Material removal device having improved material capture efficiency and methods of use

• US 9,913,659 B2
• Filed: 04/13/2015
• Issued: 03/13/2018
• Est. Priority Date: 12/11/2009
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Zhang, Zhiyong, Moberg, John Robert, Rangwala, Hussain S., McPeak, Thomas John, Whealon, William Joseph, Kusleika, Richard S.
• Primary Examiner(s): NGUYEN, TUAN VAN
• Application Number:
  US14/684,972
• Publication Number:
  US 20150216555A1
• Time in Patent Office: 1,065 Days
• CPC Class Codes: A61B 17/320758 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 Class Codes: A61B 17/320783 through side-hole, e.g. sliding or rotating cutter inside catheter
• CPC Class Codes: A61B 2017/00685 Archimedes screw
• CPC Class Codes: A61B 2017/320032 Details of the rotating or oscillating shaft, e.g. using a flexible shaft
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means
• CPC Class Codes: A61B 2017/320791 with cutter extending outside the cutting window

Abstract

An atherectomy catheter directs particles generated by a cutting element into a collection chamber. A paddle attached to the cutting element propels fluid distally in the tissue collection chamber.

Claims

1. An atherectomy catheter, comprising:

a body having an opening;

a rotatable shaft coupled to the body;

a cutting element coupled to the rotatable shaft, the cutting element having a cutting edge;

a tissue collection chamber coupled to the body and positioned distal to the cutting element; and

a paddle attached to the cutting element and configured to propel fluid distally in the tissue collection chamber.

2. The catheter of claim 1, wherein the cutting element has a cup-shaped surface, the cup-shaped surface being configured to re-direct tissue cut by the cutting edge in a distal direction when the cup-shaped surface moves in the distal direction.

3. The catheter of claim 2, wherein the paddle is attached to the cup-shaped surface of the cutting element.

4. The catheter of claim 1, wherein the paddle is a wire that is twisted in a helical configuration.

5. The catheter of claim 4, wherein the wire has a rectangular cross section.

6. The catheter of claim 4, wherein the wire has a thickness from 0.002 to 0.020 inch (0.0051 to 0.051 cm).

7. The catheter of claim 4, wherein the wire width is from 0.010 to 0.075 inch (0.025 to 0.19 cm).

8. The catheter of claim 4, wherein the paddle has a wire width that is from 20 to 95 percent of an inside diameter of the collection chamber.

9. The catheter of claim 1, wherein the paddle has a longitudinal length that is at least 50 percent of a longitudinal length of the collection chamber.

10. The catheter of claim 1, wherein the paddle has a longitudinal length that is at least 70 percent of a longitudinal length of the collection chamber.

11. The catheter of claim 1, wherein the tissue collection chamber comprises vent holes.

12. The catheter of claim 11, wherein the tissue collection chamber comprises 10 to 200 vent holes.

13. The catheter of claim 11, wherein the vent holes have a diameter of from 25 to 200 microns.

14. The catheter of claim 1, wherein the collection chamber comprises a portion at a distal end that can be opened to remove cut material and particles.

15. The catheter of claim 1, wherein the cutting element is movable between a stored position and a cutting position relative to the opening.

16. A method of removing material from a body lumen, the method comprising:

providing an atherectomy catheter, the atherectomy catheter comprising;

a body having an opening;

a rotatable shaft coupled to the body;

a cutting element coupled to the rotatable shaft, the cutting element having a cutting edge;

a tissue collection chamber coupled to the body and positioned distal to the cutting element; and

a paddle attached to the cutting element and configured to propel fluid distally in the tissue collection chamber;

placing the catheter in the body lumen; and

moving the catheter in the body lumen to contact the cutting element with the material in the body lumen.

17. The method of claim 16, wherein the catheter is moved in a distal direction to contact the cutting edge with the material in the body lumen.

18. The method of claim 16, wherein the catheter is placed in the body lumen with the cutting element in a stored position and the catheter is moved to contact the material with the cutting element in a cutting position.

19. The method of claim 16, wherein the body lumen is a blood vessel.

20. The method of claim 16, further comprising rotating the paddle to propel fluid distally in the tissue collection chamber.

21. The method of claim 20, further comprising rotating the cutting element to remove material in the body lumen, wherein said rotating the cutting element and said rotating the paddle are performed simultaneously.