MEDICAL DEVICE FOR EXTRACORPOREAL BLOOD TREATMENT

Description

[0001] The invention relates to a medical device for extracorporeal blood treatment, comprising a peristaltic pump with a pump housing, a cover and a pivot bearing arrangement, by means of which the cover is mounted on the pump housing and pivotably movable about a pivot axis relative to the pump housing, wherein the cover is pivotably movable at least between a covering position in which the cover covers the pump housing and a release position in which the cover releases the pump housing, and wherein the pivot bearing arrangement has at least two pivot bearings arranged at a distance from one another along the pivot axis.

[0002] Such a medical device is known from EP 2 679 752 A1 in the form of a dialysis machine for extracorporeal blood treatment. The dialysis machine has a peristaltic pump with a pump housing and a pump cover. The pump cover is mounted on the pump housing by means of a pivot bearing arrangement and can pivot about a pivot axis relative to the pump housing between a covering position and a release position. In the covering position, the pump housing is covered by the pump cover. In the release position, the pump cover releases the pump housing. The pivot bearing arrangement of the known dialysis machine has two pivot bearings arranged at a distance 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 fastened to the pump housing and, for this purpose, are inserted into blind bores extending perpendicular to the pivot axis.To fasten the pump cover to the swivel joints, a hinge pin is provided which is inserted through a hinge hole extending parallel to the swivel axis through the pump cover and is positively fastened at one end to a section of the pump cover provided for this purpose.

[0003] The object of the invention is to provide a medical device of the type mentioned at the outset which has a simplified structure compared to the prior art and in particular enables simplified disassembly and assembly of the cover on the housing component.

[0004] This object is achieved in that the pivot bearings each have a bearing element and a bearing element receptacle, wherein the bearing elements engage in the respective bearing element receptacle and are pivotally movable relative to the same about the pivot axis and linearly movable to a limited extent along the pivot axis, whereby the cover is linearly movable along the pivot axis relative to the housing component between a disassembly position in which at least one of the bearing elements is disengaged from the respective bearing element receptacle and a storage position in which both bearing elements are engaged with the respective bearing element receptacle, and wherein a spring arrangement is provided by means of which the cover is resiliently mounted along the pivot axis and elastically prestressed in the direction of the storage position relative to the housing component. The solution according to the invention achieves a simplified design of the medical device.In particular, this enables significantly easier disassembly and assembly of the cover compared to the prior art. This is because the limited linear movement of the bearing elements in the bearing element receptacles means that the cover is not only movable around the pivot axis, but also to a limited extent axially along it. This allows the bearing elements to be disengaged from the respective bearing element receptacle in order to disassemble the cover. In simple terms, this is achieved by a simple lateral linear movement of the cover relative to the pump housing. The spring arrangement is provided to prevent the bearing elements from accidentally becoming disengaged from the respective bearing element receptacle, for example during a pivoting movement of the cover. This elastically spring-loaded tensions the cover relative to the pump housing in the direction of the bearing position. This holds the bearing elements securely in engagement with the respective bearing element receptacle.The cover is resiliently mounted on the housing component along the pivot axis, i.e. axially, by means of the spring arrangement. The pivot bearing arrangement is operatively connected to the cover and to the housing component. In one embodiment, the bearing elements are each arranged on the cover and are movable together with the cover relative to the housing component. In this case, the bearing element receptacles are arranged on the housing component. Alternatively, the bearing elements can be arranged on the housing component. In this case, the bearing element receptacles are arranged on the cover and are movable together with the cover. Further alternatively, one of the bearing elements can be arranged on the cover and another of the bearing elements on the housing component. In this case, one of the bearing element receptacles is arranged on the housing component and another of the bearing element receptacles is arranged on the cover.In one embodiment, the bearing elements are formed integrally on the cover and / or on the housing component and thus form a one-piece functional section of the corresponding component. Alternatively, the bearing elements are manufactured as separate components and joined to the cover and / or the housing component. Further alternatively, one of the bearing elements is formed integrally on the cover and / or on the housing component and another of the bearing elements is manufactured as a separate component. The same applies mutatis mutandis with regard to a one-piece and / or separate design of the bearing element receptacles. The bearing elements are preferably each designed as a bearing journal, bolt and / or pin. The bearing element receptacles are preferably designed complementarily thereto as a bore in the form of a journal, bolt and / or pin receptacle. The bearing elements and the bearing element receptacles preferably interact in a sliding manner.For the said axially resilient mounting and preloading of the cover by means of the spring arrangement, in one embodiment the latter comprises a spring element acting between the cover and the housing component. Alternatively, the axially resilient mounting and preloading can be achieved by an at least partially resilient design of the cover, the housing component, at least one of the bearing elements and / or at least one of the bearing element receptacles. The resilient design can be achieved in particular by soft-elastic material properties and / or by an elastically yielding shape of the corresponding component. According to the invention, the housing component is a pump housing of a peristaltic pump of the medical device. In this case, the cover can also be referred to as a pump cover.

[0005] In an embodiment of the invention, the spring arrangement has at least one spring element, which engages one of the bearing elements at one end and is at least indirectly supported on the cover or the housing component at the other end, or the spring arrangement is formed by an elastically flexible wall section of the cover, on which wall section one of the bearing elements or one of the bearing element receptacles is formed. The spring element resiliently counteracts a linear movement of the cover along the pivot axis in the direction of the disassembly position. In other words, the spring element tensions or presses the cover relative to the housing component in the direction of the storage position. For this purpose, the spring element engages one end on the bearing element and the other end on the cover or the housing component. If the bearing element is arranged on the cover, the spring element engages the other end on the cover.If the bearing element is arranged on the housing component, the spring element also engages the housing component at the other end. Alternatively, the spring arrangement is formed by the aforementioned flexible wall section of the cover. When the cover is moved from the storage position to the disassembly position, the wall section is elastically deformed. The spring force resulting from the elastic deformation counteracts the displacement of the cover into the disassembly position. The elastic flexibility of the wall section can be achieved by an appropriate choice of material and / or design of the wall section. For example, the wall section can be comparatively thin-walled. Alternatively or additionally, the wall section can be made of a material that is comparatively flexible compared to other components and / or sections of the medical device.

[0006] The corresponding bearing element or the corresponding bearing element receptacle is preferably formed integrally on the dimensionally flexible wall section.

[0007] In a further embodiment of the invention, a support arrangement is provided which is operatively connected to the cover and the housing component and by means of which the cover can be positively supported on the housing component against a linear movement directed into the disassembly position, wherein the support is effected at least in the covering position and wherein the support is canceled in a defined pivoting position of the cover for its disassembly. The support arrangement counteracts unintentional disassembly of the cover in the covering position and / or when pivoting about the pivot axis. To this end, the support arrangement effects, at least in the covering position, a positive connection between the cover and the housing component which is effective along the pivot axis and thus axially. This axial positive connection acts in the covering position and blocks an axial linear movement of the cover into the disassembly position. In contrast, the axial positive connection is canceled in the defined pivoting position.This allows the cover to be displaced axially along the pivot axis—and against the spring force of the spring arrangement—into the disassembly position. The support arrangement is preferably formed by functional sections integrally formed on the cover and / or the housing component. Alternatively or additionally, the support arrangement can comprise separate components that can be joined to the cover and / or the housing component. The support is provided between axially opposing components and / or sections of the cover and the housing component.

[0008] In a further embodiment of the invention, the support arrangement has at least one support element arranged on the cover, which is positively supported along the pivot axis on a support section of the housing component at least in the covering position, and which, in the defined pivot position of the cover, is pivoted away from the support section about the pivot axis and thus cannot be supported on the same. This enables a particularly simple construction of the support arrangement. The support element is preferably formed integrally on the cover. The support is preferably only canceled in the defined pivot position.

[0009] In a further embodiment of the invention, the defined pivot position is the release position or a pivot position of the lid pivoted further around the pivot axis starting from the release position. The first variant allows disassembly of the lid in the release position. In contrast, with the second variant, disassembly of the lid is not possible in the release position, but in the further pivoted pivot position. This prevents unintentional disassembly of the lid in the release position. This can achieve improved application safety.

[0010] In a further embodiment of the invention, the support arrangement has at least one counter-support element arranged on the cover, which is positively supported at least in the covering position along the pivot axis and opposite to the support element on a counter-support section of the housing component. This makes it possible, in particular, to achieve improved support of the cover in the covering position, namely on both sides. In one embodiment of the invention, the counter-support element is also supported on the counter-support section in the release position and / or in the further pivoted pivot position of the cover. This offers, in particular, improved lateral guidance of the cover when pivoting about the pivot axis. The counter-support element is preferably formed integrally on the cover.

[0011] In a further embodiment of the invention, a holding arrangement is provided which is operatively connected to the cover and the housing component and by means of which the cover is held in the release position against a pivoting movement directed into the covering position. The holding arrangement thus prevents the cover from unintentionally pivoting back from the release position into the covering position, for example under the influence of gravity. The holding arrangement is preferably formed by functional sections formed integrally on the cover and / or the housing component. Alternatively or additionally, the holding arrangement can have separately manufactured components which are joined to the cover or the housing component. In the release position, the holding arrangement preferably acts in a form-fitting manner. Alternatively or additionally, the holding arrangement can in particular act magnetically.

[0012] In a further embodiment of the invention, the holding arrangement has a locking element arranged on the housing component, which can be latched over by a latching section of the cover by means of a pivoting movement of the cover, wherein the latching section releasably engages behind the latching element in a form-fitting manner in the covering position. This allows for a structurally particularly simple and robust design of the holding arrangement. When the latching element is latched over, the latching section and the latching element perform an axial relative movement directed along the pivot axis. This is in addition to the relative movement resulting from the pivoting movement. In a further embodiment of the invention, the latching element and the latching section are resiliently mounted relative to one another along the pivot axis by means of the spring arrangement. The function of the holding arrangement is thereby supported in a particularly advantageous manner by means of the spring arrangement.The retaining arrangement interacts with the spring arrangement. The latter pushes the cover laterally toward the storage position. As a result, the locking element and the locking section are axially resiliently supported against each other indirectly via the spring arrangement. This enables, in particular, smooth locking during the pivoting movement. Furthermore, the spring arrangement supports the positive locking between the locking section and the locking element.

[0013] In a further embodiment of the invention, the cover has two side cheeks which are arranged at a distance from one another along the pivot axis and are angled relative to a cover upper side, wherein the pivot bearings and / or the spring arrangement and / or the support arrangement and / or the holding arrangement are formed at least in sections as one piece on at least one of the side cheeks. This embodiment of the invention enables a particularly advantageous reduction in the required number of components. This results in a particularly simple structure. In addition, the one-piece design supports disassembly and assembly, since the correspondingly one-piece components and / or sections are arranged virtually captively on the at least one side cheek and thus on the cover. The side cheeks are located axially opposite one another with respect to the pivot axis. In the covering position, the side cheeks engage over the housing component in a lateral direction.In combination with this embodiment of the invention, manufacturing the lid as a plastic injection-molded component is particularly advantageous.

[0014] Further advantages and features of the invention emerge from the claims and from the following description of a preferred embodiment of the invention, which is illustrated with reference to the drawings. Fig. 1 shows a schematically highly simplified representation of a section of an embodiment of a medical device according to the invention for extracorporeal blood treatment with a housing component and a cover hidden in the drawing, Fig. 2 in a schematic perspective representation of an arrangement known from the prior art comprising a housing component, a cover and a pivot bearing arrangement for pivoting the cover on the housing component, Fig. 3 in a - with respect to the plane of the drawing of the Fig. 1 - from top to bottom view, the housing component of the device Fig. 1 with the lid mounted thereon and assuming a covering position, Fig. 4 in a - with respect to the plane of the drawing of the Fig. 1 - partially cut-off front view of the housing component and the cover in the area of ​​a pivot axis, with the cover pivoting from the cover position to Fig. 3 towards a release position ( Fig. 5 ) is pivoted, Fig. 5the housing component and the cover in one of the Fig. 4 corresponding representation, wherein the cover assumes the release position, Fig. 6 the housing component and the cover in a section-wise sectional view, wherein the sectional plane runs through the pivot axis, and Fig. 7 in a cut-off perspective view the housing component with the cover mounted thereon, wherein the cover assumes the release position and is shown partially transparent.

[0015] According to Fig. 1 a medical device V for extracorporeal blood treatment is shown in sections and designed in the form of a dialysis machine. Fig. 1 essentially shows an entire extracorporeal blood circuit of the medical device V. This has an arterial blood line 1, by means of which blood to be treated is fed from a patient (not shown) to a peristaltic pump 2 of the medical device V. An arterial pressure sensor 3 is provided upstream of the peristaltic pump 2 in relation to a blood flow direction. The pressure in the arterial blood line 1 upstream of the peristaltic pump 2 can be measured by means of the arterial pressure sensor 3. This pressure can also be referred to as the low-pressure side pressure. In the blood flow direction downstream of the peristaltic pump 2 - and thus on the high-pressure side - a high-pressure blood line 4 leads to an arterial air trap 5. In this case, a supply line 6 is arranged at an outlet of the peristaltic pump 2 and is connected to a pump 7. An additive, for example heparin for blood thinning, can be added via the supply line 6.From the arterial air trap 5, a line 8 carries the blood to be treated to a dialyzer 9, which receives dialysis fluid at its inlet via a dialysis fluid supply line 10. In the dialyzer 9, the blood is treated in a known manner using the dialysis fluid. Used dialysis fluid, which can also be referred to as dialysate, is drained from the dialyzer 9 via a dialysis fluid drain 11 and sent for disposal or processing (not shown). The blood to be treated is led from the dialyzer 9 via a blood drain 12 to a venous air trap 13 for air separation. Downstream of this is an air detector / air bubble detector 14, which detects whether air in the system that could be dangerous to the patient. A venous pressure sensor 15 is provided on the venous air trap 13, by means of which the venous pressure can be measured.From the air trap 13 via the air detector / air bubble detector 14, the treated blood is returned to the patient via a venous blood line 16. Furthermore, a control and monitoring device 17 is provided for controlling and monitoring the medical device V. The medical device V is encapsulated in a housing G having a housing front 100, on which, in particular, the peristaltic pump 2 is mounted.

[0016] 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 an operational state of the medical device V, the pump housing 20 is covered by a cover, which will be described in more detail below and which is pivotally mounted on the pump housing 20 by means of a pivot bearing arrangement, which will also be described in more detail below. Both the cover and the pivot bearing arrangement are in Fig. 1 not shown for graphic reasons.

[0017] To clarify the basic structure and function of the peristaltic pump 2, first Fig. 2 reference is made. Fig. 2 shows a peristaltic pump known from the prior art with a pump housing 200, a cover 240 and a pivot bearing arrangement 250. The pump housing 200 has a receiving recess 210, which can also be referred to as a pump bed. In the receiving recess 210, a Fig. 2 A rotor (not shown) is driven and rotatably received. The receiving recess 210 is laterally delimited by a support surface 230 extending in an arc around the rotor axis 190 and radially spaced from the rotor.

[0018] The cover 240 is pivotally connected to the pump housing 200 by means of the pivot bearing arrangement 250 about a pivot axis S0. The cover 240 takes Fig. 2 an open state in which the receiving recess 210 - with respect to the plane of the drawing of the Fig. 2 - is released upwards. This state can also be referred to as the release position. In a closed state, the cover 240 covers the receiving recess 210 upwards. This state can also be referred to as the covering position.

[0019] The basic functioning of the peristaltic pump 2 for pumping the blood between the low pressure and the high pressure side is identical to the functioning of the Fig. 2 shown peristaltic pump according to the prior art. For this purpose, an elastically deformable hose line 22 is arranged in the radial direction between the rotor 18 and the support surface 23 (cf. Fig. 4 ) of the pump housing 20. The hose line 22 is fluidically connected at its opposite ends to the arterial blood line 1 and the high-pressure blood line 4 in a manner known to those skilled in the art. To pump the blood, the rotating rotor 18 acts on the hose line 22 so that it is elastically squeezed in sections between the rotor 18 and the support surface 23. The resulting squeezing of the hose line 22, which can also be referred to as occlusion, migrates with the rotating rotor 18 around the rotor axis 19, as it were, whereby the blood is pumped from the low-pressure to the high-pressure side.

[0020] In the peristaltic pump known from the state of the art according to Fig. 2 The cover 240 is comparatively difficult to disassemble and assemble due to the design of the pivot bearing arrangement. Fig. 3 bis 7 The inventive design, which can be seen in detail, overcomes this disadvantage in particular.

[0021] There it is shown that the cover 24 is mounted on the pump housing 20 by means of a pivot bearing arrangement 25, 25a and is pivotally movable about a pivot axis S relative to the pump housing 20. In Fig. 3 the cover 24 assumes the covering position. In this position, the receiving recess 21 of the pump housing 20 is covered by the cover 24. Starting from the covering position, the cover 24 can be pivoted about the pivot axis S in the direction of a release position relative to the pump housing 20. Fig. 5 , 6 and 7, the cover 24 assumes the release position. In this position, the receiving recess 21 is - with respect to the plane of the drawing of the Fig. 3 - released upwards. In the Fig. 1 In the ready-to-use state shown, the pump housing 20 and the cover 24 are mounted on the housing front 100 in such a way that the pivot axis S extends horizontally in the region of an unspecified upper edge of the pump housing 20.

[0022] In the embodiment shown, the pivot bearing arrangement 25, 25a has two pivot bearings that are arranged spaced apart from one another along the pivot axis S. The pivot bearings of the pivot bearing arrangement 25, 25a are also referred to below as the first pivot bearing 25 and the second pivot bearing 25a.

[0023] The pivot bearings 25, 25a each have a bearing element 26, 26a and a bearing element receptacle 27, 27a. The bearing elements 26, 26a each engage in the axial direction with the respective bearing element receptacle 27, 27a and are pivotally movable relative thereto about the pivot axis S. The bearing elements 26, 26a are also referred to below as the first bearing element 26 and the second bearing element 26a. The same applies to the bearing element receptacles 27, 27a, which are also referred to as the first bearing element receptacle 27 and the second bearing element receptacle 27a.

[0024] In particular, based on Fig. 6 It can be seen that the bearing elements 26, 26a and the bearing element receptacles 27, 27a are not merely pivotally mounted relative to one another about the pivot axis S. Rather, a limited linear mobility in the axial direction of the pivot axis S is simultaneously ensured between the bearing elements 26, 26a and the respective bearing element receptacles 27, 27a.

[0025] For this purpose, in the embodiment shown, the second bearing element 26a is designed in the form of a bearing pin P and is accommodated in a receiving bore 28 of the pump housing 20 with limited axial movement. As a result of this movable accommodation of the bearing pin P, the cover can be moved relative to the pump housing 20 in the lateral direction, ie axially along the pivot axis S. The Fig. 3 bis 7 The axial position of the cover 24 in relation to the pump housing 20 can also be referred to as the storage position. In this storage position, both bearing elements 26, 26a are in engagement with the respective bearing element receptacle 27, 27a. Starting from the storage position, the cover 24 can be moved - with respect to the drawing planes of the Fig. 4 , 5 , 6 - be pressed to the left until the first bearing element receptacle 27 disengages from the first bearing element 26. The cover 24 is then in a disassembly position. This allows easy manual removal of the cover 24 from the pump housing 20. The same applies analogously to the assembly of the cover 24.

[0026] In order to prevent unintentional disassembly of the cover 24, a spring arrangement 29 is also provided, by means of which the cover 24 is spring-mounted along the pivot axis S and is elastically prestressed in the direction of the bearing position relative to the pump housing 20.

[0027] In the embodiment shown, the spring arrangement 29 is designed as a spring element F. The spring element F is integrated into the bearing pin P, so that this can also be referred to as a spring pin P. The spring element F is supported at one end—at least indirectly—on the pump housing 20 and at the other end engages a rear side (not designated in more detail) of a head portion 30a of the bearing pin P. The head portion 30a engages in the second bearing element receptacle 27a.

[0028] In an embodiment not shown in the drawing, an alternative configuration of the spring arrangement is provided. In this embodiment, the bearing pin P is arranged axially immovably on the pump housing 20, and the resilient mounting and preload in the axial direction are achieved by means of an elastically flexible design of the cover 24 in the region of a wall section W. Due to the flexible design of the wall section W, the cover can be pushed laterally toward the disassembly position despite the axially fixed arrangement of the bearing pin P.

[0029] In the illustrated embodiment, the first bearing element 26 is designed as a bearing journal. Accordingly, the first bearing element receptacle 27a is designed as a journal receptacle.

[0030] Furthermore, in particular Fig. 6 It can be seen that the bearing element receptacles 27, 27a are each formed integrally on the cover 24. The bearing elements 26, 26a, in contrast, are arranged on the pump housing 20, with the first bearing element 26 being formed integrally on the pump housing 20. In contrast, the second bearing element 26a or the bearing pin P is manufactured as a separate component and joined to the pump housing 20 by insertion into the receiving bore 28.

[0031] In order to prevent unintentional removal of the cover 24 from the pump housing 20, a support arrangement T formed between the cover 24 and the housing component 20 is provided in the embodiment shown ( Fig. 7 ). By means of the support arrangement T, the cover 24 can be supported in a form-fitting manner on the pump housing 20 against a linear movement directed into the disassembly position. In this case, this support is effected at least in the covering position. In contrast, the support is in a defined pivot position ( Fig. 7 ), whereby the cover 24 - due to the lack of positive lateral support on the pump housing 20 - can be moved from the storage position into the disassembly position.

[0032] In the embodiment shown, the defined pivot position of the lid 24 is the release position. In an embodiment not shown, the defined pivot position for removing the lid 24 is a pivot position of the lid 24 that is further pivoted about the pivot axis S, starting from the release position.

[0033] In the present case, the support arrangement comprises a support element 31 arranged on the cover 24, which cooperates positively with a support section 32 arranged on the pump housing 20 for support. The support section 32 is formed by a lateral outer surface of the pump housing 20. The support element 31 is formed integrally on the cover 24 and lies opposite the support section 32 in the axial direction of the pivot axis S. This is at least in the covering position. In the Fig. 7 In the release position shown, the support element 31, together with the cover 24, is pivoted away from the support section 32 about the pivot axis S and thus cannot be supported axially thereon. In other words, the support element 31 blocks the axial mobility of the cover 24, at least in the covering position, such that the cover 24 cannot be moved from the storage position into the disassembly position. Even during a pivoting movement of the cover 24 starting from the covering position, the support element 31 remains positioned axially relative to the support section 32, so that the axial mobility of the cover is then also blocked. Only in the defined pivoting position of the cover 24, here the release position, is the support element 31 no longer positioned relative to the support section 32, so that the axial mobility of the cover in the direction of the disassembly position is released.

[0034] In the embodiment shown, the support arrangement T also has a further support element 33. The support element 33 ensures the most flat support possible on the support section 32, particularly in the covering position.

[0035] Furthermore, the support arrangement T in the present case has a counter-support element 34 arranged on the cover ( Fig. 6 , 7 ), which in any case in the covering position is supported axially and opposite to the support element 32 on the pump housing 20. For this purpose, the pump housing 20 has a counter-support section 35. The counter-support section 35 is formed in a manner corresponding to the support section 32 by a side surface of the pump housing 20. The counter-support element 34 and the counter-support section 35 lie opposite one another in the axial direction of the pivot axis S and act - with respect to the plane of the drawing of the Fig. 6 - from left to right axial movement of the cover 24. This prevents, in particular, an unintentional disengagement of the bearing pin P from the second bearing element receptacle 27a. In the embodiment shown, the counter-support element 34 is positioned axially opposite the counter-support section 35 over the entire pivoting 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 covering position, but also in all other pivoting positions.

[0036] In relation to Fig. 1 In the release position, the cover 24 protrudes obliquely upwards and forwards from the pump housing 20. In order to hold the cover 24 in the release position against the effect of gravity, a holding arrangement H is provided in the present case. The holding arrangement H holds the cover in the release position against a pivoting movement directed into the covering position. The holding arrangement H is formed between the cover 24 and the pump housing 20. In the present case, the holding arrangement H has a locking element 36 arranged on the pump housing 20 and a locking section 37 formed on the cover 24. The locking element 36 protrudes laterally from the pump housing 20 in the axial direction of the pivot axis S and is arranged in the present case in the region of the counter-support section 35. The locking element 36 is provided with a rounded locking contour 38 on an outer end region. The locking section 37 is formed integrally on the cover 24 and has a chamfered locking contour 39 ( Fig. 4 ). By means of a pivoting movement of the cover 24, the locking element 36 can be locked over by the locking section 37. In this case, the chamfered locking contour 39 initially comes into sliding contact with the rounded locking contour 38 of the locking element 36. This is shown in Fig. 4 shown. Here, the locking portion 37 is pressed outward in the axial direction relative to the locking element 36. After the locking element has been over-locked, the locking portion 37 engages behind the rounded locking contour 38, so that the cover 24 is held in the release position with a positive fit.

[0037] When the locking element 36 is over-engaged, the retaining arrangement H advantageously cooperates with the spring arrangement 29. This is because the previously described axial deflection movement of the locking section 37 and thus of the entire cover 24 is supported by the spring-loaded mounting of the bearing pin P. This ensures that the previously described over-engaging movement is particularly smooth and low-wear. At the same time, the spring-loaded mounting or preload by the spring arrangement 29 supports the secure engagement of the locking element 36.

[0038] Furthermore, the cover 24 in this case has two side cheeks 40, 40a arranged spaced apart from one another along the pivot axis S, which can also be referred to as the first side cheek 40 and the second side cheek 40a. The side cheeks 40, 40a are angled relative to a cover top 41 of the cover 24, with an angle of approximately 90° being provided in this case. The side cheeks 40, 40a laterally overlap the pump housing 20 in the covering position. The side cheeks 40, 40a are arranged axially opposite the counter-support section 35 and the support section 32 of the pump housing 20, respectively.

[0039] The bearing element receptacles 27, 27a are formed in the region of the side cheeks 40, 40a. More precisely, the first bearing element receptacle 27 is formed on the first side cheek 40. The bearing element receptacle 27 extends through the first side cheek 40 in the form of a through-bore. The second bearing element receptacle 27a is formed in the region of the second side cheek 40a.

[0040] In addition, the support arrangement T is also formed at least in sections in the area of ​​the side cheeks 40, 40a ( Fig. 7 ). The support element 31 and the further support element 33 are formed on an inner side of the second side cheek 40a. The counter-support element 34 is formed on an inner side of the first side cheek 40 opposite the inner side of the second side cheek 40a.

[0041] In addition, the holding arrangement H is also formed at least partially in the region of the side cheeks 40, 40a. More precisely, the locking section 37 is formed on the inside of the first side cheek 40.

[0042] The above-described, preferably one-piece, design of the corresponding functional sections of the pivot bearing assembly 25, 25a, the support assembly T, and the holding assembly H on the side walls 40, 40a, particularly their inner sides, is particularly advantageous. In the embodiment shown, the cover 24 is manufactured as a plastic injection-molded component.

Claims

1. A medical appliance (V) for extracorporeal blood treatment, having - a housing component (20), a cover (24) and a pivot bearing arrangement (25, 25a) by means of which the cover (24) is mounted on the housing component (20) and so as to be pivotable about a pivot axis (S) relative to the housing component (20), - wherein the cover (24) is pivotable at least between a covering position, in which the cover (24) covers the housing component (20), and a release position, in which the cover (24) releases the housing component (20), - and wherein the pivot bearing arrangement (25, 25a) has at least two pivot bearings (25, 25a) arranged spaced apart from one another along the pivot axis (S), - characterized in that the pivot bearings (25, 25a) each have a bearing element (26, 26a) and a bearing element receptacle (27, 27a), - wherein the bearing elements (26, 26a) engage in the respective bearing element receptacle (27, 27a) and are pivotable about the pivot axis (S) and linearly movable to a limited extent along the pivot axis (S), relative to said bearing element receptacle, - as a result of which the cover (24) can be shifted in a linearly movable manner along the pivot axis (S) relative to the housing component (20) between a removal position, in which at least one of the bearing elements (26, 26a) is not in engagement with the respective bearing element receptacle (27, 27a), and a bearing position, in which the two bearing elements (26, 26a) are in engagement with the respective bearing element receptacle (27, 27a), - and wherein a spring arrangement (29) is provided by means of which the cover (24) is mounted resiliently along the pivot axis (S) and is elastically pretensioned relative to the housing component (20) in the direction of the bearing position.

2. The medical appliance (V) as claimed in claim 1, characterized in that the spring arrangement (29) has at least one spring element (F) which at one end acts on one of the bearing elements (26, 26a) and at the other end is at least indirectly supported on the cover (24) or the housing component (20), or in that the spring arrangement is formed by an elastically dimensionally flexible wall portion (W) of the cover (24), on which wall portion (W) one of the bearing elements (26, 26a) or one of the bearing element receptacles (27, 27a) is formed.

3. The medical appliance (V) as claimed in claim 1 or 2, characterized in that a support arrangement (T) which is operatively connected to the cover (24) and to the housing component (20) is provided by means of which the cover (24) can be supported in a form-fitting manner on the housing component (20) counter to a linear movement directed toward the removal position, wherein the support is brought about at least in the covering position, and wherein the support is removed in a defined pivoted position of the cover (24) for removal thereof.

4. The medical appliance (V) as claimed in claim 3, characterized in that the support arrangement (T) has at least one support element (31) which is arranged on the cover (24) and, at least in the covering position, is supported in a form-fitting manner along the pivot axis (S) on a support portion (32) of the housing component (20), and which, in the defined pivoted position of the cover (24), is pivoted away from the support portion (32) about the pivot axis (S) and therefore cannot be supported on said support portion.

5. The medical appliance (V) as claimed in claim 3 or 4, characterized in that the defined pivoted position is the release position or a pivoted position of the cover (24) pivoted from the release position further about the pivot axis (S).

6. The medical appliance (V) as claimed in one of claims 3 to 5, characterized in that the support arrangement (T) has at least one mating support element (34) which is arranged on the cover (24) and, at least in the covering position, is supported in a form-fitting manner along the pivot axis (S) and counter to the support element (31) on a mating support portion (35) of the housing component (20).

7. The medical appliance (V) as claimed in one of the preceding claims, characterized in that a holding arrangement (H) which is operatively connected to the cover (24) and to the housing component (20) is provided by means of which the cover (24) is held in the release position counter to a pivoting movement directed into the covering position.

8. The medical appliance (V) as claimed in claim 7, characterized in that the holding arrangement (H) has a latching element (36) which is arranged on the housing component (20) and over which a latching portion (37) of the cover (24) can latch by means of a pivoting movement of the cover (24), wherein the latching portion (37) grips releasably in a form-fitting manner behind the latching element (36) in the covering position.

9. The medical appliance (V) as claimed in claim 8, characterized in that the latching element (36) and the latching portion (37) are mounted resiliently relative to each other along the pivot axis (S) by means of the spring arrangement (29).

10. The medical appliance (V) as claimed in one of the preceding claims, characterized in that the cover (24) has two side members (40, 40a) which are arranged spaced apart from each other along the pivot axis (S) and are angled in relation to a cover top side (41), wherein the pivot bearings (25, 25a) and / or the spring arrangement (29) and / or the support arrangement (T) and / or the holding arrangement (H) are formed integrally at least in sections on at least one of the side members (40, 40a).