Cannula and a retractor for percutaneous surgery

• US 6,425,859 B1
• Filed: 11/09/1999
• Issued: 07/30/2002
• Est. Priority Date: 03/22/1996
• Status: Expired due to Term

• Current Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Original Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Inventors: Clayton, John B., Smith, Maurice Mell, Moctezuma, Joseph, Foley, Kevin Thomas
• Primary Examiner(s): Leubecker, John P.
• Application Number:
  US09/436,946
• Time in Patent Office: 994 Days
• Field of Search: 600/210, 600/204, 600/208, 600/227, 600/235
• US Class Current: 600/204
• CPC Class Codes: A61B 17/02 for holding wounds open; Tractors specula A61B1/32 ; drainage appliances for wounds A61M27/00
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 2017/00261 Discectomy
• CPC Class Codes: A61B 2017/00296 mounted on an endoscope
• CPC Class Codes: A61B 2017/0046 with a releasable handle; with handle and operating part separable
• CPC Class Codes: A61B 2017/00469 for insertion of instruments, e.g. guide wire, optical fibre
• CPC Class Codes: A61B 2017/0262 with a provision for protecting nerves
• CPC Class Codes: A61B 2017/3445 used as instrument channel for multiple instruments
• CPC Class Codes: A61B 2017/347 Locking means, e.g. for locking instrument in cannula
• CPC Class Codes: A61B 2090/306 using optical fibres
• CPC Class Codes: A61B 2090/3614 using optical fibre
• CPC Class Codes: A61B 2090/373 using light, e.g. by using optical scanners
• CPC Class Codes: A61B 90/50 Supports for surgical instruments, e.g. articulated arms
• CPC Class Codes: A61M 29/00 Dilators with or without means for introducing media, e.g. remedies instruments for performing visual medical inspections of cavities or tubes of the body A61B1/00
• CPC Class Codes: A61M 29/02 Dilators made of swellable material balloon catheters for angioplasty A61M25/104

Abstract

A device for retracting tissue that includes a cannula and a retractor positionable in the working channel of the cannula. The retractor includes a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue.

Claims

1. A device for retracting tissue, comprising:

a cannula having an inner cylindrical surface defining a working channel extending between a working end and a proximal end;

a retractor positionable in said cannula, said retractor including;

a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue; and

a body having a proximal first end and a distal second end, said second end being integral with said working tip, and having a length from said first end to said second end sufficient so that said first end and said working tip can be outside said cannula when said body is in said working channel of said cannula, wherein said body includes a convex surface having a diameter that is greater than the diameter of the inner cylindrical surface of said cannula, said body being resiliently deformable to be insertable into said cannula with said convex surface in contact with said inner cylindrical surface of said cannula.

2. The device according to claim 1, wherein said convex surface of said body is configured to conform to said inner cylindrical surface of said cannula when said tissue retractor is disposed within said cannula.

3. The device according to claim 1, wherein said body is sized to be rotatably received within said cannula.

4. The device of claim 1, wherein said body includes a curved plate defining said convex surface and an opposite concave surface.

5. The device of claim 4, wherein said curved plate includes opposite edges extending substantially parallel to said length of said body, said curved plate defining a circular cross-section extending between said opposite edges subtending an arc of at least 200 degrees.

6. A device for retracting tissue, comprising:

a cannula having an inner cylindrical surface defining a working channel between a working end and a proximal end;

a retractor positionable in said working channel of said cannula, said retractor including;

a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue; and

a body having a proximal first end and a distal second end adjacent said working tip, said body sized to be rotatably received within the cannula and having a length from said first end to said second end sufficient so that said first end and said working tip can be outside the cannula when said body is within the cannula, said body having a convex surface extending along at least a portion of said length configured to conform to the inner surface of the cannula when said body and said working tip are disposed within the cannula, wherein said convex surface of said body is at a diameter that is greater than the diameter of said inner cylindrical surface of said cannula, said body being resiliently deformable to be insertable into the cannula with said convex surface in contact with said inner cylindrical surface of said cannula.

7. The device of claim 6, wherein said working tip has a blunt curved end.

8. The device of claim 6, wherein said body includes a curved plate defining said convex surface and an opposite concave surface.

9. The device of claim 8, wherein said curved plate includes opposite edges extending substantially parallel to said length of said body, said curved plate subtending an arc between said opposite edges of at least 200 degrees.

10. The device of claim 9, wherein said curved plate subtends an arc between said opposite edges of about 270 degrees.

11. The device of claim 6, further comprising an arm attached to said proximal first end of said body, said arm having a gripping surface to facilitate manipulation of said tissue retractor.

12. The device of claim 11, wherein said arm is substantially perpendicular to said length of said body.

13. A device for retracting tissue, comprising:

a cannula having an inner cylindrical surface defining a working channel between a working end and a proximal end;

a retractor positionable in said working channel of said cannula, said retractor including;

a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue;

a body having a proximal first end and a distal second end, said second end being integral with said working tip, said body sized to be rotatably received within the cannula and having a length from said first end to said second end sufficient so that said first end and said working tip can be outside the cannula when said body is within the cannula, said body having a convex surface extending along at least a portion of said length configured to conform to the inner surface of the cannula when said body and said working tip are disposed within the cannula; and

an arm to facilitate manipulation of said tissue retractor attached to said proximal end of said body and extending substantially perpendicular to said length of said body.

14. The device of claim 13, wherein said working tip has a blunt curved end.

15. The device of claim 13, wherein said body includes a curved plate defining said convex surface and an opposite concave surface.

16. The device of claim 15, wherein said curved plate includes opposite edges extending substantially parallel to said length of said body, said curved plate subtending an arc between said opposite edges of at least 200 degrees.

17. The device of claim 16, wherein said curved plate subtends an arc between said opposite edges of about 270 degrees.

18. The device of claim 13, wherein said convex surface of said body is at a diameter that is greater than the diameter of said inner cylindrical surface of said cannula, said body being resiliently deformable to be insertable into the cannula with said convex surface in contact with said inner cylindrical surface of said cannula.

19. The device of claim 13, wherein said arm includes a gripping surface.

20. A device for retracting tissue, comprising:

a cannula having an inner cylindrical surface extending between a working end and a proximal end;

a retractor positionable in said cannula, said retractor including;

a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue;

a body having a proximal first end and a distal second end, said second end being adjacent said working tip, said body having a convex surface defining a working channel between said first end and said second end configured to receive at least one surgical tool therethrough when said retractor is disposed within said cannula, said body having a length from said first end to said second end sufficient so that said first end and said working tip can be outside said cannula when said body is within said cannula; and

an arm to facilitate manipulation of said tissue retractor attached to said proximal end of said body and extending substantially perpendicular to said length of said body.

21. The device of claim 20, wherein said working tip has a blunt curved end.

22. The tissue retractor of claim 20, wherein said body includes a curved plate defining said convex surface and an opposite concave surface.

23. The device of claim 22, wherein said curved plate includes opposite edges extending substantially parallel to said length of said body, said curved plate subtending an arc between said opposite edges of at least 200 degrees.

24. The device of claim 23, wherein said curved plate subtends an arc between said opposite edges of about 270 degrees.

25. The device of claim 20, wherein said arm has a gripping surface.

26. The device of claim 20, wherein said body is configured to conform to said inner surface of said cannula.

27. The device of claim 26, wherein said body is rotatably received within said cannula.

28. The device of claim 26, wherein said body includes a curved plate defining said convex surface and an opposite concave surface.

29. The device of claim 28, wherein said curved plate includes opposite edges extending substantially parallel to said length of said body, said curved plate defining a circular cross-section extending between said opposite edges subtending an arc of at least 200 degrees.

30. A device for retracting tissue, comprising:

a cannula having an inner cylindrical surface extending between a working end and a proximal end;

a retractor positionable in said cannula, said retractor including;

a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue; and

a body having a proximal first end and a distal second end, said second end adjacent said working tip, said body having plate with a convex surface and opposite concave surface extending between opposite edges and configured to allow at least one surgical tool to extend through said cannula when said retractor is disposed within said cannula, said plate having a portion subtending an arc between said opposite edges that is less than 360 degrees, said body having a length from said first end to said second end sufficient so that said first end and said working tipcan be outside said cannula adjacent said working end when said portion of said plate is within said cannula.

31. The device of claim 30, wherein said portion extends between said first end and said second end.

32. The device of claim 30, wherein said plate subtends an arc between said opposite edges of at least 200 degrees.

33. The device of claim 30, wherein said plate subtends an arc between said opposite edges of about 270 degrees.

34. The device of claim 30, wherein said plate is configured to exert an outward force against said inner surface of said cannula to frictionally hold said retractor in a selected position relative to said cannula.

35. The device of claim 30, wherein said subtended angle between said opposite edges decreases along said length of said body.

36. The device of claim 30, wherein said plate includes a second portion subtending a second arc that is different from said arc subtended by said portion.

37. A device for retracting tissue, comprising:

a cannula having an inner cylindrical surface extending between a working end and a proximal end;

a retractor positionable in said cannula, said retractor including;

a working tip configured to atraumatically displace tissue as the retractor is manipulated through the tissue; and

a body having a proximal first end and a distal second end, said second end adjacent said working tip, said body configured to receive at least one surgical tool extending through said cannula when said retractor is disposed within said cannula, said body having a length from said first end to said second end sufficient so that said first end and said working tip can be outside said cannula when said body is within said cannula, wherein said body is configured to exert an outward force against said inner surface of said cannula to frictionally hold said retractor in a selected position relative to said cannula.

38. The device of claim 37, wherein said body includes an inner concave surface and an outer convex surface, said convex surface being at a diameter that is greater than the diameter of said inner cylindrical surface of said cannula, said body being resiliently deformable for insertion into the cannula with said convex surface in contact with said inner cylindrical surface of said cannula.