Drive shaft cover with a heat conducting part

Patent metadata

Field	Value
Publication number	US-11617876-B2
Application number	US-201816641169-A
Country	US
Kind code	B2
Filing date	Aug 22, 2018
Priority date	Aug 23, 2017
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

The application relates to a catheter device with a distal bearing for bearing a distal end of a drive shaft. The distal bearing comprises a heat conducting part for enabling heat transfer away from the distal bearing and/or a spiral sleeve for receiving the distant end of the drive shaft.

First claim

The invention claimed is:

1. A catheter device, comprising:
a rotor located at a distal end region of the catheter device;
a drive shaft extending from a driving region of the catheter device to the distal end region of the catheter device;
a distal bearing located at a distal end of the rotor for bearing a distal end of the drive shaft, the distal bearing comprising a spiral sleeve with a winding and configured for rotatably mounting the distal end of the drive shaft inside the spiral sleeve; and
wherein the distal bearing comprises a heat conducting part configured to enable heat transfer away from the distal bearing,
wherein the spiral sleeve with the winding is arranged within the distal bearing, such that a portion of the spiral sleeve and a portion of the heat conducting part are only separated by a thin flexible tube which is provided around a portion of an outside of the spiral sleeve.

2. The catheter device according to claim 1 , wherein the heat conducting part is designed as a tube surrounding the drive shaft.

3. The catheter device according to claim 1 , wherein the drive shaft further comprises:
a cavity extending axially with the drive shaft and wherein the drive shaft comprises a plurality of coaxial windings which run spirally around the cavity of the drive shaft, the windings within different coaxial layers having opposite winding directions and in that an outer diameter of the drive shaft lies in a range of about 0.4 mm to about 2 mm.

4. The catheter device according to claim 1 , wherein the heat conducting part extends out of the distal bearing and into an area which is configured to be brought in contact with a fluid, enabling heat transfer from the distal bearing to the fluid.

5. The catheter device according to claim 1 , wherein the distal bearing further comprises a polymer end part or the distal bearing comprises a polymer end part which comprises a region which is designed as a pigtail.

6. The catheter device according to claim 1 , wherein the heat conducting part is made of a medical grade stainless steel.

7. The catheter device according to claim 1 , wherein an inner diameter of the heat conducting part is between 0.5 mm and 2.6 mm or in that the heat conducting part has a thickness between 0.05 mm and 0.5 mm.

8. The catheter device according to claim 1 , wherein the spiral sleeve with the winding is arranged within the distal bearing, for rotatably mounting a distal end of the drive shaft inside the spiral sleeve, such that the spiral sleeve lies at least in part inside the heat conducting part designed as a tube or such that a portion of the spiral sleeve is in direct contact with a portion of an inner side of the heat conducting part.

9. The catheter device according to claim 8 , wherein the spiral sleeve is made of flat tape.

10. The catheter device according to claim 1 , wherein a portion of an outer side of the heat conducting part which is configured to be brought in contact with a fluid is smooth and in that an inner side of the heat conducting part is rough to facilitate gluing the spiral sleeve to the inner side of the heat conducting part.

11. The catheter device according to claim 10 , wherein a further portion of the outer side of the heat conducting part or tube, which is configured to lie inside a polymer end part, is roughened.

12. The catheter device according to claim 8 , wherein both ends of the spiral sleeve are face ground and all edges of both ends are rounded and smooth.

13. The catheter device according to claim 8 , wherein an inner diameter of the spiral sleeve is between 0.4 mm and 2.1 mm, and in that the spiral sleeve has a thickness between 0.05 mm to 0.4 mm.

14. The catheter device according to claim 8 , wherein the rotor and the drive shaft are configured to rotate in a rotating direction such that a flow of fluid in a proximal direction is effected, if the catheter device is brought in contact with a fluid, and further wherein, when looking along the drive shaft towards a distal end of the drive shaft, the winding direction of the spiral sleeve from a proximal end of the spiral sleeve to a distal end of the spiral sleeve, is the opposite direction of the rotating direction of the rotor and the drive shaft, when looking along the drive shaft towards a distal end of the drive shaft.

15. The catheter device according to claim 8 , wherein the spiral sleeve is made out of metal or ceramics.

16. The catheter device according to claim 1 , designed as an expandable pump, wherein a cannula is provided around a portion of the drive shaft which lies in a vicinity of the rotor and in that the rotor is located in a housing, the housing and the rotor being configured to be transferred at least in part into the cannula, wherein the housing and the rotor are compressed at least along a radial direction extending transversely to a longitudinal direction, from an expanded state into a compressed state.

17. The catheter device according to claim 16 , wherein, upon application of a force at a proximal end of a catheter or compression of the housing and the rotor, a relative motion of the drive shaft with respect to the distal bearing is effected, and wherein the drive shaft and the distal bearing are configured such that a distal end of the drive shaft remains within the distal bearing or within the heat conducting part designed as a tube or within the spiral sleeve when the housing and the rotor are compressed.

18. The catheter device according to claim 1 , wherein a hub pertaining to the rotor extends less than 0.5 mm past rotor blades of the rotor towards a distal end of the catheter device.

19. A catheter device, comprising:
a rotor located at a distal end region of the catheter device;
a drive shaft extending from a driving region of the catheter device to the distal end region of the catheter device;
a distal bearing located at a distal end of the rotor for bearing a distal end of the drive shaft; and
wherein the distal bearing comprises a heat conducting part and a spiral sleeve with a winding,
wherein the spiral sleeve with the winding is arranged within the distal bearing, such that a portion of the spiral sleeve and a portion of the heat conducting part are only separated by a thin flexible tube which is provided around a portion of an outside of the spiral sleeve.

20. The catheter device according to claim 19 , wherein the spiral sleeve is made of flat tape.

21. The catheter device according to claim 19 , wherein the drive shaft comprises a cavity extending axially with the drive shaft and wherein the drive shaft comprises a plurality of coaxial windings which run spirally around the cavity of the drive shaft, the windings within different coaxial layers having opposite winding directions and in that an outer diameter of the drive shaft lies in a range of about 0.4 mm to about 2 mm.

22. The catheter device according to claim 19 , wherein both ends of the spiral sleeve are face ground and all edges of both ends are rounded and smooth.

23. The catheter device according to claim 19 , wherein the flexible tube is provided around a portion of an outside of the spiral sleeve.

24. The catheter device according to claim 19 , wherein the rotor and the drive shaft are configured to rotate in a rotating direction such that a proximally directed flow of fluid is effected, if the catheter device is brought in contact with a fluid, and further wherein, when looking along the drive shaft towards a distal

Assignees

• Ecp Entw Mbh

Inventors

• Scheckel Mario
• Decke Robert
• Schumacher Joerg

Classifications

• A61M2205/0233

  Conductive materials, e.g. antistatic coatings for spark prevention · CPC title

• A61M60/414

  transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter · CPC title

• A61M60/216 Primary

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

• A61M60/13 Primary

  by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system · CPC title

• A61M60/422 Primary

  the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps · CPC title