Fluid pump with a rotor

• US 10,662,967 B2
• Filed: 04/09/2018
• Issued: 05/26/2020
• Est. Priority Date: 12/05/2008
• Status: Active Grant

• Current Assignee: ECP Entwicklungsgesellschaft mbH (Johnson & Johnson)
• Original Assignee: ECP Entwicklungsgesellschaft mbH (Johnson & Johnson)
• Inventors: Scheckel, Mario
• Primary Examiner(s): Tejani, Ankit D
• Application Number:
  US15/948,512
• Publication Number:
  US 20180291918A1
• Time in Patent Office: 778 Days
• Field of Search: None
• 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 60/135 inside a blood vessel, e.g. using grafting
• 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 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/237 the blood flow through the rotating member having mainly axial components, e.g. axial 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: B63H 1/14 Propellers pitch changing B63H3/00
• CPC Class Codes: B63H 2001/122 Single or multiple threaded helicoidal screws, or the like, comprising foils extending over a substantial angle; Archimedean screws
• CPC Class Codes: F04D 29/026 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/18 Rotors specially for elastic fluids F04D29/26
• CPC Class Codes: F04D 29/247 elastic or self-adjusting
• CPC Class Codes: F04D 29/605 specially adapted for liquid pumps
• CPC Class Codes: F05D 2230/50 Building or constructing in particular ways
• CPC Class Codes: F05D 2300/501 Elasticity
• CPC Class Codes: F05D 2300/505 Shape memory behaviour
• CPC Class Codes: F05D 2300/518 Ductility
• CPC Class Codes: Y10T 29/49229 Prime mover or fluid pump making
• CPC Class Codes: Y10T 29/49245 Vane type or other rotary, e.g., fan

Abstract

The invention relates to a fluid pump, in particular to a liquid pump having a rotor with at last one rotor blade for conveying the fluid, the rotor being variable with respect to its diameter between a first, compressed state and a second expanded state. In order to produce a simple compressibility and expandability of the rotor of the pump, it is provided according to the invention that at least one rotor blade is deformable between a first state which it assumes in the compressed state of the rotor and a second state which it assumes in the expanded state of the rotor by means of a fluid counterpressure during a rotation of the rotor during pump operation.

Claims

1. A percutaneous pump, comprising:

an expandable and compressible housing having a first inner diameter when compressed and a second inner diameter when expanded;

a rotor disposed within the housing, the rotor having a compressed state, a first expanded state, and a second expanded state;

the rotor comprising;

a hub; and

a helical rotor blade coupled to the hub and configured to convey fluid, wherein the helical rotor blade spans at least 180 degrees about the hub;

wherein the helical rotor blade is configured to increase in diameter between the compressed state and the first expanded state to a first expanded diameter in the first expanded state, and to further increase between the first expanded diameter in the first expanded state to a second expanded diameter in the second expanded state, said increase to the second expanded diameter due at least in part to fluid counterpressure on the helical rotor blade;

wherein the helical rotor blade is configured to increase in diameter from the compressed state to the first expanded state due at least in part to expansion of the housing from the first inner diameter to the second inner diameter; and

wherein the rotor is configured to expand from the compressed state to the first expanded state and to the second expanded state within the expanded housing, and wherein a first difference between the second inner diameter of the housing and the first expanded diameter of the helical rotor blade is greater than a second difference between the second inner diameter of the housing and the second expanded diameter of the helical rotor blade.

2. The percutaneous pump of claim 1, wherein the helical rotor blade comprises a leading side of the blade and a trailing side of the blade, wherein the fluid counterpressure acts against the leading side of the blade.

3. The percutaneous pump of claim 2, wherein the helical rotor blade comprises a winglet at a distal tip of the blade.

4. The percutaneous pump of claim 3, wherein the winglet is configured to abut an inner wall of the housing when the helical rotor blade is in the second expanded state.

5. The percutaneous pump of claim 4, wherein the winglet is configured to glide against the inner wall of the housing during operation of the rotor.

6. The percutaneous pump of claim 4, wherein the winglet is pivotable with regard to the blade.

7. The percutaneous pump of claim 6, wherein the winglet is configured to be pivoted into an operating position by fluid pressure during rotation of the rotor.

8. The percutaneous pump of claim 7, wherein the winglet is provided on the leading side of the blade.

9. The percutaneous pump of claim 7, wherein the winglet is provided on the trailing side of the blade.

10. The percutaneous pump of claim 7, wherein the winglet protrudes from both the leading side and the trailing side of the blade.

11. The percutaneous pump of claim 1, wherein the housing is rounded at distal end.

12. The percutaneous pump of claim 1, wherein the percutaneous pump is located at a distal end of a drive shaft, and the percutaneous pump is driven by an external motor connected to a proximal end of the drive shaft.

13. The percutaneous pump of claim 12, wherein the drive shaft is flexible and is configured to extend over an aortic arch.

14. The percutaneous pump of claim 12, wherein the housing comprises a shape memory material.

15. The percutaneous pump of claim 12, wherein the housing is configured to be radially expanded by application of a force in a proximal direction along a longitudinal axis of the housing.

16. The percutaneous pump of claim 15, wherein the force in the proximal direction is applied to the drive shaft relative to the housing to expand the housing to the second inner diameter.

17. The percutaneous pump of claim 1, wherein the housing further comprises slots configured to allow a fluid to flow into an interior of the housing.

18. The percutaneous pump of claim 1, wherein a diameter of the rotor in the compressed state is less than the first inner diameter of the housing when compressed.

19. The percutaneous pump of claim 1, wherein the rotor includes multiple helical rotor blades.

20. The percutaneous pump of claim 1, wherein the helical rotor blade is pivotable about a line on the surface of the hub.

21. The percutaneous pump of claim 1, wherein the housing surrounds the helical rotor blade in the compressed state and in the first expanded state.

22. The percutaneous pump of claim 1, wherein the housing is not longitudinally movable with respect to the helical rotor blade.

23. The percutaneous pump of claim 1, further comprising a sheath surrounding the housing and movable with respect to the housing.

24. The percutaneous pump of claim 1, wherein a distance from the distal end of the housing to a distal end of the helical rotor blade is the same when the housing is compressed as when the housing is expanded.