Method and apparatus for less invasive knee resection

• US 20040138670A1
• Filed: 01/15/2003
• Published: 07/15/2004
• Est. Priority Date: 01/15/2003
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Metzger, Robert
• Granted Patent: US 7,837,690 B2
• Time in Patent Office: Days
• US Class Current: 606/88
• CPC Class Codes: A61B 17/02 for holding wounds open; Tractors specula A61B1/32 ; drainage appliances for wounds A61M27/00
• CPC Class Codes: A61B 17/142 with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia

Abstract

Various tools and portions are used to perform a resection of a portion of the anatomy for preparation of the implants of a prosthetic. Various saw blades having selected geometries and shapes can be used to assist in the resection of an anatomy to provide for implantation of a prosthetic. In addition, a cutting block assembly is provided wherein a cutting block is translatably mounted on a rail. The rail is fixed relative a portion of the anatomy. Therefore, once the rail is fixed, the cutting block can move to a selected position and held there without moving the rail.

Claims

1. A guide block assembly for use in assisting resecting a boney structure, the assembly comprising:

a track member including;

a fixation section to fix said track member to the boney structure; and

a track translation section; and

a cutting block including;

a guiding section adapted to guide a cutting member; and

a guide translation section to operably engage said track translation section;

wherein said track translation section and said guide translation section operably interact to allow said cutting block to translate relative to said track member, such that said cutting block is selectively positionable in more than one position while the track member remains in a single position.

2. The guide block assembly of claim 1, wherein said fixation section includes a post extending from said track member adapted to be inserted into the boney structure.

3. The guide block assembly of claim 1, further comprising:

a screw;

wherein said fixation section includes a bore defined by said track member;

said screw adapted to be disposed in said bore to selectively fix said track member to the boney structure.

4. The guide block assembly of claim 1, wherein said track translation section includes a male dovetail extending from said track member.

5. The guide block assembly of claim 1, wherein said track translation section includes a male “

T”

extending from said track member.

6. The guide block assembly of claim 1, further comprising:

a support member extending between at least two of said fixation sections;

wherein said track translation section extends from said support member away from said fixation sections.

7. The guide block assembly of claim 1,

wherein said cutting member includes an elongated saw having a neck portion and a cutting head;

wherein said neck portion is operably engaged in said guiding section to guide said cutting head during use; and

wherein said neck portion is narrower than said cutting head.

8. The guide block assembly of claim 1, wherein said guiding section defines a bore extending through said cutting block, such that said cutting member is guided away from said track member to resect the boney structure.

9. The guide block assembly of claim 1, wherein said guide translation section includes a female dovetail to operably engage said track translation section allowing said cutting block to move relative to said track member.

10. The guide block assembly of claim 1, wherein said guide translation section includes a female “

T”

to operably engage said track translation section allowing said cutting block to move relative to said track member.

11. The guide block assembly of claim 1, wherein

said track member is selectively fixed to a single position of the boney structure;

said track translation section and said guide translation section operate to allow said cutting block to move relative said boney structure.

12. The guide block assembly of claim 1, further comprising:

a locking member, wherein said locking member selectively fixes said cutting block relative to said track member.

13. The guide block assembly of claim 1, wherein:

said track translation section is selected from one of a slot or a rail;

said guide translation section is selected from the other of said slot or said rail.

14. The guide block assembly of claim 1, further comprising:

a locking member;

wherein said track member further includes locking portions operable to be selectively engaged by said locking member;

wherein said cutting block is fixed relative to said track member when said locking member is engaged in at least one of said locking portions.

15. The cutting block assembly of claim 1, wherein said track member is fixed to a surface of the boney structure of a knee operable to allow resection of the knee.

16. The guide block assembly of claim 1, wherein said track translation section is selected to be either formed integrally with said track member, formed integrally with said cutting block, operably affixed to said track member, or operably affixed to said cutting block.

17. The guide block assembly of claim 1, wherein said guide translation section is selected to be either formed integrally with said track member, formed integrally with said cutting block, operably affixed to said track member, or operably affixed to said cutting block.

18. The guide block assembly of claim 1, wherein said track translation section includes a recess defined by said track member.

19. The guide block assembly of claim 18, wherein said recess is selected from a group including a female dovetail, a female “

T”

, or a polygon.

20. A saw blade for resecting a portion of an anatomy, the saw blade comprising:

a first end having a tool engaging section extending along a first longitudinal axis;

a second end having a cutting head defining a plurality of cutting teeth; and

extending along a second longitudinal axis; and

a neck portion interconnecting said cutting head and said tool engaging section, said first and second longitudinal axes intersecting at said neck portion;

wherein said first axis and said second axis are disposed such that said cutting head is laterally offset from said tool engaging section.

21. The saw blade of claim 20, wherein said first axis and said second axis are disposed at an angle to one another.

22. The saw blade of claim 21, wherein said angle includes at least about a 20 degree internal angle.

23. The saw blade of claim 20, wherein said neck portion includes a step, such that said cutting head portion is laterally offset from said tool engaging section, but aligned therewith.

24. The saw blade of claim 20, wherein said tool engaging section defines a bore to operably engage a power tool.

25. The saw blade of claim 20, wherein:

said neck portion includes a first width; and

said cutting head includes a second width that is greater than said first width.

26. A kit for resecting a portion of an anatomy, the kit comprising:

at least one saw blade including a cutting head and a neck portion; and

a guide block assembly including a track member and a cutting block; and

wherein said track member is selectively fixed to the portion of the anatomy to allow translation of said cutting block relative to said track member.

27. The kit of claim 26, wherein said track member includes:

a fixation section to fix said track member to a structure; and

a track translation section;

wherein said cutting block includes;

a guiding section adapted to guide a member; and

a guide translation section to operably engage said track translation section;

wherein said track translation section and said guide translation section operably engage to allow said cutting block to translate relative to said track member.

28. The kit of claim 26, wherein said at least one saw blade includes a saw blade including:

a first end having a tool engaging section extending along a first longitudinal axis;

a second end having a cutting head defining a plurality of cutting teeth; and

extending along a second longitudinal axis; and

a neck portion interconnecting said cutting head and said tool engaging section, said first and second longitudinal axes intersecting at said neck portion;

wherein said first axis and said second axis are disposed such that said cutting head is laterally offset from said tool engaging section.

29. The kit of claim 28, wherein said first axis and said second axis are formed at an angle to one another.

30. The kit of claim 26, wherein said at least one saw blade includes a saw blade including:

a tool engaging section to operably engage a motor;

a cutting head having a first width; and

a neck portion having a second width;

wherein said neck portion interconnects said cutting head and said tool engaging section;

wherein said first width is greater than said second width.

31. The kit of claim 28, wherein said first width is at least twice as great as said second width.

32. The kit of claim 26, wherein said fixation section includes a post extending from said track member adapted to be inserted into a structure of the anatomy.

33. The kit of claim 26, further comprising:

a screw;

wherein said fixation section includes a bore defined by said track member;

said screw adapted to be disposed in said bore to selectively fix said track member to the anatomy.

34. The kit of claim 26, wherein said track translation section includes a projecting member that operably engages said guide translation section such that said cutting block is able to translate relative said track member.

35. The kit of claim 26, wherein said track translation section defines a recess that is operably engaged by said guide translation section such that said cutting block is able to translate relative said track member.

36. The kit of claim 26, wherein said guiding section includes a bore extending through said cutting block, such that said saw blade is guided away from said track member to resect a portion of the anatomy.

37. The kit of claim 26, wherein

said track member is selectively fixed to a single position of the anatomy;

said track translation section and said guide translation section operate to allow said cutting block to move relative the anatomy.

38. The kit of claim 37, wherein said cutting block guides said saw blade relative said track member in a plurality of positions relative said track member.

39. A method for resecting a boney portion of an anatomy that is surrounded by soft tissue, comprising:

creating an incision in the soft tissue surrounding the boney portion;

selecting a saw blade to resect a first portion of the boney portion;

mounting a guide rail in a first rail position relative said boney portion;

positioning a cutting block in a first cutting block position relative to said guide rail to guide said saw blade; and

moving said cutting block to a second cutting block position relative to said guide rail, such that said cutting block guides said saw blade in said second cutting guide position while said guide rail remains in said first rail position.

40. The method of claim 39, wherein moving said cutting block to a second cutting block position relative said guide rail includes:

operably engaging a portion of said guide rail with said cutting block; and

sliding said cutting block relative said guide rail.

41. The method of claim 40, wherein operably engaging a portion of said guide rail with said cutting block includes:

forming a guide rail translation portion;

forming a cutting block translation portion; and

operably engaging said rail translation portion and said block translation portion such that said cutting block may translate relative said guide rail.

42. The method of claim 41, wherein said guide rail translation portion is selected from either a projection and a recesses.

43. The method of claim 42, wherein said cutting block translation portion is selected from either a projection and a recesses.

44. The method of claim 39, further comprising:

selecting a second saw blade to resect a portion of the boney portion laterally offset from a centerline of said incision;

wherein said second saw blade includes a cutting head laterally offset from a tool engaging section of said second saw blade.

46. The method of claim 39, wherein selecting a saw blade to resect a first portion of the boney portion includes:

determining a length of said incision;

selecting a neck width less than said incision length.

47. The method of claim 39, further comprising resecting a distal portion of a femur.

48. The method of claim 47, further comprising resecting one or both of a portion of an anterior of the femur and a portion of a posterior of the femur.

49. The method of claim 39, further comprising resecting a proximal portion of a tibia.

45. The method of 39, wherein mounting a guide rail in a first rail position includes:

forming a bore in the boney portion;

engaging a fixing member extending from said guide rail with said bore to selectively fix said guide rail in said first rail position.