US3869731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articulated two-part prosthesis replacing the knee joint
Assignee: University of California Berkeley
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Filing: 1973-02-14
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Granted: 1975-03-11
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Expires: 1993-02-14
Abstract
Abstract The invention provides a two-part knee prosthesis comprising components which, respectively, are implanted in the distal end surface of the femur and the proximal end surface of the tibia and which co-operate to provide a substituted articulated knee joint. The femoral component has an upwardly directed anterior fin for upward driven implantation into the distal part of the femur shaft and two transversely spaced femoral condyle replacement support members each of which has a downwardly directed bearing surface which is curved in cross section and in side elevation, the curvature in side elevation being on successively decreasing radii from the anterior portion to the posterior portion of the prosthesis. The tibial component is generally circular and flat in configuration whereby it will lie on the prepared proximal surface of the tibia and its upper surface has a circular upwardly facing groove therein which receives the two transversely spaced femoral condyle replacement support member surfaces of the femoral prosthesis.
Inventors
- 👤 Theodore R Waugh
- 👤 Richard C Smith
- 👤 Sanford H Anzel
- 👤 Caesar F Orofino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:41
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/3008; A61F2/30767; A61F2/30771; A61F2002/30878; A61F2002/30879; A61F2002/30884; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
284 words
A two-part prosthetic device for arthoplasty of the knee joint, comprising a component for replacing at least a part of the distal end of the femur and a component for replacing at least a part of the proximal end of the tibia, the femoral component comprising a unitary integrally formed device constructed and adapted to be connected to the distal end of the femur and serve in lieu of the condyle surfaces thereof, said femoral component having an upper part having an upwardly directed bone fixation element for upward implantation in the femur shaft and a lower part providing two substantially parallel transversely spaced support members which serve in lieu of the naTural condyles, each of said support members having a downwardly facing bearing surface the anterior to posterior shape of which is a continuously changing curve of constantly decreasing radii and the transverse cross sectional shape of which is a curve forming part of a circle and of shallow depth, the tibial component being disc shaped and having upper and lower surfaces and a side wall and being constructed and adapted to lie with its lower surface on and connected to the prepared plateau surface of the proximal tibia, the tibial component having an opening extending from the posterior part of its side wall to its center whereby the component is C-shaped, the tibial component having a groove in its upper surface which is C-shaped in plan, following the C-shape of the component, to receive the support members of the femoral component, the groove being of uniform cross sectional shape and shallow depth throughout its length and its bottom shaped in each transverse cross section as a curve forming part of a circle.
Claim 2
Dependent Claim
284 words
A two-part prosthetic device for arthoplasty of the knee joint, comprising a component for replacing at least a part of the distal end of the femur and a component for replacing at least a part of the proximal end of the tibia, the femoral component comprising a unitary integrally formed device constructed and adapted to be connected to the distal end of the femur and serve in lieu of the condyle surfaces thereof, said femoral component having an upper part having an upwardly directed bone fixation element for upward implantation in the femur shaft and a lower part providing two substantially parallel transversely spaced support members which serve in lieu of the naTural condyles, each of said support members having a downwardly facing bearing surface the anterior to posterior shape of which is a continuously changing curve of constantly decreasing radii and the transverse cross sectional shape of which is a curve forming part of a circle and of shallow depth, the tibial component being disc shaped and having upper and lower surfaces and a side wall and being constructed and adapted to lie with its lower surface on and connected to the prepared plateau surface of the proximal tibia, the tibial component having an opening extending from the posterior part of its side wall to its center whereby the component is C-shaped, the tibial component having a groove in its upper surface which is C-shaped in plan, following the C-shape of the component, to receive the support members of the femoral component, the groove being of uniform cross sectional shape and shallow depth throughout its length and its bottom shaped in each transverse cross section as a curve forming part of a circle.
Claim 3
Dependent Claim
284 words
A two-part prosthetic device for arthoplasty of the knee joint, comprising a component for replacing at least a part of the distal end of the femur and a component for replacing at least a part of the proximal end of the tibia, the femoral component comprising a unitary integrally formed device constructed and adapted to be connected to the distal end of the femur and serve in lieu of the condyle surfaces thereof, said femoral component having an upper part having an upwardly directed bone fixation element for upward implantation in the femur shaft and a lower part providing two substantially parallel transversely spaced support members which serve in lieu of the naTural condyles, each of said support members having a downwardly facing bearing surface the anterior to posterior shape of which is a continuously changing curve of constantly decreasing radii and the transverse cross sectional shape of which is a curve forming part of a circle and of shallow depth, the tibial component being disc shaped and having upper and lower surfaces and a side wall and being constructed and adapted to lie with its lower surface on and connected to the prepared plateau surface of the proximal tibia, the tibial component having an opening extending from the posterior part of its side wall to its center whereby the component is C-shaped, the tibial component having a groove in its upper surface which is C-shaped in plan, following the C-shape of the component, to receive the support members of the femoral component, the groove being of uniform cross sectional shape and shallow depth throughout its length and its bottom shaped in each transverse cross section as a curve forming part of a circle.
Claim 4
Dependent Claim
284 words
A two-part prosthetic device for arthoplasty of the knee joint, comprising a component for replacing at least a part of the distal end of the femur and a component for replacing at least a part of the proximal end of the tibia, the femoral component comprising a unitary integrally formed device constructed and adapted to be connected to the distal end of the femur and serve in lieu of the condyle surfaces thereof, said femoral component having an upper part having an upwardly directed bone fixation element for upward implantation in the femur shaft and a lower part providing two substantially parallel transversely spaced support members which serve in lieu of the naTural condyles, each of said support members having a downwardly facing bearing surface the anterior to posterior shape of which is a continuously changing curve of constantly decreasing radii and the transverse cross sectional shape of which is a curve forming part of a circle and of shallow depth, the tibial component being disc shaped and having upper and lower surfaces and a side wall and being constructed and adapted to lie with its lower surface on and connected to the prepared plateau surface of the proximal tibia, the tibial component having an opening extending from the posterior part of its side wall to its center whereby the component is C-shaped, the tibial component having a groove in its upper surface which is C-shaped in plan, following the C-shape of the component, to receive the support members of the femoral component, the groove being of uniform cross sectional shape and shallow depth throughout its length and its bottom shaped in each transverse cross section as a curve forming part of a circle.
Claim 5
Dependent Claim
178 words
As a new article of manufacture, a femoral prosthesis forming part of a two part knee prosthesis, comprising a unitary, one-piece device constructed and adapted to be connected to the distal end of the femur and replace the condyle surfaces thereof, said prosthesis having a lower part having two transversely spaced substantially parallel condyle replacing members each of which has a downwardly facing bearing surface which is shaped in anterior to posterior direction as a continuously changing curve of constantly decreasing radii and is shaped in transverse cross section as a curve forming part of a circle and a shallow depth, and means for connecting the prosthesis to the femur by upward driving implantation, comprising two fins extending upwardly from the upper surfaces of the condyle replacing members, respectively, and having upwardly facing upper edges, and a third fin of triangular shape extending upwardly from the upper surfaces of the condyle replacing members at the anterior parts thereof and having upwardly converging upper edges extending from the anterior parts of the upper edges of the first two fins.
Claim 6
Dependent Claim
178 words
As a new article of manufacture, a femoral prosthesis forming part of a two part knee prosthesis, comprising a unitary, one-piece device constructed and adapted to be connected to the distal end of the femur and replace the condyle surfaces thereof, said prosthesis having a lower part having two transversely spaced substantially parallel condyle replacing members each of which has a downwardly facing bearing surface which is shaped in anterior to posterior direction as a continuously changing curve of constantly decreasing radii and is shaped in transverse cross section as a curve forming part of a circle and a shallow depth, and means for connecting the prosthesis to the femur by upward driving implantation, comprising two fins extending upwardly from the upper surfaces of the condyle replacing members, respectively, and having upwardly facing upper edges, and a third fin of triangular shape extending upwardly from the upper surfaces of the condyle replacing members at the anterior parts thereof and having upwardly converging upper edges extending from the anterior parts of the upper edges of the first two fins.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |