US5108450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Femur head prosthesis
Assignee: Sulzer AG
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Filing: 1991-09-06
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Granted: 1992-04-28
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Expires: 2011-09-06
Abstract
Abstract A femur head prosthesis consists of a shaft having several plate springs fixed unilaterally, which are enclosed by a thin-walled and deformable shell body. The shell body is connected to the shaft edge and seals the enclosed volume so as to be impermeable to air. The plate springs are laminated springs, which are separated by slits. The depth of the slits towards the proximal end leaves a narrow unslit yoke part. When an intermittent load occurs, a slight bending of the yoke part results and, within the yoke part, a slight displacement of the plate springs with respect to one another to result in a damping and a non-linear increase in the compressive force.
Inventors
- 👤 Willi Horber
- 👤 Rudolf Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30565; A61F2002/30571; A61F2002/30579; A61F2002/30589; A61F2002/30594; A61F2002/30602; A61F2/30721; A61F2/30734; A61F2002/30738; A61F2/30767; A61F2/30907; A61F2002/30919
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
A femur head prosthesis comprising a shaft having an edge and a plurality of plate springs extending distally from said edge and disposed in spaced relation to each other; a neck extending proximally from said edge of said shaft; a ball extending from said neck; and a thin-walled deformable shell body connected to said edge of said shaft and surrounding said springs in sealed relation.
Claim 2
Dependent Claim
65 words
A femur head prosthesis comprising a shaft having an edge and a plurality of plate springs extending distally from said edge and disposed in spaced relation to each other; a neck extending proximally from said edge of said shaft; a ball extending from said neck; and a thin-walled deformable shell body connected to said edge of said shaft and surrounding said springs in sealed relation.
Claim 3
Dependent Claim
22 words
A prosthesis as set forth in claim 1 wherein said springs are laminated springs and are spaced apart to define parallel slits.
Claim 4
Dependent Claim
22 words
A prosthesis as set forth in claim 2 wherein said springs are deformable inwardly of said shaft to contact an adjacent spring.
Claim 5
Dependent Claim
25 words
A prosthesis as set forth in claim 2 wherein said slits are of variable depth longitudinally of said shaft to form springs of variable length.
Claim 6
Dependent Claim
46 words
A prosthesis as set forth in claim 1 wherein a plurality of said springs on a medial side of said shaft have chamfered terminal surfaces to slidingly engage and enlarge said shell during a displacement of said shaft in a distal direction in a bone cavity.
Claim 7
Dependent Claim
29 words
A prosthesis as set forth in claim 1 wherein said shell is creped at least in a region of said springs to follow movements of said springs during implantation.
Claim 8
Dependent Claim
24 words
A prosthesis as set forth in claim 1 wherein said plate springs are disposed at an angle to a longitudinal axis of said shaft.
Claim 9
Dependent Claim
19 words
A prosthesis as set forth in claim 1 wherein said plate springs are spaced apart from medial to lateral.
Claim 10
Dependent Claim
28 words
A prosthesis As set forth in claim 1 which further comprises a narrow unslit yoke part integral with said edge and on a lateral side of said shaft.
Claim 11
Dependent Claim
70 words
A femur head prosthesis comprising a shaft having a base, a plurality of plate springs extending distally from said base and disposed in spaced relation to each other to define slits therebetween and a narrow unslit yoke part integral with said base and on a lateral side of said shaft; and a thin-walled deformable shell body connected to said base of said shaft and surrounding said springs in sealed relation.
Claim 12
Dependent Claim
70 words
A femur head prosthesis comprising a shaft having a base, a plurality of plate springs extending distally from said base and disposed in spaced relation to each other to define slits therebetween and a narrow unslit yoke part integral with said base and on a lateral side of said shaft; and a thin-walled deformable shell body connected to said base of said shaft and surrounding said springs in sealed relation.
Claim 13
Dependent Claim
46 words
A prosthesis as set forth in claim 10 wherein a plurality of said springs on a medial side of said shaft have chamfered terminal surfaces to slidingly engage and enlarge said shell during a displacement of said shaft in a distal direction in a bone cavity.
Claim 14
Dependent Claim
29 words
A prosthesis as set forth in claim 11 wherein said shell is creped at least in a region of said springs to follow movements of said springs during implantation.
References Cited (Backward Citations)
FR2425237A1
Cited
US4266302A
Cited
DE3122730A1
Cited
US4919665A
Cited
EP0145938B1
Cited
US4690489A
Cited
US4938770A
Cited
DE3904528A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |