Medical device for carrying out extracorporeal blood treatment

Abstract

Medical device is known, which has a housing member, a cover and a pivot bearing arrangement, by means of which the cover is supported on the housing member and in a manner pivotable about a pivot axis relative to the housing member, wherein the cover is pivotable at least between a cover position, in which the cover covers the housing member, and a release position, in which the cover releases the housing member, and wherein the pivot bearing arrangement has at least two pivot bearings arranged spaced apart from one another along the pivot axis. According to the invention, the pivot bearings each have a bearing element and a bearing element receptacle, wherein the bearing element is embedded in the respective bearing element receptacle and is pivotable about the pivot axis relative to the bearing element receptacle and is linearly movable along the pivot axis limitedly, whereby the cover is displaceable between a removal position and a support position in a manner linearly movable along the pivot axis relative to the housing member, wherein in the removal position at least one of the bearing elements is out of engagement with the respective bearing element receptacle and in the support position both bearing elements are in engagement with the respective bearing element receptacle, and wherein a spring device is provided, by means of which the cover is elastically supported along the pivot axis and is elastically preloaded relative to the housing member in the direction of the support position. Use in extracorporeal blood treatment.

Description

TECHNICAL FIELD

[0001] The invention relates to a medical device for carrying out extracorporeal blood treatment, having a housing member, a cover and a pivot bearing arrangement by means of which the cover is supported on the housing member and in a manner pivotable about a pivot axis relative to the housing member, wherein the cover is pivotable at least between a cover position in which the cover covers the housing member and a release position in which the cover releases the housing member, and wherein the pivot bearing arrangement has at least two pivot bearings arranged spaced apart from one another along the pivot axis. BACKGROUND

[0002] Such a medical device in the form of a dialysis device for carrying out extracorporeal blood treatment is known from EP 2 679 752 A1. The dialysis device has a peristaltic pump having a pump housing and a pump cover. The pump cover is supported on the pump housing by means of a pivot bearing arrangement in a manner pivotable about a pivot axis relative to the pump housing between a cover position and a release position. In the cover position the pump housing is covered by means of the pump cover. In the release position the pump cover releases the pump housing. The pivot bearing arrangement of the known dialysis device has two pivot bearings arranged spaced apart from one another along the pivot axis, which are referred to as pivot joints and each have a first and a second joint section. The second joint sections are each fixed on the pump housing and for this purpose are introduced into a blind hole extending perpendicular to the pivot axis. In order to fix the pump cover on the pivot joints, a hinge pin is provided which passes through a hinge hole extending through the pump cover parallel to the pivot axis and is fixed at one end in a shape-locking manner on a section of the pump cover provided for this purpose. SUMMARY

[0003] It is the task of the invention to provide a medical device of the type mentioned at the outset which has a simplified construction compared to the prior art and which in particular enables simplified removal and installation of the cover on the housing member.

[0004] The task is solved by the fact that the pivot bearing has a bearing element and a bearing element receptacle, wherein the bearing element is inserted into the respective bearing element receptacle and can be pivoted about a pivot axis relative to the bearing element receptacle and can be linearly moved along the pivot axis in a limited manner, whereby the cover can be linearly moved along the pivot axis relative to the housing member between a detached position and a bearing position, wherein in the detached position at least one of the bearing elements is out of engagement with the respective bearing element receptacle and in the bearing position both bearing elements are in engagement with the respective bearing element receptacle, and wherein a spring device is provided by means of which the cover is elastically supported along the pivot axis and elastically preloaded relative to the housing member in the direction of the bearing position. By the solution according to the invention a simplified construction of the medical device is achieved. In particular a significantly simplified detachment and mounting of the cover relative to the prior art can be achieved. Since by the limited linear movability of the bearing elements in the bearing element receptacles the cover can be moved not only about the pivot axis but also axially along the pivot axis in a limited manner. Thereby the bearing elements can be out of engagement with the respective bearing element receptacle for the purpose of detaching the cover. This is simply done by a simple lateral linear movement of the cover relative to the pump housing. In order to prevent the bearing elements from undesired out of engagement with the respective bearing element receptacle for example in a pivoting movement of the cover the spring device is provided. The spring device tension the cover relative to the pump housing with an elastic spring force in the direction of the bearing position. Thereby the bearing elements are reliably kept in engagement with the respective bearing element receptacle. The cover is elastically supported on the housing member along the pivot axis, that is to say axially by means of the spring device. The pivot bearing device is in operative connection with the cover and the housing member. In one design variant the bearing elements are arranged on the cover and can be moved with the cover relative to the housing member. In this case the bearing element receptacles are arranged on the housing member. Alternatively the bearing elements can be arranged on the housing member. In this case the bearing element receptacles are arranged on the cover and can be moved with the cover. Furthermore alternatively one of the bearing elements can be arranged on the cover and the other one of the bearing elements can be arranged on the housing member. In this case the bearing element receptacles are correspondingly arranged on the housing member and on the cover. In one design variant the bearing elements are integrally constructed on the cover and / or the housing member and thereby form an integral functional section of the respective member. Alternatively the bearing elements are made as separate members and are joined with the cover and / or the housing member.Furthermore, as an alternative, one of the bearing elements is integrally configured on the cover and / or the housing member and the other one of the bearing elements is produced as a separate component. This also applies in terms of meaning to the integral and / or separate configuration of the bearing element receptacle. The bearing elements are preferably designed as bearing journals, bearing bolts and / or bearing pins, respectively. The bearing element receptacle is preferably designed complementary thereto as a borehole in the form of a journal receptacle, a bolt receptacle and / or a pin receptacle, respectively. The bearing elements and the bearing element receptacle preferably interact in a slidable manner. In order to carry out the mentioned axially resilient bearing and pre-tensioning of the cover by means of a spring device, the spring device has, in one design variant, a spring element which acts between the cover and the housing member. As an alternative, the axially resilient bearing and pre-tensioning can be caused by an at least partially spring-elastic design of at least one of the cover, the housing member, at least one of the bearing elements and / or at least one of the bearing element receptacles. Here, the spring-elastic design can be realized, inter alia, by a soft-elastic material property and / or by an elastically flexible shaping of the respective component. The housing member is preferably a pump housing of a peristaltic pump of a medical device. In this case, the cover can also be referred to as a pump cover.

[0005] In the design of this invention, the spring device has at least one spring element that acts at one end on one of the support elements and at least indirectly supports the cover or housing member at the other end. Alternatively, the spring device is formed by a flexible wall section of the cover, on which one of the support elements or one of the support element receiving portions is constructed. The spring element elastically prevents linear movement of the cover along the pivot axis toward the disassembly position. In other words, the spring element tensions or compresses the cover relative to the housing member toward the support position. For this purpose, the spring element acts at one end on the support element and at the other end on the cover or housing member. As long as the support element is arranged on the cover, the spring element acts on the cover at the other end. As long as the support element is arranged on the housing member, the spring element also acts on the housing member at the other end. Alternatively, the spring device is formed by the aforementioned flexible wall section of the cover. When the cover moves from the support position to the disassembly position, the wall section elastically deforms. The elastic force generated by the elastic deformation prevents the cover from moving toward the disassembly position. The elastic shape flexibility of the wall segment can be achieved through appropriate material selection and / or design. For example, the wall segment can be relatively thin-walled. Alternatively or supplementarily, the wall segment can be made of a material that is relatively flexible relative to the rest of the medical device and / or other segments. The corresponding support element or the corresponding support element receiving portion is preferably integrally constructed on the shape-flexible wall segment.

[0006] In another embodiment of the invention, a support device is provided that operatively connects to the cover and housing members. By means of this support device, the cover is form-locked to the housing members against linear movement toward a disassembly position, wherein the support is initiated at least in the covered position, and wherein the support is cancelled in a defined pivot position of the cover for disassembly. The support device prevents undesirable disassembly of the cover in the covered position and / or when deflected about a pivot axis. To this end, the support device induces, at least in the covered position, a form-locking action along the pivot axis between the cover and the housing members, and thereby axially. This axial form-locking action in the covered position prevents axial linear movement of the cover toward the disassembly position. In contrast, the axial form-locking action is cancelled in the defined pivot position. Thus, the cover can be axially displaced along the pivot axis and against the elastic force of a spring mechanism into the disassembly position. The support device is preferably formed by a functional section integrally constructed on the cover and / or housing members. As an alternative or supplementary solution, the support device can have separate components capable of engaging with the cover and / or shell components. The support is created between axially opposed components and / or sections of the cover and shell components.

[0007] In another embodiment of the invention, the support device has at least one support element disposed on the cover, the support element being shape-locked to a support section of the housing member along a pivot axis, at least in the covered position, and the support element pivoting away from the support section about the pivot axis in a defined pivot position of the cover and thus no longer being supported on the support section. This allows for a particularly simple structural construction of the support device. The support element is preferably integrally constructed on the cover. The support is preferably canceled only in the defined pivot position.

[0008] In another embodiment of the invention, the defined pivoting position is either the release position of the cover or a pivoting position in which the cover continues to deflect about the pivot axis from the release position. This first variation allows the cover to be removed in the release position. In contrast, in the second variation, removal of the cover is not possible, for example, in the release position, but is possible in the pivoting position where the cover continues to deflect. This prevents accidental removal of the cover in the release position. Improved safety in use is thus achieved.

[0009] In another embodiment of the invention, the support device has at least one mating support element arranged on the cover, the mating support element being form-locked to a mating support section of the housing member at least in the covered position along the pivot axis and opposite to the support element. This provides improved, i.e., lateral support of the cover, particularly in the covered position. In another embodiment of the invention, the mating support element is also supported on the mating support section in the released position of the cover and / or in the pivoted position of continued deflection of the cover. This provides, in particular, improved lateral guidance for the cover when deflecting about the pivot axis. The mating support element is preferably integrally constructed on the cover.

[0010] In another embodiment of the invention, a retaining device is provided that is operatively connected to the cover and housing members, by means of which the cover is held in the released position against pivoting movement toward the covered position. Therefore, the retaining device prevents the cover from undesirably deflecting back from the released position to the covered position, for example, under the influence of gravity. The retaining device is preferably formed by a functional section integrally constructed on the cover and / or housing members. Alternatively or supplementary, the retaining device can have a separately manufactured component that engages with the cover or housing member. The retaining device preferably functions in a form-locking manner in the released position. Alternatively or supplementary, the retaining device can particularly function magnetically.

[0011] In another design of the application, the retaining device has a latching element arranged on the housing component, which can be snapped over by means of a pivoting movement of the cover by a latching section of the cover, wherein the latching section in the covered position releasably form-fittingly catches the latching element from behind. This allows a structurally particularly simple and robust construction of the retaining device. In snapping over the latching element, the latching section and the latching element perform an axial and thus a relative movement along the pivot axis. This is an additional relative movement generated by the pivoting movement. In another design of the application, the latching element and the latching section are supported with respect to one another along the pivot axis by means of a spring device. Thereby, the function of the retaining device is supported in a particularly advantageous manner by means of the spring device. Here, the retaining device interacts with the spring device. Since the latter presses the cover laterally in the direction of the support position. Thereby, the latching element and the latching section are indirectly supported axially with respect to one another by the spring device. This allows an easy snapping over in particular in the pivoting movement. Furthermore, the spring device supports the form closure between the latching section and the latching element.

[0012] In another design of the application, the cover has two side walls arranged spaced apart from one another along the pivot axis, which are bent with respect to the cover upper side, wherein the pivot bearing and / or the spring device and / or the support device and / or the retaining device are at least partially integrally constructed on at least one of the side walls. This design of the application allows a particularly advantageous reduction of the necessary number of components. A particularly simple construction is thereby achieved. Furthermore, the integral construction concept supports the disassembly and assembly, since the respectively integrally constructed components and / or sections are arranged almost loss-free on the at least one side wall and thereby on the cover. The side walls are axially opposite one another with respect to the pivot axis. In the covered position, the side walls snap over the housing component in the lateral direction. In combination with this design of the application, the manufacture of the cover as a plastic injection-molded component is particularly advantageous. BRIEF DESCRIPTION OF DRAWINGS

[0013] Further advantages and features of the application result from the claims and from the following description of preferred embodiments of the application, which are illustrated by means of the attached drawings.

[0014] Figure 1 A diagrammatic and greatly simplified illustration of a sectional portion of a design of a medical device for carrying out an extracorporeal blood treatment according to the application is shown, which has a housing component and a cover which is not shown in the drawing,

[0015] Figure 2A device known from the prior art is shown in a schematic perspective view, comprising a housing member, a cover and a pivoting bearing arrangement for deflecting the cover on the housing member,

[0016] Figure 3 A perspective view from above onto the device according to Figure 1 is shown in a view from above onto the device according to Figure 1 is shown in a view from above onto the device according to

[0017] Figure 4 A front view, partially sectioned with respect to the drawing plane according to Figure 1 is shown in a view from above onto the device according to Figure 3 is shown in a view from above onto the device according to Figure 5 is shown in a view from above onto the device according to

[0018] Figure 5 The housing member and the cover are shown in a view corresponding to Figure 4 is shown in a view from above onto the device according to

[0019] Figure 6 The housing member and the cover are shown in a partially sectioned perspective view, wherein the sectioning plane runs through the pivoting axis, and

[0020] Figure 7 The housing member and the cover are shown in a sectioned perspective view, wherein the cover occupies the release position and is shown in a partially transparent manner. DETAILED DESCRIPTION

[0021] A medical device V for carrying out extracorporeal blood treatment is shown in part and is designed in the form of a dialysis device according to Figure 1 Figure 1 ​The entire extracorporeal blood circuit of the medical device V is shown essentially. The extracorporeal blood circuit has an arterial blood line 1, by means of which blood to be treated is conducted from a not shown patient to a peristaltic pump 2 of the medical device V. An arterial pressure sensor 3 is arranged before the peristaltic pump 2 with respect to the direction of blood transport. By means of the arterial pressure sensor 3, the pressure in the arterial blood line 1 can be detected before the peristaltic pump 2. This pressure can also be referred to as the pressure on the low-pressure side. Along the direction of blood transport behind the peristaltic pump 2 and thus on the high-pressure side, a high-pressure blood line 4 leads to an arterial air trap 5. At the outlet of the peristaltic pump 2, an input line 6 is arranged here, which is connected to a pump 7. Through the input line 6, an additive, for example heparin for blood thinning, can be added. From the arterial air trap 5, a line 8 conducts the blood to be treated to a dialyzer 9, to which dialysate is delivered via a dialysate input line 10 on the inlet side. In the dialyzer 9, the blood is treated in a known manner by means of dialysate. The used dialysate, which can also be referred to as the dialysate, is discharged from the dialyzer 9 via a dialysate discharge line 11 and is delivered to a not shown cleaning or disposal mechanism. The blood to be treated is conducted from the dialyzer 9 to a venous air trap 13 by means of a blood discharge line 12 in order to separate air. Behind the venous air trap, an air probe / bubble probe 14 is connected, which recognizes whether there is air in the system which is dangerous for the patient. A venous pressure sensor 15 is arranged at the venous air trap 13, by means of which the venous pressure can be detected. The treated blood is conducted back to the patient from the air trap 13 via the air probe / bubble probe 14 via a venous blood line 16. Furthermore, a control and monitoring mechanism 17 for controlling and monitoring the medical device V is provided. The medical device V is enclosed in a housing G with a housing front 100, in particular the peristaltic pump 2 is mounted on the housing front.

[0022] The peristaltic pump 2 has a rotor 18 and a pump housing 20. The pump housing 20 forms a housing component of the medical device V. In the ready state of the medical device V, the pump housing 20 is covered by a cover which is supported in a pivotable manner on the pump housing 20 by means of a pivot bearing device which is also described in more detail. Not only the cover but also the pivot bearing device is not shown in Figure 1 for illustrative reasons.

[0023] In order to illustrate the basic structure and mode of action of the peristaltic pump 2, reference is first made to Figure 2 . Figure 2A peristaltic pump is shown which is known from the prior art and has a pump housing 200, a cover 240 and a pivot bearing arrangement 250. The pump housing 200 comprises a receiving recess 210, which can also be referred to as a pump bed. In the receiving recess 210 there is received a rotor which is not shown and which is rotatable in the driven state. The receiving recess 210 is bounded on the sides by support surfaces 230 which extend in an arc around the rotor axis 190 and are spaced apart from the rotor in the radial direction. Figure 2

[0024] The cover 240 is hinged on the pump housing 200 in a pivotally movable manner about a pivot axis SO by means of the pivot bearing arrangement 250. The cover 240 occupies an open state in which the receiving recess 210 is released upwards with respect to the drawing plane of Figure 2 Figure 2 This state can also be referred to as a released position. In the closed state, the cover 240 covers the receiving recess 210 upwards. This state can also be referred to as a covering position.

[0025] The principle mode of action of the peristaltic pump 2 for pumping blood between a low-pressure side and a high-pressure side is the same as the mode of action of the peristaltic pump shown according to the prior art by means of Figure 2 For this purpose, an elastically deformable hose line 22 is arranged in the radial direction between the rotor 18 and the support surface 23 (see Figure 4 ) of the pump housing 20. The hose line 22 is fluidically connected on its opposite ends in a manner known to the person skilled in the art to the arterial blood line 1 and to the high-pressure blood line 4. For pumping blood, the rotating rotor 18 acts on the hose line 22 such that this is locally elastically pressed between the rotor 18 and the support surface 23. The resulting pressing of the hose line 22, which can also be referred to as an occlusion, moves around the rotor axis 19 together with the rotating rotor 18, whereby blood is transported from the low-pressure side onto the high-pressure side.

[0026] For the peristaltic pump according to the prior art shown in Figure 2 , the cover 240 can be relatively troublesome to remove and install as a result of the structure of the pivot bearing arrangement provided there. By means of the design according to the application, which is shown in detail, Figures 3 to 7 this disadvantage is overcome in particular.

[0027] It is shown there that the cover 24 is supported on the pump housing 20 by means of the pivot bearing arrangement 25, 25a and in a pivotally movable manner about a pivot axis S with respect to the pump housing 20. In Figure 3 ​​In this position, the cover 24 occupies a covered position. In this covered position, the receiving opening 21 of the pump housing 20 is covered by the cover 24. From the covered position, the cover 24 can deflect relative to the pump housing 20 about the pivot axis S towards the release position. Figure 5 , 6 In position 7, the cover 24 occupies the released position. In the released position, the receiving recess 21 is positioned relative to... Figure 3 The drawing is released with the plane facing upwards. Using... Figure 1 In the ready-to-go state shown, the pump housing 20 and cover 24 are mounted on the front 100 of the housing such that the pivot axis S extends horizontally in the region of the upper edge of the pump housing 20 (not shown in detail).

[0028] In the illustrated embodiment, the pivot bearing assemblies 25, 25a have two pivot bearings arranged spaced apart from each other along the pivot axis S. The pivot bearings of the pivot bearing assemblies 25, 25a are also referred to below as the first pivot bearing 25 and the second pivot bearing 25a.

[0029] The pivot bearings 25 and 25a each have support elements 26 and 26a and support element receiving portions 27 and 27a, respectively. The support elements 26 and 26a are respectively embedded in their respective support element receiving portions 27 and 27a along the axial direction and are capable of pivoting relative to them about the pivot axis S. The support elements 26 and 26a are hereinafter also referred to as the first support element 26 and the second support element 26a. This also applies to the support element receiving portions 27 and 27a, which are also referred to as the first support element receiving portion 27 and the second support element receiving portion 27a.

[0030] Especially with the help of Figure 6 It can be seen that the support elements 26, 26a and the support element receiving portions 27, 27a not only support each other in a manner that allows them to pivot relative to each other about the pivot axis S, but more precisely, they simultaneously ensure limited linear mobility of the support elements 26, 26a and their respective support element receiving portions 27, 27a in the axial direction along the pivot axis S.

[0031] Therefore, in the illustrated embodiment, the second support element 26a is designed as a support pin P and is received in the receiving hole 28 of the pump housing 20 in a manner that allows for limited axial movement. Due to this movable reception of the support pin P, the cover can move laterally relative to the pump housing 20, that is, axially along the pivot axis S. The cover 24, by means of… Figures 3 to 7The visible axial position relative to the pump housing 20 can also be referred to as the support position. In this support position, the two support elements 26, 26a are engaged with the respective support element receptacle 27, 27a. From the support position, the cover 24 can be pressed laterally about the pivot axis S in the direction of the removal position until the first support element 26 is disengaged from the first support element receptacle 27. The cover 24 is then in the removal position. This removal position allows the cover 24 to be easily removed manually from the pump housing 20. This applies correspondingly to the installation of the cover 24. Figure 4 、 5 , the drawing plane of Figure 6 is pressed to the left until the first support element receptacle 27 is disengaged from the first support element 26. The cover 24 is then in the removal position. This removal position allows the cover 24 to be easily removed manually from the pump housing 20. This applies correspondingly to the installation of the cover 24.

[0032] In order to prevent the undesired removal of the cover 24, a spring device 29 is furthermore provided, by means of which the cover 24 is spring-loaded along the pivot axis S and elastically pre-tensioned relative to the pump housing 20 in the direction of the support position.

[0033] The spring device 29 is configured as a spring element F in the embodiment shown. The spring element F is integrated into the support pin P, so that this support pin P can also be referred to as a spring pin P. The spring element F is indirectly supported at one end on the pump housing 20 in any case and acts at the other end on the not-detailedly-illustrated back side of a head section 30a of the support pin P. The head section 30a is engaged into the second support element receptacle 27a.

[0034] In an alternative design of the spring device, which is not shown in the figures, the support pin P is arranged in an axially immovable manner on the pump housing 20, and the elastic support and pre-tensioning in the axial direction is achieved by means of an elastically shape-flexible design of the cover 24 in the region of the wall section W. By means of the shape-flexible design of the wall section W, the cover can be pressed laterally in the direction of the removal position despite the axially fixed arrangement of the support pin P.

[0035] In the embodiment shown, the first support element 26 is designed as a support journal. Correspondingly, the first support element receptacle 27a is configured as a support journal receptacle.

[0036] Furthermore, the support element 26, 26a can be arranged in the pump housing 20 in particular by means of a corresponding recess. Figure 6 It can be seen that the support element receptacles 27, 27a are respectively integrally configured on the cover 24. The support elements 26, 26a are correspondingly arranged on the pump housing 20, wherein the first support element 26 is integrally configured on the pump housing 20. In contrast, the second support element 26a or support pin P is manufactured as a separate component and is joined together with the pump housing 20 by means of insertion into the receptacle hole 28.

[0037] To prevent the cover 24 from being removed from the pump housing 20 by accident, a support device T is provided in the embodiment shown which is configured between the cover 24 and the housing member 20. Figure 7 By means of the support device T, the cover 24 can be positively locked against linear movement into the removal position on the pump housing 20. Here, this positive locking is effected at least in the cover position. In contrast, the positive locking is cancelled in a defined pivoting position Figure 7 so that the cover 24 can be moved from the bearing position into the removal position as a result of the lack of positive lateral support on the pump housing 20.

[0038] In the embodiment shown, the defined pivoting position of the cover 24 is the release position. In an embodiment not shown, the defined pivoting position for removing the cover 24 is a pivoting position of the cover 24 which continues to be deflected about the pivot axis S from the release position.

[0039] The support device here has a support element 31 which is arranged on the cover 24 and positively cooperates with a support section 32 arranged on the pump housing 20 for the support. The support section 32 is formed by the outer surface of the side of the pump housing 20. The support element 31 is integrally formed on the cover 24 here and opposes the support section 32 in the axial direction of the pivot axis S. This is the case at least in the cover position. In the release position shown, the support element 31 is pivoted away from the support section 32 about the pivot axis S together with the cover 24 and thus cannot be axially supported on the support section. In other words, the support element 31 positively locks the axial movability of the cover 24 at least in the cover position such that the cover 24 cannot be moved from the bearing position into the removal position. Even in the pivoting movement of the cover 24 from the cover position, the support element 31 remains positioned axially relative to the support section 32 such that the axial movability of the cover is also positively locked. Only in the defined pivoting position of the cover 24, here in the release position, is the support element 31 no longer positioned relative to the support section 32 such that the axial movability of the cover in the direction of the removal position is released. Figure 7

[0040] In the embodiment shown, the support device T furthermore has a further support element 33. The support element 33 ensures an as far as possible planar support on the support section 32, in particular in the cover position.

[0041] Furthermore, the support device T here has a counter support element 34 which is arranged on the cover Figure 6 , 7 ​), which in any case supports the pump housing 20 in the axial direction and opposite the support element 32 in the covered position. To this end, the pump housing 20 has a counter support section 35. The counter support section 35 is formed by the side of the pump housing 20 in a manner corresponding to the support section 32. The counter support element 34 and the counter support section 35 face each other in the axial direction of the pivot axis S and prevent an axial movement of the cover 24 with respect to the pump housing 20 from left to right in the plane of the drawing. Figure 6 In this way, in particular, an undesired disengagement of the bearing pin P from the second bearing element receptacle 27a is prevented. In the embodiment shown, the counter support element 34 is positioned relative to the counter support section 35 in the axial direction over the entire pivot range of the cover 24. In other words, the cover 24 can be supported on the counter support section 35 by means of the counter support element 34 not only in the covered position but also in all other pivot positions.

[0042] With reference to Figure 1 , the cover 24 projects obliquely forward upward from the pump housing 20 in the release position. In order to hold the cover 24 in the release position against the action of gravity, a holding device H is provided here. The holding device H holds the cover in the release position against a pivot movement pointing toward the covered position. The holding device H is constructed between the cover 24 and the pump housing 20. Here, the holding device H has a latching element 36 arranged on the pump housing 20 and a latching section 37 constructed on the cover 24. The latching element 36 projects laterally from the pump housing 20 in the axial direction of the pivot axis S and is arranged here in the region of the counter support section 35. The latching element 36 is provided on an externally located end region with a rounded latching contour 38. The latching section 37 is integrally constructed on the cover 24 and has a chamfered latching contour 39 ( Figure 4 ) here. By means of a pivot movement of the cover 24, the latching element 36 can be snapped by the latching section 37. Here, first the chamfered latching contour 39 slides against the rounded latching contour 38 of the latching element 36. This is shown in Figure 4 . Here, the latching section 37 is pressed outward in the axial direction relative to the latching element 36. After snapping in the latching element, the latching section 37 catches the rounded latching contour 38 from behind, so that the cover 24 is held form-fittingly in the release position.

[0043] The holding device H interacts in an advantageous manner with the spring device 29 when the snap-in catch element 36 is snapped in. Since the previously described axial displacement movement of the catch section 37 and thus of the entire cover 24 is supported by the elastic bearing of the bearing pin P. Thereby, the snapping in described previously takes place particularly easily and with low wear. At the same time, the elastic bearing or pre-tensioning support by means of the spring device 29 reliably catches the catch element 36 from behind.

[0044] Furthermore, the cover 24 has two side walls 40, 40a arranged spaced apart from one another along the pivot axis S, which can also be referred to as a first side wall 40 and a second side wall 40a. The side walls 40, 40a are bent with respect to a cover upper side 41 of the cover 24, wherein an angle of approximately 90° is provided here. The side walls 40, 40a laterally overlap the pump housing 20 in the cover position. Here, the side walls 40, 40a are arranged in axial opposition to the counter bearing section 35 or the bearing section 32 of the pump housing 20.

[0045] The bearing element receptacle 27, 27a is configured in the region of the side wall 40, 40a here. More precisely, the first bearing element receptacle 27 is configured on the first side wall 40. Here, the bearing element receptacle 27 currently extends in the form of a straight-through hole through the first side wall 40. The second bearing element receptacle 27a is configured in the region of the second side wall 40a.

[0046] Furthermore, the support device T is also at least partially configured in the region of the side walls 40, 40a here Figure 7 The support element 31 and the further support element 33 are configured on an inner side of the second side wall 40a. The counter support element 34 is configured on an inner side of the first side wall 40, which is in opposition to the inner side of the second side wall 40a.

[0047] Furthermore, the holding device H is also at least partially configured in the region of the side walls 40, 40a. More precisely, the catch section 37 is configured on an inner side of the first side wall 40.

[0048] The previously described preferred integral configuration of the respective functional sections of the pivot bearing device 25, 25a, the support device T and the holding device H on the side walls 40, 40a, in particular on their inner sides, is particularly advantageous. The cover 24 is made as a plastic injection-molded component in the illustrated embodiment.

Claims

1. A medical device (V) for performing extracorporeal blood processing, including - The housing member (20), the cover (24), and the pivot bearing device (25, 25a) are supported by means of the pivot bearing device, wherein the cover (24) is supported on the housing member (20) and in a manner that allows it to pivot about the pivot axis (S) relative to the housing member (20). - wherein the cover (24) is pivotable at least between the covered position where the cover (24) covers the housing member (20) and the released position where the cover (24) releases the housing member (20), -and the pivot bearing assembly (25, 25a) therein has at least two pivot bearings (25, 25a) arranged spaced apart from each other along the pivot axis (S). -It is characterized by, The pivot bearings (25, 25a) each have a support element (26, 26a) and a support element receiving portion (27, 27a). -The support elements (26, 26a) are embedded in their respective support element receiving portions (27, 27a) and are pivotable about a pivot axis (S) relative to the support element receiving portions and are capable of limited linear movement along the pivot axis (S). -Thus, the cover (24) can be displaced between a disassembled position and a supported position in a manner that allows linear movement relative to the housing member (20) along the pivot axis (S), wherein in the disassembled position at least one of the support elements (26, 26a) is disengaged from its respective support element receiving portion (27, 27a), and in the supported position both support elements (26, 26a) are engaged with their respective support element receiving portions (27, 27a). - And a spring device (29) is provided therein, by means of which the cover (24) is elastically supported along the pivot axis (S) and elastically pre-tightened relative to the housing member (20) in the direction of the supported position.

2. The medical device (V) according to claim 1, characterized in that, The spring device (29) has at least one spring element (F) that acts at one end on one of the support elements (26, 26a) and is at least indirectly supported at the other end on the cover (24) or the housing member (20), or the spring device is formed by a flexible wall section (W) of the cover (24) in which one of the support elements (26, 26a) or one of the support element receiving portions (27, 27a) is constructed.

3. The medical device (V) according to claim 1 or 2, characterized in that, A support device (T) is provided that is operatively connected to the cover (24) and the housing member (20), the cover (24) being able to be supported on the housing member (20) in a form-locking manner against linear motion toward a disassembly position by means of the support device, wherein the support is caused at least in the covered position, and wherein the support is removed for disassembly of the cover in a defined pivot position of the cover (24).

4. The medical device (V) according to claim 3, characterized in that, The support device (T) has at least one support element (31) arranged on the cover (24), the support element being shaped-locked on the support section (32) of the housing member (20) at least in the covered position along the pivot axis (S), and the support element pivoting away from the support section (32) about the pivot axis (S) in the defined pivot position of the cover (24) and thus not being able to be supported on the support section.

5. The medical device (V) according to claim 3, characterized in that, The defined pivot position is either the release position of the cover (24) or a pivot position from which the cover continues to deflect around the pivot axis (S).

6. The medical device (V) according to claim 3, characterized in that, The support device (T) has at least one mating support element (34) arranged on the cover (24), the mating support element being supported at least in the covered position along the pivot axis (S) and in a form-locking manner relative to the support element (31) on the mating support section (35) of the housing member (20).

7. The medical device (V) according to claim 3, characterized in that, A retaining device (H) is provided that is operatively connected to the cover (24) and the housing member (20), wherein the cover (24) is held in the released position by means of the retaining device to overcome pivoting movement toward the covered position.

8. The medical device (V) according to claim 7, characterized in that, The retaining device (H) has a locking element (36) arranged on the housing member (20), the locking element being latched by a locking section (37) of the cover (24) by means of the pivoting movement of the cover (24), wherein the locking section (37) can be loosely and form-lockedly engaged from behind the locking element (36) in the covered position.

9. The medical device (V) according to claim 8, characterized in that, The locking element (36) and the locking section (37) are elastically supported relative to each other along the pivot axis (S) by means of the spring device (29).

10. The medical device (V) according to claim 7, characterized in that, The cover (24) has two sidewalls (40, 40a) arranged spaced apart from each other along a pivot axis (S), the sidewalls being bent relative to the upper side (41) of the cover, wherein the pivot bearing (25, 25a) and / or the spring device (29) and / or the support device (T) and / or the retaining device (H) are at least partially integrally formed on at least one of the sidewalls (40, 40a).

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