Cannula

Patent metadata

Field	Value
Publication number	US-10660632-B2
Application number	US-34081608-A
Country	US
Kind code	B2
Filing date	Dec 22, 2008
Priority date	Dec 21, 2007
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

The present disclosure relates to a cannula. The cannula includes a shaft having a distal end and a proximal end and a handle coupled to the proximal end of the shaft. The distal end of the shaft includes a tip having a spherical radius.

First claim

What is claimed is:

1. A cannula comprising:
a shaft comprising a semi-circular cross-section defining a longitudinal axis, a distal end and a proximal end, the distal end comprising an open tip that includes a spherical radius that is formed through and angle β, wherein the angle β extends up to an intersection with a cut-off angle, the cut-off angle oriented at a 20 degree angle relative to the longitudinal axis and the angle β is about 30 degrees, wherein the open tip is configured to minimize damage to adjacent tissue while guiding a medical instrument into a joint area; and
a handle coupled to the proximal end of the shaft, and wherein the tip includes an edge with a radius.

2. The cannula of claim 1 wherein the spherical radius of the tip is equal to an outer radius of the shaft.

3. The cannula of claim 1 wherein the edge has a radius of about 0.015 inches.

4. The cannula of claim 1 wherein the semi-circular cross section defines an outer radius of about 0.155 inches.

5. The cannula of claim 4 wherein the shaft includes an inner radius defining an elongate channel, the inner radius being about 0.125 inches.

6. The cannula of claim 1 wherein the cut-off angle defines a continuous angle that extends up to and including a distal-most end of the cannula.

7. The cannula of claim 1 wherein the angle β is equal to or greater than a cannula insertion angle α into the tissue surface.

8. A method of performing arthroscopic surgery comprising:
providing a cannula into a joint area of the body such that a distal end is inserted into a tissue surface within the joint at an angle α relative to the tissue surface, the cannula comprising a shaft defining a semi-cylindrical cross section, a distal end, a proximal end and a longitudinal axis extending there between, and a handle coupled to the proximal end of the shaft, the distal tip defined by a spherical radius formed through angle β that is equal to or greater than angle α, wherein the spherical radius is truncated by its intersection with a cut-off angle that is continuously oriented at an oblique angle with respect to the longitudinal axis; wherein a portion of the shaft from the proximal end to the tip consists of one outer diameter and one inner diameter and a wall with a radiused edge;
inserting a medical instrument through the cannula and into the joint area; and
performing a surgical repair in the joint area.

9. The method of claim 8 wherein angle α is about 30°.

10. The method of claim 8 wherein the angle α is greater than about 30°.

11. The method of claim 8 wherein the cut-off angle defines a continuous angle that extends up to and including a distal-most end of the cannula.

12. The method of claim 8 wherein the cut-off angle is 20 degrees.

13. A cannula comprising:
a shaft defining a semi-annular cross section having an elongate opening, the elongate opening defining a first side of the shaft, the shaft including a distal end, a proximal end and a longitudinal axis, and wherein the distal end has an open tapered tip portion, defined by a cut-off angle extending along the shaft first side, oriented at a 20 degree angle relative to the longitudinal axis and a spherical radius on a second opposing side of the shaft, the cut-off angle truncating the spherical radius so that the spherical radius is formed through angle β, wherein the spherical radius and cut-off angle intersecting at a radiused edge along the open tip portion; and
a handle coupled to the proximal end of the shaft.

14. The cannula of claim 13 wherein the cut-off angle and spherical radius both extend up to and including a distal-most end of the cannula.

15. The cannula of claim 13 wherein the cut-off angle defines a continuous angle that extends up to and including a distal-most end of the cannula.

16. The cannula of claim 13 wherein the angle β is equal to or greater than 30 degrees.

Assignees

• Torrie Paul Alexander
• Ilizaliturri Victor Manuel
• Smith & Nephew Inc

Inventors

• Torrie Paul Alexander
• Ilizaliturri Victor Manuel

Classifications

• A61B2017/320044

  Blunt dissectors · CPC title

• A61B17/025 Primary

  Joint distractors · CPC title

• A61B17/3421

  Cannulas · CPC title

• A61B17/1742

  for the hip · CPC title

• A61B2017/0275

  for the hip · CPC title