US4769039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tibial implant for a knee prosthesis
Assignee: Sulzer AG
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Filing: 1986-08-27
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Granted: 1988-09-06
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Expires: 2006-08-27
Abstract
Abstract The tibial implant is made with two truncoconical faces which extend from a common plane for different distances. The differential extent permits implantation in a natural tibia having sockets which have different degrees of wear, thus avoiding unnecessary loss of healthy bone during a resection procedure. The truncoconical faces are provided on metal bowls which can be welded together along a common plane and which together form a support to receive a plastic member providing the joint sliding surfaces and providing a pair of expansion elements for expanding barbed hollow bodies extending from the metal bowls.
Inventors
- 👤 Willi Horber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/389
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A tibial implant for a knee prosthesis, said implant comprising a tibial sliding surface on one side; at least two anchoring pins extending from an opposite side for securement in a tibia; and a pair of obliquely extending truncoconical faces on said opposite side, each said face being disposed concentrically of a respective pin and extending perpendicularly from a common reference plane a distance different from the other of said pair of faces to permit limited resection of a tibia for implanting the implant.
Claim 2
Dependent Claim
84 words
A tibial implant for a knee prosthesis, said implant comprising a tibial sliding surface on one side; at least two anchoring pins extending from an opposite side for securement in a tibia; and a pair of obliquely extending truncoconical faces on said opposite side, each said face being disposed concentrically of a respective pin and extending perpendicularly from a common reference plane a distance different from the other of said pair of faces to permit limited resection of a tibia for implanting the implant.
Claim 3
Dependent Claim
35 words
A tibial implant as set forth in claim 1 further comprising a first member having said sliding surface thereon and a second member having said faces thereon and a recess receiving said first member therein.
Claim 4
Dependent Claim
29 words
A tibial implant as set forth in claim 2 wherein said second member includes a pair of circular cylindrical truncoconical elements having flat faces abutting and integrally secured together.
Claim 5
Dependent Claim
77 words
A tibial implant as set forth in claim 1 comprising a first member having said sliding surface thereon and including a pair of circular cylindrical projections extending towards said opposite side and a pair of expansion elements, each expansion element being concentric to a respective projection and said second member having said truncoconical faces thereon and including a pair of recesses respectively receiving said projections and a pair of expandable hollow bodies respectively receiving said expansion elements.
Claim 6
Dependent Claim
24 words
A tibial implant as set forth in claim 4 wherein each said hollow body and a received expansion element defines a closed anchoring pin.
Claim 7
Dependent Claim
25 words
A tibial implant as set forth in claim 4 wherein said first member is made of plastic and said second member is made of metal.
Claim 8
Dependent Claim
102 words
A tibial implant for knee prosthesis comprising a first member having a tibial sliding surface on one side, a pair of projections extending towards an opposite side and a pair of expansion elements, each element extending from a respective projection; and a second member having a pair of recesses respectively receiving said projections, a pair of obliquely extending truncoconical faces, each face extending perpendicularly from a common reference plane a distance different from the other face and a pair of hollow bodies, each hollow body being concentric to and extending from a respective truncoconical face and receiving a respective expansion element therein.
Claim 9
Dependent Claim
102 words
A tibial implant for knee prosthesis comprising a first member having a tibial sliding surface on one side, a pair of projections extending towards an opposite side and a pair of expansion elements, each element extending from a respective projection; and a second member having a pair of recesses respectively receiving said projections, a pair of obliquely extending truncoconical faces, each face extending perpendicularly from a common reference plane a distance different from the other face and a pair of hollow bodies, each hollow body being concentric to and extending from a respective truncoconical face and receiving a respective expansion element therein.
Claim 10
Dependent Claim
29 words
A tibial implant as set forth in claim 7 wherein said second member includes a pair of circular cylindrical truncoconical elements having flat faces abutting and integrally secured together.
Claim 11
Dependent Claim
25 words
A tibial implant as set forth in claim 7 wherein said first member is made of plastic and said second member is made of metal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |