Methods and devices for cutting tissue

Patent metadata

Field	Value
Publication number	US-10219824-B2
Application number	US-201615246201-A
Country	US
Kind code	B2
Filing date	Aug 24, 2016
Priority date	Feb 25, 2008
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A catheter is provided, which includes a cutting element having one or more raised elements. The cutting element has a cup-shaped surface at the distal end that may be smooth and continuous except for the raised elements.

First claim

What is claimed is:

1. An atherectomy catheter, comprising:
a body having opposite proximal and distal ends;
a rotatable shaft coupled to the body;
a cutting element adjacent the distal end of the body and coupled to the rotatable shaft, such that the rotatable shaft is able to rotate the cutting element through a complete rotation about a longitudinal axis of the cutting element, the cutting element having opposite first and second longitudinal ends, a cutting edge extending circumferentially at the first longitudinal end of the cutting element, and an interior surface recessed longitudinally from the cutting edge; and
a raised element extending longitudinally outward from the interior surface of the cutting element toward the first longitudinal end of the cutting element, the raised element having a first side wall extending inward from the interior surface generally toward the longitudinal axis of the cutting element, and a longitudinal end wall defining a longitudinal end surface of the raised element which intersects the first side wall to form a first raised edge of the raised element,
wherein the raised element further has a second side wall extending inward from the interior surface generally toward the longitudinal axis of the cutting element, wherein the longitudinal end surface of the raised element intersects the second side wall to form a second raised edge of the raised element.

2. The catheter of claim 1 , wherein the longitudinal end surface of the raised element forms an angle from 30 degrees to 90 degrees with respect to the longitudinal axis of the cutting element.

3. The catheter of claim 1 , wherein the first raised edge has inner and outer ends relative to the longitudinal axis of the cutting element, wherein the inner end of the first raised edge is spaced radially inward from the cutting edge a distance of 0.0010 in (0.0254 mm) to 0.0020 in (0.0508 mm).

4. The catheter of claim 1 , wherein the first raised edge has inner and outer ends relative to the longitudinal axis of the cutting element, wherein the outer end of the first raised edge is recessed longitudinally from the cutting edge.

5. The catheter of claim 4 , wherein the first raised edge has inner and outer ends relative to the longitudinal axis of the cutting element, wherein the outer end of the first raised edge is recessed from the cutting edge by a longitudinal distance of 0.0010 in (0.0254 mm) to 0.0020 in (0.0508 mm).

6. The catheter of claim 1 , wherein the second raised edge is recessed longitudinally relative to the first raised edge.

7. The catheter of claim 1 , wherein the rotatable shaft is configured to rotate the cutting element so that the first raised edge is the leading edge and the second raised edge is the trailing edge.

8. The catheter of claim 1 , wherein the raised element further has an inner wall extending between and intersecting the first and second side walls and the longitudinal end wall and the interior surface of the cutting element, respectively.

Assignees

• Covidien Lp

Inventors

• Lee Kee
• Yuen Phyllis
• Doud Darren

Classifications

• A61B17/320725 Primary

  with radially expandable cutting or abrading elements (A61B17/32075 takes precedence) · 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

• A61B17/320783

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

• A61B2017/320791

  with cutter extending outside the cutting window · CPC title

• A61B17/32075

  Pullback cutting; combined forward and pullback cutting, e.g. with cutters at both sides of the plaque · CPC title