US4988359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing stem for an endoprosthesis
Assignee: Sulzer AG
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Filing: 1989-03-11
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Granted: 1991-01-29
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Expires: 2009-03-11
Abstract
Abstract The stem of the prosthesis is fixed in a medullated bone by means of a plurality of spacers which are distributed over the length of the stem. The spacers serve to stabilize the stem over the entire length of the stem within the bone cavity. Bone cement is charged into each peripheral opening defined between a pair of spacers via bores drilled transversely through the cortex of the bone in stages from the distal end toward the proximal end.
Inventors
- 👤 Otto Frey
- 👤 Koch: Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:07
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30724; A61F2/32; A61F2/36; A61F2/3662; A61F2/30723; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/302; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2002/3678; A61F2002/368; A61F2/46; A61F2002/4631; A61F2230/00; A61F2230/0063; A61F2230/0065
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
In combination a fixing stem for an endoprosthesis for fixing in a medullated bone; and a plurality of peripherally closed spacers of wire mesh longitudinally spaced along and peripherally about said stem for spacing said stem from a medullated bone to define a plurality of peripheral spaces between said stem and the bone to individually receive a transversely delivered charge of bone cement therein.
Claim 2
Dependent Claim
64 words
In combination a fixing stem for an endoprosthesis for fixing in a medullated bone; and a plurality of peripherally closed spacers of wire mesh longitudinally spaced along and peripherally about said stem for spacing said stem from a medullated bone to define a plurality of peripheral spaces between said stem and the bone to individually receive a transversely delivered charge of bone cement therein.
Claim 3
Dependent Claim
13 words
The combination as set forth in claim 1 wherein each spacer is deformable.
Claim 4
Dependent Claim
26 words
The combination as set forth in claim 1 wherein each spacer is of trough-shaped cross-section having an opening facing in a proximal direction of the stem.
Claim 5
Dependent Claim
20 words
The combination as set forth in claim 1 wherein said spacers are disposed in non-uniform spaced relation from each other.
Claim 6
Dependent Claim
18 words
The combination as set forth in claim 4 wherein at least one spacer has a variable peripheral width.
Claim 7
Dependent Claim
18 words
The combination as set forth in claim 1 wherein at least one spacer has a variable peripheral width.
Claim 8
Dependent Claim
55 words
In combination a fixing stem for an endoprosthesis; and a plurality of peripherally closed spacers of deformable wire mesh spaced longitudinally of said stem to space said stem from a medullated bone to define a plurality of peripheral spaces between said stem and the bone to individually receive a transversely delivered charge of bone cement.
Claim 9
Dependent Claim
55 words
In combination a fixing stem for an endoprosthesis; and a plurality of peripherally closed spacers of deformable wire mesh spaced longitudinally of said stem to space said stem from a medullated bone to define a plurality of peripheral spaces between said stem and the bone to individually receive a transversely delivered charge of bone cement.
Claim 10
Dependent Claim
26 words
The combination as set forth in claim 7 wherein each spacer has a trough-shaped cross-section having an opening facing in a proximal direction of said stem.
Claim 11
Dependent Claim
18 words
The combination as set forth in claim 8 wherein at least one spacer has a variable peripheral width.
Claim 12
Dependent Claim
30 words
The combination as set forth in claim 8 wherein said spacers are disposed in non-uniform spaced relation from each other and at least one spacer has a variable peripheral width.
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) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |