Patent US4355429A successfully refreshed from Google Patents.
US4355429A
Expired / Lapsed
US
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Slide prosthesis for the knee joint
Assignee: Osteo AG
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Filing: 1980-01-23
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Granted: 1982-10-26
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Expires: 2000-01-23
Abstract
Abstract A slide prosthesis for the knee joint is provided to be secured free of cement, the tibia members, the femur members and the surface replacement for the knee cap having anchoring pins which are provided with a saw tooth-like or bone screw-shaped profile. The tibia and knee cap members are preferably made of carbon fibre-reinforced plastics material and the femur members of aluminium oxide ceramic material. In order to assist growth of the bone to the prosthesis members, the members are coated at the corresponding points with bio-active particles, such as apatite-containing glasses, apatite particles or dealbumined bone material.
Inventors
- 👤 Heinz Mittelmeier
- 👤 Heinz Moser
- 👤 Beat Leu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:39
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2002/3895
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
143 words
A slide prosthesis for cementless attachment to a knee joint, comprising: a joint member having a joint surface and an opposite mounting surface; at least two primary securing pins extending from the mounting surface of said joint member to attach the prosthesis to the joints; a plurality of secondary securing pins extending from the mounting surface of said joint member adjacent the periphery thereof to supplement the attachment of the prosthesis to the joint, said secondary securing pins being smaller than and parallel to said primary securing pins; each of said primary and secondary securing pins having a ridged profiled with interstices for admission of bone growth so as to preclude unintentional dislodgement of the prosthesis from the knee joint; and a support plate extending from the mounting surface of said joint member and connected to and extending between said primary securing pins.
Claim 2
Dependent Claim
143 words
A slide prosthesis for cementless attachment to a knee joint, comprising: a joint member having a joint surface and an opposite mounting surface; at least two primary securing pins extending from the mounting surface of said joint member to attach the prosthesis to the joints; a plurality of secondary securing pins extending from the mounting surface of said joint member adjacent the periphery thereof to supplement the attachment of the prosthesis to the joint, said secondary securing pins being smaller than and parallel to said primary securing pins; each of said primary and secondary securing pins having a ridged profiled with interstices for admission of bone growth so as to preclude unintentional dislodgement of the prosthesis from the knee joint; and a support plate extending from the mounting surface of said joint member and connected to and extending between said primary securing pins.
Claim 3
Dependent Claim
22 words
A slide prosthesis as recited in claim 1, wherein said ridged profile of said primary and secondary securing pins is saw-tooth like.
Claim 4
Dependent Claim
22 words
A slide prosthesis as recited in claim 1, wherein said ridged profile of said primary and secondary securing pins is bone-screw shaped.
Claim 5
Dependent Claim
32 words
A slide prosthesis as recited in claim 1, further including a flange extending from the peripheral edge of said mounting surface of said joint member in the direction of said securing pins.
Claim 6
Dependent Claim
20 words
A slide prothesis as recited in claim 4, wherein said flange is segmented to form a plurality of individual teeth.
Claim 7
Dependent Claim
22 words
A slide prosthesis as recited in claim 1, wherein said mounting surface defines a plurality of cavities arranged in a honeycomb-like pattern.
Claim 8
Dependent Claim
23 words
A slide prosthesis as recited in claim 1, wherein said joint member and said primary and secondary securing pins comprise a unitary structure.
Claim 9
Dependent Claim
22 words
A slide prosthesis as recited in claim 1, wherein at least said joint member is made of a carbon fiber-reinforced plastic material.
Claim 10
Dependent Claim
21 words
A slide prosthesis as recited in claim 1, wherein at least said joint member is made of aluminium oxide ceramic material.
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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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |