeter.

[0560] 19. A humidification chamber according to any one of the preceding clauses, wherein the circuit end cap is hollow.

[0561] 20. A humidification chamber according to any one of clauses 1 to 18, wherein the circuit end cap is solid.

[0562] 21. A humidification chamber according to any one of the preceding clauses, wherein the circuit end cap includes a generally flat top surface.

[0563] 22. A humidification chamber according to any one of clauses 1 to 20, wherein the circuit end cap includes a recessed top surface.

[0564] 23. A humidification chamber according to any one of clauses 1 to 20, wherein the circuit end cap includes a ribbed top surface.

[0565] 24. A humidification chamber according to the preceding clause, wherein the ribbed top surface includes a cross shape.

[0566] 25. A humidification chamber according to clause 23, wherein the ribbed top surface includes a Y shape.

[0567] 26. A humidification chamber according to any one of clauses 8 to 25, wherein the circuit end cap is located at or towards a central region on the top surface of the body.

[0568] 27. A humidification chamber according to any one of clauses 5 to 26, wherein the circuit end cap is located in a region between the inlet and the outlet on the top surface of the body.

[0569] 28. A humidification chamber according to any one of clauses 5 to 27, wherein the circuit end cap is offset from the center on the top surface of the body.

[0570] 29. A humidification chamber according to any one of the preceding clauses, wherein the inlet includes an inlet port defining a passage into the cavity of the humidification chamber, and the outlet includes an outlet port defining a passage out of the cavity of the humidification chamber, and the inlet port and the outlet port are configured to provide connections to a supply conduit and an inhalation conduit, respectively.

[0571] The humidification chamber according to any one of the preceding clauses further comprises a liquid filling port.

[0572] The humidification chamber according to the preceding clause further comprises a plug configured to block the liquid filling port.

[0573] The humidification chamber according to the preceding clause further comprises a tether configured to hold the plug to the body.

[0574] The humidification chamber according to any one of the preceding clauses, wherein the body comprises a generally circular shape with generally smooth sides.

[0575] The humidification chamber according to the preceding clause, wherein the body comprises a dome shape.

[0576] The humidification chamber according to any one of the preceding clauses, wherein the body and the base are removably attached to each other.

[0577] The humidification chamber according to any one of the preceding clauses, wherein the humidification chamber further comprises a sealing element located between the body and the base.

[0578] The humidification chamber according to any one of the preceding clauses, wherein the circuit end cap is configured to support a Y-shaped connector.

[0579] The humidification chamber according to the preceding clause, wherein the circuit end cap is configured to support the patient end of the Y-shaped connector.

[0580] A humidification system, comprising:

[0581] The humidification chamber according to any one of the preceding clauses; and

[0582] A breathing circuit assembly for providing a path for gas travel.

[0583] The humidification system according to the preceding clause further comprises a heater base configured to heat at least some of the contents of the humidification chamber.

[0584] The humidification system according to any one of clauses 39 or 40, wherein the breathing circuit assembly comprises a supply conduit, an inhalation conduit, and an exhalation conduit.

[0585] The humidification system according to the preceding clause, wherein the breathing circuit assembly comprises a Y-shaped connector configured to connect the inhalation conduit and the exhalation conduit.

[0586] The humidification system according to the preceding clause, wherein the circuit end cap is sized and configured to receive the Y-shaped connector.

[0587] 44. A humidification chamber or a humidification system according to any one of the preceding clauses, wherein the humidification chamber includes a chamfered edge portion.

[0588] 45. A humidification chamber or a humidification system according to the preceding clause, wherein the chamfered edge portion is at least partially located on the top surface of the humidification chamber.

[0589] 46. A humidification chamber or a humidification system according to any one of clauses 44 or 45, wherein the humidification chamber includes more than one chamfered edge portion.

[0590] 47. A humidification chamber or a humidification system according to the preceding clause, wherein the humidification chamber includes a pair of chamfered edge portions located on opposite sides of the humidification chamber.

[0591] 48. A humidification chamber or a humidification system according to any one of the preceding clauses, wherein the humidification chamber includes a removal aid feature, which is a cutout on the bottom edge of the humidification chamber.

[0592] 49. A humidification chamber or a humidification system according to the preceding clause, wherein the removal aid feature is a slot.

[0593] 50. A humidification chamber or a humidification system according to any one of clauses 47 to 49, wherein the removal aid feature is located on the lower edge of the body.

[0594] 51. A humidification chamber or a humidification system according to any one of clauses 47 to 51, wherein the removal aid feature does not extend to the top edge of the edge on the bottom of the humidification chamber.

[0595] 52. A humidification system according to any one of clauses 39 to 51, further comprising a separation tool for assisting in separating the body of the humidification chamber from the base.

[0596] 53. A humidification system according to the preceding clause, wherein the separation tool is configured to engage with the removal aid feature of the humidification chamber.

[0597] 54. A humidification system according to any one of clauses 52 or 53, wherein the separation tool is substantially flat.

[0598] 55. A humidification system according to the preceding clause, wherein the separation tool has a flat bottom region and an inclined top surface region.

[0599] 56. A humidification chamber or a humidification system according to any one of the preceding clauses, wherein the outlet is positioned further away from the side wall of the humidification chamber than the inlet.

[0600] 57. A humidification chamber or a humidification system according to any one of the preceding clauses, wherein the outlet is positioned closer to the center compared to the side wall of the humidification chamber.

[0601] 58. A breathing circuit kit for use in a humidified breathing assistance system, the breathing circuit kit comprising:

[0602] A humidification chamber configured to contain a liquid, the humidification chamber including an inlet port for supplying the liquid to the interior of the humidification chamber in use, the inlet port including:

[0603] A humidification chamber aperture providing a passage for the liquid from an inlet end external to the humidification chamber to an outlet end internal to the humidification chamber;

[0604] A sidewall defining a first portion of the humidification chamber aperture, the first portion of the humidification chamber aperture tapering at least partially towards the outlet end of the humidification chamber aperture; and

[0605] A shoulder defining a second portion of the humidification chamber aperture, the shoulder extending inwards from the sidewall;

[0606] A liquid conduit; and

[0607] A feed device connector including a proximal portion and a distal portion, the proximal portion and the distal portion at least partially defining a connector aperture extending from the proximal end of the feed device connector to the distal end of the feed device connector, wherein in use the proximal portion is configured to be coupled to the liquid conduit and the distal portion is configured to be coupled to the inlet port.

[0608] 59. The breathing circuit kit according to clause 58, wherein the diameter of the second portion of the humidification chamber aperture is less than the outer diameter of an ISO-compliant connector.

[0609] 60. The breathing circuit kit according to clause 58 or 59, wherein the diameter of the second portion of the humidification chamber aperture is greater than the outer diameter of a first ISO-compliant connector and less than the outer diameter of a second ISO-compliant connector, wherein the first ISO-compliant connector is different from the second ISO-compliant connector.

[0610] 61. The breathing circuit kit according to any one of clauses 58 to 60, wherein the shoulder extends at least partially in a direction perpendicular to the axis of the humidification chamber aperture.

[0611] 62. The breathing circuit kit according to any one of clauses 58 to 61, wherein the first portion of the humidification chamber aperture at least partially includes a constant taper, preferably tapering at a rate between about 5% and 7%, more preferably at a rate of about 6%.

[0612] 63. The breathing circuit kit according to any one of clauses 58 to 62, wherein the distal portion of the feed device connector is configured to be coupled to the inlet port by an interference fit.

[0613] 64. The breathing circuit kit according to any one of clauses 58 to 63, wherein the inlet port is configured such that in use when the ISO-compliant first connector is inserted into the inlet port, the ISO-compliant first connector contacts the shoulder.

[0614] 65. The breathing circuit kit according to any one of clauses 58 to 64, wherein the first part of the humidification chamber aperture is configured to at least partially receive the distal part, preferably receive between about 45% and 90% of the distal part, more preferably receive between about 65% and 75% of the distal part, and most preferably receive about 69% of the distal part.

[0615] 66. The breathing circuit kit according to any one of clauses 58 to 65, wherein the inlet port and / or the feed device connector is configured such that in use when the feed device connector engages with the inlet port, the feed device connector does not contact the shoulder.

[0616] 67. The breathing circuit kit according to any one of clauses 58 to 66, wherein the inlet port and / or the feed device connector is configured such that in use when the feed device connector engages with the inlet port, the feed device connector is spaced apart from the shoulder by at least 1 mm, preferably spaced apart between about 1 mm and 5 mm, and more preferably spaced apart about 3 mm.

[0617] 68. The breathing circuit kit according to any one of clauses 58 to 67, wherein the exterior of the feed device connector tapers at least partially towards the distal end of the feed device connector, preferably at least partially includes a constant taper, more preferably tapers at a rate between about 5% and 7%, more preferably tapers at a rate of about 6%, and most preferably tapers at a rate substantially the same as the first part of the humidification chamber aperture.

[0618] 69. The breathing circuit kit according to any one of clauses 58 to 68, wherein at least one and preferably both of the sidewall and the shoulder include an annular shape in a cross-section through the axis of the humidification chamber aperture.

[0619] 70. The breathing circuit kit according to any one of clauses 58 to 69, wherein the shoulder tapers at least partially towards the outlet end of the inlet port, preferably the shoulder at least partially includes a variable taper.

[0620] 71. The breathing circuit kit according to any one of clauses 58 to 70, wherein the outer diameter of the distal part at the distal end of the feed device connector is between about 6 mm and 8 mm, preferably about 7 mm.

[0621] 72. The breathing circuit kit according to any one of clauses 58 to 71, wherein the first part of the humidification chamber aperture has one or more of the following:

[0622] A longitudinal length between about 8.5 mm and 9 mm, preferably about 8.5 mm;

[0623] A minimum diameter between about 6.7 mm and 6.9 mm, preferably about 6.7 mm or 6.8 mm;

[0624] A maximum diameter between about 7.2 mm and 7.4 mm, preferably about 7.3 mm;

[0625] A diameter that tapers between about 0.3 mm and 0.7 mm, preferably about 0.5 mm or 0.6 mm; and / or

[0626] A minimum diameter that is substantially equal to or greater than the maximum diameter of the second part of the humidification chamber aperture.

[0627] 73. A breathing circuit kit according to any one of clauses 58 to 72, wherein the humidification chamber aperture tapers at least partially from the upstream end of the second part towards the outlet end of the inlet port.

[0628] 74. A breathing circuit kit according to any one of clauses 58 to 73, wherein the second part of the humidification chamber aperture has one or more of the following:

[0629] A maximum diameter not greater than about 3.3 mm;

[0630] A diameter at the transition between the upstream surface and the edge of the shoulder that is not greater than 3.3 mm, such as about 3.2 mm;

[0631] Preferably, a diameter at the upstream end of the second part that is between about 41% and 46%, preferably about 44%, of the diameter of the humidification chamber aperture at the inlet end of the inlet port; and / or

[0632] Preferably, a diameter at the upstream end of the second part that is between about 3.1 mm and 3.3 mm, preferably about 3.2 mm.

[0633] 75. A breathing circuit kit according to any one of clauses 58 to 74, wherein the side wall includes an outer surface that diverges outwardly from the inlet end of the inlet port.

[0634] 76. A breathing circuit kit according to any one of clauses 58 to 75, wherein the side wall of the inlet port does not have threads.

[0635] 77. A breathing circuit kit according to any one of clauses 58 to 76, wherein the side wall projects upward from the top of the humidification chamber.

[0636] 78. A breathing circuit kit according to any one of clauses 58 to 77, including any one or more of the following:

[0637] A humidifier supply tube configured to supply a respiratory gas flow to a gas inlet of a humidification chamber;

[0638] A patient supply tube configured to receive a respiratory gas flow from an outlet of the humidification chamber and deliver the respiratory gas flow toward a patient;

[0639] An exhalation tube configured to receive exhaled gas from the patient and deliver the exhaled gas away from the patient; and

[0640] A Y-piece configured to be fluidly coupled with the patient supply tube, the exhalation tube, and a patient interface.

[0641] 79. A respiratory circuit kit according to any one of clauses 58 to 78, comprising a port attachment including an adapter portion and a closure portion, the adapter portion and the closure portion being selectively engageable with an inlet port to respectively:

[0642] adapt the inlet port to be fluidly coupled with an alternative feed device connector having a size and / or shape different from a feed device connector configured to be directly coupled to the inlet port, or

[0643] close the inlet port.

[0644] 80. A respiratory circuit kit according to clause 79, wherein the adapter portion includes a first end and a second end, the second end being configured to engage the inlet port, the first end and the second end at least partially defining an adapter bore that extends through the adapter portion to provide a fluid flow path through the port attachment, at least one and preferably both of the adapter portion and the adapter bore are at least partially tapered from the first end to the second end, and the closure portion is preferably integrally formed with the adapter portion.

[0645] 81. A respiratory circuit kit according to clause 79 or 80, wherein the port attachment is tethered to the humidification chamber.

[0646] 82. A humidification chamber for use in a humidified respiratory assistance system, the humidification chamber being configured to contain a liquid and including an inlet port for supplying the liquid to the interior of the humidification chamber in use, the inlet port including:

[0647] a sidewall defining a first portion of a humidification chamber bore that provides a passage for the liquid from an inlet end external to the humidification chamber to an outlet end internal to the humidification chamber, the first portion of the humidification chamber bore being at least partially tapered toward an outlet end of the inlet port, and

[0648] a shoulder defining a second portion of the humidification chamber bore, the shoulder extending inwardly from the sidewall.

[0649] 83. The humidification chamber according to clause 82, wherein the diameter of the second part of the humidification chamber hole is smaller than the outer diameter of the ISO-compliant connector.

[0650] 84. The humidification chamber according to clause 82 or 83, wherein the diameter of the second part of the humidification chamber hole is larger than the outer diameter of the first ISO-compliant connector and smaller than the outer diameter of the second ISO-compliant connector, wherein the first ISO-compliant connector is different from the second ISO-compliant connector.

[0651] 85. The humidification chamber according to any one of clauses 82 to 84, wherein the shoulder extends at least partially in a direction perpendicular to the axis of the humidification chamber hole.

[0652] 86. The humidification chamber according to any one of clauses 82 to 85, wherein the first part of the humidification chamber hole at least partially includes a constant taper, preferably tapering at a rate between about 5% and 7%, more preferably tapering at a rate of about 6%.

[0653] 87. The humidification chamber according to any one of clauses 82 to 86, wherein at least one of, and preferably both, the side wall and the shoulder include an annular shape in a cross-section passing through the axis of the humidification chamber hole.

[0654] 88. The humidification chamber according to any one of clauses 82 to 87, wherein the shoulder tapers at least partially towards the outlet end of the inlet port, and the shoulder preferably includes a variable taper.

[0655] 89. The humidification chamber according to any one of clauses 82 to 88, wherein the first part of the humidification chamber hole has any one or more of the following:

[0656] A longitudinal length between about 8.5 mm and 9 mm, preferably about 8.5 mm;

[0657] A minimum diameter between about 6.7 mm and 6.9 mm, preferably about 6.7 mm or 6.8 mm;

[0658] A maximum diameter between about 7.2 mm and 7.4 mm, preferably about 7.3 mm;

[0659] A diameter tapering between about 0.3 mm and 0.7 mm, preferably about 0.5 mm or 0.6 mm; and / or

[0660] A minimum diameter that is substantially equal to or greater than the maximum diameter of the second part of the humidification chamber hole.

[0661] 90. The humidification chamber according to any one of clauses 82 to 89, wherein the humidification chamber hole tapers at least partially from the first end of the second part towards the outlet end of the inlet port.

[0662] 91. A humidification chamber according to any one of clauses 82 to 90, wherein the second part of the humidification chamber hole has any one or more of the following:

[0663] A maximum diameter of not more than about 3.3 mm;

[0664] The diameter at the transition between the upstream surface and the edge of the shoulder, which is not more than 3.3 mm, such as about 3.2 mm;

[0665] Preferably, the diameter at the upstream end of the second part is between about 41% and 46%, preferably about 44%, of the diameter of the humidification chamber hole at the inlet end of the inlet port; and / or

[0666] Preferably, the diameter at the upstream end of the second part is between about 3.1 mm and 3.3 mm, preferably about 3.2 mm.

[0667] 92. A humidification chamber according to any one of clauses 82 to 91, wherein the side wall includes an outer surface that diverges outward from the inlet end of the inlet port.

[0668] 93. A humidification chamber according to any one of clauses 82 to 92, wherein the side wall of the inlet port does not have threads.

[0669] 94. A humidification chamber according to any one of clauses 82 to 93, wherein the side wall of the inlet port projects upward from the top of the humidification chamber.

[0670] 95. A humidification chamber according to any one of clauses 82 to 94, which includes a port attachment, the port attachment including an adapter portion and a closure portion, the adapter portion and the closure portion being selectively engageable with the inlet port to respectively:

[0671] Make the inlet port suitable for fluid connection with an alternative feed device connector having a size and / or shape different from the feed device connector configured to be directly connected to the inlet port, or

[0672] Close the inlet port.

[0673] 96. For the humidification chamber according to clause 95, the adapter portion includes a first end and a second end, the second end being configured to engage the inlet port, the first end and the second end at least partially defining an adapter hole that extends through the adapter portion to provide a fluid flow path through the port attachment, at least one and preferably both of the adapter portion and the adapter hole taper at least partially from the first end to the second end, and the closure portion is preferably integrally formed with the adapter portion.

[0674] 97. For the humidification chamber according to clause 95 or 96, wherein the adapter portion is tethered to the humidification chamber.

[0675] 98. A water feeding device assembly for use in a respiratory assistance system, the water feeding device assembly comprising:

[0676] A liquid conduit;

[0677] A water source connector, such as a spike, configured to be fluidly coupled to a first end of the liquid conduit; and

[0678] A feeding device connector comprising a proximal portion and a distal portion, the proximal portion and the distal portion at least partially defining a connector bore extending from a proximal end of the feeding device connector to a distal end of the feeding device connector to provide a fluid flow path through the feeding device connector, wherein in use, the proximal portion is configured to be fluidly coupled to a second end of the liquid conduit and the distal portion is configured to be fluidly coupled to an inlet port of a humidification chamber of the respiratory assistance system.

[0679] 99. The water feeding device assembly according to clause 98, wherein the feeding device connector tapers at least partially towards the distal end of the feeding device connector, preferably at least partially includes a constant taper, more preferably tapers at a rate between about 5% and 7%, and even more preferably tapers at a rate of about 6%.

[0680] 100. The water feeding device assembly according to clause 98 or 99, wherein the outer diameter of the feeding device connector at the distal end is between about 6 mm and 8 mm, preferably about 7 mm.

[0681] 101. The water feeding device assembly according to any one of clauses 98 to 100, wherein at least one of the proximal portion and the distal portion includes a substantially frustoconical shape, and the feeding device connector preferably includes a flange located intermediate the proximal portion and the distal portion.

[0682] 102. A port accessory for use with a humidification chamber in a respiratory assistance system, the port accessory comprising:

[0683] An adapter portion including a first end and a second end, the first end and the second end defining an adapter bore extending through the adapter portion to provide a fluid flow path through the port accessory, the second end being configured to selectively engage with an inlet port of the humidification chamber, and at least one and preferably both of the adapter portion and the adapter bore taper at least partially from the first end to the second end; and

[0684] A closure portion integrally formed with the adapter portion, the closure portion being configured to selectively engage with the inlet port of the humidification chamber to close or seal the inlet port in use.

[0685] 103. A port attachment for use with a humidification chamber in a respiratory assistance system, the humidification chamber including an inlet port configured to engage a first feed device connector, the port attachment including an adapter portion and a closure portion, and the port attachment being configured to selectively engage the inlet port of the humidification chamber in one of an adapted configuration and a closed configuration, wherein:

[0686] In the adapted configuration, the adapter portion is configured to engage and be in fluid communication with the inlet port and a second feed device connector different from the first feed device connector, and

[0687] In the closed configuration, the closure portion is configured to engage the inlet port to seal or close the inlet port.

[0688] 104. A humidification chamber according to any one of clauses 79 - 81, 95 - 97, or 102 - 103, wherein the port attachment includes a protruding rib, and the protruding rib is configured to serve as a separation tool.

[0689] 105. A humidification chamber according to clause 104, wherein the protruding rib is configured to engage one or more removal features of the body and / or base of the humidification chamber to assist in disassembling the body from the base of the humidification chamber.

[0690] 106. A humidification chamber according to any one of the preceding clauses, for respiratory humidification or surgical humidification, the humidification chamber including: a hollow body including an inlet port and an outlet port; a heat conducting body; and a sealing element configured to provide a seal between the hollow body and the heat conducting body upon assembly; wherein the heat conducting body is configured to be removably attachable to the hollow body and has a heat capacity of less than about 30 joules per kelvin (J / K), less than about 27 J / K, between about 16 J / K and 27 J / K, between about 19 J / K and 24 J / K, between about 20 J / K and 22 J / K, about 21 J / K, or between about 20.7 J / K and 21.2 J / K.

[0691] 107. A humidification chamber according to clause 106, wherein the heat conducting body includes a thickness between about 0.2 mm and 1.2 mm, between about 0.2 mm and 1 mm, between about 0.4 mm and 0.9 mm, between about 0.6 mm and 0.8 mm, or about 0.7 mm.

[0692] 108. A humidification chamber according to clause 106 or 107, wherein the humidification chamber includes a surrounding member that is integral with, attached to, or attachable to the heat conducting body and is configured to engage a base unit of a humidifier in use.

[0693] 109. A humidification chamber according to clause 108, wherein the surrounding member includes one or more removal features configured to assist in disassembling the humidification chamber.

Claims

1. A humidification chamber configured to be used with a breathing circuit assembly, characterized in that, The humidification chamber includes: a main body; a base connected to the main body; a cavity at least partially defined by the main body and the base to hold a certain volume of liquid; an inlet into the cavity; an outlet out of the cavity; and a circuit end cap configured to receive a breathing circuit component of the breathing circuit assembly.

2. The humidification chamber according to claim 1, characterized in that, The circuit end cap is configured to block an end of the breathing circuit component.

3. The humidification chamber according to claim 1, characterized in that, The circuit end cap is integrally formed with the main body.

4. The humidifying chamber according to claim 3, wherein, The circuit end cap cannot be removed from the main body.

5. The humidification chamber according to claim 1, wherein The circuit end cap is disposed on the main body, outside the cavity and isolated from the cavity.

6. The humidifying chamber according to claim 5, characterized in that, The circuit end cap does not form a passage into the cavity.

7. The humidification chamber according to claim 1, characterized in that, The circuit end cap projects from the main body.

8. The humidification chamber according to claim 7, characterized in that, The circuit end cap extends substantially vertically from the top surface of the main body.

9. The humidifying chamber according to claim 1, wherein, The circuit end cap includes a height of at least 5 mm.

10. The humidification chamber according to claim 1, characterized in that, The circuit end cap includes an outer diameter between 8 mm and 30 mm.

11. The humidification chamber according to claim 10, characterized in that, The circuit end cap includes an outer diameter of 12 mm.

12. The humidifying chamber according to claim 1, characterized in that, The circuit end cap includes an outer diameter substantially the same as the inner diameter of the breathing circuit component that the circuit end cap is configured to receive.

13. The humidification chamber according to claim 1, wherein A sealed connection is formed between the sealing surface of the circuit end cap and the breathing circuit component.

14. The humidifying chamber according to claim 13, characterized in that, The sealing surface of the circuit end cap is located on the outer periphery of the circuit end cap, and the outer periphery is configured to engage with the inner surface of the breathing circuit component.

15. The humidifying chamber according to any one of claims 13 to 14, characterized in that, The sealed connection is tapered.

16. The humidification chamber according to claim 1, characterized in that, The size and geometry of the circuit end cap are configured to receive the breathing circuit component via a friction fit.

17. The humidifying chamber according to claim 1, characterized in that The circuit end cap includes a generally cylindrical shape.

18. The humidification chamber according to claim 1, wherein, The circuit end cap includes a generally smooth outer periphery.

19. The humidifying chamber according to claim 1, wherein The circuit end cap is hollow.

20. The humidification chamber according to claim 1, characterized in that, The circuit end cap is solid.

21. The humidifying chamber according to claim 1, characterized in that, The circuit end cap includes a generally flat top surface.

22. The humidification chamber according to claim 1, characterized in that, The circuit end cap includes a recessed top surface.

23. The humidifying chamber according to claim 1, wherein The circuit end cap includes a ribbed top surface.

24. The humidification chamber according to claim 23, wherein, The ribbed top surface includes a cross shape.

25. The humidification chamber according to claim 23, characterized in that, The ribbed top surface includes a Y shape.

26. The humidification chamber according to claim 8, characterized in that, The circuit end cap is located at or oriented towards a central region on the top surface of the main body.

27. The humidification chamber according to claim 5, characterized in that, The circuit end cap is in a region between the inlet and the outlet on the top surface of the main body.

28. The humidification chamber according to claim 5, wherein The circuit end cap is offset from the center on the top surface of the main body.

29. The humidifying chamber according to claim 1, characterized in that, The inlet includes an inlet port defining a passage into the cavity of the humidification chamber, and the outlet includes an outlet port defining a passage out of the cavity of the humidification chamber, and the inlet port and the outlet port are configured to provide connections to a supply conduit and an inhalation conduit, respectively.

30. The humidifying chamber according to claim 1, characterized in that, The humidification chamber further includes a liquid filling port.

31. The humidifying chamber according to claim 30, characterized in that, The humidification chamber further includes a plug configured to block the liquid filling port.

32. The humidifying chamber according to claim 31, wherein The humidification chamber further includes a tether configured to hold the plug to the main body.

33. The humidifying chamber according to claim 32, wherein, The main body includes a generally circular shape with a generally smooth side.

34. The humidification chamber according to claim 33, wherein The main body includes a dome shape.

35. The humidification chamber according to claim 1, characterized in that, The main body and the base are removably attached to each other.

36. The humidifying chamber according to claim 1, wherein, The humidification chamber further includes a sealing element located between the main body and the base.

37. The humidifying chamber according to claim 1, wherein The circuit end cap is configured to support a Y-shaped connector.

38. The humidification chamber according to claim 37, wherein, The circuit end cap is configured to support the patient end of the Y-shaped connector.

39. The humidification chamber according to claim 1, characterized in that, The humidification chamber includes a chamfered edge portion.

40. The humidifying chamber according to claim 39, characterized in that, The beveled edge portion is at least partially located on the top surface of the humidification chamber.

41. The humidification chamber according to any one of claims 39 or 40, characterized in that, The humidification chamber includes more than one of the beveled edge portions.

42. The humidifying chamber according to claim 41, wherein, The humidification chamber includes a pair of beveled edge portions located on opposite sides of the humidification chamber.

43. The humidification chamber according to claim 42, wherein, The humidification chamber includes a removal assistance feature, which is a cutout on the bottom edge of the humidification chamber.

44. The humidifying chamber according to claim 43, wherein, The removal assistance feature is a slot.

45. The humidification chamber according to claim 43, wherein The removal assistance feature is located on the lower edge of the body.

46. The humidification chamber according to claim 43, wherein, The removal assistance feature does not extend to the top edge of the edge on the bottom of the humidification chamber.

47. The humidifying chamber according to claim 1, characterized in that, The outlet is positioned further away from the side wall of the humidification chamber than the inlet.

48. The humidification chamber according to claim 1, characterized in that The outlet is positioned closer to the center on the top surface of the body compared to the side wall of the humidification chamber.

49. A humidification system, characterized in that, The humidification system includes: The humidification chamber according to claim 1; and A breathing circuit assembly for providing a path for gas travel.

50. The humidification system according to claim 49, characterized in that, The humidification system further includes a heater base configured to heat at least some of the contents of the humidification chamber.

51. The humidification system according to claim 49, wherein, The breathing circuit assembly includes a supply conduit, an inhalation conduit, and an exhalation conduit.

52. The humidification system according to claim 51, characterized in that, The breathing circuit assembly includes a Y-shaped connector configured to connect the inhalation conduit and the exhalation conduit.

53. The humidification system according to claim 52, wherein, The circuit end cap is sized and configured to receive the Y-shaped connector.

54. The humidification system according to claim 49, characterized in that, The humidification system further includes a separation tool for assisting in separating the body of the humidification chamber from the base.

55. The humidification system according to claim 54, wherein The separation tool is configured to engage with the removal assistance feature of the humidification chamber.

56. The humidification system according to claim 54, wherein, The separation tool is substantially flat.

57. The humidification system according to claim 56, wherein, The separation tool has a flat bottom region and an inclined top surface region.

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