Sound damping device for respiratory apparatus

Abstract

The invention relates to a sound damping device for a breathing apparatus and a breathing apparatus. In addition to the sound damping device, the breathing apparatus also comprises a breathing gas inlet, a breathing gas outlet and a breathing gas path formed between the breathing gas inlet and the breathing gas outlet, and the breathing gas path is provided with a blower. Wherein the blower is configured for conveying breathing gas from a breathing gas inlet to a breathing gas outlet such that the breathing gas path has a suction side and a pressure side, and wherein the sound damping device comprises a chamber and a tubular channel, the chamber is configured to be arranged on the pressure side between the blower and the breathing gas outlet in the breathing gas path, and the tubular channel is configured to fluidly connect the chamber to the breathing gas outlet.

Description

Technical Field

[0001] This invention relates to a device for damping sound. The device is configured for use in a breathing apparatus. Furthermore, this invention also relates to a breathing apparatus that includes a sound damping device. Background Technology

[0002] Respiratory devices are devices used to ventilate individuals who are breathing poorly, agitated, or at pause in breathing. They can be used at home or in clinical settings. Respiratory devices can support natural breathing and / or take over breathing. They can also affect a patient's breathing in other ways, such as within a framework of respiratory therapy, oxygen delivery, or cough support. Furthermore, respiratory devices can be used for diagnostic purposes.

[0003] Breathing devices typically have at least one breathing gas path, which includes an inlet, an outlet, and a breathing gas drive (blower) for delivering the breathing gas. To ensure the breathing device is not perceived as a disturbance, operating noise should be as low as possible. Operating noise is caused by sound waves, such as those generated by the blower, air passage, and cooling blower. Breathing devices known in the prior art are equipped with sound-absorbing foam to reduce operating noise. These foams are, for example, made of polyester-based polyurethane. For example, EP3708208B1 illustrates a breathing device with sound-absorbing foam. However, it has been found that some foams can have negative effects on patient health. Summary of the Invention

[0004] The objective of this invention is to provide a device for a respiratory apparatus that effectively suppresses sound and ensures the safe and efficient operation of the respiratory apparatus.

[0005] The task is solved by a sound damping device and a breathing apparatus according to a preferred embodiment of the invention. Extended solutions and advantageous designs are the subject of alternative technical solutions, and their features can be combined arbitrarily within the scope of technical feasibility. This also applies, in particular, to the scope of the various claims. The description, especially in conjunction with the accompanying drawings, further supplements and explains the features of the invention.

[0006] This invention relates to a device for damping sound, used in a breathing apparatus. The breathing apparatus, in addition to the device itself, includes a breathing gas inlet, a breathing gas outlet, and a breathing gas path configured between the breathing gas inlet and the breathing gas outlet, the breathing gas path having a blower configured to deliver breathing gas from the breathing gas inlet to the breathing gas outlet, thereby giving the breathing gas path a suction side and a pressure side. The device includes: a chamber configured to be arranged on the pressure side of the breathing gas path between the blower and the breathing gas outlet; and a tubular channel configured to fluidly connect the chamber to the breathing gas outlet.

[0007] "Respiratory equipment" can be understood as equipment used for breathing and / or anesthesia. Therefore, respiratory equipment can have respiratory and anesthetic functions, as well as combinations of these functions. "Breathing" can be understood as artificial respiration, respiratory support, respiratory therapy, respiratory diagnosis, cough support, oxygen therapy (such as high-flow therapy), inhalation anesthesia, and combinations of at least two of the above examples. Therefore, respiratory equipment can be used to breathe or assist breathing on an individual, and can also be used alternatively or additionally for anesthesia. For this purpose, respiratory equipment can also be operated with anesthetic gases, thereby being used for inhalation anesthesia.

[0008] Therefore, "respiratory equipment" can be understood as any device that supports an individual's natural breathing and / or takes over breathing and / or is used for respiratory therapy and / or for inhalation anesthesia and / or otherwise affects the breathing of a patient or user. For example, respiratory equipment can be clinical or home respiratory equipment, respiratory therapy equipment, CPAP equipment, APAP equipment or bilevel equipment, high-flow therapy equipment, anesthesia equipment, emergency breathing equipment, oxygen delivery equipment, diagnostic systems or cough treatment equipment or cough suppressants.

[0009] The breathing device may have a housing. The breathing gas inlet and breathing gas outlet of the breathing device may be arranged on and / or formed by the housing. A breathing gas path is formed between the breathing gas inlet and breathing gas outlet, and this breathing gas path is generally (at least largely) located inside the housing. The breathing gas path is configured and constructed to guide the breathing gas. "Breathing gas" can be understood as a gas or gas mixture to be inhaled and / or exhaled. For example, breathing gas can be ordinary breathing air from the environment, oxygen, or oxygen-rich breathing air. "Breathing gas" can also be understood as a gas mixture rich in at least one drug or anesthetic, thus the breathing gas can be used for therapeutic or anesthetic purposes.

[0010] The breathing gas path may include at least one breathing gas actuation device for guiding the breathing gas flow in at least one direction. For example, the breathing gas actuation device may be designed as a blower, particularly a radial or axial blower, a piston motor, a bellows, or a valve assembly. The breathing gas actuation device is preferably designed as a radial blower. The blower may have an intake port and a pressure port. In the case of a radial blower, the breathing gas can enter the blower axially through the intake port and then exit the blower through the pressure port.

[0011] In some embodiments, the breathing gas can be discharged from the blower again through a pressure fitting perpendicular to the axial direction. In some embodiments, the breathing gas can also be diverted in the pressure fitting and / or downstream of the pressure fitting along the flow direction. Thus, in a radial blower, the breathing gas can also enter the blower axially, be guided radially through the impeller, and then flow out of the blower axially again after diversion. For this purpose, the pressure fitting may have curvature and / or the blower may have guide vanes for diverting the breathing gas.

[0012] A blower typically includes at least one rotatably mounted impeller driven by a motor, which deflects breathing gas from axial to radial direction. This creates a breathing gas flow. To achieve breathing, the blower can rotate at speeds up to 60,000 revolutions per minute or even higher, thus establishing the necessary breathing gas pressure.

[0013] The blower divides the respiratory gas path into an suction side and a pressure side. The suction side is located upstream of the blower's suction connector. Respiratory gas is introduced into the respiratory gas path through the respiratory gas inlet and delivered to the blower on the suction side. Therefore, the suction side lies between the respiratory gas inlet and the blower's suction connector. The pressure side is located downstream of the blower's pressure connector. Respiratory gas can be delivered from the blower to the patient through the pressure side and the respiratory gas outlet. Therefore, the pressure side lies between the blower's pressure connector and the respiratory gas outlet.

[0014] The breathing device may also have multiple inlets through which other breathing gases, such as fresh gas, oxygen, gas mixtures, drugs, or anesthetics, can be introduced into the breathing gas pathway, either alternatively or additionally. Alternatively or additionally, the breathing device may also have multiple outlets. Breathing gas inlets and / or breathing gas outlets may be formed or include connectors for respectively excluding tubing or tubing systems or patient interfaces.

[0015] Breathing gas can be released from the breathing gas path through a breathing gas outlet and provided to the patient, for example, via a hose or hose system and / or via a patient interface. In the context of this invention, "patient interface" can be understood as any peripheral device designed to interact with a living organism. In particular, the patient interface is configured for use in conjunction with a respiratory device for breathing, treatment, and / or diagnosis. The patient interface can be designed as a breathing mask. Examples include, but are not limited to, nasal masks, nasal pad masks, nasal cannulas, or oxygen goggles, full-face masks, and endotracheal tubes or intubations.

[0016] Operating noise occurs during the operation of respiratory equipment, generated by components such as blowers, impellers, motors, air ducts, or cooling fans. If this operating noise is generated or present on the pressure side and therefore directly reaches the patient, the patient may experience significant disturbance. This invention particularly dampens noise on the pressure side.

[0017] In this invention, "sound damping" can generally be understood as reducing sound. Sound reduction can be achieved through damping and / or sound insulation and / or acoustic impedance and / or reflection and / or sound wave superposition (interference) and / or absorption. The term "sound damping" here refers to the broader concept of all physical effects used to reduce sound.

[0018] In this invention, sound is damped, particularly by acoustic impedance. "Acoustic impedance," especially acoustic flow impedance, refers to the resistance to sound propagation, such as the resistance in a pipe. Sound wave reflection occurs at the transition between regions of different acoustic impedances, thereby achieving a sound damping effect.

[0019] The device with chambers and channels according to this disclosure can significantly reduce operating noise from respiratory equipment. Since the chambers and channels can be arranged on the pressure side of the breathing gas path of the respiratory equipment, sound reaching the pressure side of the patient can be damped in particular.

[0020] "Channel" can be understood as a pipe, hose, or a combination of both. The channel can be rigid or at least partially flexible. The channel is designed as an elongated cavity with walls surrounding the interior. The channel has two openings on its longitudinal side through which breathing gas can enter and exit.

[0021] The channel is configured to receive and / or guide breathing gas. The channel has a length, height, and width. Typically, the length of the channel is several times its width and / or height. The height and width of the channel may be the same or slightly different. Breathing gas can be received and / or guided within the cavity of the channel. The breathing gas can be guided through the channel by the breathing gas drive mechanism of the breathing device. Here, the flow direction is generally aligned with the longitudinal direction of the channel. The cross-section of the channel is orthogonal to the flow direction.

[0022] A "chamber" can be understood as a region with a different geometry than a channel. Like a channel, the chamber is also constructed to receive and / or guide breathing gas. The chamber is designed as a cavity with walls surrounding its inner cavity. The chamber may have two openings through which breathing gas can enter or exit. The chamber may have chamber walls whose inner walls surround its inner cavity. Breathing gas can be received or guided within the inner cavity of the chamber. The chamber may also be formed at least partially by the breathing device itself, such as by the outer walls of the housing, other components of the breathing device, etc. The chamber has a length, height, and width. Unlike a channel, the length is generally not a multiple of the width and / or height. The cross-section of the chamber is orthogonal to the flow direction. The cross-section of the chamber is typically larger than the cross-section of the channel.

[0023] Therefore, the breathing gas path has different segments. On the suction side, the breathing gas flows from the breathing gas inlet to the blower, and on the pressure side, it flows from the blower to the breathing gas outlet. The blower can be understood as one segment of the breathing gas path. Other segments, particularly channels and chambers with different geometries and dimensions, can also be arranged on the suction and / or pressure sides. Preferably, one or more channels and / or chambers are formed on the pressure side. In some embodiments, it is also contemplated that chambers and / or channels be arranged on the suction side.

[0024] In one embodiment, the device can employ a modular structure. One module can correspond to one segment. Thus, one module may include a chamber, another module may include channels, etc. Modules can be designed such that they are arranged sequentially in different rows and columns. For example, these modules can be designed as a plug-in system, allowing for arbitrary order of modules. This provides the advantage of a particularly flexible system. The modules can be arranged such that a chamber follows a pressure pipe along the flow direction, and a channel follows a chamber. Other channels and chambers may also follow.

[0025] Due to the different sections (modules), the cross-section and / or shape of the breathing gas path undergoes at least one, preferably multiple, change. The geometry of the breathing gas path changes at least once, preferably multiple times. Therefore, the cross-section of the breathing gas path can decrease or increase at least once, preferably multiple times. Here, it is preferred if the cross-section of the breathing gas path decreases or increases abruptly or abruptly at the transition between two sections (blower, chamber, channel). In a preferred embodiment, the transition between the two sections is abrupt, thus resulting in a noticeable geometric discontinuity.

[0026] In one embodiment, the cross-section of the blower, particularly the cross-section of the pressure connector, may be smaller than the cross-section of the chamber. Conversely, the cross-section of the chamber may be larger than the cross-section of the passage. The cross-sections of the pressure connector and the passage may be the same, or preferably different.

[0027] To achieve sound damping, at least one cross-sectional jump is required, preferably two, and especially three or more. The more cross-sectional jumps in the breathing gas path, the greater the sound damping effect. However, it should be noted that the device should be constructed as small as possible because different sections and / or cross-sections will introduce some pressure loss. To compensate for this, the blower speed can be adaptively adjusted.

[0028] According to one embodiment, the blower may have a first acoustic impedance, the chamber may have a second acoustic impedance, and the channel may have a third acoustic impedance, wherein these acoustic impedances are different from each other, thereby damping the sound generated by the blower.

[0029] The device is configured such that the impedance between the blower and the chamber preferably changes abruptly. Alternatively or additionally, the impedance between the chamber and the channel may also change abruptly. Alternatively or additionally, the impedance between the blower and the duct may also change abruptly. This can be achieved, as described above, through different geometries and / or cross-sections.

[0030] According to one embodiment, the channel may include a channel wall having an inner wall surrounding an inner cavity of the channel. The inner wall of the channel may be of a constant design. Alternatively or additionally, the chamber may include a chamber wall having an inner wall surrounding an inner cavity of the chamber. The inner wall of the chamber may also be of a constant design.

[0031] "Constant" can be understood as the channel walls and / or chamber walls being continuous and uniform, without variation or breakage. Constant walls are continuous (without gaps) and are uniformly continuous within at least one section.

[0032] In some embodiments, the channel walls and / or chamber walls may also be formed at least partially by the breathing device itself. For example, portions such as the housing, the outer walls of other components of the breathing device, etc., may at least partially form chamber walls or channel walls. However, it has proven advantageous that the chamber walls and channel walls remain constant, preferably consisting of separate walls. The channel and chamber may share said walls at least sectionally. This may mean that, in the operating state of the device, i.e., when the modules are adjacent to each other, the channel walls also form the boundaries of the chambers, and vice versa.

[0033] According to one embodiment, the device may include a second chamber disposed between the channel and the breathing gas outlet. The second chamber may be configured to introduce further geometry and / or further cross-sectional changes to the breathing gas path. The second chamber is preferably configured to cause abrupt increases or decreases in the cross-section of the breathing gas path. The second chamber can further abruptly change the cross-section of the breathing gas path, thereby improving the sound damping effect of the device. Corresponding to the first chamber, the second chamber may include a chamber wall with an inner wall surrounding the inner cavity of the second chamber. The inner wall of the second chamber may be of a constant design.

[0034] According to one embodiment, the second chamber may have a fourth acoustic impedance different from the first and / or second and / or third acoustic impedances, thereby additionally damping the sound produced by the blower. The second chamber may be configured such that the impedance between the second chamber and the channel and / or the chamber and / or the blower changes abruptly. Therefore, further sound damping can be achieved.

[0035] According to one embodiment, the channel and / or chamber and / or second chamber can be configured as cavities in a non-porous material, particularly a non-porous plastic. This means that the channel walls and / or chamber walls comprise a non-porous material. Preferably, at least the inner walls of the channel and the inner walls of the chamber are made of a non-porous material.

[0036] "Non-porous" can be understood as the absence of (intentional) air inclusions, pores, or similar substances in the material. Non-porous materials preferably possess only the characteristics of a solid polymeric state. For example, the material can be or includes metals and / or non-porous polymeric materials (plastics). For example, the device can be manufactured by casting, injection molding, etc.

[0037] The material may include at least one of the following metallic materials: iron; steel, especially stainless steel; aluminum; copper or other suitable metallic materials. Alternatively or additionally, the material may also include at least one of the following polymeric materials: silicone, natural rubber, polyvinyl chloride (PVC), polymethyl methacrylate (PMMA) or other suitable plastics.

[0038] The density of metallic materials can range from 2000 to 10000 kg / m³. 3 Preferred weight is 2700 to 8950 kg / m³. 3 The hardness of metallic materials can range from 20 to 120 HB. The tensile strength of metallic materials ranges from 60 to 950 N / mm². 2 .

[0039] The density of polymer materials can range from 800 to 1500 kg / m³. 3 Preferred weight is 920 to 1400 kg / m³. 3 The Shore A hardness of polymer materials can range from 20 to 100 Shore A. The tensile strength of polymer materials ranges from 1 to 80 N / mm². 2 .

[0040] What has proven particularly advantageous is that the breathing gas pathway is formed essentially without foam and / or lint. Therefore, the design of the breathing gas pathway is especially safe for patients because harmful substances do not form within the pathway and / or are released into the breathing gas. Furthermore, if the breathing gas pathway is made of a non-porous material, cleaning, disinfection, or sterilization is simpler and safer because non-porous materials are not susceptible to erosion by cleaning agents like foam materials.

[0041] Preferably, especially the channel and / or chamber and / or second chamber, and more preferably, all components of the breathing device along the breathing gas path can be constructed without foam and / or with velour.

[0042] However, filters, such as pleated filters, or filtration systems consisting of multiple filters in series and / or cloths, can also be placed upstream of the breathing gas path. The filters and / or cloths can be placed in or at the breathing gas inlet of the breathing device. The filters and / or cloths are replaceable. The filters and / or cloths can be configured to filter the breathing gas flowing into the breathing gas path through the breathing gas inlet. The filters and / or cloths can be configured to filter out any solid particles that may be present in the breathing gas.

[0043] According to one embodiment, the channel may have a cross-section orthogonal to its longitudinal direction, which may be circular or angular. The channel can have any cross-section. According to this disclosure, the cross-section may be circular or angular, such as circular, elliptical, quadrangular, rectangular, or polygonal. However, other cross-sections may also be used. For example, the cross-section of the channel may also be at least partially trough-shaped, sickle-shaped, cross-shaped, star-shaped, trapezoidal, X-shaped, L-shaped, U-shaped, V-shaped, T-shaped, elliptical, or similar shapes. The cross-section may be constant or may vary with its longitudinal extension. For example, in some embodiments, the cross-section may change its geometry or increase and / or decrease its perimeter. The channel preferably has a circular or elliptical cross-section because a circular or elliptical cross-section has optimal flow characteristics.

[0044] In a preferred embodiment, the cross-section remains constant along the longitudinal direction of the channel. However, in some embodiments, it is also conceivable that the channel may increase and / or decrease as it extends longitudinally.

[0045] According to one embodiment, the channel, when viewed in its longitudinal direction, may be at least partially straight and / or at least partially curved. In a simple embodiment, the channel is straight in its longitudinal direction. However, it is advantageous if the channel is at least partially curved. Therefore, the device can be designed to be particularly space-efficient. Furthermore, the curved channel can deflect breathing gas, thereby having a positive effect on sound suppression.

[0046] According to one embodiment, the channel may include at least one straight section and at least one curved section, wherein the curved section has at least one bend, causing the channel to be curved in its longitudinal direction. According to one embodiment, the bend may be round or angular. The bend is at least 10°, preferably at least 45°. The bend is particularly preferably between 45° and 180°. According to one embodiment, the channel may be U-shaped and / or L-shaped at at least one point, preferably at least two points, in its longitudinal direction. The U-shaped bend allows the channel to bend 180° at at least one point. The L-shaped bend allows the channel to bend 90° at at least one point. These bends may be round or angular.

[0047] According to one embodiment, the channel may include a first straight segment, a second straight segment, and a curved segment connecting the first and second straight segments, wherein the curved segment has a U-shaped bend, such that the longitudinal axes of the first and second straight segments are parallel to each other. This embodiment's design can save significant space.

[0048] According to one embodiment, the channel may include a first bend and a second bend, as well as a straight section connecting the first bend and the second bend.

[0049] According to one embodiment, the channel may include multiple straight and curved sections, such that the channel has a meandering orientation at least segmentally in its longitudinal direction. "Meandering" can be understood as the channel having a sequence of multiple bends. These can be arranged regularly or irregularly, allowing the channel to be configured symmetrically or asymmetrically. The meandering orientation provides the advantage of saving space while maximizing the length of the channel. The bends can extend in one plane, thus making the channel two-dimensionally curved. In some embodiments, the channel can also be curved in another plane, resulting in one or more three-dimensional bends. The bends of the channel can extend in any conceivable direction. The bends of the channel can make the channel symmetrical or asymmetrical. The channel can have any spatial layout. However, it is advantageous if the channel does not exceed or falls below a certain volume and / or a certain size.

[0050] According to one embodiment, the channel may consist of a plurality of straight and curved sections and be arranged such that the channel at least partially forms a first chamber, in such a way that the walls of the channel at least regionally form the walls of the chamber.

[0051] According to one embodiment, the channel can be arranged in a U-shape around the chamber. The channel can also consist only of bends, thus forming an elliptical, circular, or spiral shape. Optionally, the channel formed in this way can also wrap around the chamber. This can be a particularly space-saving embodiment.

[0052] According to one embodiment, the channel has a volume of 100 cm³ to 10000 cm³, preferably 500 cm³ to 5000 cm³. It has proven particularly advantageous that the channel has a volume of 800 to 4500 cm³. To achieve this volume, the channel has a specific length and diameter. According to one embodiment, the channel can have a length of 1 mm to 1000 mm, preferably 10 mm to 500 mm. A length of 10 to 350 mm has proven particularly advantageous. Furthermore, the channel can have a diameter of 1 mm to 30 mm, preferably 5 mm to 20 mm, and particularly preferably 10 mm to 15 mm. The length of the channel can significantly reduce acoustic radiation on the pressure side.

[0053] According to one embodiment, the chamber and / or the second chamber may have a volume of 2000 cm³-40000 cm³, preferably 4000 cm³-20000 cm³, and particularly preferably 10000-15000 cm³. In particular, when the dimensions of the chamber or the second chamber are as described above, a sound damping effect is produced. According to one embodiment, the chamber and / or the second chamber has a depth of 50 mm-120 mm, preferably 80 mm-100 mm and / or a height of 10 mm-70 mm, preferably 20 mm-40 mm and / or a width of 10 mm-100 mm, preferably 40 mm-60 mm.

[0054] The depth of the chamber should be understood as the expansion of the chamber volume in the flow direction. The width and height of the chamber determine its cross-section, which is perpendicular to the depth and therefore also perpendicular to the flow direction of the breathing gas.

[0055] The cross-section of the first and second chambers can be of any geometry or cross-section. According to this disclosure, it can be angular, particularly rectangular. However, it does not have to be angular; according to one embodiment of this disclosure, it can also be circular or elliptical. According to this disclosure, both elongated and shortened embodiments of the chambers are possible.

[0056] However, it has been found that a certain depth of the chamber (as defined above) is advantageous. If the depth is too small, the incoming respiratory airflow will directly impact the opposite wall of the chamber, resulting in flow noise.

[0057] According to one embodiment, the ratio of the volume of the channel to the volume of the chamber and / or the second chamber is at least 1:2, preferably at least 1:4, and particularly preferably 1:10.

[0058] According to one embodiment, the chamber and the second chamber can have the same design. According to one embodiment, the chamber and the second chamber can have different dimensions, thereby making their acoustic impedances different from each other. According to one embodiment, the dimensions of the second chamber and the channel can be different, thereby making their acoustic impedances different from each other.

[0059] "Size" can be understood as geometric shape and / or size and / or volume and / or length / height / depth dimensions. For example, it is conceivable that the first chamber and the second chamber have different sizes, and therefore different volumes. In some embodiments, the first chamber and the second chamber may also have the same volume, but different length and / or height and / or depth dimensions. It is also conceivable that the first chamber and the second chamber have different geometries, such that the first chamber is, for example, square or polygonal and the second chamber is, for example, circular or elliptical, or vice versa. These geometries can be configured symmetrically or asymmetrically. For example, it is also conceivable that the first chamber is symmetrical and the second chamber is asymmetrical, or vice versa.

[0060] Because the two chambers are of different sizes, they can be detuned. This may mean that there is no perfectly suitable acoustic configuration for either the first or second chamber. Therefore, the first and / or second chamber can be configured such that acoustic waves whose lengths perfectly match the geometry of the chambers cannot pass through them. This allows for sound damping.

[0061] According to one embodiment, the device may include a first connector and / or a second connector for connecting the device to the breathing gas path of a respiratory device. The breathing gas path may be designed to guide breathing gas. Breathing gas can flow within the respiratory device along the following breathing gas path: Breathing gas enters the breathing gas path through a breathing gas inlet. Breathing gas can enter a blower from the breathing gas inlet through a suction-side section of the breathing gas path and a suction connector. The blower provides delivery energy to the breathing gas and delivers the breathing gas to the pressure-side section of the breathing gas path through a pressure connector. Here, breathing gas enters the device through the first connector. Breathing gas first enters a chamber and flows through that chamber. Breathing gas enters a channel from the chamber and flows longitudinally through the channel. Breathing gas can exit the device from the channel through the first connector. Then, breathing gas can be delivered out of the respiratory device through a breathing gas outlet and delivered to a patient (not shown).

[0062] Breathing equipment may include a humidifier configured to humidify and / or heat breathing gases with a liquid. For this purpose, the humidifier may include a reservoir. Furthermore, it may include a heating device for heating the water, such as a heating rod. Additionally, it may include a device for measuring the liquid temperature, such as an immersion tube. Therefore, the humidifier can be configured to provide heated water through which breathing gases can be guided, thereby achieving the purpose of heating and / or humidification.

[0063] In some embodiments, the humidifier may include at least part of a means for damping sound. For example, a chamber and / or a second chamber and / or a channel may be arranged in or formed by the humidifier.

[0064] Transitions exist between the blower and the chamber and / or between the chamber and the passage and / or between the passage and the second chamber. These transitions can be configured as openings in the wall of at least one corresponding element. In this way, the elements can be simply adjacent to each other, and breathing gas can flow from one element to the next. In some embodiments, it is also conceivable that one element protrudes into the next element.

[0065] For example, the chamber can be directly connected to the pressure pipe of the blower. For example, the pressure pipe can be directly adjacent to an opening in the chamber wall. In some embodiments, the pressure pipe may also be introduced into the chamber wall or pass through the chamber wall and extend into the chamber. Preferably, there are no additional elements (chambers, channels, or other cavities) between the blower and the chamber.

[0066] The transition between the chamber or second chamber and the channel can be similar. The channel can be directly connected to the chamber or second chamber. In some embodiments, the channel may also be introduced into or pass through the wall of the chamber or second chamber and extend into the chamber.

[0067] The present invention also relates to a breathing device. The breathing device has a breathing gas inlet, a breathing gas outlet, and a breathing gas path formed between the breathing gas inlet and the breathing gas outlet. The breathing gas path includes a blower configured to deliver breathing gas from the breathing gas inlet to the breathing gas outlet, thereby giving the breathing gas path a suction side and a pressure side. The suction side is formed between the breathing gas inlet and the blower inlet, and the pressure side is formed between the blower outlet and the breathing gas outlet. The breathing device includes the previously described means for damping sound, wherein the means is arranged in the breathing gas path between the blower outlet and the breathing gas outlet and is connected to the breathing gas path via a first connector and a second connector. Attached Figure Description

[0068] Embodiments of the present invention will now be described with reference to the accompanying drawings. The present invention is not limited to the embodiments shown in the drawings. Neither the specification nor the drawings should be construed as limiting the scope of the invention.

[0069] Figure 1 A schematic diagram of a breathing device 1 with a means 10 according to an embodiment of the present invention is shown.

[0070] Figure 2 An apparatus 10 according to a first embodiment of the present invention is shown.

[0071] Figure 3 An exemplary embodiment of channel 13 according to the present invention is shown.

[0072] Figure 4 The apparatus 10 according to a second embodiment of the present invention is shown.

[0073] Figure 5 The apparatus 10 according to a third embodiment of the present invention is shown.

[0074] Figure 6 The apparatus 10 according to a fourth embodiment of the present invention is shown.

[0075] These figures are purely schematic and are sometimes not drawn to scale. If the same reference numerals are used in different figures, then these reference numerals represent the same feature or features that have the same effect. Detailed Implementation

[0076] Figure 1 A schematic diagram of a breathing device 1 with a means 10 according to an embodiment of the present invention is shown. The breathing device 1 includes a breathing gas inlet 2, a breathing gas outlet 4, and a breathing gas path 3 formed between the breathing gas inlet 2 and the breathing gas outlet 4. The breathing gas path 3 is designed for receiving and / or guiding and / or directing breathing gas.

[0077] As shown in the figure, the breathing device 1 may include a housing 32. A breathing gas inlet 2 and a breathing gas outlet 4 may be arranged on or constituted by the housing 32. The breathing device 1 may also have multiple inlets 2 and / or outlets 4 (not shown). As shown, the breathing gas inlet 2 and the breathing gas outlet 4 may be opposite each other within the housing 32. However, the breathing gas inlet 2 and the breathing gas outlet 4 do not necessarily have to be opposite each other, but can be located at any suitable position on the device. Breathing gas can enter the breathing gas path 3 through the breathing gas inlet 2. Breathing gas can be released from the breathing gas path through the breathing gas outlet 4.

[0078] As shown in the figure, at least one blower 5 can be arranged in or on the breathing gas path 3, dividing the breathing gas path 3 into a suction side 6 and a pressure side 7. The blower 5 can be designed as an axial blower, or, as shown in the figure, preferably as a radial blower. The suction side 6 is located between the breathing gas inlet 2 and the blower inlet 8. The blower inlet 8 can be designed as a suction connector. The pressure side 7 is located between the blower outlet 9 and the breathing gas outlet 4. The blower outlet 9 can be designed as a pressure connector. Due to its geometry, the blower 5 can have a first acoustic impedance 14. The blower 5 also includes a device 10 for damping sound. Due to its geometry, the device 10 can have at least one other acoustic impedance 15, 16, 17 different from the first acoustic impedance 14.

[0079] The device 10 is arranged on the pressure side 7 of the breathing gas path 3. Alternatively or additionally, the device 10 may also be arranged on the suction side 6 of the breathing gas path 3. The device 10 may include a first connector 30 and / or a second connector 31 to connect the device 10 to the breathing gas path 3 of the breathing device 1. The device 10 then forms the breathing gas path 3 in at least some areas, preferably the breathing gas path 3 on the pressure side 7.

[0080] Here, the first connector 30 can enable a direct or indirect connection between the device 10 and the blower 5. As shown in the figure, there can be connecting pipes 3 and 7 between the pressure pipe 9 of the blower 5 and the first connector 30 of the device 10, thereby indirectly connecting the device 10 to the blower 3. In some embodiments, the pressure pipe 9 can also lead directly to the first connector 30 or have an opening at the first connector 30, thereby allowing the device 10 to be directly connected to the blower 5. In this way, breathing gas can directly enter the device 10 (not shown) from the pressure pipe 9.

[0081] The second connector 31 allows the device 10 to be connected indirectly or directly to the breathing gas outlet 4 of the blower 1. As shown in the figure, connecting pipes 3 and 7 may be present between the second connector 31 of the device 10 and the breathing gas outlet 4, thereby indirectly connecting the device 10 to the breathing gas outlet 4. In some embodiments, the second connector 31 may also lead directly to the breathing gas outlet 4, thereby directly connecting the device 10 to the breathing gas outlet 4. In this way, breathing gas can be directly discharged from the device 10 by the breathing device 1 (not shown).

[0082] The device 10 includes a chamber 11 disposed between the blower outlet 9 and the breathing gas outlet 4. The chamber 11 may have a second acoustic impedance 15. The geometry and cross-section of the chamber 11 differ from the geometry and cross-section of the blower 5. Therefore, the first acoustic impedance 14 may differ from the second acoustic impedance 15, thereby damping the sound generated by the blower 5.

[0083] Furthermore, the device 10 also includes a channel 13 disposed between the chamber 11 and the breathing gas outlet 4. The diameter of the channel 13 is smaller than that of the chamber 11. The channel 13 may have a third acoustic impedance 16. Because the geometry and cross-section of the channel 13 differ from the geometry and cross-section of the chamber 11 and / or the blower 5, the third acoustic impedance 16 differs from the first acoustic impedance 14 and / or the second acoustic impedance 15, thereby additionally damping the sound generated by the blower 5.

[0084] Breathing gas can flow within the breathing device 1 along the following breathing gas path 3: Breathing gas enters the breathing gas path 3 through the breathing gas inlet 2. The breathing gas enters the suction side 6 of the breathing gas path 3 from the breathing gas inlet 2 and enters the blower 5 through the suction connector 8. The blower 5 provides delivery energy for the breathing gas and delivers the breathing gas to the pressure side 7 of the breathing gas path 3 through the pressure connector 9. Here, the breathing gas enters the device 10. First, the breathing gas enters the chamber 11 and flows through it. The breathing gas enters the channel 13 from the chamber 11 and flows longitudinally through the channel. The breathing gas can flow out of the device 10 through the channel 13 and exit the breathing device 1 through the breathing gas outlet 4 and be delivered to a patient (not shown).

[0085] At the transition from blower 5 to device 10, and more precisely, from blower 5 to chamber 11, the geometry and / or cross-section of the breathing gas path 3 preferably changes abruptly. At the transition from chamber 11 to channel 13, the geometry and / or cross-section of the breathing gas path 3 preferably changes abruptly again. This will cause sound reflection, thereby damping the sound generated by the breathing device 1. For this purpose, the ratio of the volume of channel 13 to the volume of chamber 11 can be at least 1:2, preferably at least 1:4, and particularly preferably 1:10.

[0086] Figure 2 An apparatus 10 according to a first embodiment of the present invention is shown. The apparatus 10 includes a chamber 11 and a channel 13. Figure 2 The device can have a modular structure. Here, one module may correspond to a segment 11, 12 of device 10. The first module may include a chamber 11, and another module may include a channel 13. Here, these modules can be designed as a plug-in system, so the order of the modules can be changed. In some embodiments, multiple chambers 11 and channels 13 may also be arranged sequentially.

[0087] from Figure 2 As can be seen, chamber 11 may include chamber wall 28, which has an inner wall 29 surrounding the interior of chamber 11. The inner wall 29 is preferably designed to be constant. The inner wall 29 can be uniformly designed, without breaks, corners, edges, gaps, etc. The inner wall 29 is preferably uniformly smooth. This allows for particularly uniform, preferably turbulent-free laminar flow. Thus, a uniform flow pattern is formed in chamber 11, thereby positively influencing the pressure build-up of the breathing gas.

[0088] Breathing gas can enter the inner cavity of chamber 11 through the first connector 30 and flow through the chamber. Chamber 11 has a depth T, a height H, and a width not shown here. The depth T of chamber 11 cannot be too small, otherwise the incoming airflow will directly impact the opposite wall in the form of a free jet. The opposite wall is preferably a smooth wall without sharp edges, etc., to avoid generating flow noise.

[0089] from Figure 2 It can also be seen that the channel 13 includes a channel wall 18 having an inner wall 19 surrounding the interior of the channel 13. The inner wall 19 is preferably designed to be constant. Viewed longitudinally, the channel 13 can be at least partially straight. The channel 13 can also be at least partially curved. Therefore, the device 10 can include a channel 13 comprising at least one straight section 21, 22 and at least one curved section 25, 26. For this purpose, the curved sections 25, 26 have at least one bend 24, so that the channel 13 is curved along its longitudinal direction.

[0090] exist Figure 2 In this embodiment, the channel 13 has a first bend 25 and a second bend 26, as well as a straight section 21 connecting the first bend 25 and the second bend 26. This embodiment has the advantage of being particularly space-saving. The two bends 25 and 26 can also deflect the breathing gas, thereby additionally suppressing sound. As shown, the bend 24 can be configured, for example, at a right angle. Therefore, the design of the bend 24 can deflect the breathing gas by 90° in each of the bends 25 and 26. Other angles for the bend 24 are also conceivable.

[0091] Figure 3 An exemplary embodiment of the channel 13 according to the present invention is shown. From Figure 3 As can be seen, channel 13 can have various shapes in its longitudinal direction. In the simplest embodiment, channel 13 can be straight (not shown).

[0092] like Figure 3 As shown in Figure AE, channel 13 may preferably have at least one bend 24. The bend 24 may be circular. Figure 3 AC, 3E), or it can be angular ( Figure 3 D).

[0093] For example, channel 13 may have a U-shaped bend at at least one point, which bends the channel by 180°. Channel 13 may also have an L-shaped bend at at least one point, which bends the channel by 90°. This bend(s) may be round or angular.

[0094] In principle, any angle of the channel 13 in two-dimensional or three-dimensional space can be achieved by the bend 24. However, in a preferred embodiment, the angle of the bend 24 is at least 45°. The bend 24 allows the channel 13 to bend at an angle preferably between 45° and 180° in its longitudinal direction.

[0095] Figure 3A illustrates one embodiment of channel 13, which has a first bend 25 and a second bend 26. The two bends 25 and 26 are interconnected by a straight section 21. In this specific embodiment, the first bend 25 and the second bend each have a 90° L-shaped bend 24. The two bends 24 are formed in opposite directions.

[0096] Figure 3 B illustrates one embodiment of channel 13, which has four bends 25, 26, 27... which can be interconnected by straight segments 21, 22, 23 respectively. For example, this embodiment has three straight segments 21, 22, 23. The longitudinal lengths of straight segments 21, 22, 23 can be the same and / or different.

[0097] In this specific embodiment, the first bend 25 and the fourth bend, which is the last bend, each have a 90° L-shaped bend 24. The second bend 26 and the third bend 27 each have a 180° U-shaped bend 24. This design of the bends 24 allows the longitudinal axes of the straight segments 21, 22, and 23 to be arranged parallel to each other. This has the advantage of saving considerable space.

[0098] Figure 3 C and Figure 3 D illustrates one embodiment of channel 13, which has multiple bends 25, 26, 27... and multiple straight sections 21, 22, 23... Therefore, channel 13 is longitudinally meandering. As shown, the longitudinal axes of the straight sections 21, 22, 23 can be parallel to each other. Other arrangements are also conceivable.

[0099] The number of straight and curved sections is variable. What applies here is that the more the breathing gas is deflected, the lower the noise level of device 10. However, multiple deflections of the breathing gas can also lead to pressure loss. Therefore, the advantages and disadvantages of deflection should be weighed when designing channel 13. The embodiment shown here has proven to be an ideal design, ensuring optimal sound suppression and sufficient pressure build-up.

[0100] Figure 3 E illustrates an embodiment of a channel 13 having two bends 25 and 26. The bends 25 and 26 have U-shaped bends 24. Furthermore, this embodiment also has three straight sections 21, 22, and 23. The bends 25 and 26 are interconnected via the straight sections 21, 22, and 23.

[0101] In alternative embodiments, channel 13 may also be configured to be completely curved, and for example, spirally wound (not shown). In other embodiments not shown, any arrangement of 2D and 3D bends 24 may also be present, thereby achieving a symmetrical or asymmetrical arrangement of channel 13.

[0102] Figure 4The apparatus 10 according to a second embodiment of the present invention is shown. Figure 5 The apparatus 10 according to a third embodiment of the present invention is shown. As shown in the figure, in addition to the chamber 11 and the channel 13, the apparatus 10 may also include a second chamber 12. The second chamber 12 is preferably arranged between the channel 13 and the breathing gas outlet 4. The second chamber 12 may have a fourth acoustic impedance 17 that is different from the first acoustic impedance 14 and / or the second acoustic impedance 15 and / or the third acoustic impedance 16. In this way, the sound generated by the blower 5 can be additionally damped.

[0103] like Figure 4 and Figure 5 As shown, chamber 11 and the second chamber 12 may have the same size and geometry. However, in some embodiments, it may be advantageous for chamber 11 and the second chamber 12 to have different sizes and / or geometries (not shown in the figure). This ensures that the second acoustic impedance 15 (of the chamber) and the fourth acoustic impedance 17 (of the second chamber) are different from each other.

[0104] Chamber 11 and / or the second chamber 12 may be a humidifier or include a humidifier (not shown). The humidifier may be configured to humidify and / or heat the breathing gas with a liquid.

[0105] Figure 4 As shown, channel 13 may include a first straight segment 21, a second straight segment 22, and a third straight segment 23. Furthermore, channel 13 also includes a first bend 25 that fluidly connects the first straight segment 21 and the second straight segment 22. Additionally, channel 13 includes a second bend 26 that fluidly connects the second straight segment 22 and the third straight segment 23. As shown, bends 25 and 26 may have a bend 24 such that the longitudinal axis of the first straight segment 21 is parallel to the longitudinal axis of the second straight segment 22, and / or the longitudinal axis of the second straight segment 22 is parallel to the longitudinal axis of the third straight segment 23.

[0106] Therefore, channel 13 can be bent in a U-shape at least once in its longitudinal direction (not shown in the figure), preferably at least twice, such as Figure 4 As shown. In other preferred embodiments, the channel may also bend in a U-shape at least four times or more (not shown).

[0107] Figure 5 As shown, channel 13 has multiple straight segments 21, 22, 23... and curved segments 25, 26, 27..., thus channel 13 is meandering in its longitudinal direction. As shown, the straight segments 21, 22, 23... may have parallel extending longitudinal axes. The bends 24 of the curved segments 25, 26, 27... may have the same and / or different angles. Figure 5In a specific embodiment, the first bend 24 and the last bend 24 each have a 90° L-shaped bend 24. The remaining bends 26, 27... each have a U-shaped bend, so the longitudinal axes of the straight segments 21, 22, 23 are parallel to each other.

[0108] Figure 6 A device 10 according to a fourth embodiment of the present invention is shown, wherein Figure 6 The views in A and 6B show their respective interior views after passing through a longitudinal section of the device 10.

[0109] As can be seen from this specific embodiment, the channel 13 has multiple straight sections 21, 22, 23... and curved sections 25, 26, 27... It can also be seen from the figure that the channel 13 and the chamber 11 can be formed by the same walls 18, 28 in at least certain areas. The channel 13 can be arranged such that it at least partially surrounds and at least partially encloses the inner cavity of the first chamber 11. The channel 13 can be arc-shaped, so that it is U-shaped overall around the chamber 11. In an alternative embodiment (not shown here), the channel may also include only curved sections, so that it is constructed, for example, elliptical, circular, or spiral, and, for example, surrounds the chamber. The advantage of this design is that it is particularly space-saving.

[0110] Breathing gas can enter chamber 11 through connector 30. Breathing gas can then enter channel 13 from this chamber, where it can be deflected by 90°. Effective sound damping can be achieved by suddenly decreasing or increasing the cross-section of the breathing gas path from connector 30 to chamber 11 and from chamber 11 to channel 13. The deflection of the breathing gas also contributes to sound damping.

[0111] Breathable gas can flow directly from channel 13 to connector 31. A second chamber 12 (not shown) may also be considered downstream of channel 13. In some embodiments, this second chamber may be located within a humidifier. Figure 2 , Figure 4 , Figure 5 and Figure 6 Embodiments are shown with transitions between chambers and channels and / or between channels and second chambers, these transitions being constructed as simple openings in the walls. Elements such as chambers, channels, and second chambers are adjacent to each other, allowing breathing gas to flow from one element to the next. In alternative embodiments, it is also conceivable that one element extends into the next. In this case, the channel may be introduced into or through the wall of a chamber or second chamber and extend into the chamber (not shown).

[0112] As shown in the figure, the device may include connectors 30 and 31 for connecting the device to the breathing gas path 3 of the breathing device. The device may be directly or indirectly connected to the pressure port of the breathing device via an upstream first connector. The device may be indirectly or directly connected to the breathing gas outlet of the breathing device via a downstream second connector. As shown in the figure, the first and / or second connectors may be designed as pipes to which various components of the breathing device can be connected. In some embodiments, the connectors may also be designed as simple openings (not shown). For example, the pressure port may be directly adjacent to an opening in the chamber wall, or it may extend to or through the chamber wall. In some embodiments, the pressure port may extend at least partially into the chamber. Furthermore, the passage or second chamber may have an opening that is directly or indirectly connected to or forms the breathing gas outlet of the breathing device.

[0113] Although the invention has been described in detail with reference to embodiments, those skilled in the art will understand that the invention is not limited to these embodiments. Rather, modifications may be made without departing from the scope of the appended claims, thereby omitting individual features or implementing different combinations of said individual features. This disclosure includes all combinations of the described individual features.

[0114] List of reference numerals

[0115] 1. Respiratory equipment

[0116] 2. Breathing gas inlet

[0117] 3. Respiratory gas pathway

[0118] 4 Breathing gas outlet

[0119] 5. Blower (breathing gas driven device)

[0120] 6 suction side

[0121] 7. Pressure side

[0122] 8. Blower inlet (suction connection)

[0123] 9. Blower outlet (pressure connection)

[0124] 10. Devices for damping sound

[0125] 11 chambers

[0126] 12 Second Chamber

[0127] 13 channels

[0128] 14 First Acoustic Impedance

[0129] 15 Second Acoustic Impedance

[0130] 16 Third Acoustic Impedance

[0131] 17. Fourth Acoustic Impedance

[0132] 18 Channel Walls

[0133] 19 Inner Wall

[0134] 20 Materials

[0135] 21 First straight paragraph

[0136] 22 Second straight section

[0137] 23 Third straight section

[0138] 24. Bend

[0139] 25 First bend

[0140] 26 Second bend

[0141] 27 Third bend

[0142] 28 chamber wall

[0143] 29 Chamber inner wall

[0144] 30 First Connector

[0145] 31 Second connector

[0146] 32. Shell.

Claims

1. A device (10) for damping sound, used in a breathing device (1), wherein, The breathing device (1), in addition to the apparatus (10), also includes a breathing gas inlet (2), a breathing gas outlet (4), and a breathing gas path (3) constructed between the breathing gas inlet (2) and the breathing gas outlet (4), the breathing gas path having a blower (5), wherein the blower (5) is configured to deliver breathing gas from the breathing gas inlet (2) to the breathing gas outlet (4), such that the breathing gas path (3) has a suction side (6) and a pressure side (7), wherein the apparatus (10) includes: - Chamber (11), which is configured to be arranged in the breathing gas path (3) on the pressure side (7) between the blower (5) and the breathing gas outlet (4); - A tubular channel (13) configured to fluidly connect a chamber (11) to a breathing gas outlet (4).

2. The apparatus (10) according to claim 1, wherein, The blower (5) has a first acoustic impedance (14), the chamber (11) has a second acoustic impedance (15), and the channel (13) has a third acoustic impedance (16), wherein these acoustic impedances (14, 15, 16) are different from each other, thereby damping the sound generated by the blower (5).

3. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) is formed, at least partially straight and / or at least partially curved, when viewed in its longitudinal direction.

4. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) includes at least one straight section (21, 22, 23...) and at least one curved section (25, 26, 27...), wherein the curved section (25, 26, 27...) has at least one bend (24), thereby causing the channel (13) to be curved in its longitudinal direction.

5. The apparatus (10) according to claim 4, wherein, The curved portion (24) is circular or angular in shape, and / or the curved portion (24) is at least 10°, preferably at least 45°, and particularly preferably between 45° and 180°.

6. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) is U-shaped and / or L-shaped in its longitudinal direction at at least one location, preferably at at least two locations.

7. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) includes a first straight segment (21), a second straight segment (22) and a curved segment (25) connecting the first straight segment (21) and the second straight segment (22), wherein the curved segment (25) has a U-shaped bend (24) such that the longitudinal axes of the first straight segment (21) and the second straight segment (22) are parallel to each other.

8. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) includes a first bend (25) and a second bend (26) as well as a straight section (21) connecting the first bend (25) and the second bend (26).

9. The apparatus (10) according to any one of the preceding claims, wherein, The passage (13) includes multiple straight sections (21, 22, 23...) and curved sections (25, 26, 27...), thereby making the passage (13) meandering in at least sections in its longitudinal direction.

10. The apparatus (10) according to claim 8, wherein, The channel (13) includes a plurality of straight sections (21, 22, 23...) and curved sections (25, 26, 27...) and is arranged such that the channel (13) at least partially forms the first chamber (11) in such a way that the wall (18) of the channel at least regionally forms the wall (28) of the chamber.

11. The apparatus (10) according to claim 10, wherein, The channel (13) is arranged in a U-shape around the chamber (11).

12. The apparatus (10) according to any one of the preceding claims, wherein, The device (10) includes a second chamber (12) arranged between the passage (13) and the breathing gas outlet (4).

13. The apparatus (10) according to any one of the preceding claims, wherein, The second chamber (12) has a fourth acoustic impedance (17) that is different from the first acoustic impedance (14) and / or the second acoustic impedance (15) and / or the third acoustic impedance (16), thereby additionally damping the sound generated by the blower (5).

14. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) and / or the chamber (11) and / or the second chamber (12) are constructed as cavities in non-porous materials, particularly non-porous plastics.

15. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) has a volume of 100cm3-10000cm3, preferably 500cm3-5000cm3, and particularly preferably 800-4500cm3.

16. The apparatus (10) according to any one of the preceding claims, wherein, The channel (13) has a length of 1mm-1000mm, preferably 10mm-500mm, particularly preferably 10mm-350mm and / or a diameter of 1mm-30mm, preferably 5mm-20mm, particularly preferably 10mm-15mm.

17. The apparatus (10) according to any one of the preceding claims, wherein, The chamber (11) and / or the second chamber (12) have a volume of 2000cm3-40000cm3, preferably 4000cm3-20000cm3, and particularly preferably 10000-15000cm3.

18. The apparatus (10) according to any one of the preceding claims, wherein, The chamber (11) and / or the second chamber (12) have a depth (T) of 50 mm to 120 mm, preferably 80 mm to 100 mm and / or a height (H) of 10 mm to 70 mm, preferably 20 mm to 40 mm and / or a width of 10 mm to 100 mm, preferably 40 mm to 60 mm.

19. The apparatus (10) according to any one of the preceding claims, wherein, The dimensions of the chamber (11) and / or the second chamber (12) and / or the channel (13) are different, so that the acoustic impedances (15, 16, 17) are different from each other.

20. The apparatus (10) according to any one of the preceding claims, wherein, The device (10) includes a first connector (30) and / or a second connector (31) for connecting the device (10) to the breathing gas path (3) of the breathing device (1).

21. A breathing device (1) having a breathing gas inlet (2), a breathing gas outlet (4), and a breathing gas path (3) formed between the breathing gas inlet (2) and the breathing gas outlet (4), the breathing gas path having a blower (5) configured to deliver breathing gas from the breathing gas inlet (2) to the breathing gas outlet (4), thereby giving the breathing gas path (3) a suction side (6) and a pressure side (7), the breathing device comprising the means (10) according to any one of the preceding claims, wherein, The device (10) is arranged in the breathing gas path (3) between the blower (5) and the breathing gas outlet (4) and connected to the breathing gas path (3) via a first connector (30) and a second connector (31), such that a chamber (11) is arranged in the breathing gas path (3) on the pressure side (7) between the blower (5) and the breathing gas outlet (4), and a tubular channel (13) fluidly connects the chamber (11) to the breathing gas outlet (4).

22. The breathing device (1) according to claim 21, wherein, The breathing device (1) further includes a humidifier for humidifying and / or heating breathing gas, wherein the humidifier includes the chamber (11) and / or the second chamber (12) and / or the channel (13).

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