Heart assist device with expandable impeller pump

Patent metadata

Field	Value
Publication number	US-10864309-B2
Application number	US-201816181963-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Mar 23, 2006
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

An impeller includes a hub and a blade supported by the hub. The impeller has a stored configuration in which the blade is compressed so that its distal end moves towards the hub, and a deployed configuration in which the blade extends away from the hub. The impeller may be part of a pump for pumping fluids, such as blood, and may include a cannula having a proximal portion with a fixed diameter, and a distal portion with an expandable diameter. The impeller may reside in the expandable portion of the cannula. The cannula may have a compressed diameter which allows it to be inserted percutaneously into a patient. Once at a desired location, the expandable portion of the cannula may be expanded and the impeller expanded to the deployed configuration. A flexible drive shaft may extend through the cannula for rotationally driving the impeller within the patient.

First claim

What is claimed is:

1. A catheter pump comprising:
a cannula comprising:
a non-expandable portion;
an expandable portion extending between a proximal end and a distal end;
a nose grommet;
a plurality of inlet struts extending between the nose grommet and the expandable portion distal end; and
a plurality of discharge struts extending between the non-expandable portion and the expandable portion proximal end; and

an impeller disposed in the cannula, the impeller sized and shaped to be inserted into a heart of a patient, wherein the impeller is configured to move axially out of the non-expandable portion and into the expandable portion for deployment.

2. The catheter pump of claim 1 , wherein the plurality of inlet struts are configured to prevent obstructions from entering the cannula.

3. The catheter pump of claim 1 , wherein the plurality of discharge struts are configured to act as stationary stator blades and remove swirl velocity from a discharge flow of the impeller.

4. The catheter pump of claim 1 , wherein the plurality of discharge struts are flat linear elements.

5. The catheter pump of claim 1 , wherein the plurality of discharge struts have an airfoil cross-section.

6. The catheter pump of claim 1 , wherein the expandable portion of the cannula comprises a mesh including a hexagonal cell matrix.

7. The catheter pump of claim 1 , wherein the expandable portion of the cannula comprises a mesh including a plurality of circumferential rings connected by axial connectors.

8. The catheter pump of claim 7 , wherein the mesh and the plurality of discharge struts are formed from a single tube.

9. The catheter pump of claim 1 , wherein a geometric density of the expandable portion varies along a length of the expandable portion.

10. The catheter pump of claim 1 , wherein the expandable portion is formed from a nitinol tube.

11. A cannula for a catheter pump, the cannula comprising:
a non-expandable portion;
an expandable portion extending between a proximal end and a distal end;
a nose grommet;
a plurality of inlet struts extending between the nose grommet and the expandable portion distal end, the plurality of inlet struts configured to transition from a closed configuration to an expanded configuration, wherein in the closed configuration, the plurality of inlet struts are folded down and radially compressed; and
a plurality of discharge struts extending between the non-expandable portion and the expandable portion proximal end.

12. The cannula of claim 11 , wherein the plurality of inlet struts are configured to prevent obstructions from entering the cannula.

13. The cannula of claim 11 , wherein the plurality of discharge struts are configured to act as stationary stator blades and remove swirl velocity from a discharge flow of an impeller positioned within the cannula.

14. The cannula of claim 11 , wherein the plurality of discharge struts are flat linear elements.

15. The cannula of claim 11 , wherein the plurality of discharge struts have an airfoil cross-section.

16. The cannula of claim 11 , wherein the expandable portion of the cannula comprises a mesh including a hexagonal cell matrix.

17. The cannula of claim 11 , wherein the expandable portion of the cannula comprises a mesh including a plurality of circumferential rings connected by axial connectors.

18. The cannula of claim 17 , wherein the mesh and the plurality of discharge struts are formed from a single tube.

19. The cannula of claim 11 , wherein a geometric density of the expandable portion varies along a length of the expandable portion.

20. The cannula of claim 11 , wherein the expandable portion is formed from a nitinol tube.

Assignees

• Penn State Res Found
• Tc1 Llc
• Tci Llc

Inventors

• Mcbride Mark W
• Boger David A
• Campbell Robert L
• Dillon Gregory P
• Hambric Stephen A
• Kunz Robert F
• Leschinsky Boris
• Mallison Thomas M
• Runt James P
• Walsh Justin M

Classifications

• F04D3/00 Primary

  Axial-flow pumps (priming or boosting F04D9/00) · CPC title

• A61M60/865

  Devices for guiding or inserting pumps or pumping devices into the patient's body · CPC title

• A61M60/806

  Vanes or blades · CPC title

• A61M60/829

  having a purge fluid supply · CPC title

• A61M60/174

  discharging the blood to the ventricle or arterial system via a cannula internal to the ventricle or arterial system · CPC title