US4031570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic acetabulum
Assignee: Sulzer AG
•
Filing: 1976-05-27
•
Granted: 1977-06-28
•
Expires: 1996-05-27
Abstract
Abstract The concave articular surface of the prosthetic acetabulum which receives a spherical joint head is formed with a groove which extends about the surface and joint head. This groove serves to distribute the lubricant within the joint during loading and unloading of the joint.
Inventors
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:12
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30289; A61F2002/30621; A61F2002/30649; A61F2002/30654; A61F2002/30655; A61F2002/30657; A61F2002/3066; A61F2002/30662; A61F2002/30667; A61F2002/30673; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/3082; A61F2002/30822; A61F2002/30827; A61F2002/30878; A61F2002/30879; A61F2002/30934; A61F2002/30937; A61F2002/3225; A61F2002/3429; A61F2002/348; A61F2002/3493; A61F2/36; A61F2/3609; A61F2002/3611; A61F2/46; A61F2002/4631; A61F2230/00; A61F2230/0063; A61F2230/0091; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00179; A61F2310/00185; A61F2310/00203
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A hip joint endoprosthesis comprising a joint head with a spherical surface; and a prosthetic acetabulum having a concave articular surface receiving said joint head and at least one groove within said surface extending peripherally of said surface and said joint head, said articular surface being a surface of rotation having as a generatrix a quadrant arc with a radius corresponding to the radius of said joint head spherical surface but a center of curvature spaced a predetermined distance from the rotational axis around which said quadrant arc is rotated for generating said surface of rotation of said acetabulum.
Claim 2
Dependent Claim
99 words
A hip joint endoprosthesis comprising a joint head with a spherical surface; and a prosthetic acetabulum having a concave articular surface receiving said joint head and at least one groove within said surface extending peripherally of said surface and said joint head, said articular surface being a surface of rotation having as a generatrix a quadrant arc with a radius corresponding to the radius of said joint head spherical surface but a center of curvature spaced a predetermined distance from the rotational axis around which said quadrant arc is rotated for generating said surface of rotation of said acetabulum.
Claim 3
Dependent Claim
20 words
A hip joint endoprosthesis as set forth in claim 1 wherein said distance is from 0.1 millimeters to 0.5 millimeters.
Claim 4
Dependent Claim
26 words
A hip joint endoprosthesis as set forth in claim 1 wherein said concave surface has a diameter greater than the diameter of said spherical joint head.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |