US3924275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artifical joint prosthesis using Al{hd 2{b O{HD 3{B {0 material
Assignee: Friatec AG
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Filing: 1974-05-03
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Granted: 1975-12-09
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Expires: 1994-05-03
Abstract
Abstract Prosthesis made of biologically compatible material, such as Al2O3, can be directly implanted in bone tissue without cement and without biologically deleterious effects. At least one surface is provided by means of which the load forces are transmitted directly between the prosthesis and the bone tissues. A socket may be polygonally shaped, or may be cylindrical with a helically exterior screw thread. Exterior grooves are provided, into which bone tissue grows to firmly bond the prosthesis in place and means is provided to prevent rotation prior to bone tissue growth.
Inventors
- 👤 Gunther Heimke
- 👤 Peter Griss
- 👤 Andrian-Werburg Hanns Frhr Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:04
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/30767; A61F2/30907; A61F2/34; A61F2/3609; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30158; A61F2/30771; A61F2002/3082; A61F2002/30823; A61F2002/3085; A61F2002/30929; A61F2002/3401; A61F2002/3403; A61F2002/3625; A61F2002/3631; A61F2002/365; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00389; A61F2310/00592; A61F2310/00928; A61F2310/00934; A61L; A61L2430/00; A61L2430/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A SOCKET FOR HIP JOINT PROSTHESES FOR CEMENT-FREE IMPLANTATION IN BONE TISSUE, COMPRISING A BIOLOGICALLY COMPATIBLE MATERIAL SUCH AS COMPACTED AL2O3 CERAMIC, SAID SOCKET BEING PROVIDED WITH AN INTERNAL HEMISPHERICAL CAVITY, AN EXTERIOR UPPER LOAD BEARING SURFACE PORTION OF THE SOCKET BEING PROVIDED WITH AT LEAST ONE ELONGATED GROOVE TO PROVIDE A DIRECT PHYSICAL CONNECTION WITH BONE TISSUE GROWN AFTER IMPLANTATION AND AN EXTRIOR SURFACE PORTION INCLUDING MEANS TO PREVENT ROTATION OF THE SOCKET DIRECTLY AFTER IMPLANTATION, THE OVERALL HEIGHT OF THE SOCKET BEING LESS THAN THE DIAMETER OF THE HEMISPHERICAL CAVITY, THE TRANSVERSE DIMENSIONS OF THE UPPER PORTIONS OF THE SOCKET BEING LESS THE LARGEST DIAMETER OF THE SOCKET BUT, LARGER THAN THE DIAMETER OF THE HEMISPHERICAL CAVITY.
Claim 2
Dependent Claim
119 words
A SOCKET FOR HIP JOINT PROSTHESES FOR CEMENT-FREE IMPLANTATION IN BONE TISSUE, COMPRISING A BIOLOGICALLY COMPATIBLE MATERIAL SUCH AS COMPACTED AL2O3 CERAMIC, SAID SOCKET BEING PROVIDED WITH AN INTERNAL HEMISPHERICAL CAVITY, AN EXTERIOR UPPER LOAD BEARING SURFACE PORTION OF THE SOCKET BEING PROVIDED WITH AT LEAST ONE ELONGATED GROOVE TO PROVIDE A DIRECT PHYSICAL CONNECTION WITH BONE TISSUE GROWN AFTER IMPLANTATION AND AN EXTRIOR SURFACE PORTION INCLUDING MEANS TO PREVENT ROTATION OF THE SOCKET DIRECTLY AFTER IMPLANTATION, THE OVERALL HEIGHT OF THE SOCKET BEING LESS THAN THE DIAMETER OF THE HEMISPHERICAL CAVITY, THE TRANSVERSE DIMENSIONS OF THE UPPER PORTIONS OF THE SOCKET BEING LESS THE LARGEST DIAMETER OF THE SOCKET BUT, LARGER THAN THE DIAMETER OF THE HEMISPHERICAL CAVITY.
Claim 3
Dependent Claim
33 words
The invention defined in claim 1, wherein the upper exterior surface of said socket is provided with at least one groove having an undercut transverse profile to receive bone tissue grown after implantation.
Claim 4
Dependent Claim
34 words
The invention defined in claim 1, wherein an upper exterior surface of said socket is defined by a cylinder of revolution, and said elongated groove comprises a helical thread provided in said exterior surface.
Claim 5
Dependent Claim
34 words
The invention defined in claim 3, wherein the transverse profile of said thread includes one face disposed generally normal to the direction of the force of the load to be supported by the socket.
Claim 6
Dependent Claim
35 words
The invention defined in claim 3, wherein said means to prevent rotation comprises at least one elongated groove provided in said upper surface, and transversely intersecting at least some of the turns of said thread.
Claim 7
Dependent Claim
29 words
The invention defined in claim 3, wherein said socket is provided with a bore extending between the interior of the cavity and the upper exterior surface of the socket.
Claim 8
Dependent Claim
19 words
The invention defined in claim 3, wherein said socket includes an annular flange flaring outwardly from the hemispherical cavity.
Claim 9
Dependent Claim
37 words
The invention defined in claim 7, wherein said means to prevent rotation comprises a peg to be inserted in an axial direction through an opening provided in said annular flange and the bone tissue in alignment therewith.
Claim 10
Dependent Claim
33 words
The invention defined in claim 7, wherein the transverse profile of said elongated groove intersecting said threads is defined by a semi-cylindrical surface in axial alignment with said opening in the annular flange.
Claim 11
Dependent Claim
144 words
A socket for hip joint prostheses for cement-free implantation in bone tissue, comprising a biologically compatible material such as compacted Al2O3 ceramic, said socket being provided with an internal hemispherical cavity, an exterior upper load bearing surface portion of the socket being provided with at least one elongated groove to provide a direct physical connection with bone tissue grown after implantation and an exterior surface portion including means to prevent rotation of the socket directly after implantation, the overall height of the socket being less than the diameter of the hemispherical cavity, the transverse dimensions of the upper portions of the socket being at least substantially equal to the largest diameter of the socket and larger than the diameter of the hemispherical cavity, the exterior side surface of at least the upper portion of said socket being defined by a series of intersecting planes.
Claim 12
Dependent Claim
144 words
A socket for hip joint prostheses for cement-free implantation in bone tissue, comprising a biologically compatible material such as compacted Al2O3 ceramic, said socket being provided with an internal hemispherical cavity, an exterior upper load bearing surface portion of the socket being provided with at least one elongated groove to provide a direct physical connection with bone tissue grown after implantation and an exterior surface portion including means to prevent rotation of the socket directly after implantation, the overall height of the socket being less than the diameter of the hemispherical cavity, the transverse dimensions of the upper portions of the socket being at least substantially equal to the largest diameter of the socket and larger than the diameter of the hemispherical cavity, the exterior side surface of at least the upper portion of said socket being defined by a series of intersecting planes.
Claim 13
Dependent Claim
35 words
The invention defined in claim 10, wherein a lower portion of the exterior surface of the socket is defined by a plane intersecting an adjacent pair of said first mentioned planes and angularly related thereto.
Claim 14
Dependent Claim
14 words
The invention defined in claim 10, wherein said intersecting planes define a regular polygon.
Claim 15
Dependent Claim
13 words
The invention defined in claim 12, wherein said regular polygon has four sides.
Claim 16
Dependent Claim
32 words
The invention defined in claim 13, wherein a lower portion of the exterior surface is defined by a plane intersecting an adjacent pair of said first mentioned planes and angularly related thereto.
References Cited (Backward Citations)
US2668531A
Cited
US3774244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |