Catheter pump arrangement and flexible shaft arrangement having a core

Patent metadata

Field	Value
Publication number	US-12313113-B2
Application number	US-202017011469-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Oct 23, 2009
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

A flexible shaft arrangement is described herein having a flexible hollow shaft ( 1, 2 ) which has an end at the drive side and an end at the output side, wherein the hollow shaft is reinforced sectionally between these ends by a core ( 3, 4 ) extending in its interior. Stiffer and more flexible sections can hereby be selectively positioned within the shaft arrangement.

First claim

The invention claimed is:

1. A flexible drive shaft arrangement comprising:
a drive shaft having a proximal end and a distal end, the drive shaft formed with a hollow lumen,
wherein the drive shaft comprises:
a first portion having a first bending stiffness,
a second portion having a second bending stiffness,
a third portion having a third bending stiffness, and
a fourth portion having a fourth bending stiffness,

wherein the second portion is disposed between the first portion and the third portion and the third portion is disposed between the second portion and the fourth portion, and
wherein the first bending stiffness and the third bending stiffness are each greater than the second bending stiffness and the fourth bending stiffness such that, for a given bending strain, the first portion and the third portion of the drive shaft have a greater bending radius than the second portion and the fourth portion of the drive shaft.

2. The flexible drive shaft arrangement of claim 1 , further comprising a first core disposed within the hollow lumen along the first portion of the drive shaft and a second core disposed within the hollow lumen along the third portion of the drive shaft, wherein, along the second portion and the fourth portion of the drive shaft, the hollow lumen does not include a core.

3. The flexible drive shaft arrangement of claim 2 , wherein the first core reinforces the first portion of the drive shaft such that the first portion has the first bending stiffness, and the second core reinforces the third portion of the drive shaft such that the third portion has the third bending stiffness.

4. The flexible drive shaft arrangement of claim 2 , wherein the first core and the second core are configured to rotate with the drive shaft.

5. The flexible drive shaft arrangement of claim 2 , wherein the first core and the second core are fastened within the hollow lumen.

6. The flexible drive shaft arrangement of claim 5 , wherein the first core and the second core are welded or soldered to the interior of the hollow lumen.

7. The flexible drive shaft arrangement of claim 2 , wherein the first core and the second core comprise a solid body or a stranded body.

8. The flexible drive shaft arrangement of claim 7 , wherein each of the first core and the second core comprises a solid body, the solid body comprises a metal body or a plastic body.

9. The flexible drive shaft arrangement of claim 7 , wherein each of the first core and the second core comprises a stranded body, the stranded body comprises a plurality of strand elements.

10. The flexible drive shaft arrangement of claim 9 , wherein the strand elements are formed by wires.

11. The flexible drive shaft arrangement of claim 1 , wherein the drive shaft comprises at least one wound helical spring.

12. The flexible drive shaft arrangement of claim 1 , wherein the drive shaft has a constant diameter from the proximal end to the distal end.

Assignees

• Ecp Entw Mbh

Inventors

• Roehn Daniel
• Liebing Reiner

Classifications

• F16C1/26

  Construction of guiding-sheathings or guiding-tubes · CPC title

• A61M60/216

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

• A61M60/408

  the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable · CPC title

• A61M60/857

  Implantable blood tubes · CPC title

• A61M60/148

  in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices · CPC title