Patent US3261530A successfully refreshed from Google Patents.
US4199824A
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US
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Intramedullary stem
Assignee: Sulzer AG
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Filing: 1978-09-13
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Granted: 1980-04-29
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Expires: 1998-09-13
Abstract
Abstract The intramedullary stem is provided with a plurality of recesses in the wide sides which are disposed in herring bone fashion. These recesses communicate with a longitudinal groove so that bone tissue material may move into the recesses and grooves during implantation. Apertures may also be provided through the stem so as to provide spaces for the tissue material to collect in a packed manner. Each recess also has a domed shaped pocket on the upper side to receive the material during implantation.
Inventors
- 👤 Peter G. Niederer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
An intramedullary stem for a bone implant having a pair of at least approximately opposite sides; a longitudinally extending groove in each said side; and a plurality of recesses disposed in each side in a herring bone pattern and terminating in said groove therein, said recesses being directed towards one end of said stem.
Claim 2
Dependent Claim
54 words
An intramedullary stem for a bone implant having a pair of at least approximately opposite sides; a longitudinally extending groove in each said side; and a plurality of recesses disposed in each side in a herring bone pattern and terminating in said groove therein, said recesses being directed towards one end of said stem.
Claim 3
Dependent Claim
24 words
An intramedullary stem as set forth in claim 1 having a plurality of longitudinally spaced apertures, each aperture communicating said grooves with each other.
Claim 4
Dependent Claim
29 words
An intramedullary stem as set forth in claim 1 wherein said recesses on one of said sides are offset relative to said recesses of the other of said sides.
Claim 5
Dependent Claim
28 words
An intramedullary stem as set forth in claim 1 wherein each recess forms an angle of from 30° to 60° with the longitudinal axis of a respective groove.
Claim 6
Dependent Claim
24 words
An intramedullary stem as set forth in claim 1 which further has unrecessed parts between said recesses, each said unrecessed part having rounded edges.
Claim 7
Dependent Claim
44 words
An intramedullary stem as set forth in claim 1 wherein each recess has a cross-sectional shape including an upwardly inclined wall extending to a flat vertical base and a curved wall extending from an upper end of said base to define a domed pocket.
Claim 8
Dependent Claim
17 words
An intramedullary stem as set forth in claim 1 of sinuous shape along a longitudinal axis thereof.
Claim 9
Dependent Claim
62 words
A hip joint endoprosethesis comprising a stem having a pair of at least approximately opposite sides; a longitudinally extending groove in each said side; and a plurality of recesses disposed in each side in a herring bone pattern and terminating in said groove therein, said recesses being directed towards one end of said stem; and a femoral head at said one end.
Claim 10
Dependent Claim
62 words
A hip joint endoprosethesis comprising a stem having a pair of at least approximately opposite sides; a longitudinally extending groove in each said side; and a plurality of recesses disposed in each side in a herring bone pattern and terminating in said groove therein, said recesses being directed towards one end of said stem; and a femoral head at said one end.
Claim 11
Dependent Claim
17 words
A hip joint endoprothesis as set forth in claim 8 wherein said stem is of blade shape.
Claim 12
Dependent Claim
64 words
A hip joint endoprosthesis as set forth in claim 8 wherein said stem has a plurality of longitudinally spaced apertures, each aperture communicating said grooves with each other, and each said recess has a cross-sectional shape including an upwardly inclined wall extending to a flat vertical base and a curved wall extending from an upper end of said base to define a domed pocket.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |