Tissue-removing catheter with guidewire isolation liner

Patent metadata

Field	Value
Publication number	US-2018317952-A1
Application number	US-201815970736-A
Country	US
Kind code	A1
Filing date	May 3, 2018
Priority date	May 3, 2017
Publication date	Nov 8, 2018
Grant date	—

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 handle mounted to the proximal end portion of the elongate body and operable to cause rotation of the elongate body; 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; and an inner liner received within the elongate body and coupled to the handle at a proximal end portion of the inner liner, 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 translational movement of the inner liner in the body lumen causes a corresponding translational movement of the tissue-removing element.

2 . A tissue-removing catheter as set forth in claim 1 , further comprising a coupling assembly disposed in the tissue-removing element for coupling the inner liner to the tissue-removing element, the tissue-removing element being 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 coupling assembly comprises a bushing attached to the distal end portion of the inner liner, the bushing receiving 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 bushing comprises 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 having 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 5 , wherein the coupling assembly further comprises a first bearing disposed around the proximal ring portion and a second bearing disposed around the distal ring portion.

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

8 . A tissue-removing catheter as set forth in claim 6 , wherein the bushing is made from polyetheretherketone (PEEK) and polytetrafluoroethylene (PTFE) and the bearings are made from Zirconia.

9 . 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.

10 . 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; and 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 translational movement of the inner liner in the body lumen causes a corresponding translational movement of the tissue-removing element.

11 . A tissue-removing catheter as set forth in claim 10 , further comprising a coupling assembly disposed in the tissue-removing element for coupling the inner liner to the tissue-removing element, the tissue-removing element being rotatable about at least a portion of the coupling assembly.

12 . A tissue-removing catheter as set forth in claim 11 , wherein the elongate body retains the coupling assembly in the tissue-removing element.

13 . A tissue-removing catheter as set forth in claim 11 , 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.

14 . A tissue-removing catheter as set forth in claim 10 , further comprising 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.

15 . A tissue-removing catheter as set forth in claim 14 , 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.

16 . A tissue-removing catheter as set forth in claim 15 , 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 first bearing being disposed in the first section of the cavity and the second bearing being disposed in the second section of the cavity.

17 . A tissue-removing catheter as set forth in claim 16 , wherein the cavity includes a third section extending distally from the second section, and a fourth section extending distally from the third section to the distal end of the tissue removing element, the third section having a larger cross-sectional dimension than a cross-sectional dimension of the fourth section.

18 . A tissue-removing catheter as set forth in claim 17 , wherein the proximal ring portion of the bushing is disposed in the first section of the cavity and the distal ring portion of the bushing is disposed in the second and third sections of the cavity.

19 . A method of removing tissue in a body lumen, the method comprising:
advancing an elongate body and a tissue removing element mounted on a distal end portion of the elongate body through the body lumen to position the tissue-removing element adjacent the tissue and a proximal end portion of the elongate body outside of the body lumen; advancing an inner liner disposed within the elongate body through the body lumen to position a distal end portion of the inner liner adjacent the tissue and a proximal end portion of the inner liner outside of the body lumen, the inner liner defining a guidewire lumen; and coupling the inner liner to the tissue-removing element at a distal end portion of the inner liner su

Assignees

• Medtronic Vascular Inc

Inventors

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

Classifications

• A61B17/320783

  through side-hole, e.g. sliding or rotating cutter inside catheter · CPC title

• A61M2025/0096

  being laterally outward extensions or tools, e.g. hooks or fibres · CPC title

• A61B2017/00845

  of moving parts with respect to each other · CPC title

• A61B2017/00738

  part of the tool being offset with respect to a main axis, e.g. for better view for the surgeon · CPC title

• A61B17/00234

  for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence) · CPC title