CANNULA FOR INTRAOCULAR SURGERY

• US 20110213317A1
• Filed: 03/01/2011
• Published: 09/01/2011
• Est. Priority Date: 03/01/2010
• Status: Abandoned Application

• Current Assignee: Medical Instrument Development Laboratories, Inc.
• Original Assignee: Medical Instrument Development Laboratories, Inc.
• Inventors: Chen, David E-bin, Peterson, Erik William
• Application Number:
  US13/037,957
• Publication Number:
  US 20110213317A1
• Time in Patent Office: Days
• US Class Current: 604/264
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 2017/348 Means for supporting the trocar against the body or retaining the trocar inside the body
• CPC Class Codes: A61F 9/007 Methods or devices for eye surgery

Abstract

A cannula for intraocular surgery including a cup, a tube including a wall and having a tube outer diameter, the tube extending from the cup to a distal end and defining a longitudinal axis. In one implementation, the distal end includes a first portion and a second portion, the first portion having a tip and being narrower than the second portion. A gripping section is formed in the wall. The gripping section has a diameter that is less than the tube outer diameter. The gripping section allows the sclera to deform into the reduced diameter in order to increase a retention force of the cannula in the eye while minimizing damage to the tissue of the eye.

Claims

1. A cannula for intraocular surgery comprising:

a cup having an open first end and a second end; and

a hollow tube extending from the second end of the cup and including a wall and a depressed gripping section for retaining the sclera of an eye by allowing the sclera to deform into the depressed gripping section.

2. The cannula of claim 1 wherein the depressed gripping section includes a first notch formed in the wall and a second notch formed in the wall.

3. The cannula of claim 2 wherein the first notch is opposite from the second notch.

4. The cannula of claim 2 wherein the first notch extends through the wall and the second notch extends through the wall.

5. The cannula of claim 2 further comprising:

a third notch formed in the wall; and

a fourth notch formed in the wall.

6. The cannula of claim 1 wherein the tube extends from the cup to a distal end and the tube defines a longitudinal axis;

and

wherein the distal end includes a first portion and a second portion, the first portion including a tip and being narrower than the second portion.

7. The cannula of claim 6 wherein the first portion defines a first plane that is acutely angled at a first angle relative to the longitudinal axis and the second portion defines a second plane that is acutely angled at a second angle relative to the longitudinal axis and the second angle is greater than the first angle.

8. The cannula of claim 1 wherein the tube extends from the cup to a distal end including a chamfered tip.

9. The cannula of claim 7 wherein the tip is chamfered.

10. The cannula of claim 2 wherein the tube extends from the cup to a distal end and the tube defines a longitudinal axis;

and

wherein the distal end includes a first portion and a section portion, the first portion including a tip and being narrower than the second portion.

11. The cannula of claim 10 wherein the first portion defines a first plane that is acutely angled at a first angle relative to the longitudinal axis and the second portion defines a second plane that is acutely angled at a second angle relative to the longitudinal axis and the second angle is greater than the first angle.

12. The cannula of claim 10 wherein the tip is chamfered.

13. The cannula of claim 11 wherein the tip is chamfered.

14. The cannula of claim 5 wherein the tube extends from the cup to a distal end and the tube defines a longitudinal axis;

and

wherein the distal end includes a first portion and a section portion, the first portion including a tip and being narrower than the second portion.

15. The cannula of claim 14 wherein the first portion defines a first plane that is acutely angled at a first angle relative to the longitudinal axis and the second portion defines a second plane that is acutely angled at a second angle relative to the longitudinal axis and the second angle is greater than the first angle.

16. The cannula of claim 14 wherein the tip is chamfered.

17. The cannula of claim 15 wherein the tip is chamfered.

18. The cannula of claim 2 wherein the first notch is semicircular and the second notch is semicircular.

19. The cannula of claim 2 wherein the first notch is rectangular and the second notch is rectangular.

20. The cannula of claim 2 wherein the first notch is a ramped notch and the second notch is a ramped notch.

21. A cannula for intraocular surgery, the cannula comprising:

a cup;

a tube including a wall and having a tube outer diameter, the tube extending from the cup to a distal end and defining a longitudinal axis, the distal end including

a first portion and a second portion, the first portion including a chamfered tip and being narrower than the second portion; and

a gripping section formed in the wall, the gripping section having a diameter that is less than the tube outer diameter.

22. The cannula of claim 21 wherein the first portion defines a first plane that is acutely angled at a first angle relative to the longitudinal axis and the second portion defines a second plane that is acutely angled at a second angle relative to the longitudinal axis and the second angle is greater than the first angle.

23. The cannula of claim 21 wherein the gripping section includes a first notch formed in the wall and a second notch formed in the wall.

24. A cannula for intraocular surgery comprising:

a cup having an open first end and a second end; and

a hollow tube extending from the second end of the cup to a distal end, the hollow tube defining a longitudinal axis, and the distal end including a first portion and a second portion, the first portion including a tip and being narrower than the second portion.

25. The cannula of claim 24 wherein the first portion defines a first plane that is acutely angled at a first angle relative to the longitudinal axis and the second portion defines a second plane that is acutely angled at a second angle relative to the longitudinal axis and the second angle is greater than the first angle.

26. The cannula of claim 24 wherein the tip is chamfered.

27. The cannula of claim 25 wherein the tip is chamfered.