| Title: |
GLENOID IMPLANT ANCHOR POST |
| Document Number: |
20100228352 |
| Publication Date: |
September 9, 2010 |
| Appl. No: |
12/398750 |
| Application Filed: |
March 05, 2009 |
| Abstract: |
A prosthesis that mechanically couples with both cancellous bone and cortical bone of a glenoid includes a head portion comprising a rear surface and an articular surface, an anchor member, and a plurality of deformable fins extending radially outward from the anchor member. The anchor member includes a distal end and a proximal end connected to the rear surface of the head portion. The plurality of deformable fins extend radially outward from the anchor member and includes at least a first proximal fin adjacent to the rear surface of the head portion positioned to engage with the cortical bone. The anchor member may also include at least one distal fin located proximate the distal end of the anchor member positioned to engage with the cancellous bone. |
| Inventors: |
Courtney, JR., Robert (Pierceton, IN, US); Mutchler, Austin W. (Warsaw, IN, US); Churchill, R. Sean (Mequon, WI, US) |
| Assignees: |
Tomier, Inc. (Edina, MN, US) |
| Claim: |
1. A prosthesis that mechanically couples with both cancellous bone and cortical bone of a glenoid, the prosthesis comprising: a head portion comprising a rear surface and an articular surface; an anchor member comprising a distal end and a proximal end connected to the rear surface of the head portion; a plurality of deformable fins extending radially outward from the anchor member including at least a first proximal fin adjacent to the rear surface of the head portion, wherein the proximal fin is positioned to engage with the cortical bone. |
| Claim: |
2. The prosthesis of claim 1, wherein the first proximal fin is offset from the rear surface a distance generally corresponding to a thickness of the cortical bone. |
| Claim: |
3. The prosthesis of claim 1, wherein the plurality of deformable fins further includes at least a first distal fin located proximate the distal end of the anchor member, wherein the first distal fin is positioned to engage with the cancellous bone. |
| Claim: |
4. The prosthesis of claim 1, wherein the first proximal fin is configured to abut cortical bone when the rear surface of the head portion engages the glenoid. |
| Claim: |
5. The prosthesis of claim 1, wherein the first proximal fin is offset from the rear surface a distance of about 1 millimeter or less. |
| Claim: |
6. The prosthesis of claim 1, wherein at least one of the plurality of deformable fins is uni-directionally deformable. |
| Claim: |
7. The prosthesis of claim 1 further comprising at least one structure located on at least one of the plurality of deformable fins that permits deformation in a first direction, but resists deformation in a second, opposite direction. |
| Claim: |
8. The prosthesis of claim 1, wherein at least one of the plurality of deformable fins includes at least one cut-out in a plane perpendicular to a central axis of the anchor member. |
| Claim: |
9. The prosthesis of claim 1, wherein the anchor member and the head portion comprise a unitary structure. |
| Claim: |
10. The prosthesis of claim 1, wherein the anchor member and the plurality of deformable fins comprise a modular structure. |
| Claim: |
11. The prosthesis of claim 9, further comprising a plurality of spacers adapted to adjust an offset between adjacent deformable fins. |
| Claim: |
12. The prosthesis of claim 1, further comprising at least one stabilizing pin extending from the rear surface of the head portion adapted to prevent rotation of the head portion relative to the glenoid. |
| Claim: |
13. The prosthesis of claim 1, further comprising a stabilizing boss positioned between the rear surface of the head portion and the first proximal fin. |
| Claim: |
14. The prosthesis of claim 1, wherein the plurality of deformable fins include at least the first proximal fin and a second proximal fin and wherein the first proximal fin and the second proximal fin have different diameters. |
| Claim: |
15. The prosthesis of claim 1, wherein the distal end of the anchor member includes a plurality of grooves. |
| Claim: |
16. A prosthesis for securement to a glenoid, the prosthesis comprising: a head portion having a first surface and a second surface; and an anchor extending from the first surface of the head portion and configured to engage the glenoid, the anchor comprising: a proximal end connected to the first surface of the head portion; a distal end opposite the proximal end; and a set of proximal fins extending radially from the proximal end of the anchor. |
| Claim: |
17. The prosthesis of claim 16, wherein the anchor further comprises a set of distal fins extending radially from the distal end of the anchor. |
| Claim: |
18. The prosthesis of claim 17, further comprising at least one structure on at least one fin of one of the sets of proximal and distal fins that permits deformation in a first direction, but resists deformation in a second, opposite direction. |
| Claim: |
19. The prosthesis of claim 17, wherein at least one fin of one of the sets of proximal and distal fins includes at least one cut-out in a plane perpendicular to a central axis of the anchor. |
| Claim: |
20. The prosthesis of claim 16, wherein the set of proximal fins are configured to abut cortical bone when the first surface of the head portion engages the glenoid. |
| Claim: |
21. The prosthesis of claim 16, wherein the anchor and the head portion are integral. |
| Claim: |
22. The prosthesis of claim 16, wherein the anchor and the head portion are separable. |
| Claim: |
23. The prosthesis of claim 22, further comprising a spacer between the set of proximal fins and the first surface of the head portion. |
| Claim: |
24. The prosthesis of claim 16, further comprising at least one stabilizing pin for maintaining the prosthesis in position relative to the glenoid when the prosthesis is secured to the glenoid. |
| Claim: |
25. The prosthesis of claim 16, further comprising a stabilizing boss positioned between the first surface of the head portion and the set of proximal fins. |
| Claim: |
26. The prosthesis of claim 16, wherein the set of proximal fins includes at least a first proximal fin and a second proximal fin and wherein the first proximal fin and the second proximal fin have different diameters. |
| Claim: |
27. The prosthesis of claim 16, wherein the distal end of the anchor includes a plurality of grooves. |
| Claim: |
28. An implant positionable between a glenoid and a humeral component, the implant comprising: a head portion having a first surface and a second surface, wherein the first surface is engageable with the glenoid and the second surface is engageable with the humeral component; and an anchor extending substantially perpendicularly from the first surface of the head portion, wherein the anchor includes a first end attached to the first surface, a second end opposite the first end and a first set of flexible flanges positioned proximate the first end of the anchor. |
| Claim: |
29. The implant of claim 28, wherein the anchor further includes a second set of flexible flanges positioned proximate the second end of the anchor. |
| Claim: |
30. The implant of claim 28, wherein the first set of flexible flanges is configured to abut cortical bone when the implant is fixed to the glenoid. |
| Claim: |
31. The implant of claim 28, wherein the head portion is integral with the anchor. |
| Claim: |
32. The implant of claim 28, wherein the head portion is separable from the anchor. |
| Claim: |
33. The implant of claim 28, wherein the implant is modular. |
| Claim: |
34. The implant of claim 29, further comprising at least one structure on at least one flange of one of the sets of first and second flexible flanges that permits deformation in a first direction, but resists deformation in a second, opposite direction. |
| Claim: |
35. The implant of claim 29, wherein at least one flange of one of the sets of first and second flexible flanges includes at least one cut-out in a plane perpendicular to a central axis of the anchor. |
| Claim: |
36. The implant of claim 28, further comprising at least one stabilizing pin for maintaining the implant in position relative to the glenoid when the implant is fixed to the glenoid. |
| Claim: |
37. The implant of claim 28, further comprising a stabilizing boss positioned between the first surface of the head portion and the first set of flexible flanges. |
| Claim: |
38. The implant of claim 28, wherein the first set of flexible flanges includes at least a first flexible flange and a second flexible flange and wherein the first flexible flange and the second flexible flange have different diameters. |
| Claim: |
39. The implant of claim 28, wherein the second end of the anchor includes a plurality of grooves. |
| Claim: |
40. A method of fixating a prosthesis to a glenoid comprising: aligning an anchor of the prosthesis with a bore formed in the glenoid, wherein the anchor includes a first deformable fin and a second deformable fin; and inserting the anchor in the bore such that when a first surface of a head portion of the prosthesis engages the glenoid, the first deformable fin is implanted within cancellous bone and the second deformable fin is implanted proximate cortical bone. |
| Claim: |
41. The method of claim 40, wherein the first and second deformable fins maintain the prosthesis within the cancellous bone. |
| Claim: |
42. The method of claim 40, further comprising aligning a stabilizing pin of the prosthesis with a hole formed in the glenoid, wherein the stabilizing pin maintains the prosthesis in position relative to the glenoid. |
| Claim: |
43. The method of claim 40, wherein the anchor has a tapered tip to facilitate insertion of the anchor into the bore. |
| Claim: |
44. The method of claim 40, wherein the first and second deformable fins are separable. |
| Claim: |
45. The method of claim 44, further comprising positioning a spacer between the first and second deformable fins to adjust an offset between the first and second deformable fins. |
| Claim: |
46. The method of claim 40, wherein the second deformable fin is offset from the first surface of the head portion of the prosthesis a distance generally corresponding to a thickness of the cortical bone. |
| Current U.S. Class: |
623/1/913 |
| Current International Class: |
61; 61 |
| Accession Number: |
edspap.20100228352 |
| Database: |
USPTO Patent Applications |
