US5009665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetabular cup
Assignee: DePuy Orthopaedics Inc
•
Filing: 1989-02-08
•
Granted: 1991-04-23
•
Expires: 2009-02-08
Abstract
Abstract An improved acetabular cup for use in cement fixation has at least one flat area on its generally hemispherical outer surface. The flat area resists rotation of the cup in the cement mantle after implantation while avoiding concentrations of stress in the mantle.
Inventors
- 👤 Jon C. Serbousek
- 👤 John A. Engelhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2/30721; A61F2/30724; A61F2002/3412
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
68 words
An improved acetabular cup prosthesis for use in cement fixation to bone, said cup comprising a hemispherical member having an internal recess which forms a bearing surface suitable for receiving a natural or prosthetic femoral head and a generally hemispherical outer surface on which there is at least one substantially flat area displaced from the apex of the cup and within the cross-sectional profile of the hemispherical surface.
Claim 2
Dependent Claim
68 words
An improved acetabular cup prosthesis for use in cement fixation to bone, said cup comprising a hemispherical member having an internal recess which forms a bearing surface suitable for receiving a natural or prosthetic femoral head and a generally hemispherical outer surface on which there is at least one substantially flat area displaced from the apex of the cup and within the cross-sectional profile of the hemispherical surface.
Claim 3
Dependent Claim
13 words
The prosthesis of claim 1 wherein the substantially flat area is substantially circular.
Claim 4
Dependent Claim
13 words
The prosthesis of claim 1 wherein there is a plurality of flat areas.
Claim 5
Dependent Claim
27 words
The prosthesis of claim 1 wherein the margin between the flat portion of the outer surface and the substantially hemispherical portion of the outer surface is blended.
Claim 6
Dependent Claim
11 words
The prosthesis of claim 1 wherein the outer surface is treated.
Claim 7
Dependent Claim
12 words
The prosthesis of claim 5 wherein the surface is treated by roughening.
Claim 8
Dependent Claim
24 words
The prosthesis of claim 1 wherein spacers are used to determine the standoff between the prosthesis surface and bone into which it is implanted.
Claim 9
Dependent Claim
72 words
An improved acetabular cup prosthesis for use in cement fixation to bone, said cup comprising a hemispherical shell having on its outer surface at least one flat area which is displaced from the apex of the cup and which is within the cross-sectional profile of the cup and having retained internally a bearing member which is shaped to provide an internal bearing surface suitable for receiving a natural or prosthetic femoral head.
Claim 10
Dependent Claim
72 words
An improved acetabular cup prosthesis for use in cement fixation to bone, said cup comprising a hemispherical shell having on its outer surface at least one flat area which is displaced from the apex of the cup and which is within the cross-sectional profile of the cup and having retained internally a bearing member which is shaped to provide an internal bearing surface suitable for receiving a natural or prosthetic femoral head.
Claim 11
Dependent Claim
13 words
The prosthesis of claim 8 wherein the substantially flat area is substantially circular.
Claim 12
Dependent Claim
13 words
The prosthesis of claim 8 wherein there is a plurality of flat areas.
Claim 13
Dependent Claim
27 words
The prosthesis of claim 8 wherein the margin between the flat portion of the outer surface and the substantially hemispherical portion of the outer surface is blended.
Claim 14
Dependent Claim
11 words
The prosthesis of claim 8 wherein the outer surface is treated.
Claim 15
Dependent Claim
12 words
The prosthesis of claim 12 wherein the surface is treated by roughening.
Claim 16
Dependent Claim
24 words
The prosthesis of claim 8 wherein spacers are used to determine the standoff between the prosthesis surface and bone into which it is implanted.
Claim 17
Dependent Claim
10 words
The prosthesis of claim 8 wherein the shell is metal.
Claim 18
Dependent Claim
12 words
The prosthesis of claim 8 wherein the bearing member is a polymer.
References Cited (Backward Citations)
US4530116A
Cited
US4563778A
Cited
US4566138A
Cited
US4666450A
Cited
US4695282A
Cited
DE3714468A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |