Cutting block for bone resection

• US 20080015602A1
• Filed: 06/22/2006
• Published: 01/17/2008
• Est. Priority Date: 06/22/2006
• Status: Abandoned Application

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Inventors: Axelson, Stuart L.
• Application Number:
  US11/472,610
• Publication Number:
  US 20080015602A1
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 2034/2068 using pointers, e.g. pointers having reference marks for determining coordinates of body points
• CPC Class Codes: A61B 90/94 coded with symbols, e.g. text

Abstract

A cutting block having a base, and a top connected to the base via four walls is disclosed. Each wall has an outwardly facing surface to guide a cutting tool. Each wall also has an attachment hole where a tracker may be attached. The cutting block is floated on the bone using the navigation system to position it at correct locations for the bone resection. After correctly locating the cutting block for each required cut, cutting block is fixed to the bone using pins and the bone resected. Same cutting block is suitable for resection of bone for installation of any size prosthetic device. For certain resections, the rotation angle may be mechanically set and need not be navigated.

Claims

1. A cutting block for bone resection, comprising:

a base;

a top;

a first outwardly facing surface extending between the base and the top, the first outwardly facing surface providing a first guiding surface for the resection of anterior surface of the femur;

a second outwardly facing surface extending between the base and the top, the second outwardly facing surface providing a second guiding surface for the resection of the posterior and the distal surface of the femur;

a third outwardly facing surface extending between the base and the top, the third outwardly facing surface providing a third guiding surface for making the anterior chamfer cut on the femur; and

a fourth outwardly facing surface extending between the base and the top, the fourth outwardly facing surface providing a fourth guiding surface for making the posterior chamfer cut on the femur.

2. The cutting block of claim 1, further comprising:

at least two holes extending from the top to the base.

3. The cutting block of claim 2, further comprising:

a first slot and a second slot, the first and the second slot extending through the thickness of the cutting block and being parallel to each other; and

a third slot and a fourth slot, the third and the fourth slot extending through the thickness of the block and being parallel to each other and orthogonal to the first and the second slot.

4. The cutting block of claim 2, further comprising:

at least one mounting means for mounting a tracker.

5. The cutting block of claim 4, wherein the mounting means is an opening on one of the first, second, third or fourth outwardly facing surface.

6. The cutting block of claim 5, further comprising:

a tracker mounted in the mounting means.

7. The cutting block of claim 5, wherein the first outwardly facing surface extending between the base and the top is angled with respect to the base.

8. The cutting block of claim 7, wherein the angle matches an angle on a prosthetic device.

9. The cutting block of claim 8, wherein the bone being resected is a femur.

10. A cutting block for bone resection, comprising:

a base;

a top; and

four outwardly facing surfaces connecting the base and the top, each of the four outwardly facing surfaces providing at least one guiding surface for making at least one bone resection;

wherein one size cutting block can be used for femoral resection suitable for any size femoral prosthesis.

11. The cutting block of claim 10, further comprising:

at least two holes extending from the top to the base.

12. The cutting block of claim 11, further comprising:

a first slot and a second slot, the first and the second slot extending through the thickness of the cutting block and being parallel to each other; and

a third slot and a fourth slot, the third and the fourth slot extending through the thickness of the block and being parallel to each other and orthogonal to the first and the second slot.

13. The cutting block of claim 11, further comprising:

at least one mounting means for mounting a tracker.

14. The cutting block of claim 13, wherein the mounting means is an opening on one of the four outwardly facing surfaces.

15. The cutting block of claim 14, further comprising:

a tracker mounted in the mounting means.

16. The cutting block of claim 14, wherein one of the four outwardly facing surfaces extending between the base and the top is angled with respect to the base.

17. The cutting block of claim 16, wherein the angle matches an angle on a prosthetic device.

18. The cutting block of claim 17, wherein the bone being resected is a femur.

19. A cutting block for femoral resection, comprising:

a base;

a top; and

four outwardly facing surfaces connecting the base and the top, each of the four outwardly facing surfaces providing at least one guiding surface for making at least one of the anterior, posterior, distal, anterior chamfer and posterior chamfer cuts;

wherein the outwardly facing surface providing the guiding surface for the anterior cut is angled with respect to the base, the angle matching the anterior flange angle of a femoral prosthesis.

20. The cutting block of claim 19, further comprising:

at least two holes extending from the top to the base.

21. The cutting block of claim 20, further comprising:

a first slot and a second slot, the first and the second slot extending through the thickness of the cutting block and being parallel to each other; and

a third slot and a fourth slot, the third and the fourth slot extending through the thickness of the block and being parallel to each other and orthogonal to the first and the second slot.

22. The cutting block of claim 20, further comprising:

at least one mounting means for mounting a tracker.

23. The cutting block of claim 22, wherein the mounting means is an opening on one of the four outwardly facing surfaces.

24. The cutting block of claim 23, further comprising:

a tracker mounted in the mounting means.

25. A cutting block for femoral resection, comprising:

a base;

a top;

a first outwardly facing surface extending between the base and the top, the first outwardly facing surface providing a first guiding surface for the resection of anterior surface of the femur;

a second outwardly facing surface extending between the base and the top, the second outwardly facing surface providing a second guiding surface for the resection of the posterior and the distal surface of the femur;

a third outwardly facing surface extending between the base and the top, the third outwardly facing surface providing a third guiding surface for making the anterior chamfer cut on the femur; and

a fourth outwardly facing surface extending between the base and the top, the fourth outwardly facing surface providing a fourth guiding surface for making the posterior chamfer cut on the femur;

wherein the first outwardly facing surface is angled with respect to the base.

26. The cutting block of claim 25, further comprising:

at least two holes extending from the top to the base.

27. The cutting block of claim 26, further comprising:

a first slot and a second slot, the first and the second slot extending through the thickness of the cutting block and being parallel to each other; and

a third slot and a fourth slot, the third and the fourth slot extending through the thickness of the block and being parallel to each other and orthogonal to the first and the second slot.

28. The cutting block of claim 26, further comprising:

at least one mounting means for mounting a tracker.

29. The cutting block of claim 28, wherein the mounting means is an opening on one of the four outwardly facing surfaces.

30. The cutting block of claim 29, further comprising:

a tracker mounted in the mounting means.

31. The cutting block of claim 30, wherein the angle formed by the first outwardly facing surface with respect to the base matches an angle on a prosthetic device.

32. A cutting block for femoral resection, comprising:

a base;

a top;

a first outwardly facing surface extending between the base and the top, the first outwardly facing surface providing a first guiding surface for the resection of anterior surface of the femur;

a second outwardly facing surface extending between the base and the top, the second outwardly facing surface providing a second guiding surface for the resection of the posterior and the distal surface of the femur; and

a third outwardly facing surface extending between the base and the top, the third outwardly facing surface providing a third guiding surface for making the anterior chamfer cut and the posterior chamfer cut on the femur;

wherein one size cutting block can be used for femoral resection suitable for any size femoral prosthesis.

33. The cutting block of claim 32, further comprising:

at least two holes extending from the top to the base.

34. The cutting block of claim 33, further comprising:

a first slot and a second slot, the first and the second slot extending through the thickness of the cutting block and being parallel to each other; and

a third slot and a fourth slot, the third and the fourth slot extending through the thickness of the block and being parallel to each other and orthogonal to the first and the second slot.

35. The cutting block of claim 33, further comprising:

at least one mounting means for mounting a tracker.

36. The cutting block of claim 35, wherein the mounting means is an opening on one of the first, second or third outwardly facing surface.

37. The cutting block of claim 36, further comprising:

a tracker mounted in the mounting means.

38. The cutting block of claim 36, wherein the first outwardly facing surface extending between the base and the top is angled with respect to the base.

39. The cutting block of claim 38, wherein the angle matches an angle on a prosthetic device.

40. A cutting block for femoral resection, comprising:

a base;

a top;

a first outwardly facing surface extending between the base and the top, the first outwardly facing surface providing a first guiding surface for the resection of anterior surface of the femur;

an angle formed between the first outwardly facing surface and the base, the angle matching the anterior flange angle of a femoral prosthesis to be implanted;

a second outwardly facing surface extending between the base and the top, the second outwardly facing surface providing a second guiding surface for the resection of the posterior and the distal surface of the femur;

a third outwardly facing surface extending between the base and the top, the third outwardly facing surface providing a third guiding surface for making the anterior chamfer cut on the femur; and

a fourth outwardly facing surface extending between the base and the top, the fourth outwardly facing surface providing a fourth guiding surface for making the posterior chamfer cut on the femur;

wherein one size cutting block can be used for femoral resection suitable for any size femoral prosthesis.

41. The cutting block of claim 40, further comprising:

at least two holes extending from the top to the base.

42. The cutting block of claim 41, further comprising:

a first slot and a second slot, the first and the second slot extending through the thickness of the cutting block and being parallel to each other; and

a third slot and a fourth slot, the third and the fourth slot extending through the thickness of the block and being parallel to each other and orthogonal to the first and the second slot.

43. The cutting block of claim 41, further comprising:

at least one mounting means for mounting a tracker.

44. The cutting block of claim 43, wherein the mounting means is an opening on one of the first, second, third or fourth outwardly facing surface.

45. The cutting block of claim 44, further comprising:

a tracker mounted in the mounting means.

46. A method of resecting a femur, the method comprising the steps of:

locating a cutting block on the anterior surface of the femur using a navigation system;

making a distal cut on the femur using a surface of the cutting block to guide the cutting instrument, the cutting block being located on the anterior surface of the femur, and the cut resulting in a planer distal surface;

locating the cutting block in a first location on the planer distal surface using the navigation system;

anchoring the cutting block on the planer distal surface using pins;

re-locating the cutting block in a second, third and fourth position on the planer distal surface using the navigation system;

making an anterior cut, a posterior cut, an anterior chamfer cut and a posterior chamfer cut using a surface of the cutting block as a guide, the cutting block being anchored in the first, second, third and fourth position respectively during the making of the anterior cut, the posterior cut, the anterior chamfer cut and the posterior chamfer cut.

47. The method of claim 46, further comprising the steps of:

using the pins installed for anchoring in the first position to mechanically fix the rotation of the relocated cutting block in the second, third, and fourth position.

48. A method of resecting a femur, the method comprising the steps of:

providing a cutting block adapted to resecting the femur for installation of any size prosthetic device, the cutting block having an angled surface, the angle of the angled surface matching an angle on the prosthetic device;

locating a cutting block on the anterior surface of the femur using a navigation system;

making a distal cut on the femur using a surface of the cutting block to guide the cutting instrument, the cutting block being located on the anterior surface of the femur, and the cut resulting in a planer distal surface;

locating the cutting block in a first location on the planer distal surface using the navigation system;

anchoring the cutting block on the planer distal surface using pins;

re-locating the cutting block in a second, third and fourth position on the planer distal surface using the navigation system;

making an anterior cut, a posterior cut, an anterior chamfer cut and a posterior chamfer cut using a surface of the cutting block as a guide, the cutting block being anchored in the first, second, third and fourth position respectively during the making of the anterior cut, the posterior cut, the anterior chamfer cut and the posterior chamfer cut.

49. The method of claim 48, further comprising the steps of:

using the pins installed for anchoring in the first position to mechanically fix the rotation of the relocated cutting block in the second, third, and fourth position.

50. A method of resecting bone, the method comprising the steps of:

providing a cutting block adapted to resecting the bone for installation of any size prosthetic device;

locating a cutting block on the bone using a navigation system;

making a cut on the bone using a surface of the cutting block to guide the cutting instrument;

locating the cutting block in a first location on the resected surface using the navigation system;

anchoring the cutting block on the resected surface using pins;

using the pins installed for anchoring in the first position to mechanically fix the rotation of the relocated cutting block in subsequent positions for resecting the bone.