Intravascular blood pump with intake filter

Patent metadata

Field	Value
Publication number	US-12263330-B2
Application number	US-202318211345-A
Country	US
Kind code	B2
Filing date	Jun 19, 2023
Priority date	Feb 4, 2020
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

An intravascular blood pump has an intake filter that reduces risk of heart tissue being sucked into an intake port of the pump. The filter defines a plurality of apertures, through which blood flows through the filter. The apertures are sized to prevent ingestion, by the input port, of the heart tissue. The filter includes a plurality of generally helical first struts wound about a longitudinal axis of the filter, and a plurality of second struts. The first and second struts collectively define the plurality of apertures therebetween. The struts may be woven filaments, or the apertures may be defined in a thin film (foil) tube, where remaining material between the apertures form the struts.

First claim

What is claimed is:

1. An intravascular blood pump, comprising:
a catheter configured for insertion into a blood vessel, the blood vessel defining an interior volume, through which blood flows;
a pump housing attached to the catheter and defining an input port and an output port, the pump housing having a longitudinal axis;
an impeller disposed within the pump housing and configured, when rotated, to pump blood from the input port to the output port; and
a filter configured to be mounted over an exterior of the pump housing, wherein the filter is in fluid communication between: (a) the interior volume of the blood vessel, external to the pump housing, and (b) the input port, the filter comprising a plurality of generally helical first struts wound about the longitudinal axis and a plurality of second struts, the plurality of generally helical first struts and the plurality of second struts collectively defining a plurality of apertures therebetween,
wherein the filter comprises a tube having a wall, wherein the plurality of apertures comprises a plurality of openings defined through the wall, and
wherein the filter comprises a distal filter portion and a proximal filter portion.

2. The intravascular blood pump according to claim 1 , wherein the pump housing, the impeller and the filter are each alternatingly radially compressible and radially expandable.

3. The intravascular blood pump according to claim 2 , wherein the pump housing is configured, when radially compressed, to longitudinally lengthen an amount that depends on an amount by which the pump housing is radially compressed, and the filter is configured, when radially compressed, to longitudinally lengthen an amount that depends on an amount by which the filter is radially compressed such that, for a given amount of radial compression, the filter and the pump housing longitudinally lengthen about equal amounts.

4. The intravascular blood pump according to claim 1 , wherein the catheter, the pump housing, the impeller and the filter are configured for use in a living patient, such that each aperture of the plurality of apertures is sized to prevent ingestion, by the input port, of heart tissue of the living patient.

5. The intravascular blood pump according to claim 1 , wherein each aperture of the plurality of apertures has a largest dimension less than or equal to about 0.5 mm or about 0.4 mm.

6. The intravascular blood pump according to claim 1 , wherein each aperture of the plurality of apertures has an area less than or equal to about 0.09 mm 2 or about 0.16 mm 2 .

7. The intravascular blood pump according to claim 1 , wherein the plurality of apertures have a size that increases monotonically along the longitudinal axis.

8. The intravascular blood pump according to claim 1 , wherein the plurality of generally helical first struts are wound clockwise about the longitudinal axis, and the plurality of second struts are generally helically wound counterclockwise about the longitudinal axis.

9. The intravascular blood pump according to claim 1 , wherein the plurality of generally helical first struts are wound in a first direction about the longitudinal axis, and the plurality of second struts are generally helically wound in the first direction about the longitudinal axis.

10. The intravascular blood pump according to claim 1 , wherein each aperture of at least a subset of the plurality of apertures has a general rhombus or rhomboid shape.

11. The intravascular blood pump according to claim 1 , wherein the plurality of generally helical first struts comprise a plurality of first filaments, the plurality of second struts comprise a plurality of second filaments and the plurality of first filaments and the plurality of second filaments are woven together, such that the plurality of apertures is defined between respective adjacent plurality of first filaments and plurality of second filaments.

12. The intravascular blood pump according to claim 1 , wherein the tube comprises a generally funnel-shaped tube.

13. The intravascular blood pump according to claim 1 , wherein the wall is about 10-100 μm thick.

14. The intravascular blood pump according to claim 1 , wherein the pump housing comprises a plurality of third struts that collectively define a plurality of third apertures therebetween, and at least some of the plurality of generally helical first struts and the plurality of second struts register radially over respective ones of the plurality of third struts.

15. The intravascular blood pump according to claim 1 , wherein each strut of at least a subset of the plurality of generally helical first struts comprises a fork that includes a plurality of tines, wherein the at least a subset of the plurality of generally helical first struts and the at least a subset of the plurality of second struts extend between a pair of the tines and collectively define a plurality of the apertures therebetween.

16. The intravascular blood pump according to claim 15 , wherein each strut of at least a subset of the plurality of generally helical first struts that comprises a fork is wider than each of the plurality of generally helical first struts that does not comprise a fork.

17. The intravascular blood pump according to claim 1 , wherein the plurality of apertures are arranged in a plurality of generally circumferential rows of equal-sized apertures, relative to the longitudinal axis, wherein ones of the plurality of generally circumferential rows have different numbers of apertures from others of the plurality of generally circumferential rows.

18. The intravascular blood pump according to claim 17 , wherein a first row of the plurality of generally circumferential rows comprises more apertures than a second row of the plurality of generally circumferential rows, and each aperture of the first row of the plurality of generally circumferential rows has a smaller area than each aperture of the second row of the plurality of generally circumferential rows.

19. The intravascular blood pump according to claim 1 , wherein the apertures are arranged in a plurality of generally circumferential bands of about equal-sized apertures, relative to the longitudinal axis, wherein size of the apertures in each of the plurality of generally circumferential bands increases monotonically along the longitudinal axis.

20. The intravascular blood pump according to claim 19 , wherein the distal filter portion monotonically increases in diameter in a proximal direction along the longitudinal axis, the proximal filter portion monotonically decreases in diameter in the proximal direction along the longitudinal axis and at least a portion of the plurality of apertures is disposed on the distal filter portion.

Assignees

• Abiomed Inc

Inventors

• D'Ambrosio Ralph Louis
• Daschewski Maxim
• Neblik Valentin
• Schumacher Joerg
• Spanier Gerd

Classifications

• A61M60/81

  Pump housings · CPC title

• A61M60/216

  including a rotating member acting on the blood, e.g. impeller · CPC title

• A61M2205/04

  implanted · CPC title

• A61M60/808

  specially adapted for deformable impellers, e.g. expandable impellers · CPC title

• A61M60/135 Primary

  inside a blood vessel, e.g. using grafting · CPC title