Pressure cartridge holder for extracorporeal blood therapy machines

Abstract

The present invention relates to a pressure cartridge holder (1), which is attached or attachable to the housing of an extracorporeal blood treatment machine, in particular a dialysis machine, and comprises: a clamping device (12; 17; 21; 23, 24, 25), which is designed to hold the pressure cartridge (2) inserted into the pressure cartridge holder (1) by surrounding or engaging the pressure cartridge (2); and an ejector mechanism (15; 18; 22), which is designed to eject the pressure cartridge (2) when the clamping device (12; 17; 21; 23, 24, 25) is released.

Description

Technical Field

[0001] The invention relates to a pressure cartridge holder which is attached or attachable to the housing of an extracorporeal blood treatment machine, in particular a dialysis machine, having clamping means adapted to clamp or engage a pressure cartridge inserted into the pressure cartridge holder. Background Art

[0002] Extracorporeal blood treatment machines, particularly dialysis machines, have a conduit system, particularly a dialysate circuit and an extracorporeal blood circuit. These circuits comprise numerous dialysate and blood (flexible) lines that pass through and / or connect various functional units of the extracorporeal blood treatment machine, such as the dialyzer and blood pump. To ensure smooth function of the extracorporeal blood treatment machine, pressure monitoring of this conduit system, particularly the blood flexible lines, is necessary at several points. For example, in conventional dialysis machines, a PA port is provided to monitor arterial negative pressure, a PBE port is provided to monitor the inlet pressure upstream of the dialyzer, and a PV port is provided to monitor venous pressure.

[0003] For pressure monitoring purposes, a pressure cartridge or so-called POD (Pressure Operated Directional Valve) is typically installed at a suitable point in a pipeline or blood hose line, such as the commercially available Medisystems Streamline system. The corresponding POD or pressure transducer capsule comprises a volumetrically rigid capsule divided by a membrane into two chambers: more precisely, a blood chamber connected to the blood catheter system and a fluid chamber, more precisely, a gas or air chamber, which is connected to a pressure sensor or associated port of an extracorporeal blood treatment machine via a thin hose or pressure transmission line. The corresponding port is typically equipped with a Luer connector that requires screw actuation for connection to the pressure transmission line. Because the pressure transducer capsule is suspended in the catheter system's hose line and thus floats in an imprecisely defined, unstable position, measurement inaccuracies can occur. During operation, the internal line pressure present in the catheter system, and therefore in the first chamber, is transmitted via the membrane to the second chamber, generating a fluid pressure, particularly a gas pressure, in the second chamber that depends on the internal line pressure. The pressure sensor, connected to the second chamber via the thin hose, thus receives the fluid pressure signal, which is converted into an electrical signal. Thin, flexible hoses that create a large fluid or air path and dead volume between the pressure transducer capsule and the pressure sensor produce a low-pass effect, so that the accuracy of the measurement and the response time of the pressure sensor are disadvantageously limited.

[0004] Alternatively, from DE 10 2006 016 846 B4, it is known to directly connect a pressure box with an air side (without an intermediate hose) to a pressure sensor. In addition, WO 2014 / 099 767A1 and US 8 210 049B2 disclose a detachable holder for a pressure box, which is attached to a housing or a permanent frame. This means that pressure transducer capsules or PODs are known, which are directly or by volume rigidity and short connection connected to the pressure sensor. Its disadvantage is that the connection (such as Luer lock connection or bayonet connection) mentioned exemplarily therein is assembled and / or disassembled complicated and / or may not meet the requirements for connection tightness. For example, a Luer lock connector must be tightened with a screw, so assembly is time-consuming, and in addition, if the screw connection is too tight, then the individual Luer components may be firmly pressed against each other, making them difficult to disassemble or even damaging them. In short, today's systems with Luer lock connections can present a state of opening / disconnecting, tight / closing or loosening / leaking (not properly connected). Summary of the Invention

[0005] The object of the present invention is to improve or eliminate the disadvantages of the prior art. In particular, a pressure cartridge holder is to be provided which enables easy assembly and disassembly of the pressure cartridge and, in particular, still provides a very tight connection to the fluid chamber, in particular the air chamber, of the pressure cartridge.

[0006] The object of the present invention is achieved by the pressure measuring assembly according to the invention.

[0007] More precisely, the object is achieved by a pressure cartridge holder which is attached or attachable to the housing of an extracorporeal blood treatment machine, in particular a dialysis machine. A clamping device is provided which is suitable for clamping or engaging the pressure cartridge around a pressure cartridge inserted into the pressure cartridge holder; and an ejection mechanism which is suitable for ejecting the pressure cartridge when the clamping device is released. The interior space of the pressure cartridge is divided, in particular, by a membrane into a blood chamber and a fluid chamber. Preferably, the pressure cartridge holder has a pressure transmission line which is configured to be fluidically connected to the fluid chamber of the pressure cartridge and to transmit the fluid pressure present in the fluid chamber to a pressure sensor of the extracorporeal blood treatment machine.

[0008] The pressure transmission line is, for example, a pressure transmission channel which can be connected to the fluid chamber at its line / channel end facing the possible inserted pressure cartridge, in particular when the capsule / cartridge is inserted into the holder (automatically / without performing an assembly step other than insertion). Furthermore, the pressure transmission channel can have a port (at the channel / line end opposite the possible inserted pressure cartridge) which can be connected to a further (pressure transmission) line or directly to a pressure transducer (pressure sensor).

[0009] In other words, a clamping device or holding device is provided, which holds a pressure cartridge (capsule / cartridge for short) and has a mechanism that automatically ejects the capsule when the user simply removes the capsule from the pressure cartridge holder (holder for short), i.e., the capsule is automatically moved out of the holder by a simple actuation by the user, in such a way that a simple actuation is required to re-engage the capsule with the clamping device. If applicable, the ejection mechanism also at least partially releases the airtight connection between the capsule and the pressure transmission line / channel of the extracorporeal blood treatment machine.

[0010] For example, the ejection mechanism is at least partially formed by a spring mechanism. In this case, the capsule remains against the restoring force of the spring mechanism, and even in the presence of frictional forces, the spring mechanism presses the capsule out of the pressure cartridge holder as soon as the clamping device is released. In particular, in this case, a sufficiently long spring deflection should be provided to allow the user to easily grasp the pressure cartridge, or preferably, to allow the pressure cartridge to be completely ejected from the pressure cartridge holder and to hang only on the line attached thereto.

[0011] According to the pressure box holder of the present invention, in particular the interaction between the clamping device and the ejection mechanism, in particular the spring mechanism, on the one hand achieves very accurate, stable positioning of the capsule without the need to adjust the holder in addition, which makes it possible to quickly and easily assemble the pressure box, and on the other hand ensures that the pressure box can be quickly and easily assembled and disassembled. In addition, the fact that the capsule can be retained in the holder in a limited manner and can be ejected in a targeted manner by the ejection mechanism means that the situation of loose / leakage connection between the pressure transmission line and the fluid chamber can be avoided (for example, due to incorrect Luer lock connection). That is, by targeted ejection, there is only "connected" and "unconnected" states. In addition, in particular, the engagement of the pressure box when it is inserted in the holder provides tactile and / or visual and / or auditory feedback for correct connection. Various embodiments of the present invention that can achieve corresponding engagement are described in more detail below.

[0012] In other words, the shell of the extracorporeal blood treatment machine or the pressure box holder as a part thereof has a device and one or more elements for keeping the pressure box in a form-fitting manner, such as a spring or a guide rod, which produce a force acting against the direction of insertion. This / these elements are provided / installed in the pressure box holder in such a way that at least during the release of the capsule from the holder, the pressure box kept or inserted therein can be subjected to a pressure (spring force) acting opposite to the direction of insertion (that is, from the inside to the outside) that the pressure box can be inserted into the holder. This supports removing the capsule from the holder or causes the capsule to be ejected. Preferably, the pressure box is inserted into the pressure box holder from the front or the front panel of the shell of the extracorporeal treatment machine so that it is clearly visible and easily accessible. However, it can also be inserted from the side, from above or from below (that is, parallel to the shell).

[0013] Since the pressure cartridge holder is mounted or integrated directly on the exterior of the housing of the extracorporeal blood treatment machine, it is further ensured that the fluid chamber or air chamber of the pressure cartridge is connected via a short, rigid pressure transmission line to a pressure sensor, which is arranged inside the housing (inside the housing of the extracorporeal blood treatment machine), preferably directly behind the pressure cartridge holder, and converts the pressure signal from the pressure cartridge into an electrical measurement signal. Therefore, due to the arrangement of the pressure cartridge in the pressure cartridge holder, highly accurate and reliable pressure measurements are possible during operation of the extracorporeal blood treatment machine.

[0014] The ejection mechanism, in particular the spring mechanism, can provide the pressure for ejecting the pressure cartridge by installing the at least one compression spring in the holder in such a way that the at least one compression spring is located behind the pressure cartridge inserted in the holder in the insertion direction. Alternatively, an arrangement with a tension spring is also conceivable. Mechanical springs such as coil springs, bending springs / leaf springs or disc springs (i.e., elastically deformable components that provide elastic restoring force in a deformed state) or pneumatic springs can be used individually or in combination (in parallel and / or in series) as the spring for the spring mechanism. Possible embodiments of the clamping device will be described in more detail later.

[0015] Advantageous embodiments are explained in more detail below.

[0016] According to a preferred aspect of the present invention, the ejection mechanism comprises a spring mechanism having a pressing part which is spring-mounted in such a way that the pressing part is pre-tensioned when the pressure box is inserted and presses against the pressure box in a holding state in which the pressure box is held by a clamping device.

[0017] In other words, the spring mechanism is designed to press against the pressure box from the rear (relative to the insertion direction of the pressure box into the holder), that is, essentially between the housing and the pressure box. In addition, instead of the spring pressing directly against the pressure box, an intermediate piece in the form of a pressure element is provided, whereby the ejection force generated by the spring mechanism can be uniformly and smoothly transmitted to the pressure box. To this end, the pressure element can, for example, be annular and abut the outer edge of the pressure box and / or can form a groove for receiving the body of the pressure box. The pressure element preferably has a metal (in particular pressure-resistant) rod.

[0018] Preferably, the clamping device is mounted on the housing via a shaft, wherein the pressure element is received in the shaft and is spring-mounted. The diameter of the shaft can essentially correspond to the extension of the clamping mechanism, making the resulting connection particularly robust, providing ample space for (partial) receiving the spring mechanism or the pressure element and avoiding unnecessary intersections and edges, or it can be substantially narrower than the pressure cartridge holder, which is more cost-effective and lighter. Furthermore, a specific distance between the housing and the clamping device can be adjusted or adjustable via the shaft to facilitate insertion of the blood line. Furthermore, sufficient space is provided for all-around protected reception of the pressure element and its suspension / storage.

[0019] Further preferably, a preferably conical retainer port element (referred to as port element), further preferably a Luer connector is arranged or formed at the outer end of the pressure element, the conical retainer port element preferably being made of soft plastic. The port element is complementary to the fluid / air chamber port element of the fluid chamber or air chamber of the pressure cartridge. For example, if the pressure cartridge has a female Luer connector, preferably a Luer slip connector, the port element is formed as a male Luer (slip) connector, and vice versa. Alternatively, for example, a front sealing surface can be provided, which can be pressed against a complementary surface of the pressure cartridge by a spring mechanism. In this case, the ejection mechanism is particularly used to apply force or press the connection between the capsule and the retainer.

[0020] The conical shape of the port element creates a particularly strong connection between the pressure cartridge and the pressure cartridge holder that is insensitive to slight misalignments and is guided during insertion. Furthermore, an additional, easily manually removable connection may exist between the port element of the fluid / air chamber of the pressure cartridge and the port element of the pressure cartridge holder, which maintains the pressure cartridge in place even when the clamping device is removed. In particular, the conical shape of the port element can act as a wedge, for example, to provide a press-fit or friction-fit connection. Thus, when the clamping device is released, the pressure element, along with the pressure cartridge, is moved out of the retaining position by the ejection mechanism, preventing the clamping device and the pressure cartridge from re-entering the clamped / engaged retaining connection. Due to the easily manually releasable additional connection, particularly the wedge-shaped connection, the capsule and the blood line connected thereto cannot simply fall off when the clamping device is released, but must be separately released or removed by the user for removal.

[0021] It has proven useful to attach a seal, preferably an O-ring, to the preferably tapered port element of the pressure cell, or to design the port element as a seal. In particular, the seal can be located at the contact surfaces of the port elements. This achieves the tightness between the port of the pressure cell and the pressure cell holder that is essential for particularly accurate pressure measurement. Furthermore, the seal can serve as the additional, easily manually removable connection, thus fulfilling a dual function.

[0022] Alternatively, the seal can be attached to the inner surface of the shaft on the shaft inlet side of the pressure element, in such a way that it rests radially on the outside of the fluid / air chamber port element of the pressure cell, or more precisely, on the seal contact surface provided thereon, allowing for proper re-engagement when inserted into the retainer. Alternatively, the seal can be arranged radially on the outside of the pressure cell, and the inner surface of the shaft can be formed accordingly as the seal contact surface. The latter option offers the advantage of simpler manufacturing of the seal seat and easier replacement of the O-ring, i.e., easier maintenance. In these cases, when the clamping device is released, an ejection mechanism moves the seal axially relative to the opposing seal contact surface. To protect the seal, it is advantageous if the seal contact surface and / or the surface to which the seal is attached are at least slightly inclined. On the other hand, it is advantageous if these surfaces are straight cylindrical, as this ensures a consistent sealing effect even if the axial positions of the pressure cell and retainer deviate. In a pressure cartridge holding device formed in this way, the compression member may be omitted and an alternative ejection mechanism or spring mechanism may be provided, for example at an abutting portion of the outer surface of the capsule.

[0023] Preferably, a pressure transmission line is disposed in the pressure element, which is connectable to the pressure cartridge to transmit the pressure of the pressure cartridge to a pressure sensor of the extracorporeal blood treatment machine. In particular, it is advantageous if the spring force of the spring mechanism is set so as to press the pressure element, in the retained state, against the pressure cartridge in a manner that provides an airtight connection between the two. Thus, the port element of the pressure element, pressed or pressurizable against the seal of the pressure cartridge by the ejection mechanism, in particular the spring mechanism, provides a tight and secure connection between the fluid chamber or air chamber of the pressure cartridge and the pressure transmission line, which connects the capsule to the pressure sensor, preferably disposed in the housing of the extracorporeal blood treatment machine. Alternatively, the pressure sensor can be disposed in a shaft directly connected to the pressure element. In particular, the spring mounting also compensates for deviations in the insertion direction (i.e., the effective direction of the spring mechanism) when attaching the pressure cartridge. Alternatively, the pressure transmission line can be disposed in the shaft and connected to the pressure cartridge accordingly. In this case, the pressure element is disposed within or on the pressure transmission line and is not sealed to the capsule.

[0024] According to another aspect of the present invention, at least one wall portion is provided, which defines a receiving chamber for receiving the pressure cartridge. A surface substantially perpendicular to the wall portion can serve as the bottom of the receiving chamber, preferably in which a spring mechanism is received, in particular an axis is arranged. The wall portion can protrude from the bottom of the receiving chamber in such a way that the pressure cartridge is preferably completely contained therein. In addition, at least two opposing wall portions are preferably provided, defining a receiving chamber between them. The capsule is protected in the holder by the wall portions and is not easily damaged by collisions, careless movement, etc. Preferably, the pressure cartridge is inserted into the pressure cartridge holder from the front, i.e., toward the bottom and parallel to the wall portions. However, in principle, it is also possible to insert the capsule into the holder from the side or from above, in particular between two or more wall portions. If necessary, in this case, guides for the capsule can be provided on the wall portions.

[0025] Advantageously, at least one of the wall sections is provided with a slit for receiving at least one blood chamber port of the pressure cartridge. Thus, the slit serves to secure the position of the capsule relative to the capsule's blood chamber port or to fix the position of its blood chamber port. The slit is generally U-shaped and / or adapted to the diameter of the blood chamber port, such that it guides the pressure cartridge during insertion and, in the inserted state, holds it in place with a positive fit in three directions (i.e., in the direction of the slit ends and transversely to said directions on both sides). This means that the slit can be used to receive and guide the capsule portion. Thus, insertion in an incorrect orientation is virtually prevented. The slit also ensures that the pressure cartridge is secured in place in three directions, even during treatment. If the slit extends primarily in the direction of insertion of the capsule into the holder, this is also referred to as an axial slit. For example, if the (axial) slit extends perpendicular to the bottom of the receiving chamber, in particular toward the housing of the extracorporeal blood treatment machine or parallel to an axis, rotation of the pressure cartridge during extracorporeal blood treatment can be prevented.

[0026] Furthermore, it is preferred to form the inner circumferential surface of at least one wall portion to serve as a guide for the pressure cartridge. For example, the capsule may be substantially circular in the insertion direction, and the inner circumferential surface may have a corresponding diameter or curvature. This, along with the provision of the slit, prevents the capsule from tilting and thus improper connection.

[0027] According to an advantageous embodiment, the clamping device forms at least one slide-in fitting hook, which is designed to engage behind the pressure cartridge when the pressure cartridge is inserted. That is, at least one hook is provided, which protrudes on the pressure cartridge holder in particular parallel to the at least one wall portion in the insertion direction of the pressure cartridge and has a nose at its free end that protrudes towards the interior of the pressure cartridge holder (i.e., protrudes into the receiving chamber). The one or more slide-in fitting hooks can be bent outwards in a spring-like manner, in particular by the capsule contacting the nose and pressing it outwards when inserted into the holder. This makes it particularly quick and easy for the user to insert the pressure cartridge into the holder. The one or more slide-in fitting hooks can also form (another) wall portion that forms the receiving chamber in addition to or as an alternative to the one or more wall portions mentioned above.

[0028] For example, a single snap-on hook can be provided, which is advantageous because the connection can be released with one hand. That is, to release the clamping device from the pressure cartridge, the user simply bends the single snap-on hook outward with one hand. The ejection mechanism, particularly a spring mechanism, then pushes the capsule out of the clamping device in a manner that prevents reengagement after the snap-on hook is released. In this case, a first wall portion can be provided that defines the receiving chamber and preferably surrounds the receiving chamber by at least half, more preferably by more than two-thirds. The first wall portion can particularly include two slits extending perpendicularly to the bottom of the receiving chamber for receiving the blood chamber port. In this case, the snap-on hook can be arranged in a gap in the first wall portion to form the second wall portion. Alternatively, two opposing snap-on hooks can be provided, each released with two hands. In particular, the two wall portions with slit ends can be formed between the snap-on hooks, offset at an angle (preferably 90°) to the snap-on hooks.

[0029] The pressure cartridge holder according to this embodiment can be injection-molded, for example, wherein at least one wall portion, at least one snap-fit ​​hook, the bottom of the receiving chamber and, if applicable, the shaft are manufactured as a single piece of material. This allows for a particularly cost-effective production of the pressure cartridge holder.

[0030] In other words, the holder is provided with one or two (plastic) hooks designed to block the pressure cartridge (POD) and hold it in place. Furthermore, the (plastic) hooks are adapted to easily release the pressure cartridge and release the capsule using one or two fingers, one finger for each hook.

[0031] According to a further advantageous embodiment, the at least one slit is a circumferential slit extending transversely to the insertion direction, in particular in a circumferential direction around the receiving chamber, by which the clamping means is separated on the outside (opposite the bottom of the receiving chamber) or is formed as at least one, preferably elastically bendable, clamp extending in the circumferential direction, wherein the at least one blood chamber port can be inserted into the circumferential slit or pushed under the clamp by rotating the pressure cartridge.

[0032] This means that the pressure cell holder according to this embodiment has preferably a circumferential wall which, together with the bottom, defines a receiving chamber. The wall has at least one slit which extends in the wall in a circumferential direction parallel to the bottom. At least one slit is open towards the edge of the wall. In order to achieve this, at least one slit is bent in the axial direction at its inlet (i.e. vertically or inclined away from the bottom) and / or the wall has a protrusion in each region in which one or more slits extend, wherein the individual slits are open laterally in the circumferential direction. Similar to the above-described embodiment, the pressure cell holder according to this embodiment can be manufactured in a particularly simple and cost-effective manner, in particular in a single piece of material, preferably by injection moulding.

[0033] In other words, the holder has two curved plastic hooks (clamps) designed to hold the pressure cartridge in place by hooking onto the hose connector / blood chamber port, wherein in the holder according to this embodiment, connection of the pressure cartridge (POD) is achieved by partially rotating the component (capsule). Similarly, disconnection / removal of the pressure cartridge is achieved by partially rotating the capsule in the opposite direction.

[0034] In order to insert the pressure cartridge into the pressure cartridge holder, in this embodiment, the capsule is positioned in such a way that one or more of its blood chamber ports are located at the entrance of the circumferential slit. The pressure cartridge is then (partially) rotated in such a way that the blood chamber ports move through the circumferential slit and stop / abut at their ends in the end position. This means that the capsule can be inserted into and removed from the holder in a bayonet-type manner, and the user can operate the capsule particularly quickly, easily, and with one hand.

[0035] In particular, it is advantageous if at least one circumferential slit widens at its (bag) end to provide a latchable port receptacle that defines the end position of the corresponding blood chamber port. Preferably, the size (diameter) of the port receptacle corresponds to the size of the blood chamber port. In this case, the clamp / wing formed by the circumferential wall can be elastically bent open so that the capsule and its blood chamber port are locked into the end position at the end of the slit, and the clamp / wing remains on the outside of the circumferential slit (facing in the direction opposite to the insertion direction or the bottom of the receiving chamber) or is partially separated from the circumferential wall by the circumferential slit. To this end, it is particularly advantageous if an indentation is provided at the outer / front edge of the wall near the circumferential end or the end of the port receptacle, i.e., behind the attachment of the clamp / wing. This indentation increases the flexibility or elastic expandability of the wing / clamp provided outside the circumferential slit, which means that the user requires less force, for example, to engage and disengage the pressure cartridge.

[0036] The spring mechanism can be configured as an ejection mechanism, wherein the circumferential slit preferably extends in the circumferential direction at least at its inner end opposite the inlet (optionally exclusively). Alternatively or additionally, the circumferential slit can extend slightly obliquely (i.e., surrounding the receiving chamber and extending obliquely toward the bottom), so that the circumferential slit forms a guide link as the ejection mechanism, and when the capsule is removed from the holder, the capsule also moves out of the holder perpendicularly to the bottom along the oblique path of the circumferential slit. Furthermore, the guide link formed in this manner can be used to achieve a contact force in the direction of the bottom and a port or seal provided thereon when the capsule is inserted.

[0037] According to another preferred embodiment, the clamping device comprises a sleeve-shaped turning bolt or an annular spindle rotatably mounted on the outer side of the at least one wall portion and having at least one L-shaped slit. The L-shaped slit has an axial portion that opens against the insertion direction at the (front) outer edge of the turning bolt. In the open position of the turning bolt, the axial portion overlaps with at least one axially extending slit provided in the wall portion, such that at least one blood chamber port can be inserted into the corresponding L-shaped slit and the axial slit. Furthermore, the L-shaped slit has a circumferential portion that forms a circumferentially extending slit end and is adapted to, in a closed position attainable by turning the turning bolt, together with the axial slit, hold the at least one blood chamber port in a fixed position. The pressure cartridge holder or clamping device according to this embodiment holds the pressure cartridge in a particularly stable and secure manner. It is also advantageous for the turning bolt to serve as a circumferential protective wall for the pressure cartridge. Optionally, the turning bolt can be mounted on a torsion spring so that it is preloaded in the closed position.

[0038] Similar to the embodiment described above with a circumferential slit, the ejection mechanism can be formed by a spring mechanism and / or a guide link, wherein in this case the guide link is provided by the circumferential portion of the L-shaped slit. If only a spring mechanism is provided, the circumferential portion preferably extends only in the circumferential direction. The guide link is formed in that the path of the circumferential portion of the L-shaped slit has an axial component in addition to its circumferential component (extending around the receiving chamber and obliquely in the direction of the bottom). Therefore, when the rotating bolt is turned / closed, the outer edge of the L-shaped slit presses against the corresponding blood chamber port, pushing the capsule into the receiving chamber / toward the bottom and pressing any seals between the fluid / air chamber port element of the capsule and the port element of the holder (e.g., a shaft or pressure element) against each other. If a spring-loaded pressure element is present, that is, if the ejection mechanism comprises both a spring mechanism and a guide link, the spring mechanism is supported by the lower edge of the L-shaped slit to eject the capsule when it is released. This is particularly advantageous due to the high contact force that can be achieved and any resulting interference, as the ejection requires less force and is more controlled due to the guide link. This means that automatic ejection of the capsule is provided when the capsule is removed.

[0039] In other words, the pressure cartridge holder is provided with a rotating outer ring adapted to be rotated or manually rotated during insertion of the pressure cartridge. Furthermore, the rotating outer ring may be adapted to push the capsule out (from the holder) during rotation.

[0040] According to a further advantageous embodiment, the clamping device forms a locking tab which is attached via a hinge-like joint or is displaceably mounted in such a way that in the closed position the locking tab extends over the pressure cartridge on the side opposite the spring mechanism in order to hold the pressure cartridge in the holder against the spring force of the spring mechanism.

[0041] Preferably, the locking tab forms a latching edge or latching hook / latch protrusion at the end opposite to the hinge to latch in the closed position with an associated hook or edge or groove rigidly provided on the holder. Preferably, the hook or protrusion is a slide-fit hook or stop, and latching occurs by snapping it on. Alternatively, a manually movable hook, bracket or pin (rotatably or slidably mounted) can be provided to establish an undercut retention engagement between the locking tab and the body of the pressure cartridge holder. In addition, it is advantageous if the locking tab is lattice-shaped so that the pressure cartridge, in particular the body including the air chamber and the blood chamber, can be seen even when the locking tab is closed.

[0042] In particular, if the locking tab is attached via a hinge-like joint, the locking tab can also be designed as a bending spring, which can apply an additional contact force to the pressure capsule inserted in the holder. Alternatively, it is conceivable to design the locking tab as a bending spring rigidly attached to the pressure capsule holder, which bends open to insert the pressure capsule and then (only) holds the capsule in the holder by its spring force.

[0043] In other words, the holder is equipped with a plastic cover designed to hold the capsule in place, wherein the plastic cover is held in the closed position by a hook. The capsule is retained by the cover. The holder is particularly equipped with a Luer lock connector.

[0044] In each of the above embodiments described, it is advantageous if the pressure cartridge holder is configured such that the main portion / body of the pressure cartridge having the blood chamber and the fluid / air chamber separated by a membrane is visible so that the user can easily monitor the positioning / adjustment of the membrane separating the two chambers.

[0045] In summary, the present invention addresses the objectives of a capsule (POD) by directly connecting it to an extracorporeal blood treatment machine or dialysis machine (its housing), whereby the pressure cartridge remains in the correct position during extracorporeal blood treatment (dialysis treatment). A retainer is designed to hold / secure the capsule to the front panel of the extracorporeal blood treatment machine. Furthermore, the retainer allows for checking the adjustment of the capsule membrane (the membrane separating the capsule's chambers). The retainer holds the capsule in the correct position and prevents rotation. The retainer allows for pressure transmission between the blood line and the extracorporeal blood treatment machine. This prevents the pressure cartridge from kinking relative to the hose (e.g., the pressure transmission hose line between the capsule's fluid / air chamber and the pressure sensor). The retainer allows for connection to a plastic hose. Furthermore, the retainer is designed to be easy to clean and can be easily removed from the machine for maintenance. Furthermore, the retainer can be equipped with a soft plastic connector (port element and / or seal) for connecting the capsule, wherein the connector ensures a seal with the capsule. The connector, made of soft plastic, is mounted on a metal shaft (pressure element). Furthermore, the retainer is designed to (automatically) eject the capsule when it is disassembled / removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Hereinafter, the present invention will be described with reference to preferred embodiments. However, these are merely illustrative in nature and are not intended to limit the scope of protection of the present invention. In addition, in the description of various embodiments, the same reference numerals are used for the same parts to avoid redundant description of the same parts.

[0047] Figure 1 A pressure cartridge holder according to the invention is shown according to a first embodiment and a pressure cartridge during an insertion process.

[0048] Figure 2 A pressure cartridge holder and a pressure cartridge held therein according to a first embodiment are shown.

[0049] Figure 3 A pressure cell holder according to the present invention is shown according to a modification of the first embodiment.

[0050] Figure 4 A pressure cartridge holder according to a modification of the first embodiment and a pressure cartridge held therein are shown.

[0051] Figure 5 A pressure cell holder according to the invention is shown according to a second embodiment.

[0052] Figure 6 A pressure cartridge holder according to a second embodiment is shown with a pressure cartridge inserted therein.

[0053] Figure 7 A pressure cell holder according to the invention is shown according to a third embodiment.

[0054] Figure 8 A pressure cartridge holder according to a third embodiment and a pressure cartridge inserted therein are shown.

[0055] Figure 9 A pressure cell holder according to the invention is shown according to a fourth embodiment.

[0056] Figure 10 A pressure cartridge holder according to a fourth embodiment and a pressure cartridge held therein are shown.

[0057] Figure 11 The spring mechanism is shown using the first embodiment as an example.

[0058] Figure 12 、 Figure 13 and Figure 14 An advantageous variant for attaching the seal using the example of the first embodiment is shown. DETAILED DESCRIPTION

[0059] Figure 1A first embodiment of a pressure cartridge holder 1 (hereinafter also referred to simply as holder 1) according to the present invention is shown, with a pressure cartridge 2 (hereinafter also referred to simply as capsule 2) inserted frontally therein (during the insertion process). The pressure cartridge 2 has a body 3, which in this example is substantially circular and forms a rigid capsule, the interior space of which is divided by a membrane 4 into two chambers, a blood chamber 5 and an air chamber 6, for pressure transmission. At the front side of the pressure cartridge 2 shown in this view, a blood chamber port 7 is provided, which is suitable for connecting the pressure cartridge 2, more precisely its blood chamber 5, to the blood hose line fluid of an extracorporeal blood treatment machine. On the rear side and not shown here, the pressure cartridge 2 has a preferably tapered air chamber port 8, in particular a Luer connector, which is connected to the air chamber 6 in a fluid-conducting manner.

[0060] In the following description of the embodiments, it should be noted that the pressure capsule 2 is described here by way of example and in all embodiments as being inserted frontally into the holder 1, which is open toward the front. Furthermore, since the capsule 2 is circular and the associated holder forms at least one correspondingly circular receptacle, the insertion direction will be referred to hereinafter as the axial direction, and the circumferential direction will refer to this circular shape. However, it will be understood that the pressure capsule can be formed in a different manner (e.g., cuboid), or that it can be inserted sideways into the holder without changing the functional principle of the invention.

[0061] The pressure cartridge holder 1 forms a pot-shaped receiving chamber 9 adapted to receive the pressure cartridge 2. The receiving chamber 9 has a wall or wall portion 10 on two opposite sides, forming part of a sleeve, whose inner circumference substantially corresponds to the outer circumference of the pressure cartridge 2, for receiving and guiding the pressure cartridge 2. The wall portion 10 has two diametrically opposed slits 11 (hereinafter referred to as axial slits) extending in the insertion direction, which are designed to receive the blood chamber port 7 of the pressure cartridge 2, thereby ensuring a rotationally fixed position of the pressure cartridge 2 relative to the pressure cartridge holder 1. Furthermore, the receiving chamber 9 has two slide-on hooks or spring hooks 12, which are opposite to each other and angularly offset (preferably by 90°) relative to the wall portion 10 and the axial slit ends 11 provided therein. When the pressure cartridge 2 is inserted, the slide-on hooks or spring hooks 12 elastically bend radially outwards and, when the pressure cartridge 2 has reached its final position, spring back or snap in, thereby clamping around the edge of the pressure cartridge 2, with the hook projections extending radially inwards. In other words, the spring hook 12 serves as a clamping device.

[0062] Furthermore, the pot-shaped receiving chamber 9 formed by the holder 1 has a bottom 13 in which a holder port 14 (holder port element / port portion of the holder), in particular a matching Luer connector, which is compatible with the air chamber port 8 (port portion of the capsule) of the pressure cartridge 2 is provided. The holder port 14 is spring-mounted in the holder 1, in particular in an opening in the bottom 13 of the holder 1, wherein an associated spring mechanism 15, which will be described in more detail later, is housed in a shaft 16 of the holder 1.

[0063] When the pressure cartridge 2 is inserted into the holder 1, the holder port 14 and the air chamber port 8 are connected to each other and are pressed together in a sealed manner by the spring mechanism 15. Furthermore, when the clamping device or spring hook 12 is released, the spring mechanism 15 serves to push or eject the pressure cartridge 2 out of the receiving chamber 9, i.e., it acts as an ejection mechanism. The spring deflection and spring force of the spring mechanism 15 are set accordingly. The shaft 16 of the holder 1 also serves to attach the holder 1 to the housing of the extracorporeal blood treatment machine. More specifically, the shaft 16 has a collar for contacting the housing of the extracorporeal blood treatment machine and, therefore, for defining the position of the holder 1 relative thereto.

[0064] Figure 2 A first embodiment of a pressure cartridge holder 1 according to the present invention is shown, with a pressure cartridge 2 inserted therein. It can be clearly seen that the blood chamber port 7 of the pressure cartridge 2 is located in the axial slit end 11 of the holder 1, and that the pressure cartridge 2 is thus secured against rotation. It can also be seen that the spring hooks 12 clamp around the edge of the pressure cartridge 2 and thus secure it in place in the axial direction / insertion direction.

[0065] Figure 3 and Figure 4 A modified version of the first embodiment according to the invention is shown, along with a pressure cartridge holder 1 having an inserted pressure cartridge 2. Apart from the modifications, this embodiment essentially corresponds to the first embodiment, which is why only the differences are explained below. Compared to the first embodiment, the pressure cartridge holder 1 shown here has only a single spring hook 12 as a clamping device. Furthermore, only one wall section 10 is provided, extending sleeve-like around the receiving chamber 9 and interrupted only in the region of the spring hook 12. This means that a single, continuous wall section 10 is provided where the second spring hook 12 would be located in the holder 1 according to the first embodiment.

[0066] Figure 5A second embodiment of the present invention is shown. This corresponds largely to the first embodiment described above and differs significantly from it in terms of the clamping device and the associated insertion method, as will be explained below. The receiving chamber 9 formed by the holder 1 is surrounded by a circumferential, sleeve-like wall 10 that is uninterrupted in the insertion / axial direction. On two diametrically opposed sides, the wall 10 forms axial extensions 17. In each of these extensions 17, a slit or circumferential slit 18 is provided that extends in the same circumferential direction (i.e., rotationally symmetrically) and partially surrounds the receiving chamber 9, and is intended to receive the blood chamber port 7 of the pressure cartridge 2. In other words, the extension 17 is separated or partially separated from the wall 10 by the circumferential slit 18, so that the extension 17 forms a clamp or wing extending from the wall 10 at the front (at the front edge) in the circumferential direction as a clamping device.

[0067] The circumferential slits 18 are each uniformly narrow along their course, with them slightly widening at their input end and opening toward the front / font side. In other words, the circumferential slits 18 may extend beyond the associated extension 17 into the middle portion of the wall 10, forming a kind of receptacle funnel at the transition between the extension 17 and this middle portion of the wall 10. Furthermore, the circumferential slits each form a rounded, expanded port receptacle 19 or widening at their other closed (sack) end to latch the blood chamber port 7. Behind the extension 17, on one side of the port receptacle 19, the wall 10 has an indentation 20, thereby increasing the flexibility of the clamp / wing formed by the extension 17.

[0068] In order to insert the pressure cartridge 2 into the holder 1, the pressure cartridge 2 is placed in / at the receiving chamber 9, as shown Figure 6As shown, this is done so that the blood chamber port 7 is located at the diametrically opposite input end of the circumferential slit 18 or the receiving funnel formed thereby. If the pressure cartridge 2 is now rotated circumferentially relative to the pressure cartridge holder 1 in a bayonet-like manner, the blood chamber port 7 slides through the circumferential slit 18, wherein the circumferentially extending clamp formed by the extension 17 elastically expands in the axial direction and, if applicable, slightly twists. When the blood chamber port 7 reaches the circularly expanded port receptacle 19 of the circumferential slit 18, the elastically deformed clamp retracts and thus locks the blood chamber port 7 in the end position formed by the port receptacle 19. During this insertion process, and during the complete reverse release of the capsule from the holder 1, the circumferential slit 18 (more precisely, the wall edge of the clamp and the wall edge of the rear wall portion surrounding the circumferential slit 18) serves as a guide link (if applicable) to form at least part of the ejection mechanism according to the present invention. Additionally or alternatively, a spring mechanism 15 (as will be described in more detail later) is provided at / in the bottom 13 of the holder as at least part of the ejection mechanism. The spring mechanism 15 and the guide link may also form a combined ejection mechanism.

[0069] Figure 7 and Figure 8 A third embodiment of the invention is shown. Like the previous embodiments, the holder 1 shown here has a pot-shaped receiving chamber 9. This receiving chamber 9 is formed by an inner sleeve with a bottom 13 and a wall with two diametrically opposite wall sections 10 extending in the insertion direction / axial direction. In the wall section 10, a similar Figure 1 , providing (corresponding) axial slits 11 for receiving the blood hose port 7 of the pressure cartridge 2. The inner surface of the wall portion 10 is used to receive and guide the outer circumference of the pressure cartridge 2. On the other hand, the outer surface of the wall portion 10 is used to rotatably hold and support the annular mandrel 21 relative to the receiving chamber 9. On the outer circumferential surface, the annular mandrel 21 has circumferentially distributed recesses, which are used to improve the user's grip. The annular mandrel 21 is a sleeve having two diametrically opposed, generally L-shaped slits 22. The slits 22 open in the same direction as the axial slits 11 toward the front / front edge of the annular mandrel 21, where they form an axial portion. In addition, each L-shaped slit 22 has a circumferential portion that is bent at an angle equal to or greater than 90° from the axial portion, thereby extending at least partially in a circumferential direction around the receiving chamber 9.

[0070] In order to fix the pressure cartridge 2 in the holder 1 of the third embodiment, the annular spindle 21 is rotated relative to the receiving chamber 9 so that the opening / input end of the axial slit 11 and the opening / input end of the axial portion of the L-shaped slit 22 are aligned with each other, as shown in FIG. Figure 8As shown. Subsequently, the pressure cartridge 2 is inserted into the receiving chamber 9 in such a manner that the blood hose port 7 is located between the axial slit end 11 and the axial portion of the L-shaped slit end 22. If the annular mandrel 21 is now rotated relative to the pressure cartridge 2, the circumferential portion of the L-shaped slit 22 slides over the blood hose port 7. In this way, the pressure cartridge 2 is secured against rotation by the axial slit 11 and secured in the axial direction by the circumferential portion of the L-shaped slit 22.

[0071] Similar to the second embodiment described above, the ejection mechanism may be provided by a spring mechanism 15 (as will be described in more detail later) provided in / at the bottom 13 of the holder as at least a part of the ejection mechanism, and / or as explained above with reference to the circumferential slit according to the second embodiment, at least a part of the ejection mechanism may be provided by the circumferential portion 19 of the L-shaped slit 22 that is inclined and serves as a guide link. The spring mechanism 15 and the guide link may also form a combined ejection mechanism.

[0072] Figure 9 and Figure 10 A fourth embodiment of the holder 1 of the present invention is shown, with and without a pressure cartridge 2 inserted. According to this embodiment, the holder 1 has a base plate forming a bottom 13, and a spring mechanism 15, in particular the spring mechanism 15 described later, is provided in / on the base plate as an ejection mechanism, as well as a holder port 14 compatible with the air chamber port 8 of the pressure cartridge 2. In this embodiment, an optionally pluggable port for quick assembly to a housing is provided on the rear side of the base plate, which is adapted to abut the housing in the assembled state. Furthermore, two opposing wall portions 10 are provided, each terminating flatly on the outside at an edge of the base plate in this example, extending perpendicularly to the base plate or in the insertion or axial direction. As in the above-described embodiments, the wall portions 10 form a circular inner circumferential surface for receiving and guiding the outer circumference of the pressure cartridge 2, and also have an axial slit 11 for receiving the blood chamber port 7 of the pressure cartridge 2.

[0073] Angularly offset (90°) from the opposing wall portion 10, a hinge bead 23 and a radially outwardly directed resilient locking hook 24 are also disposed opposite one another, projecting forwardly at the edge of the base plate. The hinge bead 23 forms a hinge, wherein the hinge axis extends parallel to the base 13 and the edge of the base plate, and a locking tab 25, hinged to the hinge, is rotatable about the hinge. Opposite the hinge bead 23, the resilient locking hook 24 forms an outwardly directed, snap-fit ​​hook (here, as an example) for engaging with the locking tab 22.

[0074] The locking tab 25 essentially forms a hinged frame with two longitudinal struts 26, said frame having a kink so that when closed, the locking tab 25 lies like a roof over the base 13, in particular centrally over the pressure box 2. Figure 10 As shown, near the kink, the locking tab 25 may provide a recess for receiving the pressure capsule 2, and an abutment ring 27 for abutting the capsule 2 to retain it in the holder 1 against the force of the spring mechanism 15. A transverse strut provided at the free end of the locking tab 25 forms an engagement edge 28 for positively retaining the locking hook 24.

[0075] To insert the pressure capsule 2 into the holder 1 according to this embodiment, the locking tab 25 is first opened or twisted outward / forward. The pressure capsule 2 is then inserted into the receiving chamber 9 in such a way that the blood chamber port 7 is located in the axial slit end 11 and the air chamber port 8 and the holder port 14 are connected to each other. The user then turns the locking tab 25 so that it presses, in particular with the abutment ring 27, against the body 3 of the pressure capsule 2 in order to press the capsule against the spring mechanism 15 and form an airtight connection between the air chamber port and the holder port 14. In the end position, the transverse struts are pushed over the locking hooks 24 so that the locking hooks 24 clamp / engage the engagement edge 28 and lock the locking tab 25.

[0076] Figure 11 A pressure cartridge holder 1 according to a first embodiment is shown in longitudinal section with a pressure cartridge 2 inserted therein, in order to illustrate the spring mechanism 15 according to the invention as an ejection mechanism or part thereof. It should be understood that the first embodiment has been chosen merely as an example, and that the same spring mechanism 15 can likewise be arranged in the modified first and fourth embodiments, and possibly also in the second and third embodiments, in each case in the base 13 of the corresponding holder 1, in particular in the shaft 16.

[0077] exist Figure 11The illustrated holder shows two diametrically opposed, snap-fit ​​hooks or spring hooks 12 that clamp around one edge of the pressure cartridge 2 inserted into the holder. Furthermore, the internal structure of the pressure cartridge 2 can be seen, comprising an outer blood chamber 5, an inner air chamber 6, a membrane 4 disposed therebetween, and one of the blood chamber ports 7. An air chamber port 8 is provided on the air chamber 6, in fluid communication therewith. When the capsule 2 is inserted, the air chamber port 8 protrudes into the shaft 16 of the holder 1 and has a conical inner surface. This conical inner surface is located on the holder port 14, which forms an outer cone. The outer cone is preferably provided with a soft plastic layer 29, particularly a silicone layer, as a seal (for sealing between the outer cone and the conical inner surface). The holder port 14 is mounted on a mechanically stable (deformation-resistant, particularly compression-resistant or rigid), preferably metallic, compression member 30, and together with the compression member 30 forms the pressure element. The compression member 30 extends through the shaft 16 and is mounted therein so as to be axially displaceable by a spring assembly 31, shown here as an example of a coil spring. The spring assembly 31 and the compression member 30 form the spring mechanism 15 as (possibly part of) the ejection mechanism. The compression member 30 has a port 37 at its inner end, which can protrude into the housing of the extracorporeal blood treatment machine, for example, for use with a pressure sensor. Furthermore, the compression member 30 and the spring 31 are housed in a sleeve that is screwed into the shaft 16 and can therefore be easily released, for example, for maintenance purposes.

[0078] Figure 12 、 Figure 13 and Figure 14 The pressure cell holder according to the first embodiment and further modifications are also shown in longitudinal section and serve to illustrate various sealing arrangements. Apart from these modifications, it can be assumed that the holder 1 shown has essentially the same construction, which is why only the differences are explained below. For example, it will be understood that, although the spring mechanism 15 is not shown in these figures for the sake of simplicity, the spring mechanism 15 according to Figure 11 Such a spring mechanism 15 is formed to be arranged or can be arranged accordingly therein.

[0079] like Figure 12As shown, as an alternative to the soft plastic layer 29 (not shown here), an O-ring 32 can be received in an outer circumferential groove as a seal on the outer cone of the retainer port 14, making the seal easier to maintain and, in particular, replaceable. In this case, preferably, a capsule 2 can be used in which the air chamber port 8 is provided with a straight cylindrical inner surface adjacent to the O-ring 32, which is easier to manufacture and also allows for higher axial position tolerances. In addition, if the retainer port 14 is attached to the compression member 30, i.e., arranged on the spring mechanism 15 as (part of) the ejection mechanism, then when the clamping device (in this example, a slip-fit ​​hook) is released, the spring mechanism 15 acts on the capsule 2 through the friction between the O-ring and the straight cylindrical inner surface of the air chamber port 8 to eject it. In the second or third embodiment, if the spring mechanism 15 is not provided, but only the guide link 18 / 22 is provided as the ejection mechanism, the outer cone can also be rigidly arranged in the shaft 16.

[0080] exist Figure 13 In the embodiment, a carrier sleeve 33 is inserted at the front at the inlet of the shaft 16 (facing the inserted pressure cartridge 2), wherein, instead of or in addition to the soft plastic layer 29 or the O-ring 32 arranged on the above-mentioned outer cone, an inner circumferential groove with an O-ring 34 inserted therein is provided as a seal. Figure 13 The O-ring 34 is shown in sealing contact with the right cylindrical outer surface of the air chamber port 8, thereby sealing the air chamber port 8 from the shaft 16. This is advantageous particularly when the shaft 16 itself forms part of the pressure transmission line between the capsule 2 and the pressure sensor and can be provided in both embodiments with and without the spring mechanism 15 as the ejection mechanism.

[0081] exist Figure 14 In, with Figure 13 In contrast, no carrier sleeve 33 is provided as a carrier for the O-ring 34, but the O-ring 35 is provided in the outer circumferential groove on the right cylindrical outer surface of the air chamber port 8 and in sealing contact with the right cylindrical inner circumferential surface of the shaft 16. This can be explained in accordance with the above. Figure 13 The modified embodiment with and without spring means 15 is realized and can in particular provide a shaft 16 for use as a pressure transmission line, but with the Figure 13 Modifications are easier to make and maintain.

[0082] Reference Mark List

[0083] 1 Pressure cell holder

[0084] 2 pressure boxes

[0085] 3 Subject

[0086] 4 membrane

[0087] 5 blood chamber

[0088] 6 Air chamber

[0089] 7 Blood Chamber Port

[0090] 8 Fluid / Air Chamber Ports

[0091] 9 Receiving chamber

[0092] 10 Wall / wall section

[0093] 11 Slit / Axial Slit

[0094] 12 Slide-in fitting hook / spring hook (clamping device)

[0095] 13 bottom

[0096] 14 (Retainer) Port Component

[0097] 15 Spring mechanism (pop-up mechanism)

[0098] 16 axes

[0099] 17 Extension / Clamp (Clamping Device)

[0100] 18 Slits / circumferential slits (guide link, ejection mechanism)

[0101] 19-port receptacle

[0102] 20 Indent

[0103] 21 Ring spindle / turn bolt (clamping device)

[0104] 22 L-shaped slit (guide link, ejection mechanism)

[0105] 23 Hinge beads / hinge (clamping device)

[0106] 24 Locking hook (clamping device)

[0107] 25 Locking tab (clamping device)

[0108] 26 longitudinal pillars

[0109] 27 Adjacency Ring

[0110] 28 Joint Edge

[0111] 29 soft plastic layer

[0112] 30 Compression member

[0113] 31 Spring

[0114] 32 O-ring (seal modification)

[0115] 33 Carrier sleeve

[0116] 34 O-ring (seal modification)

[0117] 35 O-ring (seal modification)

[0118] 36 Pressure transmission line

[0119] Port 37

Claims

1. A pressure cartridge holder (1) which is attached or can be attached to a housing of an extracorporeal blood treatment machine, the pressure cartridge holder (1) comprising: a clamping device (12; 17; 21; 23, 24, 25) adapted to clamp or engage around a pressure cartridge (2) which is inserted or can be inserted into the pressure cartridge holder (1) and whose inner space is divided by a membrane (4) into a blood chamber (5) and a fluid chamber (6); and a pressure transmission line (36) which is configured to be fluidically connected to the fluid chamber (6) of the pressure cartridge (2) and to transmit the fluid pressure present in the fluid chamber (6) to a pressure sensor of the extracorporeal blood treatment machine, It is characterized by The pressure box holder (1) and the pressure box (2) are connected through the air chamber port (8) and the holder port (14), The retainer port (14) is mounted on a compression member (30), and the retainer port (14) and the compression member (30) together form a pressure element, The compression member (30) extends through the shaft (16) of the pressure cartridge holder (1), The compression member (30) and the spring assembly (31) wound around the compression member (30) form a spring mechanism (15) as an ejection mechanism, wherein the ejection mechanism is adapted to actively eject the pressure box (2) when the clamping device (12; 17; 21; 23, 24, 25) is released, and The retainer port (14) containing the pressure transmission line (36) is arranged or formed at an outer end of the pressure element.

2. The pressure cell holder (1) according to claim 1, characterized in that The ejection mechanism comprises the spring mechanism (15) having the pressure element, which is spring-mounted in such a way that the pressure element is pre-tensioned when the pressure cartridge (2) is inserted and presses against the pressure cartridge (2) in a holding state in which the pressure cartridge (2) is held by the clamping device (12; 17; 21; 23, 24, 25).

3. The pressure cell holder (1) according to claim 2, characterized in that The clamping device (12; 17; 21; 23, 24, 25) is mounted on the housing via the shaft (16), wherein the pressure element is received in the shaft (16) and is spring-mounted.

4. The pressure cell holder (1) according to claim 1, characterized in that The tapered retainer port (14) is a Luer connector made of soft plastic.

5. The pressure cell holder (1) according to claim 1, characterized in that The spring force of the spring mechanism (15) is set to press the pressure element against the pressure cartridge (2) in a holding state in such a way that a gas-tight connection is provided between the pressure cartridge (2) and the pressure transmission line (36).

6. The pressure cell holder (1) according to claim 1, characterized in that At least one wall portion (10) is provided, at least partially defining a receiving chamber (9) for receiving the pressure cartridge (2).

7. The pressure cell holder (1) according to claim 6, characterized in that The at least one wall portion (10) is provided with a slit (11; 18) for receiving at least one blood chamber port (7) of the pressure cartridge (2).

8. The pressure cell holder (1) according to claim 6, characterized in that The inner circumferential surface of the at least one wall portion (10) is formed to serve as a guide for the pressure cartridge (2).

9. The pressure cell holder (1) according to claim 1, characterized in that The clamping device forms at least one slide-fit hook (12) designed to engage behind the pressure capsule (2) when inserted into the pressure capsule (2).

10. The pressure cell holder (1) according to claim 7, characterized in that The at least one slit is a circumferential slit (18) extending transversely to the insertion direction along the at least one wall portion (10), the clamping device being separated by the circumferential slit (18) or formed as at least one elastically bendable clamp (17), the clamp (17) extending parallel to the circumferential slit (18) at a front end of the wall portion (10) of the pressure cartridge holder (1), wherein the at least one blood chamber port (7) can be inserted into the circumferential slit (18) by rotating the pressure cartridge (2).

11. The pressure cell holder (1) according to claim 10, characterized in that The at least one circumferential slit (18) widens at one end to provide a latchable port receptacle (19).

12. The pressure cell holder (1) according to claim 11, characterized in that A setback (20) is provided at the front edge of the at least one wall portion (10) close to the attachment point of the clamp (17).

13. The pressure cell holder (1) according to claim 10, characterized in that The clamping device comprises a sleeve-shaped turning bolt (21) which is rotatably mounted on the outer side of the at least one wall portion (10) and has at least one L-shaped slot (22) having: an axial portion which is axially open on the front face of the rotating bolt (21) against the insertion direction and which, in the open position of the rotating bolt (21), overlaps with at least one axially extending slit (11) provided in the wall portion in such a manner that the at least one blood chamber port (7) can be inserted into the corresponding L-shaped slit (22) and the at least one axially extending slit (11); as well as A circumferential portion forming a circumferentially extending slit end and adapted to hold the at least one blood chamber port (7) in a fixed position together with the at least one axially extending slit (11) in a closed position achievable by rotating the rotating bolt (21).

14. The pressure cell holder (1) according to claim 10, characterized in that The eject mechanism has a guide link having a slit extending obliquely with respect to an insertion direction.

15. The pressure cell holder (1) according to claim 2, characterized in that The clamping device forms a locking tab (25) which is attached or releasably mounted via a hinge-like joint (23) in such a way that, in the closed position, the locking tab extends over the pressure cartridge (2) on the side opposite the spring mechanism (15) in order to press the pressure cartridge (2) against the spring mechanism (15).

16. The pressure cell holder (1) according to claim 13, characterized in that The ejection mechanism has a guide link having a slit extending obliquely to the circumferential slit (18) or the circumferential portion of the L-shaped slit (22).

17. The pressure cell holder (1) according to claim 7, characterized in that The slit (11; 18) is provided in the inner circumferential surface of the at least one wall portion (10).

Images