Tissue-removing catheter with guidewire isolation liner

Patent metadata

Field	Value
Publication number	US-10987126-B2
Application number	US-201815970736-A
Country	US
Kind code	B2
Filing date	May 3, 2018
Priority date	May 3, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A tissue-removing catheter for removing tissue in a body lumen includes an elongate body and a handle mounted to a proximal end portion of the elongate body. The handle is operable to cause rotation of the elongate body. A tissue-removing element is mounted on a distal end portion of the elongate body. The tissue-removing element is configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen. An inner liner is received within the elongate body and is coupled to the handle at a proximal end portion of the inner liner. The inner liner defines a guidewire lumen. The inner liner is coupled to the tissue-removing element at a distal end portion of the inner liner such that translational movement of the inner liner in the body lumen causes a corresponding translational movement of the tissue-removing element.

First claim

What is claimed is:

1. A tissue-removing catheter for removing tissue in a body lumen, the tissue-removing catheter comprising:
an elongate body having an axis, and proximal and distal end portions spaced apart from one another along the axis, wherein the elongate body is sized and shaped to be received in the body lumen;
a tissue-removing element mounted on the distal end portion of the elongate body, the tissue-removing element being configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen;
an inner liner received within the elongate body, the inner liner defining a guidewire lumen, the inner liner being coupled to the tissue-removing element at a distal end portion of the inner liner; and
a coupling assembly disposed in the tissue-removing element for coupling the inner liner to the tissue-removing element, the coupling assembly comprises a bushing attached to the distal end portion of the inner liner, the bushing including a center ring portion, a proximal ring portion extending proximally from the center ring portion, and a distal ring portion extending distally from the center ring portion, the coupling assembly further comprising a first bearing disposed around the proximal ring portion and a second bearing disposed around the distal ring portion.

2. A tissue-removing catheter as set forth in claim 1 , wherein the tissue-removing element is rotatable about at least a portion of the coupling assembly.

3. A tissue-removing catheter as set forth in claim 2 , wherein the elongate body retains the coupling assembly in the tissue-removing element.

4. A tissue-removing catheter as set forth in claim 2 , wherein the bushing receives a section of the inner liner within a channel of the bushing.

5. A tissue-removing catheter as set forth in claim 4 , wherein the center ring portion has an outer cross-sectional dimension that is larger than an outer cross-sectional dimension of the proximal and distal ring portions.

6. A tissue-removing catheter as set forth in claim 1 , wherein the first bearing has an outer cross-sectional dimension that is larger than an outer cross-sectional dimension of the second bearing.

7. A tissue-removing catheter as set forth in claim 1 , wherein the bushing is made from polyetheretherketone (PEEK) and polytetrafluoroethylene (PTFE) and the bearings are made from Zirconia.

8. A tissue-removing catheter as set forth in claim 1 , wherein a distal end of the inner liner extends distally of the tissue-removing element.

9. A tissue-removing catheter as set forth in claim 1 , further comprising a handle mounted to the proximal end portion of the elongate body and operable to cause rotation of the elongate body.

10. A tissue-removing catheter as set forth in claim 1 , wherein the inner liner extends distally of the bushing.

11. A tissue-removing catheter for removing tissue in a body lumen, the tissue-removing catheter comprising:
an elongate body having an axis, and proximal and distal end portions spaced apart from one another along the axis, wherein the elongate body is sized and shaped to be received in the body lumen;
a tissue-removing element mounted on the distal end portion of the elongate body, the tissue-removing element being configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen;
an inner liner received within the elongate body, the inner liner defining a guidewire lumen, the inner liner being coupled to the tissue-removing element at a distal end portion of the inner liner such rotational movement of the inner liner is prevented during operation of the catheter to remove the tissue; and
a coupling assembly disposed in the tissue-removing element for coupling the inner liner to the tissue-removing element, wherein the coupling assembly comprises a bushing attached to the distal end portion of the inner liner, the bushing including a center ring portion, a proximal ring portion extending proximally from the center ring portion, a distal ring portion extending distally from the center ring portion, and a channel extending through the bushing, the bushing receiving a section of the inner liner within the channel of the bushing, the coupling assembly further comprising a first bearing disposed around the proximal ring portion and a second bearing disposed around the distal ring portion.

12. A tissue-removing catheter as set forth in claim 11 , wherein the tissue-removing element is rotatable about at least a portion of the coupling assembly.

13. A tissue-removing catheter as set forth in claim 12 , wherein the elongate body retains the coupling assembly in the tissue-removing element.

14. A tissue-removing catheter as set forth in claim 11 , wherein the center ring portion has an outer cross-sectional dimension that is larger than an outer cross-sectional dimension of the proximal and distal ring portions.

15. A tissue-removing catheter as set forth in claim 11 , wherein the first bearing has an outer cross-sectional dimension that is larger than an outer cross-sectional dimension of the second bearing.

16. A tissue-removing catheter as set forth in claim 11 , wherein the bushing is made from polyetheretherketone (PEEK) and polytetrafluoroethylene (PTFE) and the bearings are made from Zirconia.

17. A tissue-removing catheter as set forth in claim 11 , wherein a distal end of the inner liner extends distally of the tissue-removing element.

18. A tissue-removing catheter as set forth in claim 11 , wherein the inner liner extends distally of the bushing.

19. A tissue-removing catheter as set forth in claim 11 , further comprising for removing tissue in a body lumen, the tissue-removing catheter comprising:
an elongate body having an axis, and proximal and distal end portions spaced apart from one another along the axis, wherein the elongate body is sized and shaped to be received in the body lumen;
a tissue-removing element mounted on the distal end portion of the elongate body, the tissue-removing element being configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen;
an inner liner received within the elongate body, the inner liner defining a guidewire lumen, the inner liner being coupled to the tissue-removing element at a distal end portion of the inner liner such that rotational movement of the inner liner is prevented during operation of the catheter to remove the tissue; and
a cavity extending through the tissue-removing element from a proximal end to a distal end of the tissue-removing element, wherein the cavity includes a first section extending distally from the proximal end of the tissue-removing element and a second section extending distally from the first section, the first section having a larger cross-sectional dimension than a cross-sectional dimension of the second section.

20. A tissue-removing catheter as set forth in claim 19 , further comprising a bushing disposed in the cavity, the bushing comprising a center ring portion, a proximal ring portion extending proximally from the center ring portion, and a distal ring portion extending distally from the center ring portion, the center ring portion being disposed in the second section of the cavity.

21. A tissue-removing catheter as set forth in claim 20 , further comprising a first bearing disposed around the proximal ring portion of the bushing and a second bearing disposed around the distal ring portion of the bushing, the fi

Assignees

• Medtronic Vascular Inc

Inventors

• Jamous Aram
• Kelly John
• Mccullen Conor
• Fleming Matthew
• Meade Colin William
• Carroll Grainne Teresa
• Morton Paul

Classifications

• A61B2017/320056

  Tunnelers · CPC title

• A61B2017/22045

  fixed to the catheter; guiding tip · CPC title

• A61B17/3207 Primary

  Atherectomy devices {working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions (A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016)} · CPC title

• A61B17/3205

  Excision instruments · CPC title

• A61B17/22

  Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for · CPC title