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US3891997A Expired / Lapsed US ⏱️ 0.0 years remaining

Hip-joint prosthesis

Assignee: Individual
•
Filing: 1974-03-11
•
Granted: 1975-07-01
•
Expires: 1994-03-11
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Abstract

Abstract A prosthetic hip joint comprises a femoral element formed with a ball head and a stem projecting from the head and adapted to be received within the upper end of a femur, and a generally hemispherical socket element adapted to be secured in the ilium at the acetabulum thereof and having an inner surface formed as a generally hemispherical cavity adapted to snugly receive the ball head. The outer surface of the socket element is subdivided at a step into a lower quarter-spherical region having a center of curvature lying above the center of curvature of the ballreceiving cavity, and an upper quarter-spherical region adjoining the lower region and having a center of curvature coinciding with the center of curvature of the ball-receiving cavity. The step between the two quarter-cylindrical regions is formed with a chamfer and both of these regions are formed with a plurality of criss-crossing grooves, in at least one of which is received a metal wire allowing the synthetic-resin socket element to be viewed in an X-ray. The ball head of the femoral element is formed with a neck that is tapered into the stem and forms a pair of shoulders thereon.

Inventors

  • 👤 Jean Jules Marie Ernes Herbert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 01:57
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61B; A61B90/00; A61B90/39; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/3008; A61F2002/30108; A61F2002/30199; A61F2002/30242; A61F2002/30245; A61F2/30767; A61F2/30771; A61F2002/3082; A61F2002/3241; A61F2/34; A61F2002/344; A61F2002/3453; A61F2002/3459; A61F2230/00; A61F2230/0063; A61F2230/0071; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 150 words
A prosthetic hip joint comprising: a femoral element formed with a ball head and a stem projecting from said head and adapted to be received within the upper end of a femur, and a generally hemispherical socket element adapted to be secured in a predetermined orientation in an ilium at the acetabulum thereof and having an inner surface formed as a generally hemispherical cavity having a single center of curvature and receiving snugly said ball head, and having an outer surface formed as a lower quarter-spherical region having a center of curvature lying above the center of curvature of said cavity and an upper quarter-spherical region adjoining and above said lower region and having a center of curvature coinciding with said single center of curvature of said cavity, said socket element being of uniform radial thickness throughout said upper region and of upwardly increasing radial thickness at said lower region.
Claim 2
Dependent Claim 150 words
A prosthetic hip joint comprising: a femoral element formed with a ball head and a stem projecting from said head and adapted to be received within the upper end of a femur, and a generally hemispherical socket element adapted to be secured in a predetermined orientation in an ilium at the acetabulum thereof and having an inner surface formed as a generally hemispherical cavity having a single center of curvature and receiving snugly said ball head, and having an outer surface formed as a lower quarter-spherical region having a center of curvature lying above the center of curvature of said cavity and an upper quarter-spherical region adjoining and above said lower region and having a center of curvature coinciding with said single center of curvature of said cavity, said socket element being of uniform radial thickness throughout said upper region and of upwardly increasing radial thickness at said lower region.
Claim 3
Dependent Claim 41 words
The joint defined in claim 1 wherein said outer surface is formed with a step between said lower region and said upper region, said radial thickness of said upper region being greater than the maximum radial thickness of said lower region.
Claim 4
Dependent Claim 14 words
The joint defined in claim 2 wherein said step is formed with a chamfer.
Claim 5
Dependent Claim 18 words
The joint defined in claim 2 wherein said outer surface is formed with a plurality of crossing grooves.
Claim 6
Dependent Claim 17 words
The joint defined in claim 4, further comprising a metal wire disposed in one of said grooves.
Claim 7
Dependent Claim 18 words
The joint defined in claim 5 wherein said one groove extends from said stop across the upper region.
Claim 8
Dependent Claim 37 words
The joint defined in claim 2 wherein said stem is tapered and said femoral element is formed with a neck joining said ball head to said stem, said neck blending at least partially smoothly into said stem.
Claim 9
Dependent Claim 21 words
The joint defined in claim 7 wherein said neck is formed on opposite lateral sides with a pair of separate shoulders.

References Cited (Backward Citations)

US3608096A Cited
US3722002A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-06-30 1978-12-30 1979-07-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-06-30 1982-12-30 1983-07-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-06-30 1986-12-30 1987-07-01 $7700.00 Window Closed / Lapsed

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