US5755803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic implant
Assignee: Biomet Manufacturing LLC
•
Filing: 1996-05-17
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Granted: 1998-05-26
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Expires: 2016-05-17
Abstract
Abstract An implant is provided for which has an outer bearing surface and an inner attachment surface. The outer bearing surface functions as a joint contact surface for a reconstructed bone joint. The inner attachment surface contacts a bone and is attached thereto. The inner attachment surface of the implant is curvilinear from the anterior to the posterior area of the femur, and is also curvilinear from the medial to the lateral areas of the femur to approximates the shape of natural femur. The resection of the femur for accommodating the implant can be properly performed by a milling device employing one or more curvilinear milling bits.
Inventors
- 👤 Timothy G. Haines
- 👤 David B. Goldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61B17/155; A61B17/16; A61B17/1662; A61B17/1675; A61B17/17; A61B17/1739; A61B17/1764; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3859; A61B17/157; A61B17/1767; A61B2017/1602
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
261 words
A prosthetic implant for attachment to a resected femur for total knee arthroplasty comprising: an outer bearing surface having medial and lateral condyles formed thereon, said medial and lateral condyles being of three dimensionally curved convex geometry to serve an articular function; said medial and lateral condyles interconnected by a patellar groove, said patellar groove being of a three dimensionally curved concave geometry; an inner contact surface in back to back disposition with said outer bearing surface, said inner contact surface including inner medial and lateral condylar areas corresponding to the medial and lateral condyles formed on the outer bearing surface, each of said inner medial and lateral condylar areas being of a three dimensionally curved concave geometry, said concave geometry curved along a medio-lateral direction and an anterior-posterior direction; each of said inner medial and lateral condyle areas interconnected by an inner patellar groove area, said inner patellar groove area being of a three dimensionally curved convex geometry, said convex geometry curved along a medio-lateral direction and an anterior posterior direction; said inner contact surface geometry further defined as a surface of revolution generated by sweeping a continuous non-collinear medio-lateral profile about a curved anterior-posterior path; said medio-lateral profile and said anterior-posterior path being planar geometries in orthogonal relation to each other; and said inner contact surface geometrically corresponding to a geometry of a resected femur having a three dimensionally curved convex medial and lateral condylar geometry, and a three dimensionally curved concave patellar groove geometry, for full contact and attachment of said inner contact surface with a resected femur.
Claim 2
Dependent Claim
261 words
A prosthetic implant for attachment to a resected femur for total knee arthroplasty comprising: an outer bearing surface having medial and lateral condyles formed thereon, said medial and lateral condyles being of three dimensionally curved convex geometry to serve an articular function; said medial and lateral condyles interconnected by a patellar groove, said patellar groove being of a three dimensionally curved concave geometry; an inner contact surface in back to back disposition with said outer bearing surface, said inner contact surface including inner medial and lateral condylar areas corresponding to the medial and lateral condyles formed on the outer bearing surface, each of said inner medial and lateral condylar areas being of a three dimensionally curved concave geometry, said concave geometry curved along a medio-lateral direction and an anterior-posterior direction; each of said inner medial and lateral condyle areas interconnected by an inner patellar groove area, said inner patellar groove area being of a three dimensionally curved convex geometry, said convex geometry curved along a medio-lateral direction and an anterior posterior direction; said inner contact surface geometry further defined as a surface of revolution generated by sweeping a continuous non-collinear medio-lateral profile about a curved anterior-posterior path; said medio-lateral profile and said anterior-posterior path being planar geometries in orthogonal relation to each other; and said inner contact surface geometrically corresponding to a geometry of a resected femur having a three dimensionally curved convex medial and lateral condylar geometry, and a three dimensionally curved concave patellar groove geometry, for full contact and attachment of said inner contact surface with a resected femur.
Claim 3
Dependent Claim
16 words
The implant of claim 1 wherein the inner contact surface geometrically approximates the outer bearing surface.
Claim 4
Dependent Claim
16 words
The implant of claim 1 wherein the inner contact surface geometrically matches the outer bearing surface.
Claim 5
Dependent Claim
20 words
The implant of claim 2 wherein the inner contact surface approximates the geometry of a non-resected bone to be reconstructed.
Claim 6
Dependent Claim
24 words
The implant of claim 1 wherein the curved surfaces of a bone are formed by at least one milling bit having a curvilinear profile.
Claim 7
Dependent Claim
25 words
The implant of claim 1 wherein the anterior-posterior curvature of the inner contact surface varies along the implant to approximate the geometry of a bone.
Claim 8
Dependent Claim
26 words
The implant of claim 1 wherein the thickness of the implant between the outer bearing surface and the inner contact surface is uniform for the implant.
Claim 9
Dependent Claim
17 words
The implant of claim 1 wherein fins are interconnected with the inner contact surface of the implant.
Claim 10
Dependent Claim
185 words
A prosthetic implant for attachment to a resected bone comprising: an outer bearing surface; an inner contact surface including inner medial and lateral condylar areas; each of said inner medial and lateral condylar areas being of a three dimensionally curved concave geometry, said concave geometry curved along a medio-lateral direction and an anterior-posterior direction; each of said inner medial and lateral condyle areas interconnected by an inner patellar groove area, said inner patellar groove area being of a three dimensionally curved convex geometry, said convex geometry curved along a medio-lateral direction and an anterior posterior direction; said inner contact surface geometry further defined as a surface of revolution generated by sweeping a continuous non-collinear medio-lateral profile about a curved anterior-posterior path; said medio-lateral profile and said anterior-posterior path being planar geometries in orthogonal relation to each other; and said inner contact surface geometrically corresponding to a geometry of a resected femur having a three dimensionally curved convex medial and lateral condylar geometry, and a three dimensionally curved concave patellar groove geometry, for full contact and attachment of said inner contact surface with a resected femur.
Claim 11
Dependent Claim
185 words
A prosthetic implant for attachment to a resected bone comprising: an outer bearing surface; an inner contact surface including inner medial and lateral condylar areas; each of said inner medial and lateral condylar areas being of a three dimensionally curved concave geometry, said concave geometry curved along a medio-lateral direction and an anterior-posterior direction; each of said inner medial and lateral condyle areas interconnected by an inner patellar groove area, said inner patellar groove area being of a three dimensionally curved convex geometry, said convex geometry curved along a medio-lateral direction and an anterior posterior direction; said inner contact surface geometry further defined as a surface of revolution generated by sweeping a continuous non-collinear medio-lateral profile about a curved anterior-posterior path; said medio-lateral profile and said anterior-posterior path being planar geometries in orthogonal relation to each other; and said inner contact surface geometrically corresponding to a geometry of a resected femur having a three dimensionally curved convex medial and lateral condylar geometry, and a three dimensionally curved concave patellar groove geometry, for full contact and attachment of said inner contact surface with a resected femur.
Claim 12
Dependent Claim
16 words
The implant of claim 9 wherein the inner contact surface geometrically approximates the outer bearing surface.
Claim 13
Dependent Claim
16 words
The implant of claim 9 wherein the inner contact surface geometrically matches the outer bearing surface.
Claim 14
Dependent Claim
20 words
The implant of claim 10 wherein the inner contact surface approximates the geometry of a non-resected bone to be reconstructed.
Claim 15
Dependent Claim
24 words
The implant of claim 9 wherein the curved surfaces of a bone are formed by at least one milling bit having a curvilinear profile.
Claim 16
Dependent Claim
25 words
The implant of claim 9 wherein the anterior-posterior curvature of the inner contact surface varies along the implant to approximate the geometry of a bone.
Claim 17
Dependent Claim
26 words
The implant of claim 9 wherein the thickness of the implant between the outer bearing surface and the inner contact surface is uniform for the implant.
Claim 18
Dependent Claim
17 words
The implant of claim 9 wherein fins are interconnected with the inner contact surface of the implant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |