Foldable Intravascularly Inserted Blood Pump

• US 20080103591A1
• Filed: 09/26/2005
• Published: 05/01/2008
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: ABIOMED Europe GmbH (Johnson & Johnson)
• Original Assignee: ABIOMED Europe GmbH (Johnson & Johnson)
• Inventors: Siess, Thorsten
• Granted Patent: US 8,814,933 B2
• Time in Patent Office: Days
• US Class Current: 623/3.13
• CPC Class Codes: A61M 60/13 by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/221 the blood flow through the rotating member having both radial and axial components, e.g. mixed flow pumps
• CPC Class Codes: A61M 60/414 transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
• CPC Class Codes: A61M 60/422 the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
• CPC Class Codes: A61M 60/808 specially adapted for deformable impellers, e.g. expandable impellers
• CPC Class Codes: A61M 60/818 Bearings
• CPC Class Codes: A61M 60/857 Implantable blood tubes

Abstract

A foldable intravascularly insertable blood pump comprises a rotatable impeller provided with vanes, a flexible shaft extending through a catheter and adapted to drive said impeller, and an envelope enclosing said impeller. For simplifying the technical setup of the blood pump and enhancing its robustness, the impeller comprises radially delivering vanes. The envelope comprises an annular bulge in the region of the impeller, wherein between the radially outer ends of the vanes and the envelope an annular deflection channel is defined. The impeller and the envelope are adapted to be folded by relative displacement of the shaft and the catheter.

Claims

1. A foldable intravascularly insertable blood pump comprising a rotor provided with vanes, a flexible shaft extending through a catheter and adapted to drive the impeller, and an envelope enclosing said impeller, wherein the rotor is a radially delivering impeller, and the envelope comprises an annular bulge in the region of said impeller, wherein between the radially outer ends of the vanes and the enclosure an annular deflection channel is defined which deflects the radial flow in axial direction.

2. The blood pump according to claim 1, wherein the impeller and the envelope are adapted to be folded by relative displacement of the shaft and the catheter.

3. The blood pump according to claim 1, wherein the impeller comprises two essentially parallel supporting walls between which flexible sails are configured as vanes.

4. The blood pump according to claim 3, wherein at least one of the supporting walls comprises spokes.

5. The blood pump according to claim 3, wherein one supporting wall is a continuous wall and the other supporting wall comprises an opening enclosing the shaft.

6. The blood pump according to claim 3, wherein the supporting walls are fastened to the shaft by a hinge.

7. The blood pump according to claim 3, wherein both supporting walls comprise spokes which are offset relative to each other.

8. The blood pump according to claim 3, wherein the two supporting walls are configured of congruent spokes.

9. The blood pump according to claim 1, wherein the envelope comprises a cylindrical extension at the end of which flow openings are provided.

10. The blood pump according to claim 1, wherein the envelope comprises a hub in which the shaft is supported in an axially non-displaceable manner.

11. The blood pump according to claim 1, wherein the shaft comprises a rigid portion at its front end, the impeller being fastened to said rigid portion.

12. The blood pump according to claim 1, wherein the envelope comprises a concentric planar wall which is arranged at a small distance to the impeller.

13. The blood pump according to claim 1, wherein the impeller is foldable axially to the shaft in two opposite directions.

14. The blood pump according to claim 1, wherein the envelope comprises, on one side of the impeller, a partition wall provided with a flow opening in the region of the deflection channel.