US4728334A
Expired / Lapsed
US
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Shaft for hip joint prosthesis
Assignee: Zimmer GmbH
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Filing: 1986-08-29
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Granted: 1988-03-01
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Expires: 2006-08-29
Abstract
Abstract In a femur component of a hip joint prosthesis, a straight shaft member is formed at least over the length of a proximal portion thereof located at the proximal end of the shaft member with a conical configuration which widens taken in a direction toward the proximal end of the shaft member and with a narrowing configuration taken from the lateral side to the medial side of the shaft member.
Inventors
- 👤 Lorenzo Spotorno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/46; A61F2/4603; A61F2/4607; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30156; A61F2002/30158; A61F2002/30199; A61F2002/30205; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30795; A61F2002/30807; A61F2002/3081; A61F2002/3082; A61F2002/30827; A61F2002/30828; A61F2002/30878; A61F2002/30879; A61F2002/30884; A61F2002/30891; A61F2002/30892; A61F2/3609; A61F2002/3625; A61F2002/365; A61F2002/4619; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0023; A61F2230/0026; A61F2230/0063; A61F2230/0067; A61F2250/00; A61F2250/0014; A61F2250/0026
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
163 words
In a femur component of a hip joint prosthesis consisting essentially of a straight shaft member defining a longitudinal axis, having a distal end, a proximal end, an anterior side, a posterior side, a medial side and a lateral side, said shaft member widening conically from said distal to said proximal end and from said medial to said lateral side, the improvement comprising said shaft member having in a proximal portion a plurality of distinct blades, having recesses therebetween wherein said blades and resecces are disposed substantially parallel to said longitudinal axis, each said blade having a broad surface extending a distance perpendicularly to the anterior posterior plane of said shaft and wherein said distance and depth of each of said blade and recess increases in a direction from said medial to said lateral side to yield a generally conical configuration; and said recesses between said blades having a depth which gradually decreases in a direction from said lateral to said medial side.
Claim 2
Dependent Claim
163 words
In a femur component of a hip joint prosthesis consisting essentially of a straight shaft member defining a longitudinal axis, having a distal end, a proximal end, an anterior side, a posterior side, a medial side and a lateral side, said shaft member widening conically from said distal to said proximal end and from said medial to said lateral side, the improvement comprising said shaft member having in a proximal portion a plurality of distinct blades, having recesses therebetween wherein said blades and resecces are disposed substantially parallel to said longitudinal axis, each said blade having a broad surface extending a distance perpendicularly to the anterior posterior plane of said shaft and wherein said distance and depth of each of said blade and recess increases in a direction from said medial to said lateral side to yield a generally conical configuration; and said recesses between said blades having a depth which gradually decreases in a direction from said lateral to said medial side.
Claim 3
Dependent Claim
48 words
A femur component according to claim 1, wherein said shaft member is formed with a transitional portion at the distal end of said proximal range H, said femur component being formed with recesses extending in said proximal range H on said side flanks proximal to said transitional portion.
Claim 4
Dependent Claim
29 words
A femur component according to claim 1, wherein said shaft member comprises a longitudinal center axis and wherein said recesses extend essentially in the direction of said center axis.
Claim 5
Dependent Claim
35 words
A femur component according to claim 1, wherein in said proximal range H said anterior and posterior sides are formed with a conical configuration which extends at a cone angle of between 4° and 10°.
Claim 6
Dependent Claim
16 words
A femur component according to claim 4, wherein said cone angle is between 6° and 8°.
Claim 7
Dependent Claim
38 words
A femur component according to claim 1, wherein in said proximal range H said shaft member has a narrowing configuration from said lateral side to said medial side shaped with a cone angle of between 5° and 20°.
Claim 8
Dependent Claim
16 words
A femur component according to claim 6, wherein said cone angle is between 10° and 15°.
Claim 9
Dependent Claim
19 words
A femur component according to claim 1, wherein said recesses are formed with a minimum depth of 1 mm.
Claim 10
Dependent Claim
16 words
A femur component according to claim 8, wherein the depth of said recesses is 2 mm.
Claim 11
Dependent Claim
20 words
A femur component according to claim 1, wherein said recesses extend over a distance of between 2 and 8 mm.
Claim 12
Dependent Claim
20 words
A femur component according to claim 10, wherein said recesses extend over a distance of between 3 and 6 mm.
Claim 13
Dependent Claim
38 words
A femur component according to claim 1, wherein the exposed surface area of said shaft member in said proximal range H is enlarged by the formation of said recesses by a factor of between 1.3 and 2.7 times.
Claim 14
Dependent Claim
22 words
A femur component according to claim 12, wherein said surface area is enlarged by a factor of between 1.6 and 2.4 times.
Claim 15
Dependent Claim
28 words
A femur component according to claim 1, wherein said shaft member at said proximal range H has a cross-sectional configuration which is in the shape of a trapezoid.
Claim 16
Dependent Claim
24 words
A femur component according to claim 14, wherein said cross-sectional configuration of said proximal range H is in the shape of an equilateral trapezoid.
Claim 17
Dependent Claim
29 words
A femur component according to claim 1, wherein said shaft member has a smooth surface extending along the distal part thereof from said transitional portion to said distal end.
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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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |