Blood pump

Patent metadata

Field	Value
Publication number	US-9308304-B2
Application number	US-201114115425-A
Country	US
Kind code	B2
Filing date	May 5, 2011
Priority date	May 5, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A blood pump includes a hollow body in which an impeller with blading is provided for producing an axial propulsion of blood along the impeller. An at least partly actively stabilized magnetic bearing device is provided wherein the impeller may be set into a rotation about a rotation axis of the impeller, with a motor stator. The hollow body has an inlet for the flow of blood into the hollow body in an inflow direction which is essentially parallel to the rotation axis, and an outlet for the outflow of the blood out of the hollow body in an outflow direction.

First claim

The invention claimed is:

1. A blood pump, comprising a hollow body, in which an impeller with a blading is provided for producing an axial propulsion of the blood along the impeller, wherein the impeller is configured to be set into a rotation about a rotation axis of the impeller with a motor stator located outside the hollow body, and wherein the hollow body comprises a hollow cylinder and an inlet for the flow of blood into the hollow cylinder in an inflow direction which is essentially parallel to the rotation axis, and an outlet for the outflow of the blood out of the hollow cylinder in an outflow direction, wherein the outlet is arranged offset to the rotation axis of the impeller, for producing an outflow angle between the inflow direction and the outflow direction, said angle being different from zero, wherein, at an outlet-side end of the hollow cylinder, an inner radius of the hollow body is enlarged and forms a discharge channel which runs tangentially around an outlet-side end portion of the impeller and runs out into the outlet, for a flowing-away of the blood out of the hollow body, running essentially tangentially to the outlet-side end portion of the impeller, wherein the blading of the impeller is designed as a helix which extends along the hollow cylinder.

2. A blood pump according to claim 1 , wherein on an upstream-side or a downstream-side of the impeller permanent magnet arrangements are provided and the pump has only one actuator ring coil for actively stabilising the impeller in axial direction.

3. A blood pump according to claim 2 , wherein the only one actuator ring coil acts on both the upstream-side and the downstream-side permanent magnet arrangements by using an iron yoke for transferring the magnetic flux to at least one of the permanent magnet arrangements.

4. A blood pump according to claim 2 , wherein the only one actuator coil acts on only a first of the upstream-side or downstream-side permanent magnet arrangements and the other permanent magnet arrangement is configured as a passive axial bearing.

5. A blood pump according to claim 4 , wherein the passive axial bearing arrangement comprises two magnets which attract each other.

6. A blood pump according to claim 2 , wherein only one or both of the upstream-side and downstream-side permanent magnet arrangements of the impeller comprises a sensor system for detecting a possible deviation of the impeller from a desired axial position.

7. A blood pump according to claim 6 , wherein the at least one sensor system interacts with the only one actuator ring coil for correcting a possible deviation of the impeller from the desired axial position.

8. A blood pump according to claim 1 , wherein a hydrodynamic bearing device for the impeller is given.

9. A blood pump of claim 8 , wherein the hydrodynamic bearing device of the impeller is designed as a support ring which is connected to the impeller, for forming an annular gap between the support ring and an inner wall of the hollow body, for a radial bearing of the impeller.

10. A blood pump according to claim 1 , wherein the outlet of the hollow body is arranged between an upstream-side of the impeller, said upstream-side facing the inlet, and a downstream-side of the impeller, said downstream-side being away from the inlet.

11. A blood pump according to one claim 1 , wherein a centre of the discharge channel offsets away from the impeller in a direction axial to the rotation axis of the impeller.

12. A blood pump according to claim 1 , wherein the discharge channel widens towards the outlet.

13. A blood pump according to claim 1 , wherein the discharge channel widens in a direction axial to the rotation axis of the impeller and/or radial to the rotation axis of the impeller.

14. A blood pump according to claim 1 further comprising a magnetic bearing device that has an actively stabilised axial bearing.

15. A blood pump according to claim 14 , wherein the magnetic bearing device is partly integrated into an inlet guide vane.

16. A blood pump according to claim 1 , wherein the impeller comprises a peripheral surface, wherein said peripheral surface carries the blading and is designed in an essentially cylinder-shaped manner, cone-shaped manner or truncated-cone-shaped manner.

17. A blood pump according to claim 1 , wherein a pitch of the blading lies in a range between 2 mm and 20 mm along an entire axial extent of the blading.

18. A blood pump according to claim 1 , wherein a pitch of the blading at a upstream-side of the impeller lies in a range between 2 mm and 8 mm and a pitch of the blading at a downstream-side of the impeller lies in a range between 10 mm and 20 mm.

19. A blood pump according to claim 1 , wherein the blading comprises at least one spiral-shaped blade which is wound at least once around the impeller.

20. A blood pump according to claim 1 , wherein a maximal height of the blading is less than 50% of a maximal total radius of the impeller.

21. A blood pump according to claim 1 , wherein a maximal width of the blading is less than 10% of a maximal total circumference of the impeller.

22. A blood pump according to claim 1 , wherein the blading is spread over at least 80% of an axial length of the impeller.

23. A blood pump according to claim 1 , wherein the impeller has a maximal total diameter which is not larger than 60% of the total axial extent of the blading of the impeller.

24. A blood pump according to claim 1 , wherein an inlet guide vane is provided.

25. A blood pump according to claim 1 , wherein a fluid channel in the area of the discharge channel is split into at least two partial fluid channels.

26. A total artificial heart comprising two blood pumps, each blood pump comprising a hollow body, in which an impeller with a blading is provided for producing an axial propulsion of the blood along the impeller, wherein the impeller is configured to be set into a rotation about a rotation axis of the impeller, with a motor stator located outside the hollow body, and wherein the hollow body comprises a hollow cylinder and an inlet for the flow of blood into the hollow cylinder in an inflow direction which is essentially parallel to the rotation axis, and an outlet for the outflow of the blood out of the hollow cylinder in an outflow direction, wherein the outlet is arranged offset to the rotation axis of the impeller, for producing an outflow angle between the inflow direction and the outflow direction, said angle being different from zero, wherein, at an outlet-side end of the hollow cylinder, an inner radius of the hollow body is enlarged and forms a discharge channel which runs tangentially around an outlet-side end portion of the impeller and runs out into the outlet, for a flowing-away of the blood out of the hollow body, running essentially tangentially to the outlet-side end portion of the impeller, wherein the blading of the impeller is designed as a helix which extends along the hollow cylinder.

27. A total artificial heart from claim 26 , wherein the impellers of the two blood pumps ( 1 ) are arranged on a common rotation axis.

28. A total artificial heart from one of the claim 26 or 27 , wherein the orientations of axial propulsion of the two blood pumps are anti-parallel and directed towards each other.

Assignees

• Peters Hans-Erhard
• Müller Jörg
• Graichen Kurt
• Nüsser Peter
• Göllner Manfred
• Arndt Andreas
• Choub Leonid
• Berlin Heart Gmbh

Inventors

• Peters Hans-Erhard
• Müller Jörg
• Graichen Kurt
• Nüsser Peter
• Göllner Manfred
• Arndt Andreas
• Choub Leonid

Classifications

• A61M1/122 Primary

  Human Necessities · mapped topic

• A61M1/101

  Human Necessities · mapped topic

• A61M1/1017

  Human Necessities · mapped topic

• A61M1/1015

  Human Necessities · mapped topic

• A61M60/824 Primary

  Hydrodynamic or fluid film bearings · CPC title