Implant

• US 6,165,221 A
• Filed: 07/19/1999
• Issued: 12/26/2000
• Est. Priority Date: 11/14/1996
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Orthopaedics Ag (Smith & Nephew PLC)
• Original Assignee: Plus Endoprothetik AG
• Inventors: Schmotzer, Hans
• Primary Examiner(s): Philogene, Pedro
• Application Number:
  US09/308,457
• Time in Patent Office: 526 Days
• Field of Search: 623/16.11, 623/18.11, 623/20.14, 623/20.18, 623/20.21, 623/20.3, 623/20.31, 623/20.32, 623/22.11, 623/23.11
• US Class Current: 623/20.11
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2002/3895 unicompartimental

Abstract

An implant for placing on a plateau or resection surface of a joint bone includes at least one skidshaped cup having a joint seating surface, a ventral and a dorsal end. The joint seating surface extends in a longitudinal direction and has first and second curvature radii. The first curvature radius is transverse to the longitudinal direction and, at least in a coronal area, larger than the second curvature radius transverse to the longitudinal direction and in an area, which is loaded when the joint is fully bent. The first curvature radius continuously merges into the second curvature radius within a transitional area which extends over an angular range between about 30° and about 70°.

Claims

1. An implant for placing on a plateau or resection surface of a joint bone, comprising:

at least one skidshaped cup having a joint seating surface, a ventral and a dorsal end, the joint seating surface extending in a longitudinal direction and having first and second curvature radii, the first curvature radius being transverse to the longitudinal direction and, at least in a coronal area, being larger than the second curvature radius transverse to the longitudinal direction and in an area, which is loaded when the joint is fully bent, wherein the first curvature radius continuously merges into the second curvature radius within a transitional area which extends over an angular range between about 30° and

about 70°

.

2. The implant of claim 1, wherein the transitional area extends over an angular range between about 40°

and about 60°

.

3. The implant of claim 1, wherein the transitional area starts in an area of the skidshaped cup which is loaded when the joint of fully bent.

4. The implant of claim 1, wherein the transitional area starts in an area which is slightly displaced in the direction of the coronal area.

5. The implant of claim 1, wherein the skidshaped cup is pointed at the ventral end facing away from the loaded joint seating surface when the joint is fully bent.

6. The implant of claim 1, wherein the skidshaped cup comprises at a side of the joint bone at least one pin which is insertable into the joint bone and mountable therein.

7. The implant of claim 1, wherein the skidshaped cup comprises at a side of the joint bone means for anchoring insertable into the bone and mountable therein.

8. The implant of claim 1, wherein the skidshaped cup comprises at a side of the joint bone a central web which extends at least from ventral to dorsal in the longitudinal direction.

9. The implant of claim 1, wherein the skidshaped cup comprises a circular peripheral edge, and at least one element selected from a group including pockets, cutouts and recesses within the circular peripheral edge.

10. The implant of claim 9, wherein the skidshaped cup comprises a circular peripheral edge, and at least one element selected from a group including pockets, cutouts and recesses between the circular peripheral edge and the central web.

11. The implant of claim 1, comprising a single skidshaped cup which serves as a uni-condyle slide.

12. The implant of claim 1, comprising two parallel skidshaped cups which form a bi-condyle slide.