Tissue-removing catheter

Patent metadata

Field	Value
Publication number	US-11819236-B2
Application number	US-202016874372-A
Country	US
Kind code	B2
Filing date	May 14, 2020
Priority date	May 17, 2019
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

A tissue-removing catheter for removing tissue in a body lumen includes a catheter body assembly having an axis and proximal and distal end portions spaced apart from one another along the axis. At least a portion of the catheter body assembly is sized and shaped to be received in the body lumen. A handle is mounted to the proximal end portion of the catheter body assembly and operable to cause rotation of the catheter body assembly. The handle includes internal handle components that interface with the catheter body assembly. The internal handle components provide at least four interface locations spaced axially along the catheter body assembly. A tissue-removing element is mounted on the distal end portion of the catheter body assembly. The tissue-removing element is configured to remove the tissue as the tissue-removing element is rotated by the catheter body assembly within the body lumen.

First claim

What is claimed is:

1. A tissue-removing catheter for removing tissue in a body lumen, the tissue-removing catheter comprising:
a catheter body assembly having an axis and proximal and distal end portions spaced apart from one another along the axis, at least a portion of the catheter body assembly being sized and shaped to be received in the body lumen;
a handle mounted to the proximal end portion of the catheter body assembly and operable to cause rotation of the catheter body assembly, the handle including internal handle components that interface with the catheter body assembly, the internal handle components providing at least four interface locations spaced axially along the catheter body assembly; and
a tissue-removing element mounted on the distal end portion of the catheter body assembly, the tissue-removing element being configured to remove the tissue as the tissue-removing element is rotated by the catheter body assembly within the body lumen;
wherein the catheter body assembly includes a rotatable elongate body configured to rotate relative to the handle and sized and shaped to be received within the body lumen, an inner liner assembly movable relative to the rotatable elongate body and having a portion of which received within the rotatable elongate body and defining a guidewire lumen, the internal handle components interfacing with the inner liner assembly and rotatable elongate body of the catheter body assembly, the internal handle components interfacing with the inner liner assembly to permit sliding movement of the inner liner assembly and prevent rotational movement of the inner liner assembly.

2. The tissue-removing catheter as set forth in claim 1 , wherein the catheter body assembly includes an isolation sheath disposed around a section of the elongate body, one of the internal handle components interfacing with the isolation sheath of the catheter body assembly.

3. The tissue-removing catheter as set forth in claim 2 , wherein the internal handle components comprise a guide tube interfacing with the inner liner assembly, a drive assembly interfacing with the elongate body, a travel sheath interface assembly interfacing with the elongate body, and an isolation sheath interface assembly interfacing with the isolation sheath.

4. The tissue-removing catheter as set forth in claim 3 , further comprising a gear assembly in the handle, wherein the drive assembly comprises a gear extension extending from the gear assembly, and a lock secured to the gear extension, the drive assembly being configured to transfer rotation from the gear to the elongate body.

5. The tissue-removing catheter as set forth in claim 4 , wherein the travel sheath interface assembly comprises a connector and a travel sheath fixedly attached to the connector and extending around the elongate body.

6. The tissue-removing catheter as set forth in claim 5 , further comprising a gear housing enclosing at least a portion of the gear assembly, the connector being attached to the gear housing.

7. The tissue-removing catheter as set forth in claim 3 , wherein the isolation sheath interface assembly comprises an interface housing receiving a proximal end of the isolation sheath.

8. The tissue-removing catheter as set forth in claim 3 , wherein the inner liner assembly comprises an inner liner and a liner key attached to a proximal end of the inner liner, the guide tube receiving the liner key in a non-rotational, sliding engagement.

9. The tissue-removing catheter as set forth in claim 8 , further comprising a distal end stop attached to a distal end of the guide tube for limiting movement of the inner liner assembly out of the guide tube.

10. A handle of a tissue-removing catheter for removing tissue in a body lumen, the handle being operable to cause rotation of a catheter body assembly of the tissue-removing catheter, the handle comprising a housing and internal handle components within the housing configured to interface with the catheter body assembly, the internal handle components providing at least four interface locations spaced axially along the catheter body assembly, wherein the internal handle components are positioned and arranged to interface with an inner liner assembly and a rotatable elongate body of the catheter body assembly configured to rotate relative to the handle, the inner liner assembly being movable relative to the rotatable elongate body and having a portion of which received within the rotatable elongate body and defining a guidewire lumen, wherein the internal handle components interface with the inner liner assembly to permit sliding movement of the inner liner assembly and prevent rotational movement of the inner liner assembly.

11. The handle as set forth in claim 10 , wherein one of the internal handle components are positioned and arranged to interface with an isolation sheath of the catheter body assembly.

12. The handle as set forth in claim 11 , wherein the internal handle components comprise a guide tube configured to interface with the inner liner assembly, a drive assembly configured to interface with the elongate body, a travel sheath interface assembly configured to interface with the elongate body, and an isolation sheath interface assembly configured to interface with the isolation sheath.

13. The handle as set forth in claim 12 , wherein the drive assembly comprises a gear extension and a lock secured to the gear extension, the drive assembly being configured to impart rotation to the elongate body.

14. The handle as set forth in claim 12 , wherein the travel sheath interface assembly comprises a connector and a travel sheath fixedly attached to the connector.

15. The handle as set forth in claim 14 , further comprising a gear assembly and a gear housing enclosing at least a portion of the gear assembly, the connector being attached to the gear housing.

16. The handle as set forth in claim 12 , wherein the isolation sheath interface assembly comprises an interface housing configured to receive a proximal end of the isolation sheath.

17. The handle as set forth in claim 12 , wherein the guide tube is configured to receive the inner liner assembly in a non-rotational, sliding engagement.

18. The handle as set forth in claim 12 , further comprising a distal end stop attached to a distal end of the guide tube for limiting movement of the inner liner assembly out of the guide tube.

19. A tissue-removing catheter for removing tissue in a body lumen, the tissue-removing catheter comprising:
a catheter body assembly including a rotatable elongate body having an axis and proximal and distal end portions spaced apart from one another along the axis, the rotatable elongate body being sized and shaped to be received in the body lumen, and a liner assembly movably received within the rotatable elongate body and defining a guidewire lumen, the liner assembly isolating an interior of the guidewire lumen from the rotatable elongate body such that rotational and torsional forces are not transferred from the rotatable elongate body to the interior of the guidewire lumen when the rotatable elongate body is rotated during operation of the tissue-removing catheter; and
a handle mounted to the proximal end portion of the catheter body assembly and operable to cause rotation of the rotatable elongate body relative to the handle, the handle including internal handle components interfacing with the liner assembly and rotatable elongate body to stabilize the liner assembly and rotatable elongate body and align the liner assembly within the rotatable elon

Assignees

• Medtronic Vascular Inc

Inventors

• Kelly Tomas
• Kelly John
• Jamous Aram
• Fleming Matthew
• Finn Ronan
• Hansen Bryan
• Kelly Niall
• Cunniffe Damian
• Hayden Tommy
• Clifford John
• Sayers Michael
• Walsh Eoin
• Cooney Shane
• Walsh Cian
• Donegan Mick

Classifications

• 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

• A61B17/320783

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

• A61B2017/00075

  Motion · CPC title

• A61B2017/320716

  comprising means for preventing embolism by dislodged material · CPC title

• A61B2017/320775

  Morcellators, impeller or propeller like means · CPC title