System and method for repairing articular surfaces

Patent metadata

Field	Value
Publication number	US-10624748-B2
Application number	US-201615388808-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Mar 7, 2014
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A joint replacement system for repairing an articular surface of a first bone of a joint includes an anchor portion and an implant portion. The anchor portion includes an anchor to be secured to the bone, and an anchor fixation head including a bone-facing surface (BFS) extending radially outward from the anchor and an implant facing surface (IFS) extending from a periphery of the BFS. The implant portion is formed from a material (e.g., CoCr) more dense than the material of the anchor portion (e.g., Ti) and includes a fixation cavity to receive at least a portion of the anchor fixation head (AFH), the fixation cavity includes an anchor facing surface (AFS) configured to form a frictional connection with the IFS, and a load bearing surface having a contour for articulating against a cooperating articulating surface of a second bone of the joint.

First claim

What is claimed is:

1. A joint replacement system for repairing at least a first articular surface of a first bone of a joint, said system comprising:
a first implant system comprising:
an anchor portion formed from at least a first material, said anchor portion comprising:
a first anchor configured to be secured to said bone; and
an anchor fixation head including a bone-facing surface and an implant facing surface, wherein said bone-facing surface extends radially outward from said anchor, and wherein said implant facing surface extends from a periphery of said bone facing surface and includes a first mating surface; and

an implant portion formed from at least a second material more dense than said first material, said implant portion comprising:
a fixation cavity configured to receive at least a portion of said anchor fixation head, said fixation cavity including an anchor facing surface extending from an opening thereof, said anchor facing surface including a second mating surface configured to form a frictional connection with said first mating surface; and
a first load bearing surface having a contour for articulating against a cooperating, second articulating surface associated with a second bone of said joint;

wherein:
said fixation cavity defines a volume Vr that is greater than or equal to 50% of a total volume Vi of said implant portion; and/or
said anchor fixation head defines a volume Vh that is greater than or equal to 50% of said total volume Vi of said implant portion.

2. The joint replacement system of claim 1 , further comprising:
a second implant system comprising:
a second implant having a second load bearing surface configured to articulate against said first load bearing surface; and
a second anchor configured to be secured into said second bone, wherein said second anchor is configured to be secured to said second implant.

3. The joint replacement system of claim 2 , wherein said second implant and said second anchor include a first and a second fixation element, respectively.

4. The joint replacement system of claim 3 , wherein said first and said second fixation elements are configured to form tapered connection therebetween.

5. The joint replacement system of claim 4 , wherein said first and said second fixation elements comprise a tapered cavity and a tapered protrusion configured to form tapered connection therebetween.

6. The joint replacement system of claim 3 , wherein said first and said second fixation elements are configured to form a snap-fit connection therebetween.

7. The joint replacement system of claim 1 , wherein said first load bearing surface is configured to replace substantially the entire first articular surface of said first bone.

8. The joint replacement system of claim 7 , wherein said second load bearing surface is configured to replace substantially an entire second articular surface of said second bone.

9. The joint replacement system of claim 1 , wherein said first load bearing surface is configured to replace a portion of said first articular surface.

10. The joint replacement system of claim 1 , wherein said first load bearing surface has a contour based on a plurality of overlapping excision sites.

11. The joint replacement system of claim 1 , wherein said first load bearing surface has a contour defining a socket.

12. The joint replacement system of claim 11 , and wherein said second load bearing surface has a contour defining a generally hemispherical ball configured to articulate, at least in part, in said socket.

13. The joint replacement system of claim 1 , and wherein said first load bearing surface has a contour defining a generally hemispherical ball.

14. The joint replacement system of claim 1 , wherein said first material comprises steel, titanium, or an alloy thereof.

15. The joint replacement system of claim 1 , wherein said second material comprises cobalt-chromium (CoCr).

16. The joint replacement system of claim 1 , wherein said volume Vr is greater than or equal to 50% of said total volume Vi of said implant portion.

17. The joint replacement system of claim 1 , wherein said volume Vh is greater than or equal to 50% of said total volume Vi of said implant portion.

18. The joint replacement system of claim 1 , wherein said opening of said fixation cavity has a cross-section that is greater than a cross-section of said anchor.

19. The joint replacement system of claim 18 , wherein said opening includes a maximum radial distance Do from a longitudinal axis of said anchor portion that is larger than a maximum radial distance Da of said anchor.

20. The joint replacement system of claim 1 , wherein a maximum thickness Ti of said implant portion is less than a maximum thickness Th of said anchor fixation head.

21. The joint replacement system of claim 1 , wherein said anchor fixation head has a cross-section that is greater than a cross-section of said anchor.

22. The joint replacement system of claim 21 , wherein said implant portion includes at least one bone-facing surface extending radially outward from at least a portion of said opening of said fixation cavity.

23. The joint replacement system of claim 21 , wherein said anchor facing surface has a generally hemispherical shape.

24. The joint replacement system of claim 1 , wherein said anchor fixation head and said anchor are a unitary structure.

25. The joint replacement system of claim 1 , wherein said implant facing surface of said fixation cavity has a shape that generally corresponds to the shape of implant facing surface of said anchor fixation head.

26. The joint replacement system of claim 1 , wherein said first and said second mating surfaces have a tapered shape.

27. The joint replacement system of claim 1 , wherein said anchor fixation head comprises at least one fixation member opening extending therethrough, said fixation member opening configured to receive a fixation member.

28. The joint replacement system of claim 27 , further comprising said fixation member, and wherein said fixation member comprises a screw.

29. The joint replacement system of claim 1 , wherein said first material comprises steel, titanium, or an alloy thereof, and wherein said second material comprises cobalt-chromium (CoCr).

30. A joint replacement system for repairing at least a first articular surface of a first bone of a joint, said system comprising:
a first implant system comprising:
an anchor portion formed from at least a first material, said anchor portion comprising:
a first anchor configured to be secured to said bone; and
an anchor fixation head including a bone-facing surface and an implant facing surface, wherein said bone-facing surface extends radially outward from said anchor, and wherein said implant facing surface extends from a periphery of said bone facing surface and includes a first mating surface; and

an implant portion formed from at least a second material more dense than said first material, said implant portion comprising:
a fixation cavity configured to receive at least a portion of said anchor fixation head, said fixation cavity including an anchor facing surface extending from an opening thereof, said anchor facing surface including a second mating surface configured to form a frictional connection with said first mating surface and said opening having a cross-s

Assignees

• Arthrosurface Inc

Inventors

• Ek Steven W
• Miniaci Anthony
• Brightman Timothy

Classifications

• A61F2002/30901

  longitudinally · CPC title

• A61F2/4637

  for connecting or disconnecting two parts of a prosthesis · CPC title

• A61F2/42

  for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes · CPC title

• A61F2/4081

  Glenoid components, e.g. cups · CPC title

• A61F2002/3085

  with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface · CPC title