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US4523587A
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Retention device for centering an endoprosthesis shank in a bone
Assignee: Sulzer AG
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Filing: 1983-01-24
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Granted: 1985-06-18
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Expires: 2003-01-24
Abstract
Abstract The retention device is formed of a guide piece for slidably receiving the shank of an endoprosthesis and an anchoring element for anchoring the guide piece within a bone. The guide piece and anchoring element can be pushed together or threaded together. The anchoring element is provided with slits so as to facilitate expansion upon movement of the guide piece into the anchoring element.
Inventors
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4637; A61F2/30721; A61F2/30724; A61F2/38; A61F2/4603; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30115; A61F2002/30199; A61F2002/30224; A61F2002/30235; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30354; A61F2002/30405; A61F2002/30474; A61F2002/30535; A61F2002/30579; A61F2002/30594; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30774; A61F2002/30878; A61F2002/30904; A61F2002/4638; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0063; A61F2230/0069
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
45 words
A retention device for centering an endoprosthesis shank in a bone, said retention device comprising a guide piece having a cavity extending therethrough for slidably receiving the shank in slide fit relation, and an expandable anchoring element receiving said guide piece therein in wedge-like relationship.
Claim 2
Dependent Claim
45 words
A retention device for centering an endoprosthesis shank in a bone, said retention device comprising a guide piece having a cavity extending therethrough for slidably receiving the shank in slide fit relation, and an expandable anchoring element receiving said guide piece therein in wedge-like relationship.
Claim 3
Dependent Claim
24 words
A retention device as set forth in claim 1 wherein said anchoring element has a plurality of longitudinally disposed slits to permit expansion thereof.
Claim 4
Dependent Claim
23 words
A retention device as set forth in claim 2 wherein said anchoring element is a deformable hollow cylinder having an undular circumferential surface.
Claim 5
Dependent Claim
23 words
A retention device as set forth in claim 1 wherein said anchoring element is a deformable hollow cylinder having an undular circumferential surface.
Claim 6
Dependent Claim
19 words
A retention device as set forth in claim 1 wherein said guide piece is threaded into said anchoring element.
Claim 7
Dependent Claim
52 words
A retention device for centering a shank of an endoprosthesis in a bone, said device comprising a guide piece having a central bore extending therethrough defining a cavity for slidably receiving the shank in a slide fit relation; and an expandable anchoring element having said guide piece secured therein in wedge-like relationship.
Claim 8
Dependent Claim
52 words
A retention device for centering a shank of an endoprosthesis in a bone, said device comprising a guide piece having a central bore extending therethrough defining a cavity for slidably receiving the shank in a slide fit relation; and an expandable anchoring element having said guide piece secured therein in wedge-like relationship.
Claim 9
Dependent Claim
30 words
A retention device as set forth in claim 6 wherein said guide piece is of cylindrical shape with a tapered outer surface at an end received in said anchoring element.
Claim 10
Dependent Claim
46 words
A retention device as set forth in claim 7 wherein said anchoring element has a plurality of longitudinal slits at an end circumferentially surrounding said end of said guide piece and a tapered internal surface engaging with said end of said guide piece in wedge-like relation.
Claim 11
Dependent Claim
21 words
A retention device as set forth in claim 6 wherein said guide piece and said anchoring element are in threaded engagement.
Claim 12
Dependent Claim
26 words
A retention device as set forth in claim 6 wherein said anchoring element has means on an outer circumferential surface for promoting adhesion to a bone.
Claim 13
Dependent Claim
32 words
A retention device as set forth in claim 6 wherein said guide piece and said anchoring element each include slits in at least one end face thereof for receiving an insertion tool.
Claim 14
Dependent Claim
21 words
A retention device as set forth in claim 6 wherein said guide piece and said anchoring element are made of polyethylene.
Claim 15
Dependent Claim
67 words
A retention device as set forth in claim 6 wherein said guide piece is of cylindrical shape with a tapered outer surface at an end received in said anchoring element and said anchoring element has a plurality of longitudinal slits at an end circumferentially surrounding said end of said guide piece and a tapered internal surface engaging with said end of said guide piece in wedge-like relation.
Claim 16
Dependent Claim
21 words
A retention device as set forth in claim 13 wherein said guide piece and said anchoring element are in threaded engagement.
Claim 17
Dependent Claim
32 words
A retention device as set forth in claim 14 wherein said guide piece and said anchoring element each include slits in at least one end face thereof for receiving an insertion tool.
Claim 18
Dependent Claim
52 words
In combination, a shank of an endoprosthesis; and a retention device for centering said shank in a bone, said retention device including a guide piece having a cavity extending therethrough for slidably receiving said shank in slide fit relation and an expandable anchoring element receiving said guide piece therein in wedge-like relation.
Claim 19
Dependent Claim
52 words
In combination, a shank of an endoprosthesis; and a retention device for centering said shank in a bone, said retention device including a guide piece having a cavity extending therethrough for slidably receiving said shank in slide fit relation and an expandable anchoring element receiving said guide piece therein in wedge-like relation.
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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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |