Blood pump

Patent metadata

Field	Value
Publication number	US-2016243294-A1
Application number	US-201615063080-A
Country	US
Kind code	A1
Filing date	Mar 7, 2016
Priority date	May 5, 2011
Publication date	Aug 25, 2016
Grant date	—

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 stabilised 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

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, 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, and a cross-sectional area of the discharge channel enlargens from a beginning of the discharge channel towards the outlet.

2 . A blood pump according to claim 1 , wherein the cross-sectional area widens in at least one of the direction of the rotation axis and a direction radial to the rotation axis.

3 . A blood pump according to claim 1 , wherein the cross-sectional area is a cross-sectional area of an inner lumen of the discharge channel.

4 . A blood pump according to claim 1 , wherein the impeller includes a blading extending along the hollow cylinder.

5 . 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 at least one actuator ring coil for actively stabilising the impeller in axial direction.

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

7 . A blood pump of claim 6 , 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.

8 . 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.

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

10 . 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.

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

12 . 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.

13 . 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.

14 . 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.

15 . 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.

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

17 . 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.

Assignees

• Berlin Heart Gmbh

Inventors

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

Classifications

• A61M1/1015

  Human Necessities · mapped topic

• A61M1/122

  Human Necessities · mapped topic

• A61M1/1017

  Human Necessities · mapped topic

• A61M1/101 Primary

  Human Necessities · mapped topic

• A61M60/824 Primary

  Hydrodynamic or fluid film bearings · CPC title