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US4978357A Expired / Lapsed US ⏱️ 0.0 years remaining

Endoprosthesis

Assignee: PROF DR MED VOLKMAR GOYMANN
•
Filing: 1988-06-10
•
Granted: 1990-12-18
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Expires: 2008-06-10
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Abstract

Abstract An endoprosthesis is equipped with a collar and a prosthesis shaft and is adapted to be anchored longitudinally in a bone without the use of cement. A hip endoprosthesis can be constructed for anchorage in the proximal femur, in which the prosthesis shaft is composed of a plurality of parallel interconnected thin plates which are configured as plate-shaped partial faces and which have peripheral cutting edges which face away from the prosthesis collar. A tibial plateau prosthesis can be similary constructed, and includes a tibial plateau and a supporting structure formed of thin plates which extend in a common direction and which are interconnected. Both types of prosthesis can be driven into the bone without destruction of existing bone tissue and without removal of spongiosa. A shaft structure is employed which ensures the firmest possible anchorage in the medullary space, with a porous surface being provided to facilitate the in-growth of spongy material to thereby increase the strength of the anchorage of the prosthesis shaft.

Inventors

  • 👤 Volkmar Goymann
  • 👤 Emmanuel Anapliotis
  • 👤 Curt Kranz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 05:46
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/389; A61F2/32; A61F2/36; A61F2/3662; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30131; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2002/30789; A61F2002/30841; A61F2002/30845; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2002/3678; A61F2002/368; A61F2002/369; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 126 words
A prosthesis for implanting into a prepared first bone, comprising: a plateau having upper and lower surfaces, at least one bearing member configured to receive cooperating condyles of a second bone, said bearing member being disposed on said upper surface of the plateau; a U-shaped anchoring element connected to said lower surface of the plateau, said U-shaped anchoring element including two elongated side plates extending outwardly and generally transversely to said lower surface wherein each of said side plates having bottom, front and rear edges; and a connecting plate spaced a predetermined distance from said lower surface and extending between and connecting said side plates, said connecting plate and said side plates having means for cutting into the first bone upon insertion of the prosthesis therein.
Claim 2
Dependent Claim 126 words
A prosthesis for implanting into a prepared first bone, comprising: a plateau having upper and lower surfaces, at least one bearing member configured to receive cooperating condyles of a second bone, said bearing member being disposed on said upper surface of the plateau; a U-shaped anchoring element connected to said lower surface of the plateau, said U-shaped anchoring element including two elongated side plates extending outwardly and generally transversely to said lower surface wherein each of said side plates having bottom, front and rear edges; and a connecting plate spaced a predetermined distance from said lower surface and extending between and connecting said side plates, said connecting plate and said side plates having means for cutting into the first bone upon insertion of the prosthesis therein.
Claim 3
Dependent Claim 39 words
A prosthesis as claimed in claim 1, wherein said connecting plate is a first connecting plate and said two plates have respective rear edges, and further comprising a second connecting plate connecting said rear edges of said two plates.
Claim 4
Dependent Claim 31 words
A prosthesis as claimed in claim 2, wherein said second connecting plate has a plurality of perforations for permitting bone growth into said plurality of perforations and between said two plates.
Claim 5
Dependent Claim 22 words
A prosthesis as claimed in claim 2, wherein said second connecting plate is additionally connected to said lower side of said plateau.
Claim 6
Dependent Claim 23 words
A prosthesis as claimed in claim 1, wherein said two plates are substantially parallel and spaced apart a predetermined distance from each other.
Claim 7
Dependent Claim 20 words
A prosthesis as claimed in claim 1, wherein said front edge of said connecting plate has a concave curved shape.
Claim 8
Dependent Claim 25 words
A prosthesis as claimed in claim 6, wherein said front edge of said connecting plate is continuous with the front edges of said two plates.

References Cited (Backward Citations)

DE2356464A1 Cited
US4287617A Cited
EP0065481A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-12-17 1994-06-18 1994-12-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-12-17 1998-06-18 1998-12-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-12-17 2002-06-18 2002-12-18 $7700.00 Window Closed / Lapsed

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