Percutaneous Disc Clearing Device

Patent metadata

Field	Value
Publication number	US-2016287264-A1
Application number	US-201514674310-A
Country	US
Kind code	A1
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A discectomy tool comprising:
a) a cannula having an outer surface having a longitudinal bore therein, a proximal end and a distal end; b) a steering wire disposed in the longitudinal bore; c) a flexible, hollow transmission shaft disposed in the cannula, the shaft having a throughbore, a proximal end portion, a distal end portion and an outer surface having a thread extending therefrom; d) an irrigation source fluidly connected to the throughbore; e) a cutting tip attached to the distal end portion of the transmission shaft.

First claim

We claim:

1 . A discectomy tool comprising:
a) a cannula having an outer surface having a longitudinal bore therein, a proximal end portion and a distal end portion; b) a steering wire longitudinally contacting the cannula and extending in the direction of the longitudinal bore; c) a flexible, hollow transmission shaft disposed in the cannula, the shaft having a throughbore, a proximal end portion, a distal end portion and an outer surface having a thread extending therefrom; d) an irrigation source fluidly connected to the throughbore; e) a cutting tip attached to the distal end portion of the transmission shaft;

2 . The tool of claim 1 wherein the cannula has longitudinally repeating cutouts to produce increased flexibility.

3 . The tool of claim 2 wherein the repeating cutouts form a square wave in a face of the cannula.

4 . The tool of claim 1 wherein the shaft and cutting tip extend through the distal end of the cannula.

5 . A discectomy tool comprising:
a) a cannula having an outer surface having a longitudinal bore therein, a proximal end and a distal end; b) a transmission shaft having a proximal end portion and a distal end portion; c) a rotatable cutting tip attached to the distal end portion of the transmission shaft; and d) a flexible helical auger having a proximal end portion, and intermediate portion and a distal end portion, wherein the intermediate portion is loosely wrapped around the flexible torque transmission shaft,
wherein the transmission shaft and auger are adapted to rotate within the longitudinal bore of the cannula, wherein the cutting tip extends out the bore at the distal end of the cannula.

6 . The tool of claim 5 wherein the distal end portion of the auger is rigidly attached to the distal end portion of the cutting shaft, and wherein the proximal end portion of the auger is rigidly attached to the proximal end portion of the cutting shaft.

7 . The tool of claim 5 where the intermediate portion of the auger is loosely wrapped around the transmission shaft, the proximal end portion of the auger is connected to the transmission shaft, and the distal end portion of the auger is connected to the proximal end portion of the cutting tip.

8 . A discectomy tool comprising:
a) a cannula having an outer surface having a longitudinal bore therein, a proximal end and a distal end; b) a transmission shaft having a proximal end portion and a distal end portion; c) a rotatable cutting tip attached to the distal end portion of the transmission shaft; and d) a flexible helical auger having a proximal end portion, a hollow intermediate portion and a distal end portion, wherein the proximal end portion of the auger is connected to the torque transmission shaft and the distal end portion of the auger is connected to the cutting tip,
wherein the transmission shaft and auger are adapted to rotate within the longitudinal bore of the cannula, wherein the cutting tip extends out the bore at the distal end of the cannula.

9 . A discectomy tool comprising:
a) a cannula having a proximal end, a distal end, and an outer surface having a first longitudinal recess therein; b) a transmission shaft disposed in the cannula, the shaft having a proximal end portion and a distal end portion; c) a cutting tip attached to the distal end portion of the transmission shaft; d) a first steering element disposed in the first longitudinal recess of the outer surface.

10 . The tool of claim 9 wherein the first longitudinal recess has an opening at the outer surface and the steering element has a maximum cross-section, wherein the maximum cross-section is greater than the opening of the recess at the outer surface.

11 . The tool of claim 9 wherein the cannula has a second longitudinal recess in its outer surface, the tool further comprising:
e) a second steering element disposed in the second longitudinal recess of the outer surface.

12 . The tool of claim 9 wherein the second longitudinal recess and the second steering element have matching dovetail cross-sections.

13 . The tool of claim 9 wherein the steering elements is a flat metallic or polymeric strip.

14 . The tool of claim 9 wherein the steering elements is a flat metallic or Polymeric tapered strip.

15 . A discectomy tool comprising:
a) a cannula having a proximal end, a distal end, and an outer surface; b) a transmission shaft disposed in the cannula, the shaft having a proximal end portion and a distal end portion; c) a cutting tip attached to the distal end portion of the transmission shaft; d) first and second steering elements bilaterally and longitudinally disposed on the outer surface of the cannula.

16 . A discectomy tool comprising:
d) a cannula having a proximal end portion, a distal end portion, and an outer surface; the cannula having a first longitudinal face and a second opposed longitudinal face, wherein the first longitudinal face has a plurality of alternating, opposed transverse cutouts therealong to form a substantially square wave of the first longitudinal face, e) a transmission shaft disposed in the cannula, the shaft having a proximal end portion and a distal end portion; f) a cutting tip attached to the distal end portion of the transmission shaft.

17 . The tool of claim 16 further comprising:
g) a first steering wire contacting the outer surface of the cannula substantially along the single bending plane.

18 . The tool of claim 17 further comprising:
h) a second steering wire contacting the outer surface of the cannula substantially along the single bending plane.

19 . The tool of claim 18 wherein the cutouts have a tapered distal end portion so as to form a bullet shape.

20 . The tool of claim 18 wherein at least one cutout has a proximal end portion, a middle portion and a distal end portion, each portion having a width, and wherein the width of the middle portion of the cutout is greater than the width of either the proximal end portion or the distal end portion.

21 . A discectomy tool comprising:
a) a cannula having an outer surface having a longitudinal bore therein, a proximal end and a distal end; b) a transmission shaft having a proximal end portion and a distal end portion; c) a rotatable cutting tip having a proximal end portion; and d) a flexible helical auger having a proximal end portion, and intermediate portion and a distal end portion, wherein the proximal end portion of the auger is connected to the distal end portion of the transmission shaft, and wherein the distal end portion of the auger is connected to the proximal end portion of the cutting tip; wherein the transmission shaft and auger are adapted to rotate within the longitudinal bore of the cannula, wherein the cutting tip extends out the bore at the distal end of the cannula.

Assignees

• Depuy Synthes Products Inc

Inventors

• Chegini Salman
• Richter Joern
• Thommen Daniel

Classifications

• A61B2017/00261

  Discectomy · CPC title

• A61B2217/007

  with irrigation system · CPC title

• A61B2217/005

  with suction drainage system · CPC title

• A61B17/1617 Primary

  with mobile or detachable parts · CPC title

• A61B17/1644

  using fluid other than turbine drive fluid · CPC title