Tissue-removing catheter with guidewire isolation liner

Patent metadata

Field	Value
Publication number	US-2018317954-A1
Application number	US-201815970748-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 tissue-removing element 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 coupled to a handle at a proximal end of the inner liner. The inner liner defines a guidewire lumen. The inner liner isolates an interior of the guidewire lumen from the elongate body and tissue-removing element such that rotational and torsional forces are not transferred from the elongate body and tissue-removing element to the interior of the guidewire lumen when the elongate body and tissue-removing element are rotated during operation of the tissue-removing catheter.

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, the elongate body being sized and shaped to be received in the body lumen; a handle mounted on 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 of the inner liner, the inner liner defining a guidewire lumen, the inner liner isolating an interior of the guidewire lumen from the elongate body and tissue-removing element such that rotational and torsional forces are not transferred from the elongate body and tissue-removing element to the interior of the guidewire lumen when the elongate body and tissue-removing element are rotated during operation of the tissue-removing catheter.

2 . A tissue-removing catheter as set forth in claim 1 , wherein the inner liner comprises a plurality of layers each extending from the proximal end of the inner liner to a distal end of the inner liner.

3 . A tissue-removing catheter as set forth in claim 2 , wherein the inner liner includes an inner layer, an outer layer, and an intermediate layer disposed between the inner and outer layers.

4 . A tissue-removing catheter as set forth in claim 3 , wherein the inner layer comprises Polytetrafluorethylene (PTFE), the intermediate layer comprises stainless steel, and the outer layer comprises polyimide.

5 . A tissue-removing catheter as set forth in claim 1 , further comprising a marker band on a distal end portion of the inner liner configuring the distal end portion to be fluoroscopically visible.

6 . A tissue-removing catheter as set forth in claim 5 , further comprising an atraumatic tip disposed on the distal end portion of the inner liner.

7 . A tissue-removing catheter as set forth in claim 5 , further comprising a tapered tip disposed on the distal end portion of the inner liner.

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

9 . A tissue-removing catheter as set forth in claim 8 , wherein the guidewire lumen extends through the distal end of the inner liner.

10 . A tissue-removing catheter as set forth in claim 8 , wherein the inner liner is movably coupled to the handle such that the inner liner is configured to translate relative to the handle.

11 . A tissue-removing catheter as set forth in claim 8 , wherein the inner liner is fixedly coupled to the handle such that the inner liner is prevented from translating relative to the handle.

12 . A tissue-removing catheter as set forth in claim 1 , wherein the tissue-removing element comprises an abrasive burr.

13 . A tissue-removing catheter as set forth in claim 1 , further comprising a motor in the handle and operatively engaging the elongate body for driving rotation of the elongate body and tissue-removing element mounted on the elongate body.

14 . A tissue-removing catheter as set forth in claim 13 , further comprising an actuator positioned on the handle and configured to selectively actuate the motor to drive rotation of the elongate body and tissue-removing element.

15 . A tissue-removing catheter as set forth in claim 1 , further comprising an advancer mounted on the handle and operatively coupled to the elongate body for moving the elongate body relative to the handle.

16 . 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, the elongate body being 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 and movable relative to the elongate body, the inner liner defining a guidewire lumen, the inner liner isolating an interior of the guidewire lumen from the elongate body and tissue-removing element such that rotational and torsional forces are not transferred from the elongate body and tissue-removing element to the interior of the guidewire lumen when the elongate body and tissue-removing element are rotated during operation of the tissue-removing catheter.

17 . A tissue-removing catheter as set forth in claim 16 , wherein the inner liner comprises a plurality of layers each extending from a proximal end of the inner liner to a distal end of the inner liner.

18 . A tissue-removing catheter as set forth in claim 17 , wherein the inner liner includes an inner layer, an outer layer, and an intermediate layer disposed between the inner and outer layers.

19 . A tissue-removing catheter as set forth in claim 18 , wherein the inner layer comprises Polytetrafluorethylene (PTFE), the intermediate layer comprises stainless steel, and the outer layer comprises polyimide.

20 . A method of removing tissue in a body lumen, the method comprising:
advancing a tissue-removing catheter over a guidewire in the body lumen to position a distal end of the catheter adjacent the tissue and a proximal end portion of the catheter outside of the body lumen, the catheter comprising an elongate body and a tissue removing element mounted on a distal end portion of the elongate body, and an inner liner disposed within the elongate body, the inner liner defining a guidewire lumen in which the guidewire is disposed during the advancement of the catheter; actuating a motor to rotate the elongate body and tissue-removing element of the catheter to remove the tissue; and isolating the guidewire from the elongate body and tissue-removing element with the inner liner so that rotational and torsional forces are not transferred from the rotating elongate body and tissue-removing element to the guidewire during rotation of the elongate body and tissue-removing element.

21 . A method of claim 20 , further comprising advancing the inner liner through the body lumen to move the inner liner relative to the elongate body.

22 . A method of claim 20 , further comprising advancing the elongate body and tissue-removing element through the body lumen to move the elongate body and tissue-removing element relative to the inner liner.

Assignees

• Medtronic Vascular Inc

Inventors

• Jamous Aram
• Kelly John
• Fleming Matthew
• Meade Colin William
• Carroll Grainne Teresa

Classifications

• A61B17/32002

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B2017/320741

  for stripping the intima or the internal plaque from a blood vessel, e.g. for endarterectomy · CPC title

• A61B2017/320775

  Morcellators, impeller or propeller like means · CPC title

• A61B2017/320004

  abrasive · CPC title

• A61B17/320758 Primary

  with a rotating cutting instrument, e.g. motor driven (A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002) · CPC title