Blood pump

Patent metadata

Field	Value
Publication number	US-9364594-B2
Application number	US-201214115460-A
Country	US
Kind code	B2
Filing date	May 4, 2012
Priority date	May 5, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A blood pump having an axially tubular inlet, a tangential chamber adjoining the axial inlet and having a substantially radial outlet, with an axial guide body connected to the outlet and/or to the tangential chamber, an impeller supported on the guide body and having an inner surface facing the guide body and an outer surface as well as blading arranged on the outer surface. At least one part region of the guide body projects from the tangential chamber into the inlet, wherein at least one section of the stator transmitting a force onto the rotor is arranged in the part region. The impeller is supported by a hydrodynamic radial bearing in the radial direction.

First claim

The invention claimed is:

1. A blood pump comprising
an axial tubular inlet having a cylindrical cross-section;
a tangential chamber adjoining the axial inlet and having a substantially radially directed outlet;
an axial guide body connected to at least one of the inlet or the tangential chamber;
an impeller supported on the guide body and having an inner surface facing the guide body and an outer surface;
blading arranged on the outer surface of the impeller, wherein at least a portion of the blading is in the cylindrical cross-section; and
a motor which includes a stator associated with the guide body and a rotor associated with the impeller, the stator comprising a coil configured to transmit force onto the rotor,
wherein a part region of the guide body includes the coil and projects from the tangential chamber into the cylindrical cross-section of the inlet, wherein a section of the coil is in the cylindrical cross-section of the axial tubular inlet and the impeller is supported by a hydrodynamic radial bearing in the radial direction.

2. A blood pump in accordance with claim 1 , wherein the impeller is supported in the radial direction only by a hydrodynamic radial bearing formed between the inner surface of the impeller and the guide body outer surface.

3. A blood pump in accordance with claim 1 , wherein the stator is arranged in a hollow space of the guide body.

4. A blood pump in accordance with claim 1 , wherein the guide body is connected to a wall of the tangential chamber.

5. A blood pump in accordance with claim 1 , wherein the coil includes windings and a ferrite core.

6. A blood pump in accordance with claim 1 , wherein the impeller is made in cylinder jacket form in the part section.

7. A blood pump in accordance with claim 1 , wherein the impeller includes a hollow space and the rotor is arranged in the hollow space.

8. A blood pump in accordance with claim 1 , wherein the rotor includes at least one alternatingly magnetized segmented permanent magnet ring.

9. A blood pump in accordance with claim 8 , wherein the permanent magnet ring is present as a one-piece ring magnet or is composed of respective individually magnetized part segments.

10. A blood pump in accordance with claim 1 , wherein the impeller is arranged such that the blading is arranged both in the tangential chamber and in the inlet.

11. A blood pump in accordance with claim 10 , wherein the blading includes a helix arranged on the outer surface.

12. A blood pump in accordance with claim 1 , wherein at least one of: the inner surface of the impeller is a cylindrical inner surface, or the outer surface of the impeller is a cylindrical running surface.

13. A blood pump in accordance with claim 1 , wherein the hydrodynamic radial bearing is formed by cut-outs on at least one of: the guide body outer surface or the inner surface of the impeller.

14. A blood pump in accordance with claim 1 , wherein the hydrodynamic radial bearing includes two or more pairs of inner surface sections of the impeller and respective guide body outer surface sections corresponding thereto.

15. A blood pump in accordance with claim 1 , wherein the impeller and the guide body are designed such that at least one of: the impeller is axially supported in an axial direction by the correspondingly configured motor, or the impeller is axially supported by permanent magnet systems not belonging to the motor.

16. A blood pump in accordance with claim 1 , wherein the axial tubular inlet is not formed in one part with the tangential chamber.

17. A blood pump in accordance with claim 1 , wherein the outlet is offset by an angle of more than 30° with respect to the inlet.

18. A blood pump in accordance with claim 1 , wherein at least a majority of the blading is in the cylindrical cross-section.

19. A blood pump in accordance with claim 1 , wherein the section of the coil in the cylindrical cross-section includes all of the coil.

20. A blood pump in accordance with claim 1 , wherein the tangential chamber joins the axial inlet at an angle of 90°.

21. A blood pump in accordance with claim 1 , wherein at least 40 percent of the part region of the guide body is in the cylindrical cross-section.

22. A blood pump comprising:
an axially tubular inlet having a cylinder-shaped elongated section;
a tangential chamber adjoining the axial inlet and having a substantially radial outlet;
an axial guide body connected to at least one of the axially tubular inlet or the tangential chamber, wherein the axial guide body projects into the axially tubular inlet;
an impeller supported on the guide body and having an inner surface facing the guide body and an outer surface; and
a motor which includes a coil associated with the guide body and a rotor associated with the impeller, wherein the coil is configured to transmit force onto the rotor and cause blading on the impeller to rotate inside of the cylinder-shaped elongated section of the inlet, and
wherein a section of the coil is located in the cylinder-shaped elongated section of the inlet.

23. A blood pump comprising:
an axially tubular inlet with an elongated section of a substantially constant diameter;
a tangential chamber adjoining the axial inlet and having a substantially radial outlet;
an axial guide body connected to at least one of the tube or the tangential chamber, wherein a portion of the axial guide body is in the elongated section of the axial inlet having the substantially constant diameter;
an impeller supported on the guide body and having an inner surface facing the guide body and an outer surface; and
a motor which includes a coil associated with the guide body and a rotor associated with the impeller, wherein the coil is configured to cause blading on the impeller to rotate inside of the elongated section of the axial inlet having the substantially constant diameter, wherein a section of the coil is located is in the elongated section of the axial inlet having the substantially constant diameter,
wherein the guide body includes a cylindrical guide body outer surface in the part region and the impeller is made in cylinder sleeve form in the part section.

Assignees

• Nüsser Peter
• Konstas Georg
• Berlin Heart Gmbh

Inventors

• Nüsser Peter
• Konstas Georg

Classifications

• A61M60/242

  with the outlet substantially perpendicular to the axis of rotation · CPC title

• A61M60/82

  Magnetic bearings · CPC title

• A61M60/824

  Hydrodynamic or fluid film bearings · CPC title

• A61M60/178 Primary

  drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices · CPC title

• A61M1/1017

  Human Necessities · mapped topic