System and method for retrograde procedure

• US 20060195112A1
• Filed: 01/05/2006
• Published: 08/31/2006
• Est. Priority Date: 12/03/2002
• Status: Active Grant

• Current Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Original Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Inventors: Ek, Steven W.
• Granted Patent: US 7,914,545 B2
• Time in Patent Office: Days
• US Class Current: 606/86.00R
• CPC Class Codes: A61B 17/1617 with mobile or detachable parts
• CPC Class Codes: A61B 17/1675 for the knee
• CPC Class Codes: A61B 17/1714 for applying tendons or ligaments implements for applying tendons or ligaments A61F2/0805
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/30075 swellable, e.g. when wetted
• CPC Class Codes: A61F 2002/30228 Cylinders of elliptical or oval basis
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30881 Circumferential ribs, flanges or fins
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2210/0061 swellable
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2

Abstract

A system and method may be used for accessing an articular surface and for preparing an implant site on the articular surface. The method may include locating a portion of the articular. An access passage may be drilled towards the articular surface though bone behind the articular surface. An implant site may be excised in the articular surface relative to an axis defined by the access passage.

Claims

1. A method of replacing a portion of an articular surface comprising:

locating a portion of said articular surface;

creating an access tunnel through bone behind said articular surface, said tunnel extending toward said articular surface;

installing a guide sheath at least partially in said access tunnel; and

excising at least a portion of said articular surface.

2. A method according to claim 1, wherein locating a portion of said articular surface comprises providing a reference axis extending through said articular surface relative to said portion of said articular surface.

3. A method according to claim 2, wherein providing said reference axis comprises providing a drill guide having an cannulated shaft comprising a lumen defining an axis extending through said articular surface relative to said portion of said articular surface.

4. A method according to claim 3, wherein providing said reference axis further comprises inserting a guide pin through said cannulated shaft and into said bone behind said articular surface.

5. A method according to claim 4, wherein creating said access tunnel comprises drilling a passage over said guide pin.

6. A method according to claim 1, wherein installing said guide sheath comprises threadably engaging said guide sheath in said access tunnel.

7. A method according to claim 1, wherein excising at least a portion of said articular surface comprises inserting an excision tool at least partially through said guide sheath and deploying a cutting blade.

8. A method according to claim 7, further comprising rotating said excision tool and translating said excision tool relative to said articular surface to create an excision site.

9. An apparatus for excising a portion of an articular surface comprising:

a drive shaft; and

a cutter capable of being engaged to said drive shaft, said cutter movable between a first position extending form said drive shaft and a second position not extending from said drive shaft.

10. An apparatus according to claim 9, wherein said cutter is pivotally disposed relative to said drive shaft, said cutter pivotably movable between said first position and said second position.

11. An apparatus according to claim 10, wherein said cutter and said drive shaft comprise cooperating concave and convex features for pivotably moving said cutter between said first position and said second position.

12. An apparatus according to claim 10, wherein said cutter is coupled to said drive shaft by a pivot pin for pivotably moving said cutter between said first position and said second position.

13. An apparatus according to claim 9, further comprising a handle disposed adjacent to a proximal end of said drive shaft, said handle slidably movable along said drive shaft and independently rotatable relative to said drive shaft, sliding movement of said handle moving said cutter between said first position and said second position.

14. An apparatus according to claim 13, further comprising a pushrod coupling said cutter and said handle.

15. An apparatus according to claim 9, wherein said drive shaft comprises a cannulated shaft and said cutter is at least partially disposed within said cannulated shaft in said second position.

16. An apparatus according to claim 9, wherein said cutter is coupled to a distal end of said drive shaft.

17. An implant comprising:

an upper component comprising a load bearing surface for replacing a portion of an articular surface, said load bearing surface having a geometry based on a geometry of said portion of said articular surface, and comprising a upper locking feature; and

a lower component configured to be at least partially disposed in an implant site formed in an articular surface, said lower component comprising a recess capable of receiving at least a portion of the upper component and a lower locking featured capable of engaging said locking feature of said upper component.

18. An implant according to claim 17, wherein said recess comprises a shelf for supporting at least a portion of said upper component.

19. An articular surface implant according to claim 17, wherein said upper locking feature and said lower locking feature comprise cooperating protrusions and indentations for providing locking engagement between said upper and lower components.

20. An articular surface implant according to claim 17, wherein said implant comprises a generally cylindrical geometry, said load bearing surface being disposed at an angle relative to a longitudinal axis of said cylindrical geometry to define a generally elliptical shape.