BEARING DEVICE FOR A HEART SUPPORT SYSTEM, AND METHOD FOR RINSING A SPACE IN A BEARING DEVICE FOR A HEART SUPPORT SYSTEM

Abstract

The disclosure relates to a bearing device for a cardiac support system. The bearing device comprises a stand unit and an impeller. The stand unit is designed to support the impeller such that it can rotate. The impeller is designed to rotate during an operation of the cardiac support system in order to convey a pump fluid flow. The impeller is designed to enclose at least one subsection of the stand unit in the assembled state of the bearing device, wherein an intermediate space for guiding a flushing fluid flow is provided between the subsection and the impeller. At least one flushing outlet is formed in the impeller. The flushing outlet is designed to discharge the flushing fluid flow from the intermediate space by means of centrifugal force when the cardiac support system is in operation.

Claims

1. A heart pump comprising: a housing comprising one or more discharge openings; a support structure positioned within the housing, the support structure disposed along an axis of rotation; an impeller positioned radially outward from at least a portion of the support structure and configured to rotate about the axis of rotation, the impeller comprising one or more flushing outlets each having a longitudinal axis extending away from the support structure and parallel to a plane orthogonal to the axis of rotation, wherein the longitudinal axes of the flushing outlets are configured to intersect the discharge openings of the housing as the impeller rotates about the axis of rotation; and an intermediate space formed between the impeller and the portion of the support structure.

2. The heart pump of claim 1, wherein a flushing flow is induced by the rotation of the impeller about the axis of rotation, the flushing flow configured to enter the intermediate space at an inlet positioned between the impeller and the support structure and to exit the intermediate space through the flushing outlets.

3. The heart pump of claim 2, wherein the flushing flow exits the heart pump through the discharge openings of the housing after exiting the flushing outlets of the impeller.

4. The heart pump of claim 1, wherein the housing further comprises a hollow cylindrical body, wherein the discharge openings extend through a wall of the hollow cylindrical body.

5. The heart pump of claim 1, wherein the impeller comprises a jacket section, wherein the jacket section axially overlaps the portion of the support structure.

6. The heart pump of claim 5, wherein the jacket section is a hollow cylindrical body having an inner surface and an outer surface positioned radially outward from the inner surface.

7. The heart pump of claim 5, wherein the jacket section of the impeller is parallel with the portion of the support structure.

8. The heart pump of claim 5, wherein the one or more flushing outlets are positioned in the jacket section.

9. The heart pump of claim 5, wherein the impeller further comprises a region of a propeller and a transition section positioned between the region of the propeller and the jacket section.

10. The heart pump of claim 9, wherein the one or more flushing outlets are positioned in the transition section.

11. The heart pump of claim 9, wherein the one or more flushing outlets are positioned in the region of the propeller.

12. The heart pump of claim 1, wherein the intermediate space extends between an outer surface of the portion of the support structure and an inner surface of the impeller.

13. A heart pump comprising: a housing comprising one or more discharge openings; a support structure positioned within the housing, the support structure disposed along an axis of rotation; an impeller positioned radially outward from at least a portion of the support structure and configured to rotate about the axis of rotation, the impeller comprising one or more flushing outlets each having a longitudinal axis extending away from the support structure and parallel to a plane orthogonal to the axis of rotation, wherein the longitudinal axes of the flushing outlets are configured to intersect the discharge openings of the housing as the impeller rotates about the axis of rotation; and a fluid flow path extending from a flushing inlet positioned between an end of the impeller and the portion of a support structure to the discharge openings through the flushing outlets.

14. The heart pump of claim 13, wherein a flushing flow is induced by the rotation of the impeller about the axis of rotation.

15. The heart pump of claim 13, wherein the impeller comprises a jacket section, a region of a propeller, and a transition section positioned between the region of the propeller and the jacket section, wherein the jacket section axially overlaps the portion of the support structure.

16. The heart pump of claim 15, wherein the one or more flushing outlets are positioned in the transition section.

17. The heart pump of claim 15, wherein the one or more flushing outlets are positioned in the jacket section.

18. The heart pump of claim 13, wherein the flushing inlet comprises a longitudinal axis.

19. The heart pump of claim 18, wherein the longitudinal axis of the flushing inlet is parallel to the axis of rotation.

20. The heart pump of claim 18, wherein the longitudinal axis of the flushing inlet intersects the discharge openings of the housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The figures show:

[0046] FIG. 1 a first sliding bearing device for a cardiac support system comprising an impeller and comprising a stand unit as a section;

[0047] bearing device;

[0048] FIG. 2 a portion of a cardiac support system comprising the first sliding

[0049] FIG. 3 a side view of the first sliding bearing device;

[0050] FIG. 4 a rear view of the impeller in the direction of the arrow IV of FIG. 3;

[0051] FIG. 5 other possible designs of an impeller in a sliding bearing device for a cardiac support system;

[0052] FIG. 6 an intermediate space having various flushing fluid volumes in different sliding bearing devices for a cardiac support system with different configurations of flushing outlets;

[0053] FIG. 7 a further sliding bearing device comprising an impeller and comprising a stand unit;

[0054] FIG. 8 the further sliding bearing device comprising an impeller and comprising a stand unit as a section;

[0055] FIG. 9 a detail of a further sliding bearing device for a cardiac support system in a sectional view;

[0056] FIG. 10 the detail of the further sliding bearing device for a cardiac support system of FIG. 9 in a plan view;

[0057] FIG. 11 a detail of a further sliding bearing device for a cardiac support system in a sectional view; and

[0058] FIG. 12 a flow diagram of a method for producing a sliding bearing device.

DETAILED DESCRIPTION

[0059] In the following description of favorable design examples of the present disclosure, the same reference signs are used for the elements shown in the various figures, which are the same or have a similar effect, whereby a repeated description of these elements is omitted.

[0060] FIG. 1 shows a schematic illustration of a bearing device 100 for a cardiac support system which is configured as a sliding bearing device according to one design example. The bearing device 100 comprises a stand unit 105 and an impeller 110. The stand unit 105 is configured to support the impeller 110 such that it can rotate about an axis of rotation 112 which is coaxial with the longitudinal axis 114 of the impeller 110. The impeller 110 is designed to rotate about the axis of rotation 112 when the cardiac support system is in operation in order to convey a pump fluid flow 115. In the assembled state of the sliding bearing device shown here, the impeller 110 encloses at least one subsection 120 of the stand unit 105. An intermediate space 125 for guiding a flushing fluid flow 130 is provided between the subsection 120 and the impeller 110. At least one flushing outlet 135 is formed in the impeller 110. The flushing outlet 135 is designed to discharge the flushing fluid flow 130 from the intermediate space 125 by means of centrifugal force when the cardiac support system is in operation.

[0061] The flushing outlet 135 comprises a discharge opening 140 for discharging the flushing fluid flow 130, which has an opening cross-section 132, in which, at at least one location, an opening cross-section normal vector 134 has a directional component 136 which faces away from the axis of rotation 112 and is radial to the axis of rotation 112.

[0062] According to the design example shown here, the flushing outlet 135 is inclined relative to the longitudinal axis 114 of the impeller 110 which is coaxial with the axis of rotation 112. The flushing outlet 135 comprises an axis 137 along which said flushing outlet 135 extends and which is thus a longitudinal extension axis of the flushing outlet 135, which is inclined relative to the longitudinal axis 114 of the impeller 110 and forms an acute angle with it. It should be noted that this axis 137 can also be inclined relative to the longitudinal axis 114 of the impeller 110.

[0063] Furthermore, according to the design example shown here, the flushing outlet 135 is configured as a tube with a discharge opening 140. The discharge opening 140 is disposed at an end of the tube facing away from the intermediate space 125.

[0064] According to the design example shown here, the sliding bearing device 100 also comprises a flushing inlet 145 for introducing the flushing fluid flow 130. In the assembled state of the bearing device 100 shown here, the flushing inlet 145 opens into the intermediate space 125.

[0065] According to the design example shown here, the flushing inlet 145 is configured as a gap between a base 107 of the stand unit 105 and a jacket section 150 of the impeller 110 enclosing the subsection 120 of the stand unit 105. It should be noted that the flushing inlet can in principle also be configured as an inlet channel in the impeller 110.

[0066] In the sliding bearing device shown in FIG. 1, the flushing inlet 145 is disposed downstream with respect to the flushing outlet 135 in the flow direction of the pump fluid flow 115 as in the design example shown here. FIG. 1 shows a flushing fluid flow 130 with a flushing path for flushing the bearing device 100 which extends from the flushing inlet 145 through the intermediate space 125 to the flushing outlet 135 with the discharge opening 140.

[0067] FIG. 2 shows a perspective view of a portion of a cardiac support system 200 with the sliding bearing device 100 in the form of a left ventricular cardiac support pump (LVAD heart pump). FIG. 3 is a side view of the bearing device 100.

[0068] The bearing device 100 and its function in a cardiac support system are described in more detail in the following:

[0069] The impeller 110 is a rotor that forms a rotating component in the bearing device 100 of the cardiac support system 200, which is supported magnetically or by means of sliding bearings, wherein the rotating component is positioned over a fluid to dissipate heat or reduce friction. When the impeller 110 is positioned directly in the blood during operation of the cardiac support system, as is the case, for example, with the left ventricular cardiac support pump (LVAD heart pump) shown in FIG. 2 in the implanted state of the cardiac support system, it is beneficial to flush the bearing device 100 to dissipate heat and prevent the formation of thromboses (blood clotting). To enable robust flushing of the sliding bearing device 100, a constant flow is necessary. Flushing the sliding bearing device 100 prevents the formation of thromboses. A pump design (such as baffles) that converts mechanical energy into hydrodynamic energy can be used for this purpose. With the sliding bearing device 100 shown in FIG. 1 and FIG. 2, it is possible to utilize the centrifugal force on the flushing outlet 135 rotating with the impeller 110 using only a bore in the form of the flushing outlet 135. The centrifugal force represents the driving force for the flushing. Such a structure is inexpensive to produce.

[0070] A plurality of flushing outlets 135 can alternatively also be provided at different locations on the impeller 110 to utilize the centrifugal force, as shown in the following figures.

[0071] Using a design example of the bearing device 100 shown here, introduction can be realized by suctioning out the flushing fluid flow 130 with the aid of the centrifugal force at the flushing outlet 135. Structurally, this is achieved by configuring the flushing outlet 135 such that the flushing outlet 135 is enclosed by the rotating component, the impeller 110, e.g., by having a bore as the flushing outlet 135, while the inlet side in the form of flushing inlet 145 is not or only partially, e.g., only on one side, subject to the rotation. This is achieved by configuring the flushing inlet 145 with at least one section of the stand unit 105 as a wall section. In this case, the statistical pressure difference has practically no effect on the flushing flow of the flushing fluid flow 130, which is why the flushing effect of the bearing device 100 is substantially determined by the centrifugal force and the rotational speed of the pump of the cardiac support system. The flushing effect of the bearing device 100 is thus largely independent of other potential influencing variables, such as the magnitude of the mass flow or the level of the pressure build-up through or over the cardiac support system. Consequently, there is no need for a static pressure difference to flush the bearing device 100. The positioning of the flushing outlet 135 in the impeller 110, which is trumpet-shaped here as an example, with widely varying diameters relative to a longitudinal extension axis 114 of said impeller 110, can therefore be realized in different ways, whereby a positioning of the flushing outlet 135 far upstream of the longitudinal extension of the impeller 110 can be omitted. Complex structures, such as a pump wheel, or the application of a pressure difference in or around the sliding bearing device 100 are not necessary to effect the flushing of the sliding bearing device 100 either. Because of the independence from the pump flow, the pump flow of the pump fluid flow 115 shown here, the flushing of the bearing device 100 is possible without an absence of flushing as long as the impeller 110 is rotating.

[0072] In the design example discussed here, the bearing device 100 comprises the impeller 110 as a rotating part which, together with the stand unit 105 as a stationary part, forms a cylindrical sliding bearing. The flushing effect of the bearing device 100 is based on the centrifugal force that results from a rotation at the flushing outlet 135. The prerequisite for this is that, as shown here, at least one side at the flushing inlet 145 is stationary; in this case the inner side in the form of the stand unit 105. As a result, even if the pressure levels at the flushing inlet 145 and the flushing outlet 135 are comparable or the same, a constant flushing of the sliding bearing device 100 can be set due to the rotation of both sides of the flushing outlet 135 formed in the rotating impeller 110 or the fluid volume of the flushing outlet 135. The design example of the bearing device 100 shown here also makes it possible to flush a partially enclosed volume, which is shown here in block 155 which, as an example, is disposed around the fixed bearing of the stand unit 105, by combining a rotating and a stationary side. The reason for this is that the flushing fluid flow 130 is accelerated on the rotating side of the impeller as a result of the molecular adhesion conditions. The flushing fluid flow 130 is accelerated along the wall of the intermediate space 125 toward a larger diameter due to the centrifugal force, as a result of which the flushing fluid flow 130 is drawn in on the stationary side of the intermediate space 125 in the form of a wall of the stand unit 105. This causes the partially enclosed fluid of the flushing fluid flow 130 to be flushed, which allows heat at the fixed bearing of the stand unit 105, for example, to be absorbed and dissipated.

[0073] The cardiac support system 200 shown in FIG. 2 comprises a housing section 205. The impeller 110 of the bearing device 100 is located in the housing section 205 of the cardiac support system 200. In the cardiac support system 200, the impeller 110 is disposed in a housing section 205 on which an inlet hose 210 for supplying the fluid is provided. In the housing section 205 of the housing of the cardiac support system, there are discharge openings 215 for discharging the pump fluid flow 115. For connecting the inlet hose 210, the cardiac support system 200 comprises a connection section 220 which is connected to webs 225 of the housing section 205 that delimit two discharge openings 215 for discharging fluid conveyed by a rotation of the impeller 110 in the cardiac support system 200 from the housing section 205.

[0074] The housing section 205 of the cardiac support system 200 has a cylindrical, elongated structure with a substantially constant outer diameter for easy placement in a blood vessel, such as the aorta, by means of a catheter. The elongated axial design shown here allows transfemoral implantation of the cardiac support system 200. The sliding bearing device 100 is accordingly disposed in a window opening in the housing section 205 such that, in the implanted state of the cardiac support system 200, the rotating rotor component, the impeller 110, is positioned in the blood. Due to the axial design of the cardiac support system 200, the flow received by the impeller 110 is axial relative to the longitudinal axis 114 of the impeller 110, which corresponds to a longitudinal axis of the cardiac support system 200. The flushing outlet 135 in the impeller 110 is disposed in the region 111 of a propeller of the impeller 110, whereby the flushing outlet 135 is realized by a drilled hole or a through-bore or another type of through-hole in the impeller 110.

[0075] FIG. 3 shows the sliding bearing device 100 with the stand unit 105 and the impeller 110 in the assembled state, whereby the stand unit 105 forms the non-rotating counterpart to the rotating impeller 110. The stand unit 105 has a section which narrows in the direction of the impeller 110. The narrowed section of the stand unit 105 is mostly enclosed by the impeller 110. The stand unit 105 is connected to the impeller 110 and supports the impeller 110 such that it can rotate. The flushing outlet 135 having a discharge opening 140 is configured in the impeller 105. As an example, the discharge opening 140 of the flushing outlet here is disposed in the region of the propeller of the impeller 110.

[0076] FIG. 4 shows a perspective rear view of the impeller in the direction of the arrow IV of FIG. 3. The side of the impeller 110 facing away from the propeller of the impeller 110, which can be coupled to the stand unit 105 of the bearing device, is shown as the rear side of the impeller 110. To connect the impeller 110 to the stand unit 105, the impeller 110 here comprises a ball bearing 405 for supporting the impeller 110. The flushing outlets 135 of the impeller 110, which, as an example, are configured here as discharge bores and which communicate with the intermediate space 125 shown in FIG. 1, can be seen as well.

[0077] According to the design example shown here, at least one pair of flushing outlets 135 is configured in the impeller 110. The flushing outlets 135 of the at least one pair are disposed opposite one another with respect to a longitudinal axis 114 of the impeller 110. As an example, the flushing outlets 135 of the pair are evenly spaced with respect to the axis of rotation 112 of the impeller 110, i.e., they extend symmetrically relative to a longitudinal axis 114 of the impeller 110 coaxial with the axis of rotation 112.

[0078] FIG. 5 shows further possible designs of an impeller 110 in a bearing device for a cardiac support system, which can be configured as a sliding bearing device or as a magnetic bearing device. The figure shows a perspective view of the impeller 110, wherein different example positionings of a discharge opening 140 of the flushing outlet 135 in the impeller 110 as well as a respective opening cross-section normal vector 134 and the longitudinal axis 114 of the impeller 110 are identified.

[0079] According to one design example, the discharge opening 140 of the flushing outlet 135 is disposed in a jacket section 150 of the impeller 110 enclosing the subsection of the stand unit. Alternatively, the discharge opening of the flushing outlet is disposed in a transition section 510 between a region of a propeller 515 of the impeller 110 and the jacket section 505.

[0080] This figure shows a potential estimate for the design example, where the strongest suction force occurs, and thus where a suitable location for positioning the flushing outlet and the discharge opening of the flushing outlet is. Three regions 520, 525 and 530 for disposing the discharge opening of the flushing outlet in the impeller 110 are shown as examples. The region 520 is located in the region of the propeller 515. The region 525, for example, identifies a position of the discharge opening of the flushing outlet 135 in the transition section 510. The region 530, for example, identifies a positioning of the discharge opening of the flushing outlet in the jacket section 150. According to the potential estimate shown here, when the flushing outlet 135 and the discharge opening 140 are positioned in the region 530, a beneficial flushing effect is achieved in a bearing device having such an impeller 110 and a stand unit 105 because the centrifugal force between the flushing inlet and the flushing outlet is sufficient to drive the flushing.

[0081] FIG. 6 shows the intermediate space 125 with different flushing fluid volumes in different bearing devices for a cardiac support system designed as a sliding bearing device or as a magnetic bearing device having different configurations of flushing outlets, wherein the flushing outlets 135 are configured differently. The flushing outlet 135, through which the flushing fluid flow passes, has different configurations 605, 610, 615, 620, 625 here. At least one pair of flushing outlets 135 is configured in the impeller of these sliding bearing devices, whereby the flushing outlets 135 of the at least one pair in a bearing device are disposed opposite one another with respect to the longitudinal axis 114 of the impeller 110 aligned with the axis of rotation 112. The respective configurations 605, 610, 615, 620, 625 of the flushing outlets shown here show examples of the pair of flushing outlets. In a first configuration 605, the flushing outlets of the pair extend radially from the longitudinal axis 114 of the impeller inclined at an obtuse angle with respect to said longitudinal axis 114 of the impeller, whereby a starting point of the flushing outlets 135 is formed in close proximity to the longitudinal axis 114. In a second configuration 610, the flushing outlets 135 of the pair extend inclined at an acute angle with respect to the longitudinal axis 114 of the impeller; the flushing outlets 135 of the pair are accordingly angled toward one another. A third configuration 615 corresponds to the first configuration 605 with the exception of the starting point of the flushing outlets 135, which are disposed further apart than the starting points of the flushing outlets of the first configuration 605. In a fourth configuration 620, the flushing outlets 135 of the pair extend at a right angle to the longitudinal axis 114 of the impeller. A fifth configuration 625 shows an example of two pairs of flushing outlets 135, which are disposed opposite one another with respect to the longitudinal axis 114 of the impeller and are disposed evenly spaced apart from one another. Like the pair shown in the fourth configuration 620, the two pairs of flushing outlets 135 extend at a right angle to the longitudinal axis 114 of the impeller.

[0082] FIG. 7 shows a further sliding bearing device 100 for a cardiac support system. The figure shows a perspective view of the sliding bearing device 100 in the assembled state, in which the impeller partly encloses the stand unit 105. FIG. 8 shows this sliding bearing device 100 as a section. The sliding bearing device 100 shown here is similar to the sliding bearing device described with reference to the preceding figures. According to the design example shown here, the impeller 110 comprises a plurality of flushing outlets 135. The discharge openings 140 of the flushing outlets are disposed at least partially in the transition section 510 between the propeller 515 and the jacket section 505. As an example, the discharge openings 140 are disposed evenly spaced around the periphery of the transition section 510. FIG. 7 shows a utilization of the flushing position of the plurality of flushing outlets having the suction force determined to be the strongest.

[0083] FIG. 8 shows a further sliding bearing device 100 for a cardiac support system. The figure shows a sectional view of a side view of the sliding bearing device 100. The stand unit 105 is partially enclosed by the jacket section 150 of the impeller 110. The plurality of discharge openings 140 of flushing outlets 135 is disposed in the transition region or transition section 510 between the propeller of the impeller 110 and the jacket section 150. The figure shows the flow direction of the pump fluid flow 115 and the flow path of the flushing fluid flow 130. The flushing fluid flow 130 is introduced through the flushing inlet 145 which, according to the design example shown here, is configured as a gap 905 between the base 107 of the stand unit 105 and the jacket section 505 of the impeller 110 enclosing the subsection 120 of the stand unit 105. The flushing fluid flow 130 is then conducted through the intermediate space 125 to one of the discharge openings 140 of the plurality of flushing outlets 135 by means of centrifugal force in order to flush the sliding bearing device 100.

[0084] FIG. 9 shows a schematic illustration of a detail of a sliding bearing device 100 for a cardiac support system according to one design example. The figure shows a cross-section of a part of the sliding bearing device 100 with the subsection of the stand unit 105 enclosed by the jacket section 150 of the impeller. The configuration of the flushing outlet 135 here is intended to show that the flushing outlets can also be disposed in a non-mirror-symmetrical manner. The figure shows a portion of the flushing path of the flushing fluid flow 130 that flows through the intermediate space 125 to the flushing outlet 135 and is discharged from the discharge opening of the flushing outlet 135. The outflow of the flushing fluid flow is shown in the following FIG. 10 with the aid of a plan view from the direction identified here with the arrow 1005.

[0085] FIG. 10 shows a schematic illustration of a detail of a sliding bearing device 100 for a cardiac support system according to one design example. The figure shows a plan view onto the detail of the sliding bearing device 100 identified in the preceding FIG. 9. The flushing outlet 135 is disposed in the jacket section 150 radially to a longitudinal extension axis 116 of the subsection of the stand unit 105 enclosed by the jacket section 505 which is aligned with the axis of rotation 112 in the bearing device. The flushing fluid flow 130 exits the jacket section 150 at the discharge opening 140 of the flushing outlet.

[0086] FIG. 11 shows a schematic illustration of a detail of a sliding bearing device 100 for a cardiac support system according to one design example. According to the design example shown here, the flushing inlet 145 is realized in the intermediate space 125 by a plurality of inlet channels, namely by the channel 1105 and the channel 1107. This is also intended to demonstrate that the inlet direction does not necessarily only have to be oriented in the direction of the longitudinal extension axis 116 of the bearing device 100 aligned with the axis of rotation 112 of the bearing device 100, but can also be inclined relative to said longitudinal extension axis. If the flushing inlet 145 is configured such that there is no acting centrifugal force there, for example such that the boundary of the flushing inlet 145 is not or only partially in the rotating body as in the design example of the flushing inlet 145 shown here as an inlet channel 1105 which is partially configured in the jacket section 150, the centrifugal pressure is advantageously increased.

[0087] FIG. 12 shows a flow diagram of a method 800 for producing a bearing device for a cardiac support system configured as a sliding bearing device or as a magnetic bearing device according to one design example. The method 800 comprises a step 801 of providing, a step 803 of forming, and a step 805 of assembling. In step 801 of providing, a stand unit is provided, which is configured to support an impeller such that it can rotate. Also provided in step 801 is the impeller, which is designed to rotate during an operation of the cardiac support system in order to convey a pump fluid flow. In step 803 of forming, at least one flushing outlet is formed in the impeller, which is designed to discharge a flushing fluid flow from the sliding bearing device by means of centrifugal force when the cardiac support system is in operation. In step 805 of assembling, the impeller and the stand unit are assembled to produce the sliding bearing device. At least one subsection of the stand unit is enclosed by the impeller. An intermediate space for guiding the flushing fluid flow is furthermore provided between said subsection and the impeller. During the operation of the cardiac support system, the flushing fluid flow is conducted from the intermediate space into the flushing outlet by means of centrifugal force and from there is discharged from the bearing device in order to flush the bearing device.

[0088] In summary, in particular the following should be noted: The disclosure relates to a bearing device 100 for a cardiac support system. The bearing device 100 comprises a stand unit 105 and an impeller 110. The stand unit 105 is designed to support the impeller 110 such that it can rotate. The impeller 110 is designed to rotate when the cardiac support system is in operation in order to convey a pump fluid flow 115. The impeller 110 is designed to enclose at least one subsection 120 of the stand unit 105 in the assembled state of the bearing device 100, wherein an intermediate space 125 for guiding a flushing fluid flow 130 is provided between the subsection 120 and the impeller 110. At least one flushing outlet 135 is formed in the impeller 110. The flushing outlet 135 is designed to discharge the flushing fluid flow 130 from the intermediate space 125 by means of centrifugal force when the cardiac support system is in operation.

[0089] The disclosure relates, in particular, to the aspects specified in the following clauses:

[0090] Clause 1. Sliding bearing device (100) for a cardiac support system (200), wherein the sliding bearing device (100) has the following features: [0091] a stand unit (105) is designed to support an impeller (110) such that it can rotate; and [0092] the impeller (110), which is configured to rotate when the cardiac support system (200) is in operation to convey a pump fluid flow (115), wherein the impeller (110) is designed to enclose at least one subsection (120) of the stand unit (105) in the assembled state of the sliding bearing device (100), wherein an intermediate space (125) for guiding a flushing fluid flow (130) is provided between the subsection (120) and the impeller (110), wherein at least one flushing outlet (135) is formed in the impeller (110), wherein the flushing outlet (135) is designed to discharge the flushing fluid flow (130) from the intermediate space (125) by means of centrifugal force when the cardiac support system (200) is in operation.

[0093] Clause 2. Sliding bearing device (100) according to clause 1, wherein a plurality of flushing outlets (135) are formed in the impeller (110).

[0094] Clause 3. Sliding bearing device (100) according to any one of the preceding clauses, wherein the at least one flushing outlet (135) is inclined relative to a longitudinal axis of the impeller (110).

[0095] Clause 4. Sliding bearing device (100) according to any one of the preceding clauses, wherein the flushing outlet (135) is configured as a tube having a discharge opening (140).

[0096] Clause 5. Sliding bearing device (100) according to clause 4, wherein the discharge opening (140) is disposed in a jacket section (505) of the impeller (110) enclosing the subsection (120) of the stand unit (105) or in a transition section (510) between a region of a propeller (515) of the impeller (110) and the jacket section (150).

[0097] Clause 6. Sliding bearing device (100) according to clause 5, wherein the impeller (110) comprises a plurality of flushing outlets (135), wherein the discharge openings (140) of the flushing outlets (135) are at least partially disposed in the transition section (510).

[0098] Clause 7. Sliding bearing device (100) according to any one of the preceding clauses, wherein a number of the flushing outlets (135) in the impeller (110) corresponds to a multiple of the number of blades of the impeller (110).

[0099] Clause 8. Sliding bearing device (100) according to any one of the preceding clauses, comprising a flushing inlet (145) for introducing the flushing fluid flow (130), wherein, in the assembled state of the sliding bearing device (100), the flushing inlet (145) opens into the intermediate space (125).

[0100] Clause 9. Sliding bearing device (100) according to clause 8, wherein the flushing inlet (145) is formed as a gap (905) between a base of the stand unit (105) and a jacket section (150) of the impeller (110) enclosing the subsection (120) of the stand unit (105), and/or wherein the flushing inlet (145) is formed in the impeller (110) as an inclined inlet channel (1105) or by a plurality of inlet channels having at least one inclined inlet channel (1105).

[0101] Clause 10. Sliding bearing device (100) according to any one of clauses 8 to 9, wherein the flushing inlet (145) is disposed downstream with respect to the flushing outlet (135) in the flow direction of the pump fluid flow (115).

[0102] Clause 11. Cardiac support system (200) comprising a sliding bearing device (100) according to any one of the preceding clauses 1 to 10.

[0103] Clause 12. Method (800) for producing a sliding bearing device (100) for a cardiac support system (200), wherein the method (800) comprises the following steps: [0104] providing (801) a stand unit (105), which is designed to support an impeller (110) such [0105] that it can rotate, and the impeller (110), which is configured to rotate during operation of the cardiac support system (200) to convey a pump fluid flow (115); [0106] forming (803) at least one flushing outlet (135) in the impeller (110), wherein the flushing outlet (135) is designed to discharge a flushing fluid flow (130) from the sliding bearing device (100) by means of centrifugal force when the cardiac support system (200) is in operation; and [0107] assembling (805) the impeller (110) and the stand unit (105) to produce the sliding bearing device (100), wherein at least one subsection (120) of the stand unit (105) is enclosed by the impeller (110), and wherein an intermediate space (125) for guiding the flushing fluid flow (130) is disposed between the subsection (120) and the impeller (110).

LIST OF REFERENCE SIGNS

[0108] 100 Sliding bearing device [0109] 105 Stand unit [0110] 107 Base [0111] 110 Impeller [0112] 111 Region of a propeller of the impeller [0113] 112 Axis of rotation [0114] 114 Longitudinal axis [0115] 115 Pump fluid flow [0116] 116 Longitudinal extension axis [0117] 120 Subsection of the stand unit [0118] 125 Intermediate space [0119] 130 Flushing fluid flow [0120] 132 Opening cross-section [0121] 134 Opening cross-section normal vector [0122] 135 Flushing outlet [0123] 136 Directional component [0124] 137 Axis [0125] 140 Discharge opening [0126] 145 Flushing inlet [0127] 150 Jacket section [0128] 155 Block [0129] 200 Cardiac support system [0130] 205 Housing section [0131] 210 Inlet hose [0132] 215 Discharge opening [0133] 220 Connection section [0134] 225 Web [0135] 405 Ball bearing [0136] 505 Jacket section [0137] 510 Transition section [0138] 515 Propeller [0139] 520, 525, 530 Region [0140] 605, 610, 615, 620, 625 Configuration [0141] 800 Method [0142] 801 Step of providing [0143] 803 Step of forming [0144] 805 Step of assembling [0145] 905 Gap [0146] 1005 Arrow [0147] 1105, 1107 Inlet channel