Converter protection device for external circuits

Abstract

The present invention includes a transducer protection device for protecting a pressure transducer connected to an external circuit, comprising a main body including a flow path, a first connector for fluidly coupling a first end of the flow path to a pipe of an external circuit, a second connector for fluidly coupling a second end of the flow path to a pressure transducer interface, and a hydrophobic gas permeable membrane disposed in the flow path to separate the first end of the flow path from the second end. The transducer protection device is characterized in that the second connector is a snap-type connector.

Description

Technical Field

[0001] The present invention relates to a converter protection device for protecting a pressure converter connected to an extracorporeal blood circuit.

Background Art

[0002] In medical procedures that require an extracorporeal circuit, such as hemodialysis in particular, the pressure in the extracorporeal circuit, for example, arterial and / or venous pressure, must be constantly monitored. This is usually achieved using a pressure converter connected to the main circuit of the extracorporeal circuit by a branch pipe.

[0003] To protect a pressure converter typically located inside a dialysis machine from any contact with the patient's blood, a converter protection device is usually provided between the pipe and the pressure converter. In particular, the converter protection device may be provided as a disposable part of the extracorporeal circuit that is connected to the pressure converter interface during the procedure.

[0004] Document EP 2 226 087 A1 shows a well-established configuration of a converter protection device for an extracorporeal circuit, which includes a main body containing a flow path, a first connector for fluidly coupling the first end of the flow path to a pipe of the extracorporeal circuit, a second connector for fluidly coupling the second end of the flow path to a pressure converter interface, and a hydrophobic gas-permeable membrane disposed in the flow path for separating the first end of the flow path from the second end.

[0005] In this known converter protection device, the second connector is configured as a female Luer-type connector including a threaded section for screwing the second connector onto a corresponding threaded section of the pressure converter interface. Further, the main body of the converter protection device is formed using two plastic half-shells enclosing the hydrophobic membrane therebetween, and the two sections form a circular section disposed between the two tubular connectors. The circular section enclosing the membrane is used as a gripping section for turning the converter protection device to open and close the Luer connection.

[0006] This transducer protection device offers a robust design that has been used in the market for many years. However, it has suboptimal utility and is difficult to handle, particularly due to the reduced surface area of ​​the circular central element. Furthermore, it is difficult to secure due to the rotational movement required to screw the components onto the Luer lock male connector. Finally, the user cannot determine whether the transducer protection device is properly connected and therefore whether the connection is tight. Moreover, the transducer protection device is difficult to manufacture.

[0007] Despite these drawbacks, the standard configuration using two semi-shells and Luer lock connections remains a generally accepted solution in the market for connecting transducer protection devices to corresponding pressure transducer interfaces. To date, most efforts to improve known transducer protection devices have focused on improving the safety of the membrane isolation function. For example, reference EP 2 408 490 B1 shows a transducer protection device using two membranes arranged in series. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] EP 2 226 087 A1 [Patent Document 2] EP 2 408 490 B1 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The object of the present invention is to provide an improved transducer protection device and a corresponding pressure transducer interface for an external circuit. In particular, the present invention aims to avoid at least some of the shortcomings of the known solutions described above. [Means for solving the problem]

[0010] This objective is achieved by the converter protection devices described in claims 1 and 8, and the pressure converter interface described in claim 10.

[0011] In a first aspect, the present application includes a transducer protection device for protecting a pressure transducer connected to an external circuit, the transducer protection device including a main body including a flow channel, a first connector for fluidly coupling a first end of the flow channel to a pipe of the external circuit, a second connector for fluidly coupling a second end of the flow channel to a pressure transducer interface, and a hydrophobic gas permeable membrane disposed in the flow channel to separate the first end of the flow channel from the second end. In particular, the first and second connectors are disposed at the ends of the flow channel extending through the main body of the transducer protection device, and the hydrophobic gas permeable membrane is disposed in the flow channel so that when the pipe of the external circuit and the pressure transducer interface are coupled to the transducer protection device, they are fluidly connected to each other through the hydrophobic gas permeable membrane. In a first aspect of the present invention, the second connector is a snap-type connector.

[0012] The inventors have recognized that snap-type connectors are decisively easier to handle than Luer connectors used in the prior art. Furthermore, users are provided with tactile and / or audible feedback, thereby ensuring proper connection. Snap-type connectors enable the additional advantages described below.

[0013] In embodiments of the present invention, the second connector is configured to snap-engage with the pressure transducer interface by a single axial movement in the direction of the flow path toward the second end.

[0014] The snap-type connection provided by the second connector engages with a single axial movement in the direction of the flow path toward the second end, making it easier to establish a connection with the pressure transducer interface than conventional solutions that require rotational movement. This improves usability.

[0015] In embodiments of the present invention, the first connector is a tubular element configured to receive the end section of a pipe of an external circuit.

[0016] In embodiments of the present invention, the end section of the pipe is bonded to the tubular element.

[0017] In embodiments of the present invention, the first connector includes a receiving section for a third connector. The third connector may be, for example, a male or female Luer connector, a bayonet connector, or a screw connector.

[0018] In embodiments of the present invention, the second connector includes at least one cantilevered snap-type element.

[0019] In embodiments of the present invention, the snap-type element is a snap-type arm having a free end that includes a snap-type shape for snapping into an opposing element of a pressure transducer interface, and is connected to the main body of the transducer protection device.

[0020] In embodiments of the present invention, the snap-type configuration includes a hook section for snap-engaging with a hook section of an opposing element of a pressure transducer interface.

[0021] In embodiments of the present invention, the snap-type arm includes a chamfered section located at its free end, and the hook section is located behind the chamfered section.

[0022] The chamfered section can be configured to contact the front surface of the opposing element of the pressure transducer interface, and such contact deforms the snap arm when the snap arm is moved axially until the hook section of the snap arm engages with the hook section on the pressure transducer interface.

[0023] In an embodiment of the present invention, the snap-on arm extends from the connection point where it is connected to the main body of the transducer protection device along the flow path of the transducer protection device in the direction towards the pressure transducer interface. In particular, the snap-on arm can extend at an angle of less than 20° with respect to the axial direction defined by the direction of the flow path at its second end.

[0024] In a first variant, the snap-on arm extends only in the direction from the connection point towards the pressure transducer interface. This can expand the handling area.

[0025] In a second variant, the snap-on arm includes a first section extending from the connection point in a direction away from the pressure transducer interface and a second section extending from the connection point in a direction towards the pressure transducer interface, and each section has a free end. The first section extending from the connection point in a direction away from the pressure transducer interface can form a handling area for gripping the transducer protection device.

[0026] In an embodiment of the present invention, the snap connection provided by the second connector is a detachable connection.

[0027] In an embodiment of the present invention, the second connector is configured such that the snap connection is detachable by bending at least one snap element by applying pressure to the handling section of the snap element. This ensures that the snap connection can be reliably disengaged.

[0028] [[ID=2--0]]In an embodiment of the present invention, the snap element is configured to be detachable by pressure acting in a direction from the outside towards the main body of the connector with respect to its handling section.

[0029] In an embodiment of the present invention, the snap element is the snap-on arm defined herein, particularly the above-described snap-on arm.

[0030] < / / In embodiments of the present invention, the second connector includes at least two separate snap-on elements. Each of these snap-on elements can be configured as described above with respect to at least one snap-on element.

[0031] In embodiments of the present invention, the snap-type elements are positioned at the second ends of the flow path on both sides of the axis defined by the flow path.

[0032] In embodiments of the present invention, the snap-type connection provided by the second connector can be released by pressing the handling sections of the snap-type elements toward each other from the outside. This allows for easy operation of the transducer protection device.

[0033] In embodiments of the present invention, each of the snap-type elements is a snap-type arm as described herein.

[0034] In embodiments of the present invention, the second end of the flow path is configured as a tubular element that will engage in a sealed manner with the flow path of the pressure transducer interface, preferably one or more snap elements of the second connector extending outward from the connection point with the main body of the transducer protector toward the pressure transducer interface and away from the tubular element, and deformable toward and / or away from the tubular element. This enables a reliable seal provided by the combination of the tubular element and the one or more snap elements, which provide a secure snap connection without any mutual interference.

[0035] In a modified example, the second end of the flow path is surrounded by a flange surface with a sealed layer laminated to it for sealed engagement with the pressure transducer interface, preferably a hydrophobic gas permeable membrane bonded to this sealed layer.

[0036] The hydrophobic gas permeable membrane is preferably bonded to the main body and / or sealing layer of the transducer protection device by thermal bonding, ultrasonic welding, or adhesive bonding. A preferred method for bonding the membrane to the sealing layer is ultrasonic welding.

[0037] In embodiments of the present invention, the snap-fit ​​configuration of the second connector is configured to snap-engage from the inside with the opposing element of the pressure transducer interface. Thus, in particular, the snap-fit ​​configuration may be provided on the outside of one or more snap-fit ​​elements of the transducer protection device.

[0038] In embodiments of the present invention, the handling section of at least one snap-on element of the second transducer is located between the connection point where the snap-on element is connected to the main body of the transducer protection device and the free end of the snap-on element configured to be connected to the pressure transducer interface. This can provide a particularly large handling section.

[0039] In the second modification, the snap-type shape of the second connector is configured to snap-engage from the outside with the opposing element of the pressure transducer interface.

[0040] In embodiments of the present invention, the handling section for at least one snap-on element of the second transducer is located between a connection point where the snap-on element is connected to the main body of the transducer protection device and the free end of the first section of the snap-on element extending away from the pressure transducer interface.

[0041] In embodiments of the present invention, the second connector includes at least one snap-type arm extending along the flow path of the transducer protection device toward the pressure transducer interface, wherein the length of the snap-type arm in the direction determined by the flow path is at least 50%, preferably at least 65%, and more preferably at least 80% of the length of the flow path. This simplifies the handling of the transducer protection device.

[0042] In embodiments of the present invention, the handling section of the snap-type element is preferably provided with a ridge extending in the direction of the flow path.

[0043] In embodiments of the present invention, the snap-type element or snap-type shape of the second connector has a round shape, preferably a basically circular shape, centered on an axis defined by the flow path, at the second end of the flow path. This allows for particularly efficient connection. In particular, the shape can be circular.

[0044] In embodiments of the present invention, the outer and / or inner edges of the snap-type element or snap-type shape of the second connector have a rounded shape in cross-section, preferably a basically circular shape. In particular, the shape can be circular.

[0045] In the first modification, the transducer protection device is formed by two molded parts, each including one of a first and a second connector, and / or a hydrophobic gas permeable membrane is placed between these two molded parts.

[0046] In this embodiment, the first component includes a first connector and a snap-on arm.

[0047] In the embodiment, the second component includes a second tubular element for connecting the flow path to the pressure transducer interface. Preferably, the inner diameter of the second tubular element is greater than the diameter of the membrane and / or includes a bottom section that protects the membrane, the bottom section having a hole.

[0048] In the embodiment, the second tubular element extends from the outer edge of the bottom section toward the second side and, in particular, together with the bottom section, has a pan-like shape.

[0049] In a second modification of the present invention, the transducer protection device is formed by an integrally molded part that includes the entire flow path and preferably both the first and second connectors. This reduces production costs.

[0050] In a third modification of the present invention, which can be combined with the second modification, the hydrophobic gas permeable membrane is coupled to the main body of the transducer protector from the side of the second end of the flow path. In particular, the hydrophobic gas permeable membrane is provided within the flow path of the transducer protector and coupled to a stepped portion facing the second end.

[0051] The second and third modifications also constitute the subject matter of the present invention, independent of the snap-type connection according to the first embodiment, and in particular form the second and third independent embodiments described below.

[0052] In a second aspect, the present application provides a transducer protection device for an external circuit, the transducer protection device comprising a main body including a flow channel, a first connector for fluidly coupling a first end of the flow channel to a pipe of the external circuit, a second connector for fluidly coupling a second end of the flow channel to a pressure transducer interface, and a hydrophobic gas permeable membrane disposed in the flow channel to separate the first end of the flow channel from the second end. In particular, the first and second connectors are located at the ends of the flow channel extending through the main body of the transducer protection device, and the hydrophobic gas permeable membrane is disposed in the flow channel so that the pipe of the external circuit and the pressure transducer interface are fluidly connected to each other through the hydrophobic gas permeable membrane when coupled to the transducer protection device. In a second aspect of the present invention, the transducer protection device comprises a single molded part including the entire flow channel. This simplifies manufacturing.

[0053] In embodiments of the present invention, the integrally molded component includes the entire flow path and at least sealed sections of first and second connectors configured to provide a sealed connection to the pipe and the pressure transducer interface.

[0054] In embodiments of the present invention, the integrally molded part includes the entire flow path, and the second end of the flow path is formed by a tubular element configured to be sealed to a pressure transducer interface, particularly to its sealing element.

[0055] In a first modification of a second aspect of the present invention, the mechanical locking element of the second connector, in particular the snap-type element, may be provided as a separate part connected to an integrally molded part.

[0056] In a second preferred modification of the second aspect of the present invention, the integrally molded part includes the first and second connectors, i.e., all of their components.

[0057] In the embodiments of the present invention, the integrally molded part transducer is the only structural component of the protective device.

[0058] In embodiments of the present invention, the transducer protection device is formed by an integrally molded part and a hydrophobic gas permeable membrane, and optionally one or more sealing elements, and there are no additional parts attached to the transducer protection device.

[0059] In a second aspect, the present application includes a transducer protection device for protecting a pressure transducer connected to an external circuit, the transducer protection device including a main body including a flow channel, a first connector for fluidly coupling a first end of the flow channel to a pipe of the external circuit, a second connector for fluidly coupling a second end of the flow channel to a pressure transducer interface, and a hydrophobic gas permeable membrane disposed in the flow channel to separate the first end of the flow channel from the second end. In particular, the first and second connectors are located at the ends of the flow channel extending through the main body of the transducer protection device, and the hydrophobic gas permeable membrane is located in the flow channel so that when the pipe of the external circuit and the pressure transducer interface are coupled to the transducer protection device, they are fluidly connected to each other through the hydrophobic gas permeable membrane. In a third aspect of the present invention, the hydrophobic gas permeable membrane is coupled to a stepped portion of the transducer protection device, and the coupled area of ​​the hydrophobic gas permeable membrane is accessible from the second end of the flow channel.

[0060] As in the second embodiment, this simplifies the manufacture of the converter protection device.

[0061] In a third embodiment of the present invention, the step portion is provided within the flow path or at a second end of the flow path.

[0062] In embodiments of the present invention, the inner diameter of the flow path between the second end of the flow path and the step portion is larger than the inner diameter of the flow path in the step portion.

[0063] In embodiments of the present invention, the inner diameter and / or cross-section of the flow path at the second end of the flow path, and preferably between the second end and the hydrophobic gas permeable membrane, is larger than the outer diameter and / or outer shape of the hydrophobic gas permeable membrane.

[0064] This simplifies the installation of the hydrophobic gas permeable membrane into the step portion, as the membrane and / or coupling tool can be inserted into the transducer protector through the second end to manufacture the transducer protector.

[0065] In embodiments of the present invention, the second end of the flow path is formed by a tubular element configured to be sealed to a pressure transducer interface, the inner diameter of which is larger than the inner diameter of the tubular element forming the first connector. Preferably, the inner diameter of the tubular element forming the second end of the flow path is at least 120%, preferably at least 150%, of the inner diameter of the tubular element forming the first connector. These features are preferable for transducer protection devices according to all embodiments of the present invention.

[0066] In embodiments of the present invention, the inner diameter and / or inner cross-section of the stepped portion is larger than the inner diameter and / or cross-section of the first connector and / or the pipe connected thereto. This provides an effective surface area of ​​the hydrophobic gas permeable membrane that is larger than the cross-section of the first connector and / or the pipe connected thereto.

[0067] The second and third aspects of the present invention are preferably combined.

[0068] Furthermore, the first and second embodiments and / or the first and third embodiments are preferably combined.

[0069] More preferably, the first, second, and third embodiments are combined.

[0070] The present invention further includes a pressure transducer interface configured to be connected to a second connector of the transducer protection device defined above, the pressure transducer interface including a flow path coupled to the pressure transducer and a snap-type opposing element for engaging with the snap-type shape of the snap-type element of the second connector. The pressure transducer interface provides the same advantages as described above with respect to the transducer protection device according to the first embodiment. The pressure transducer interface may include a pressure transducer.

[0071] In embodiments of the present invention, the pressure transducer interface includes a sealing element for sealing engagement with a tubular section of a second connector of a transducer protector. The sealing element may contact the front and / or inner or outer surface of the tubular element. The sealing element may be provided by a sealing ring or a conical section.

[0072] In embodiments of the present invention, the sealing element engages with the front surface or side surface of the tubular section.

[0073] In embodiments of the present invention, the sealing element is formed by an inner conical section of a tubular section, particularly a Luer conical section, and an engaging conical section.

[0074] In embodiments of the present invention, the snap-type opposing element is formed by a bracket that extends freely between two connection sections to which the snap-type element of the second connector is connected to the main surface of the pressure transducer interface, and the bracket has an intermediate section for engaging with the snap-type shape of the snap-type element. The bracket can, in particular, project from the main surface toward the transducer protection device.

[0075] The bracket allows the user to access it from below and easily clean / disinfect around the flow path of the pressure transducer interface.

[0076] In embodiments of the present invention, the main surface is a basically flat surface from which the bracket protrudes in the direction toward the transducer protection device.

[0077] In the modified example, the counter element is formed by notches in recesses provided on the main surface of the pressure transducer interface.

[0078] The pressure transducer interface and / or transducer protection device may have features to prevent improper mounting and, in particular, to avoid mounting in a position rotated 90° around their axes.

[0079] In embodiments of the present invention, the pressure transducer interface includes a threaded section configured to engage with another type of transducer protection device, including a Luer connector, in addition to a snap-on counter element.

[0080] Such a pressure transducer interface is compatible with both conventional transducer protection devices and the transducer protection device of the present invention.

[0081] The present invention further includes a tubing system comprising a transducer protection device as defined herein and at least one component of an extracorporeal blood circuit.

[0082] In particular, the components of the extracorporeal blood circuit are connected to a first connector via tubing, preferably by being bonded to or inserted into a section of the first connector.

[0083] In this embodiment, the components of the extracorporeal blood circuit are connected to the first connector through a third connector. The third connector may be, for example, a male or female Luer connector, a bayonet connector, or a screw connector.

[0084] Preferably, the tube is a tube extending from the venous chamber of the extracorporeal blood circuit to transport air across a hydrophobic gas permeable membrane.

[0085] The components of an extracorporeal blood circuit may, in particular, be venous chambers.

[0086] The tubing system may include yet another component of the extracorporeal blood circuit, such as venous lines and / or arterial lines or connecting lines that can be connected to these lines.

[0087] The present invention further includes a system comprising a transducer protection device as defined herein and a pressure transducer interface as defined herein.

[0088] The present invention further includes blood treatment machines, in particular dialysis machines, that include a pressure transducer interface as defined herein.

[0089] In particular, the pressure transducer interface may be provided on the casing of the blood treatment machine. The main surface of the pressure transducer interface may be provided by the outer surface of the casing.

[0090] The present invention further includes a blood treatment machine, in particular a dialysis machine, which includes a pressure transducer interface and a transducer protection device as defined herein. The blood treatment machine may further include an extracorporeal blood circuit.

[0091] The present invention further includes the use of this transducer protection device for connecting a pipe of an extracorporeal circuit to a pressure transducer by snapping the snap-type element of the second connector of the transducer protection device according to the first embodiment to a snap-type opposing element of the pressure transducer interface of a blood treatment machine, in particular of the blood treatment machine described above.

[0092] In yet another independent aspect, the present invention includes a method for manufacturing a transducer protection device for an external circuit, comprising a main body including a flow channel, a first connector for fluidly coupling a first end of the flow channel to a pipe of an external circuit, a second connector for fluidly coupling a second end of the flow channel to a pressure transducer interface, and a hydrophobic membrane disposed in the flow channel to separate the first end of the flow channel from the second end, the method being A step of integrally molding the main body of the protective device, which includes the entire flow path and preferably both the first connector and the second connector, and / or A step of coupling a hydrophobic gas permeable membrane to a step portion of a transducer protection device provided in or at the second end of a flow channel, preferably by accessing the coupling region of the hydrophobic gas permeable membrane from, preferably through, the second end of the flow channel, Includes.

[0093] This will provide the same advantages as those discussed above with respect to the second and third embodiments.

[0094] This method can be used, in particular, for the manufacture of the converter protection device described above with respect to the first, second, and / or third aspects of the present invention.

[0095] The present invention will now be described in more detail with respect to the drawings and embodiments.

[0096] The diagram shows the following: [Brief explanation of the drawing]

[0097] [Figure 1] This is a side view of a first embodiment of the converter protection device of the present invention. [Figure 2] This is a perspective view of the first embodiment as seen from the first side. [Figure 3] This is a cross-sectional view showing a first embodiment of the transducer protection device coupled to a first embodiment of the pressure transducer interface according to the present invention. [Figure 4] This is a cross-sectional view showing a first embodiment of the transducer protection device connected to a second embodiment of the pressure transducer interface according to the present invention. [Figure 5] This is a cross-sectional view in which a first embodiment of the transducer protection device is combined with a third embodiment of the pressure transducer interface according to the present invention. [Figure 6] Two perspective views of a fourth embodiment of the pressure transducer interface. [Figure 7] The first embodiment of the transducer protection device and the fourth embodiment of the pressure transducer interface connected thereto are shown as two perspective views. [Figure 8]This is a cross-sectional view showing a second embodiment of the transducer protection device connected to a fifth embodiment of the pressure transducer interface. [Figure 9] This is a cross-sectional view showing a third embodiment of the transducer protection device coupled to a sixth embodiment of the pressure transducer interface. [Figure 10] This is a perspective view of a fourth embodiment of the converter protection device. [Figure 11] This is a perspective view of the fifth embodiment of the converter protection device. [Figure 12] This is a perspective view of the sixth embodiment of the converter protection device. [Figure 13] This is a cross-sectional view of the seventh embodiment of the converter protection device. [Figure 14] This is a perspective view of the seventh embodiment. [Figure 15] This is a perspective view of two modified examples of the seventh embodiment. [Figure 16] This is a perspective view of a fifth embodiment of the pressure transducer interface. [Figure 17] This is a diagram of an embodiment of a tube set including components of an extracorporeal blood circuit and a transducer protection device of the present invention. [Modes for carrying out the invention]

[0098] Figures 1 to 5 and 7 show a first embodiment of the transducer protection device according to the present invention. Further embodiments are shown in Figures 8 to 15. Figure 17 shows an embodiment of a tube set including an extracorporeal blood circuit and the transducer protection device of the present invention. Unless otherwise stated, the features and configuration of the transducer protection device described below apply to all embodiments.

[0099] Furthermore, the first embodiment of the converter protection device, as well as most of the other embodiments, embody all aspects of the present invention in combination. However, the features described for each embodiment are considered to be usable independently of the other embodiments.

[0100] According to the present invention, the converter protection device 10 includes a main body 50 which includes a flow path 11 indicated by an arrow in Figure 1. The flow path 11 passes through the main body of the converter protection device from a first end 12 to a second end 13. Furthermore, a hydrophobic gas permeable membrane 60, as shown in Figures 3 and 13, is arranged within the flow path 11 to separate the first end of the flow path from the second end.

[0101] The hydrophobic gas permeable membrane is, in particular, an air-permeable hydrophobic membrane. Thus, the hydrophobic gas permeable membrane allows for a connector connection that is air-permeable and therefore pressure-permeable but not liquid-permeable, and thus protects the second end 13 from blood flowing in through the first end 12.

[0102] The transducer protection device 10 includes a first connector 20 for fluidly coupling the first end 12 of the flow path to the pipe of the external circuit. In particular, as shown in Figures 2 and 3, the first connector may be provided by a tubular element 20 into which the distal end of the pipe of the external circuit can be inserted. The end of the pipe can be bonded to the first connector, particularly to the inside of the tubular element 20, by adhesive.

[0103] The transducer protection device further includes a second connector for fluidly coupling the second end 13 of the flow path to a pressure transducer interface, such as one of the pressure transducer interfaces shown in Figures 3 to 9 and Figure 16. Unless otherwise shown, the second connector 30 includes a second tubular element 37 for a sealed connection to the flow path of the pressure transducer interface. Unless otherwise shown, the second tubular element 37 has a larger diameter than the first tubular element 20 forming the first connector and / or a larger diameter than the membrane 60.

[0104] In a first aspect of the present invention, the second connector 30 of the present invention is configured as a snap-type connector. In the illustrated embodiment, the snap-type connection between the second connector and the pressure transducer interface is engaged by the axial movement of the transducer protection device shown by arrow 40 in Figure 2.

[0105] Therefore, no rotational movement is required when closing the snap-type connection. In contrast to conventional solutions using luer connections, a single axial movement ensures secure fastening. This provides improved utility.

[0106] The snap-type connection is provided by snap-type elements 31 and 32 of the second connector 30. In these embodiments, the snap-type elements are provided as cantilevered snap-type arms, and at least one section of the snap-type arm extends from the connection point 34 with the main body of the transducer protection device toward the pressure transducer interface along the flow path 11 of the pressure transducer.

[0107] In the illustrated embodiment, the snap arms 31 and 32 form or include a handling section for the transducer protection device, which is used to grip the transducer protection device and to actuate the snap connection, and in particular to release the snap connection by applying pressure to the handling section. This section provides a larger handling area and therefore offers improved utility compared to the prior art.

[0108] Furthermore, the snap-type connection ensures proper connection through tactile and audible feedback. In particular, the snap-type connection provides a click sound and a sudden increase in counteracting pressure against axial movement upon engagement.

[0109] The snap-type arms 31 and 32 are provided with a snap-type shape 33 at their free end, configured to engage with the opposing elements 73, 82, 83, or 92 of the pressure transducer interface.

[0110] The snap shape 33 of each snap arm includes, in particular, a hook section 36 provided by a stepped surface that protrudes particularly away from the main outer or main inner surface of the snap arm, and a chamfered section 35 which is particularly in the form of an inclined surface and forms initial contact with the opposing element.

[0111] In particular, due to contact between the chamfered section 35 and the opposing element, the snap-type arm is deformed by the axial movement of the transducer protection device, thereby allowing the hook section 36 to pass over the opposing element and engage with the hook section of the opposing element.

[0112] For this purpose, the chamfered section 35 is provided in front of the hook section 36 at the free end of the snap-type arm.

[0113] In one embodiment, the hook section 36 includes an arc and has an annular shape. That is, the width of the hook section is constant in the radial direction.

[0114] In another embodiment of the present invention, the hook section 36 includes an arc and has a crescent or sickle shape. That is, the radial width of the hook section is not constant, but rather has a maximum value in the middle of the arc.

[0115] In most of the illustrated embodiments, the main body of the converter protection device is provided by two tubular sections 20 and 37 of the first and second connectors 20 and 30.

[0116] In all the embodiments shown, at least two snap-type arms 31 and 32 are provided on either side of the main body with respect to the axis given by the flow path.

[0117] In all the embodiments shown, the flow path defines a single axis through the connector, and the first tubular element 20 and the second tubular element 37 are arranged collinearly with respect to each other.

[0118] Furthermore, in all embodiments except the embodiment shown in Figure 9, the snap-type arms 31 and 32 extend from the connection point 34 with the main body along the outside of the main body, but separately from the main body and at a distance toward the pressure transducer interface. In particular, the snap-type arms 31 and 32 extend from the connection point 34 with the main body along the outside of the tubular element forming the second end of the flow path, but separately from the tubular element and at a distance toward it.

[0119] As a result, the axial length of the snap-type arm is approximately the same as the length of the main body or flow path, thereby expanding the handling area available on the snap-type arm.

[0120] In the first embodiment shown in Figures 1 to 5 and Figure 7, and in the embodiments shown in Figures 11 to 15, the transducer protection device has a snap-type shape 33 positioned outside the snap-type arms 31 and 32, and thus engages with the opposing element of the pressure transducer interface outside these arms.

[0121] To disengage the snap-type connection, the snap-type arms 31 and 32 are thus bent toward each other and / or toward the main body at their free ends facing the pressure transducer interface.

[0122] Furthermore, in these embodiments, the snap-type arms 31 and 32 extend only in one axial direction from the connection point 34 to the main body, i.e., only from the connection point 34 toward the pressure transducer interface. In addition, the handling section of the snap-type arm is provided between the connection point 34 and the free end facing the pressure transducer interface.

[0123] In most of the illustrated embodiments, a handling section is provided having a ridge extending from the connecting section 34 toward the free end. Alternatively, the ridge is provided perpendicular to the direction from the connecting point 34 toward the free end. Furthermore, as shown in Figures 14 and 15, the handling sections of the snap-type arms 31 and 32 may be provided as smooth surfaces without ridges.

[0124] In the illustrated embodiment, the snap-fit ​​arm extends at an angle other than zero away from the central axis of the transducer protector, when not deformed by external pressure, toward the free end of the snap-fit ​​arm facing the pressure transducer interface from the connection point 34. In particular, this angle can be between 2° and 25°, and especially between 4° and 15°, as an average over the extension of the snap-fit ​​arm. This allows for easy manufacturing by injection molding.

[0125] In the illustrated embodiment, the second tubular section 37 is connected to the first tubular section 20 by a stepped portion 51. Furthermore, the inner diameter of the second tubular section 37 is larger than the outer diameter of the first tubular section 20.

[0126] Furthermore, in the illustrated embodiment, the second tubular section 37 extends along its entire circumference from the first end of the flow path to the stepped portion 51.

[0127] In the embodiments shown in Figures 1 to 5, Figure 11, and Figure 12, the second tubular section 37 extends beyond the stepped portion 51 toward the first side within the first circumferential part, and the connecting ends of the snap-type arms 31 and 32 are attached to the rear side of these first parts of the tubular element 37. In these embodiments, the second tubular section 37 terminates at the stepped portion within the second circumferential part, which is positioned between the first parts.

[0128] Furthermore, the first part of the second tubular element 37 is connected to the first tubular element 20 by a web 22 that extends axially between the stepped portion 51 and the first end and radially between the first tubular element 20 and the second tubular element 37.

[0129] In a second aspect of the present invention, the main body of the transducer protection device, including the flow path of the first and third to sixth embodiments, is formed as a single integrated part by injection molding. In particular, the first tubular element and the second tubular element can be formed as a single integrated part by injection molding.

[0130] Furthermore, in the first and third to sixth embodiments, the entire transducer protection device, including all elements of the first and second connectors, is formed as a single, integrated component by injection molding.

[0131] As will be described in more detail below, in the second and seventh embodiments of the pressure transducer, the main body is formed by two parts or shells connected to each other.

[0132] In one embodiment, according to a third aspect of the present invention, the hydrophobic film 60 is coupled to the step portion 51 of the transducer protection device from the second side.

[0133] In all embodiments except those shown in Figures 8 and 13 to 15, the diameter of the second side of the channel is greater than the diameter of the membrane 60 in order to allow free insertion of the membrane through the second end of the channel during manufacturing and to provide access to the bonding tool. Bonding of the hydrophobic membrane to the sealing layer can be done by thermal bonding, ultrasonic welding, or adhesion. The preferred method for bonding the membrane to the sealing layer is ultrasonic welding.

[0134] Furthermore, in the first embodiment and in the fourth to seventh embodiments, the diameter of the second tubular element 37 is greater than the diameter of the membrane 60, and the membrane 60 is coupled to a step portion 51 that connects the first end of the tubular element 37 to the first tubular element 20.

[0135] Furthermore, in all embodiments, the step portion 51 has an inner diameter larger than that of the connection hole in the bottom portion of the step portion that connects the inside of the second tubular element 37 to the inside of the first tubular element 20, at the position where the membrane is bonded to it. In particular, the bottom surface of the step portion can be concave (recessed) with respect to the step surface to which the membrane is bonded, and the connection hole to the first tubular element is provided within the bottom wall.

[0136] In this embodiment, the stepped portion 51 also has a larger inner diameter than the first tubular element 20 at the position where the membrane is bonded.

[0137] In the seventh embodiment shown in Figures 13 to 15, the main body of the pressure transducer is formed by two parts 42 and 43. The first part 42 includes a flow path, particularly the first end of the first tubular element 20, and snap-type arms 31 and 32. The second part 43 includes a flow path, particularly the second end of the second tubular element 37.

[0138] In the seventh embodiment, the second tubular element 37 includes a bottom section 45 that extends parallel to the membrane 60 and protects the membrane 60 from the second end of the flow path. The bottom section 45 has holes to allow fluid communication between the membrane and the second end. The membrane is positioned between the stepped portion 51 of the first component and the bottom section 45 of the second component.

[0139] In the seventh embodiment, the membrane is bonded to the stepped portion 51 as described above, and the stepped portion forms part of the first component 42. Alternatively, the membrane may be bonded to the bottom section 45 on the side facing the stepped portion, or bonded between the stepped portion 51 and the bottom section 45.

[0140] The second tubular element 37, together with the bottom section 45, has a pan-like shape, in which case the second tubular element 37 extends from the outer edge of the bottom section 45 toward the second end, and the diameter of the second tubular element 37 remains constant toward the second end from the bottom section or expands toward the second end. Furthermore, the diameter of the second tubular element 37 is greater than the diameter of the membrane 60 along its entire length.

[0141] In the seventh embodiment, the first part 42 and the second part 43 are connected to each other, for example, by adhesive or welding, particularly by friction welding or ultrasonic welding. Each of the first and second parts can be formed as a single part by injection molding. In this embodiment, the second part 43 has a ring-shaped connecting portion 44 that extends toward the first part 42 and engages with a groove provided in the first part. In this embodiment, the ring-shaped connecting portion 44 is formed by the lower end of the tubular element 37 and protrudes toward the first part beyond the position of the bottom section 45. The groove that engages with the connecting portion 44 is formed in the stepped portion 51 of the first part 42.

[0142] In the seventh embodiment, the second tubular element 37 extends beyond the ends of the snap-on elements 31 and 32 in the direction of the first end to provide improved guidance for the connector when connected to the pressure transducer interface 70.

[0143] As shown on the left side of Figures 14 and 15, in the first modification, the pressure transducer includes a second handling section 41 positioned between the snap arms 31 and 32 for gripping the pressure transducer during connection to the pressure transducer interface 70, in addition to the snap arms 31 and 32 which have their own handling sections for disengaging it. In this embodiment, the second handling section 41 is positioned on top of the first part 42. Furthermore, these sections have a radial dimension greater than the radial dimension of the snap arms 31 and 32 so that they protrude outward relative to the snap arms 31 and 32. In this embodiment, the outer surface of the second handling section 41 has a concave shape in the section perpendicular to the axis of the pressure transducer and is provided with ridges to achieve a more secure grip.

[0144] As shown on the right side of Figure 15, in the second modification, the pressure transducer does not include the second handling section 41, and therefore, when connecting the pressure transducer to the pressure transducer interface 70, the pressure transducer is gripped by the snap-type arms 31 and 32 as described above.

[0145] In addition to pressure transducers, the present invention also provides novel pressure transducer interfaces configured to engage with the transducer protection device of the present invention. Different modifications of such interfaces 70, 70', and 70'' are shown in Figures 3 to 5 and Figure 16.

[0146] In these embodiments, the interface is configured to engage with the transducer protection device of the first or fifth and sixth embodiments. Thus, the opposing element 73 of the transducer interface is provided with a snap-fit ​​shape, particularly a hook section, on its inside, which engages with the snap-fit ​​shape of the transducer protection device provided on the outside of the snap-fit ​​arm of the first embodiment shown in Figures 1 to 5 and the fifth to seventh embodiments shown in Figures 11 to 15.

[0147] In all embodiments, sealing is provided between the transducer protection device and the pressure transducer interface by sealing elements 72, 72' positioned on the side of the pressure transducer interface. The sealing elements 72, 72' are configured to engage sealably with the second tubular section 37 of the transducer protection device. In particular, the sealing elements 72, 72' are provided by O-rings manufactured from an elastomer material.

[0148] In the embodiments shown in Figures 3 and 4, the sealing element 72 engages with the front surface of the tubular element 37. In Figures 5, 13, and 16, the sealing element 72' engages with the inner surface of the tubular element 37. In an alternative configuration, the sealing element 72' can engage with the outer surface of the tubular element 37.

[0149] In Figures 3 and 4, the sealing element 72 has a rectangular cross-section and is provided in a groove facing the transducer protection device.

[0150] In Figures 5, 13, and 16, the sealing element is provided in a groove provided on the outside of the tubular section of the pressure transducer interface, which has a circular cross-section.

[0151] In the illustrated embodiment, the converter protection device of the present invention can be used in combination with different types of mechanical interfaces, as shown in Figures 3 to 5.

[0152] Figure 3 shows a first embodiment specifically designed to connect only to the transducer protection device of the present invention. The first embodiment includes a projection 75 that protrudes into the tubular section 37 to reduce the air volume of the connector. Furthermore, in this configuration, the front surface of the projection 75 is positioned as a support near the membrane 60 provided on the stepped portion 51 of the transducer protection device, so that the membrane is more reliably supported against accidental overpressure. A flow path 71 connected to the pressure transducer extends through the projection 75.

[0153] The interfaces shown in Figures 4, 5, 13, and 16 are configured to connect to both the transducer protection device of the present invention and conventional transducer protection devices, including standard Luer connections.

[0154] For this purpose, the interfaces shown in Figures 4, 5, 13, and 16 include a threaded section 75 and a male Luer cone containing a flow path 71 connected to a pressure transducer, which are connected to a female Luer connection by a screw connection.

[0155] In the embodiments shown in Figures 3 to 5, the opposing elements of the snap-type connector are provided within the recess 74. Such recesses may be provided, for example, as recessed portions within the main surface of the interface.

[0156] In contrast, Figures 6, 7, and 16 show an improved interface configuration in which the opposing elements 82 and 83 for snap-on connections are provided by brackets protruding from the main surface 81 of the interface, making cleaning and disinfection easier.

[0157] In particular, brackets 82 and 83 are connected to the main surface 81 only at their ends by webs 86 and have free-bridging inner sections that extend above the main surface 81 at a distance from it. As can be seen in the right-hand drawings of Figures 6 and 7, the hook sections 84 of the opposing elements for engaging with the hook sections 36 of the snap-type arms 31, 32 are provided on these intermediate sections of brackets 82 and 84. Furthermore, these brackets equally have chamfered sections 85 for contacting the chamfered sections of the snap-type arms of the transducer protector.

[0158] The brackets, therefore, allow users to easily clean and disinfect the fluid connection points provided between them, accessible from below.

[0159] In the embodiments shown in Figures 6 and 7, the brackets 82 and 83 are separate elements separately connected to the main surface 81 by webs provided at their respective ends. In contrast, in the embodiment shown in Figure 16, the brackets 82 and 83 are joined at their ends and form a ring-shaped element connected to the main surface by a web 86.

[0160] As can be seen in Figure 16, the pressure transducer interface may be provided as an interface element that can be inserted from behind into an opening in the wall section of the medical device.

[0161] The fluid connection and sealing portion for the embodiments shown in Figures 6 and 7 may include any of the modifications shown in Figures 3 and 5. In the illustrated embodiments, the fluid connection is configured as shown in Figure 5, that is, having a threaded Luer connection 75 and an external O-ring 72. Alternatively, the fluid connection and sealing portion may be configured as shown in Figures 3 and 4.

[0162] In particular, as can be seen in Figure 2, and in Figures 6 and 7, the outer circumferences of the snap-type arms 32 and 31 are circular when viewed in cross-section in all embodiments. Therefore, the snap-type shape is equivalent to an arc section when viewed in cross-section perpendicular to the axis of the transducer protection device. This configuration provides the effect of centering the transducer protection device when it is pressed axially in the direction 40 toward the opposing element on the mechanical interface side.

[0163] As shown in Figures 6, 7, and 16, the bracket is therefore formed by semicircular or common circular elements. The recesses shown in Figures 3 to 5 with respect to the opposing elements equally have a circular or semicircular configuration.

[0164] Here, further variations of the transducer protection device and pressure transducer interface are described with reference to Figures 8 to 12. Below, only those variations that differ from the embodiments described so far will be described in detail. In other respects, the descriptions of the embodiments presented above also apply to the embodiments shown in Figures 8 to 12.

[0165] The first embodiment of the transducer protection device described so far has a snap-type shape on the outside of the snap-type arm, but the second to fourth embodiments shown in Figures 8 to 10 include a snap-type shape on the inside of the snap-type arm and therefore engage with an opposing snap-type shape located on the outside of the opposing element.

[0166] In particular, a snap-fit ​​shape 33' including a chamfered section 35 and a hook section 36 is provided inside the snap-fit ​​arms 31 and 32 to engage with a hook section 92 provided on the outside of the tubular element of the pressure transducer interface.

[0167] Furthermore, the snap arms 31 and 32 have a first section extending from the connection point 34 with the main body toward the first side of the transducer protectors 100, 100', and 102', and a second section extending from the connection point 34 toward the second end and the pressure transducer interface. By applying pressure to the outside of the first section, the first section of the snap arm can be bent inward toward the main body, causing the second section, including the snap shape 33', to move away from the main body and releasing the snap connection. Accordingly, in the embodiments shown in Figures 8 to 10, the handling section 103 is provided on the first section between the connection point 34 with the main body and the free end of the first section toward the first end. In particular, the handling section 103 is provided by a ring section projecting outward from the free end of the first section.

[0168] The fourth embodiment shown in Figure 10 is otherwise similar to the first embodiment shown in Figures 1 to 5, wherein the main body is formed by a first tubular element 20 of the first connector and a second tubular element 37 of the second connector, with a step section 51 between them to which the film is bonded from the second side. Bonding of the hydrophobic film is performed by thermal bonding, ultrasonic welding, or adhesion. A preferred method for bonding the film to the sealing layer is ultrasonic welding.

[0169] In this embodiment, the two snap arms 31 and 32 extend along the outer surface of the tubular section 37, and a gap is formed between the outer surface of the tubular section 37 and the inner surfaces of the snap arms 31 and 32 along the entire axial length to simplify the mold for injection molding the transducer protector. The two snap arms 31 and 32 are connected to each other through a connecting element extending between them, and further connected to the tubular section 37 at a position between the two snap arms. In this embodiment, the connecting element is ring-shaped.

[0170] The sealing and fluid connection portions of this transducer protection device can be configured as shown in Figures 3 to 7, requiring only a different configuration of the opposing element for a snap-type shape with a hook section provided on the outside rather than the inside of the opposing element.

[0171] In both the first and fourth embodiments, and the fifth and sixth embodiments described below, the entire transducer protection device is injection-molded as a single unit, and the membrane is provided from the second side of the flow path.

[0172] In contrast, in the embodiment shown in Figure 8, the main body is manufactured from two shells, as in the prior art solution, and the membrane 60 is located in a larger intermediate section positioned between the first tubular section 20 of the first connector and the second tubular section 37 of the second connector, with the two shells welded together. In this embodiment, snap-type arms 31 and 32 are attached to connection points 34 on the outer circumference of the larger intermediate section 102.

[0173] Furthermore, the fluid connection between the second tubular section 37 and the interface is not provided on the basis of an O-ring as in other embodiments, but rather by a Luer connection between the tubular section 37 and a Luer cone 76 of a standard Luer connection, the same standard threaded section 75 provided for engaging with a standard Luer connector.

[0174] Therefore, the interface shown in Figure 8 is equivalent to both the conventional Luer connection of the transducer protection device and the second embodiment of the transducer protection device of the present invention that uses a snap connection.

[0175] In contrast, in the embodiment shown in Figure 9, interface 90' ​​is configured to be used only with the embodiment of the converter protection device according to the present invention.

[0176] In this embodiment, the external snap-type elements described above with respect to Figures 8 to 10 are also used. In this embodiment, the sealing portion is provided by an elastomer component 65 which is part of the transducer protection device, and the membrane is overmolded on the elastomer component. In particular, this pressure transducer interface may include a conical section 91 that engages with a conical section provided at the second end of the flow path, and the elastomer material is provided as an elastomer layer on the conical section of the transducer protection device. In this embodiment, the connection portion 34 between the snap-type arms is provided on the outer circumference of the conical section of the transducer protection device, and the conical section is connected to the tubular section 20 by a stepped portion. The elastomer material may be TPE in particular. Thus, in this embodiment, the membrane is essentially coupled to the main body of the pressure transducer from the second side at the second end of the flow path.

[0177] In the embodiments shown in Figures 8 and 9, the snap-type arms 31 and 32 are connected to the main body of the converter protection device at a circumferential position of the main body between the snap-type arms 31 and 32, similar to the embodiment shown in Figure 10.

[0178] Figures 11 and 12 show two modifications of the first embodiment of the transducer protection device. Both embodiments have internal snap-in elements similar to the first embodiment and the same basic configuration.

[0179] The embodiment shown in Figure 11 has less mass and material consumption than the first embodiment by providing notches 38 within the snap arms 31 and 32 that extend from the first side to the second side, thereby dividing the circumference of the snap arms into several arm sections on the first side of the snap arms. In the area of ​​the notches 38, the second tubular section 37 is already terminated at the step section 51 and does not extend further toward the first side.

[0180] The distal end of the remaining section of the snap-fit ​​arm is connected to the second side of the transducer protector by a partial ring section. In this embodiment, the snap-fit ​​shape is provided only where the material of the snap-fit ​​arm extends, and not in the circumferential portion where the notch 38 is located.

[0181] In the embodiment shown in Figure 12, two additional wings or snap arms 39 are provided between snap arms 31 and 32. However, the user only needs to press snap arms 32 and 32' to remove the transducer protection device, and the additional wings 39 are included only to improve alignment when the opposing element of the pressure transducer interface is provided as a circular recess.

[0182] In this embodiment, a snap shape is provided on the free end of the wing 39 for snapping into an opposing element. However, the snap angle of the snap shape on the wing 39 is not 90 degrees so that they disengage only due to axial disengagement movement and there is no need to press to disengage the snap connection.

[0183] In contrast, in all embodiments, the snap connection provided by the snap arm 31 is disengaged only by applying radial pressure to the snap arm. In particular, the snap shape 33, especially the hook section 36, and the snap angle of the corresponding hook section on the opposing element are basically 90 degrees with respect to the first and second snap arms 31 and 32.

[0184] In all embodiments, the snap-fit ​​connection allows for decisively easy handling. Furthermore, in embodiments where the main body of the transducer protection device is provided as a single unit manufactured by injection molding, or where the membrane is coupled to the main body from the second side of the flow path, manufacturing is simplified compared to the two-shell design of prior art solutions.

[0185] Figure 17 shows a tube set 200 including a transducer protection device 10 connected to a component of an extracorporeal blood tube set by line 220. In this embodiment, the component to which the transducer protection device 10 is connected by line 220 is a venous air capture chamber 210. Connected to the chamber 210 are connection lines 230 and 240 for connection to venous and arterial lines, as well as yet another connection line 250.

[0186] The end of line 220 is inserted into and bonded to the connector 20 of the transducer protection device 10. The distal ends of connecting lines 230, 240, and 250 are provided with connecting elements such as Luer lock connectors to provide a releasable connection to yet another line or component of the extracorporeal blood circuit.

Claims

1. The main body including the flow path, A first connector for fluidly connecting the first end of the flow path to a pipe of the external circuit, A second connector for fluidly coupling the second end of the flow path to the pressure transducer interface, A hydrophobic gas permeable membrane is placed in the flow channel to separate the first end of the flow channel from the second end, A transducer protection device for protecting a pressure transducer connected to an external circuit, including, The second connector described above is a snap-type connector. A converter protection device characterized by the following features.

2. The second connector is configured to snap-engage with the pressure transducer interface by a single axial movement in the direction of the flow path toward the second end, Preferably, the second connector includes at least one cantilevered snap-type element. The snap-type element is preferably a snap-type arm having a free end including a snap-type shape for connecting to the main body of the transducer protection device and snap-engaging to an opposing element of the pressure transducer interface, and more preferably the snap-type arm extends from a connection point where it is connected to the main body of the transducer protection device in a direction substantially along the flow path of the transducer protection device toward the pressure transducer interface. The converter protection device according to claim 1.

3. The snap-type connection provided by the second connector is a releasable connection, Preferably, the second connector is configured such that the snap connection can be released by applying pressure to the handling section of the snap element, thereby bending at least one snap element. The snap-type element is preferably configured to be released by pressure acting on the handling section of the snap-type element from the outside toward the main body of the connector. A converter protection device according to any one of claims 1 to 2.

4. The second connector comprises at least two separate snap-type elements, which are preferably located at the second end of the flow path on both sides of the axis defined by the flow path. More preferably, the snap-type connection provided by the second connector can be released by pressing the handling sections of the snap-type elements toward each other from the outside. A converter protection device according to any one of claims 1 to 3.

5. The second end of the flow path is configured as a tubular element that will be sealed and engaged with the flow path of the pressure transducer interface. Preferably, one or more snap-fit ​​elements of the second connector extend outside and at a distance from the tubular element toward the pressure transducer interface from the connection point with the main body of the transducer protection device, and the one or more snap-fit ​​elements are deformable toward and / or away from the tubular element. A converter protection device according to any one of claims 1 to 4.

6. The snap-type shape of the second connector is configured to snap-engage from the inside with the opposing element of the pressure transducer interface. Preferably, the handling section for at least one snap-type element of the second transducer is located between the connection point where the snap-type element is connected to the main body of the transducer protection device and the free end of the snap-type element configured to be connected to the pressure transducer interface. Converter protection device according to any one of claims 1 to 5.

7. The second connector includes at least one snap-type arm extending along the flow path of the transducer protection device toward the pressure transducer interface, The length of the snap-type arm in the direction determined by the flow path is at least 50%, preferably at least 65%, and more preferably at least 80% of the length of the flow path, and / or the snap-type element or snap-type shape of the second connector has a basically circular shape at the second end of the flow path with respect to the axis determined by the flow path. A converter protection device according to any one of claims 1 to 6.

8. The main body including the flow path, A first connector for fluidly connecting the first end of the flow path to the pipe of the external circuit, A second connector for fluidly coupling the second end of the flow path to the pressure transducer interface, A hydrophobic gas permeable membrane is placed in the flow channel to separate the first end of the flow channel from the second end, A transducer protection device for protecting a pressure transducer connected to an external circuit, including, a transducer protection device according to any one of claims 1 to 7, The transducer protection device includes an integrally molded component comprising the entire flow path and preferably both the first and second connectors, and / or the hydrophobic gas permeable membrane is coupled to a stepped portion of the transducer protection device, the coupled area of ​​the hydrophobic gas permeable membrane being accessible from the second end of the flow path, and the stepped portion is preferably provided within the flow path or at the second end of the flow path. A converter protection device characterized by the following features.

9. At the second end of the channel, preferably between the second end and the hydrophobic gas permeable membrane, the inner diameter and / or cross-section of the channel is larger than the outer diameter and / or outer shape of the hydrophobic gas permeable membrane, and / or The inner diameter and / or inner cross-section of the step portion is larger than the inner diameter and / or cross-section of the first connector and / or the pipe connected thereto. A converter protection device according to any one of claims 1 to 8.

10. A pressure transducer interface configured to connect to the second connector of a transducer protection device as defined in any one of claims 1 to 9, A flow path coupled to a pressure transducer, A snap-type opposing element for engaging with the snap-type shape of the snap-type element of the second connector, A pressure transducer interface including a pressure transducer interface.

11. The snap-type opposing element is formed by a bracket having an intermediate section for engaging with the snap-type shape of the snap-type element of the second connector, which extends freely between two connection sections to which the snap-type element of the second connector is connected to the main surface of the pressure transducer interface. Preferably, the main surface is a basically flat surface extending therefrom in the direction from which the bracket faces the transducer protection device, and / or The pressure transducer interface includes a threaded section configured to engage with another type of transducer protection device, including a Luer connector, in addition to the snap-type opposing element. The pressure transducer interface according to claim 10.

12. A tube system, A converter protection device according to any one of claims 1 to 9, At least one component of an extracorporeal blood circuit, Includes, The components of the extracorporeal blood circuit are connected to the first connector via a tube, preferably bonded to or inserted into a section of the first connector. Preferably, the tube is a tube extending from the venous chamber of the extracorporeal blood circuit to transport air across the hydrophobic gas permeable membrane. Tube system.

13. A pressure transducer interface according to either claim 10 or claim 11, and / or The tube system according to claim 12, Blood treatment machines, including dialysis machines.

14. Use of a transducer protection device according to any one of claims 1 to 7, for connecting the pipe of the external circuit to the pressure transducer, and the snap-type element of the second connector of the pressure transducer to the snap-type opposing element of the pressure transducer interface of the blood treatment machine, particularly the blood treatment machine according to claim 13.

15. A transducer protection device for an external circuit, comprising a main body including a flow channel, a first connector for fluidly coupling a first end of the flow channel to a pipe of an external circuit, a second connector for fluidly coupling a second end of the flow channel to a pressure transducer interface, and a hydrophobic gas permeable membrane disposed in the flow channel to separate the first end of the flow channel from the second end, a method for manufacturing a transducer protection device according to any one of claims 1 to 9, A step of integrally molding the main body of the protective device, which includes the entire flow path and preferably both the first and second connectors, and / or The step of coupling the hydrophobic gas permeable membrane to the step portion of the converter protection device by accessing the coupling area of ​​the hydrophobic gas permeable membrane from and preferably through the second end of the flow path, wherein the step portion is preferably provided in the flow path or at the second end of the flow path. A method that includes this.

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