Patent US5133770A successfully refreshed from Google Patents.
US5133770A
Expired / Lapsed
US
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Shaft for prosthesis
Assignee: Sulzer AG
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Filing: 1990-10-25
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Granted: 1992-07-28
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Expires: 2010-10-25
Abstract
Abstract A shaft for a hip joint prosthesis is provided with a square cross-section in the distal region of the shaft. In addition, teeth are provided along each corner of the shaft to provide support on a cortical bone. At least some of other teeth are directed in the proximal direction to displace the osseous tissue rather thanto exert a cutting force on the osseous tissue. The angular stresses occurring when the shaft is inserted in a bone are reduced without the loss of the spaces between the sides of the shaft and bone for the growth of osseous tissue and a revascularization of the bone.
Inventors
- 👤 Karl Zweymuller
- 👤 Rudolf Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:31
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61F2/367; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30154; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2/30767; A61F2/30771; A61F2002/30904; A61F2/3609; A61F2002/3625; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0021; A61F2250/00; A61F2250/0014; A61F2250/0026
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
78 words
A prosthesis comprising a shaft having a longitudinal axis, a proximal region with rounded corners, and a plurality of planar sides in a distal region defining a square cross-section, each said side widening in a proximal direction within said distal region coaxially of said longitudinal axis, each pair of sides defining a corner with a plurality of teeth extending longitudinally along said corner, at least some of said teeth having steep tooth surfaces directed in said proximal direction.
Claim 2
Dependent Claim
78 words
A prosthesis comprising a shaft having a longitudinal axis, a proximal region with rounded corners, and a plurality of planar sides in a distal region defining a square cross-section, each said side widening in a proximal direction within said distal region coaxially of said longitudinal axis, each pair of sides defining a corner with a plurality of teeth extending longitudinally along said corner, at least some of said teeth having steep tooth surfaces directed in said proximal direction.
Claim 3
Dependent Claim
43 words
A as set forth in claim 1 wherein the teeth along two corners on one side of a median plane extending in an anterior-posterior direction have a depth greater than the teeth along the two corners on the opposite side of said plane.
Claim 4
Dependent Claim
22 words
A prosthesis as set forth in claim 1 wherein said teeth along at least one corner are directed in a distal direction.
Claim 5
Dependent Claim
18 words
A prosthesis as set forth in claim 1 wherein said proximal region is of oval shape in cross-section.
Claim 6
Dependent Claim
25 words
A prosthesis as set forth in claim 1 wherein said distal region extends over approximately one-half the shaft height as measured from the ends thereof.
Claim 7
Dependent Claim
114 words
A hip joint prosthesis comprising a shaft having a proximal region with rounded corners, a distal region extending from said proximal region with a plurality of plane sides defining a square cross-section in said distal region thereof, each side widening in a proximal direction within said distal region coaxially of a longitudinal axis; and a plurality of teeth extending along each corner of said shaft between a respective pair of said sides, at least some of said teeth along at least one of said corners being directed in said proximal direction; and a neck extending from said shaft at a proximal end on a neck axis co-planar with and angularly of said longitudinal axis.
Claim 8
Dependent Claim
114 words
A hip joint prosthesis comprising a shaft having a proximal region with rounded corners, a distal region extending from said proximal region with a plurality of plane sides defining a square cross-section in said distal region thereof, each side widening in a proximal direction within said distal region coaxially of a longitudinal axis; and a plurality of teeth extending along each corner of said shaft between a respective pair of said sides, at least some of said teeth along at least one of said corners being directed in said proximal direction; and a neck extending from said shaft at a proximal end on a neck axis co-planar with and angularly of said longitudinal axis.
Claim 9
Dependent Claim
41 words
A hip joint prosthesis as set forth in claim 6 wherein said shaft has a median plane extending perpendicularly of a plane containing said axes and wherein said teeth located laterally of said median plane are directed in said proximal direction.
Claim 10
Dependent Claim
33 words
A hip joint prosthesis as set forth in claim 7 wherein said teeth located laterally of said median plane are of a greater depth than said teeth located medially of said median plane.
Claim 11
Dependent Claim
39 words
A hip joint prosthesis as set forth in claim 7 wherein two of said sides of said shaft are at least substantially parallel to and two of said sides are at right angles to said plane containing said axes.
Claim 12
Dependent Claim
25 words
A hip joint prosthesis as set forth in claim 7 wherein said teeth positioned medially of said median plane are directed in a distal direction.
Claim 13
Dependent Claim
18 words
A hip joint prosthesis as set forth in claim 7 wherein each tooth is of saw tooth shape.
Claim 14
Dependent Claim
105 words
A prosthesis comprising a shaft having a longitudinal axis and a plurality of planar sides in a distal region defining a square cross-section, each said side widening in a proximal direction within said distal region coaxially of said longitudinal axis, each pair of sides defining a corner with a plurality of teeth extending longitudinally along said corner, at least some of said teeth being directed in said proximal direction, and said teeth along two corners on one side of a median plane extending in an anterior-posterior direction have a depth greater than the teeth along the two corners on the opposite side of said plane.
Claim 15
Dependent Claim
105 words
A prosthesis comprising a shaft having a longitudinal axis and a plurality of planar sides in a distal region defining a square cross-section, each said side widening in a proximal direction within said distal region coaxially of said longitudinal axis, each pair of sides defining a corner with a plurality of teeth extending longitudinally along said corner, at least some of said teeth being directed in said proximal direction, and said teeth along two corners on one side of a median plane extending in an anterior-posterior direction have a depth greater than the teeth along the two corners on the opposite side of said plane.
Claim 16
Dependent Claim
117 words
A hip joint prosthesis comprising a shaft having a plurality of plane sides defining a square cross-section in a distal region thereof, each side widening in a proximal direction within said distal region coaxially of a longitudinal axis, said shaft having a median plane extending in an anterior-posterior direction; and a plurality of teeth extending along each corner of said shaft between a respective pair of said sides, said teeth extending laterally of said median plane being directed in said proximal direction and being of a greater depth than said teeth located medially of said median plane; and a neck extending from said shaft at a proximal end on a neck axis co-planar with said longitudinal axis.
Claim 17
Dependent Claim
117 words
A hip joint prosthesis comprising a shaft having a plurality of plane sides defining a square cross-section in a distal region thereof, each side widening in a proximal direction within said distal region coaxially of a longitudinal axis, said shaft having a median plane extending in an anterior-posterior direction; and a plurality of teeth extending along each corner of said shaft between a respective pair of said sides, said teeth extending laterally of said median plane being directed in said proximal direction and being of a greater depth than said teeth located medially of said median plane; and a neck extending from said shaft at a proximal end on a neck axis co-planar with said longitudinal axis.
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) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |