Patent US4908032A successfully refreshed from Google Patents.
US4908032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reconstruction prosthesis
Assignee: Waldemar Link GmbH and Co KG
•
Filing: 1988-03-02
•
Granted: 1990-03-13
•
Expires: 2008-03-02
Abstract
Abstract A hip prosthesis has a stem which is to be anchored in the femur bone and has a transverse surface for support on a subtrochanteric bone surface. The transverse surface comprises a plurality of support parts which engage in the bone at mutual spacings and which preferably radiate in the form of a star from a ring.
Inventors
- 👤 Arnold Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:14
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3607; A61F2/30721; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30433; A61F2002/30476; A61F2002/30494; A61F2002/30535; A61F2002/30537; A61F2002/3055; A61F2002/30599; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2220/00; A61F2220/0025; A61F2220/0041; A61F2250/00; A61F2250/0058; A61F2250/006; A61F2250/0063
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A hip prosthesis to be supported by a transverse subtrochanteric bone surface located intermediate upper and lower portions of the femur bone, comprising: a stem having upper and lower portions, for positioning longitudinally within respective upper and lower portions of the femur bone; support means associated with the stem to extend transversely from the stem and between the upper and lower bone portions, the support means having upper and lower bone engaging surfaces and an external diameter sized to be substantially no larger than the external diameter of the bone portions, the lower bone engaging surface being adapted to transfer longitudinal forces from the upper portion of the stem through said bone surface to the lower bone portion, and to define with said upper bone engaging surface a plurality of interspaces for bone growth between the upper and lower bone portions.
Claim 2
Dependent Claim
141 words
A hip prosthesis to be supported by a transverse subtrochanteric bone surface located intermediate upper and lower portions of the femur bone, comprising: a stem having upper and lower portions, for positioning longitudinally within respective upper and lower portions of the femur bone; support means associated with the stem to extend transversely from the stem and between the upper and lower bone portions, the support means having upper and lower bone engaging surfaces and an external diameter sized to be substantially no larger than the external diameter of the bone portions, the lower bone engaging surface being adapted to transfer longitudinal forces from the upper portion of the stem through said bone surface to the lower bone portion, and to define with said upper bone engaging surface a plurality of interspaces for bone growth between the upper and lower bone portions.
Claim 3
Dependent Claim
28 words
A prosthesis as claimed in claim 1, wherein the support means is a rigid member separate from the stem (1) and introducible into the bone before the stem.
Claim 4
Dependent Claim
32 words
A prosthesis as claimed in claim 1, wherein the support means includes a ring, and the interspaces are defined by ribs radiating in the form of a star from the ring (15).
Claim 5
Dependent Claim
22 words
A prosthesis as claimed in claim 3, wherein the stem (1) includes a contact surface (5) which interacts with the ring (15).
Claim 6
Dependent Claim
26 words
A prosthesis as claimed in claim 4, wherein annular shims (19) are provided which can be inserted between the contact surface (5) and the ring (15).
Claim 7
Dependent Claim
41 words
A prosthesis as claimed in claim 1, wherein the prosthesis includes a neck part (6) carrying a prosthesis head (7) and the neck part is releasably joined via adapters (14) of adjustable length to the upper portion of the stem (1).
Claim 8
Dependent Claim
32 words
A prosthesis as claimed in claim 2, wherein the support means includes a ring, and the interspaces are defined by ribs radiating in the form of a star from the ring (15).
Claim 9
Dependent Claim
41 words
A prosthesis as claimed in claim 2, wherein the prosthesis includes a neck part (6) carrying a prosthesis head (7) and the neck part is releasably joined via adapters (14) of adjustable length to the upper portion of the stem (1).
References Cited (Backward Citations)
US2785673A
Cited
US4077070A
Cited
SU762871A1
Cited
US4227518A
Cited
DE3205577A1
Cited
US4549319A
Cited
DE3336005A1
Cited
DE3340767A1
Cited
US4783192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |