US4892549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-radius acetabular cup component
Assignee: Howmedica Osteonics Corp
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Filing: 1989-01-31
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Granted: 1990-01-09
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Expires: 2009-01-31
Abstract
Abstract An acetabular cup has a shell component with an outer surface including a first spherical surface portion and a second spherical surface portion, and an acetabulum is prepared with an inner surface having a spherical configuration complementary to the second spherical surface portion of the shell component, the radius of the first spherical surface portion being slightly greater than the radius of the second spherical surface portion such that upon nesting of the second spherical surface portion of the shell component in contiguous relationship with the inner surface of the acetabulum, the first spherical surface portion engages the inner surface of the acetabulum in an interference fit to secure the shell component within the prepared acetabulum.
Inventors
- 👤 Harry E. Figgie, III
- 👤 Alfred J. Zarnowski
- 👤 Matthew V. Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2002/30001; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30535; A61F2002/30537; A61F2002/30538; A61F2002/3054; A61F2/30767; A61F2/30771; A61F2002/30836; A61F2002/3401; A61F2002/3403; A61F2002/3412; A61F2002/3414; A61F2002/3453; A61F2002/3459; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2250/00; A61F2250/0014; A61F2250/0026
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
A shell component for use in an acetabular cup assembly of a prosthetic joint, the shell component having a dual-radius outer surface contour configured for implant into an acetabulum and securement therein by an interference fit, the shell component comprising: a lower rim; an apical region spaced upwardly in an axial direction a given distance from the lower rim; an intermediate location spaced approximately one-half the distance between the lower rim and the apical region; and an outer surface having a first generally spherical surface portion extending upwardly from the lower rim to the intermediate location, and a second generally spherical surface portion extending upwardly from the intermediate location to the apical region, the first generally spherical surface portion having a radius slightly greater than the radius of the second generally spherical surface portion.
Claim 2
Dependent Claim
134 words
A shell component for use in an acetabular cup assembly of a prosthetic joint, the shell component having a dual-radius outer surface contour configured for implant into an acetabulum and securement therein by an interference fit, the shell component comprising: a lower rim; an apical region spaced upwardly in an axial direction a given distance from the lower rim; an intermediate location spaced approximately one-half the distance between the lower rim and the apical region; and an outer surface having a first generally spherical surface portion extending upwardly from the lower rim to the intermediate location, and a second generally spherical surface portion extending upwardly from the intermediate location to the apical region, the first generally spherical surface portion having a radius slightly greater than the radius of the second generally spherical surface portion.
Claim 3
Dependent Claim
32 words
The invention of claim 1 wherein the difference between the radius of the first generally spherical surface portion and the radius of the second generally spherical surface portion is approximately 0.5 mm.
Claim 4
Dependent Claim
17 words
The invention of claim 2 wherein the first generally spherical surface portion includes an affixation-assisting surface treatment.
Claim 5
Dependent Claim
42 words
The invention of claim 1 wherein the shell component has a central axis and the origin of the radius of the first generally spherical surface portion is located along the central axis, spaced downwardly in an axial direction from the lower rim.
Claim 6
Dependent Claim
33 words
The invention of claim 4 wherein the origin of the radius of the second generally spherical surface portion is coincident with the origin of the radius of the first generally spherical surface portion.
Claim 7
Dependent Claim
32 words
The invention of claim 5 wherein the difference between the radius of the first generally spherical surface portion and the radius of the second generally spherical surface portion is approximately 0.5 mm.
Claim 8
Dependent Claim
17 words
The invention of claim 1 wherein the first generally spherical surface portion includes an affixation-assisting surface treatment.
Claim 9
Dependent Claim
131 words
An acetabular cup having a unitary dual-radius outer surface contour configuration for implant into an acetabulum and securement therein by an interference fit, the acetabular cup having a lower rim, an apical region spaced upwardly in an axial direction a given distance from the lower rim, an intermediate location spaced approximately one-half the distance between the lower rim and the apical region, and an outer surface extending between the lower rim and the apical region, the outer surface contour configuration comprising: a first generally spherical portion extending upwardly between the lower rim and the intermediate location; and a second generally spherical portion extending upwardly between the intermediate location and the apical region; the first generally spherical portion having a radius slightly greater than the radius of the second generally spherical portion.
Claim 10
Dependent Claim
131 words
An acetabular cup having a unitary dual-radius outer surface contour configuration for implant into an acetabulum and securement therein by an interference fit, the acetabular cup having a lower rim, an apical region spaced upwardly in an axial direction a given distance from the lower rim, an intermediate location spaced approximately one-half the distance between the lower rim and the apical region, and an outer surface extending between the lower rim and the apical region, the outer surface contour configuration comprising: a first generally spherical portion extending upwardly between the lower rim and the intermediate location; and a second generally spherical portion extending upwardly between the intermediate location and the apical region; the first generally spherical portion having a radius slightly greater than the radius of the second generally spherical portion.
Claim 11
Dependent Claim
30 words
The invention of claim 5 wherein the difference between the radius of the first generally spherical portion and the radius of the second generally spherical portion is approximately 0.5 mm.
Claim 12
Dependent Claim
16 words
The invention of claim 9 wherein the first generally spherical portion includes an affixation-assisting surface treatment.
Claim 13
Dependent Claim
41 words
The invention of claim 8 wherein the acetabular cup has a central axis and the origin of the radius of the first generally spherical portion is located along the central axis, spaced downwardly in an axial direction from the lower rim.
Claim 14
Dependent Claim
31 words
The invention of claim 11 wherein the origin of the radius of the second generally spherical portion is coincident with the origin of the radius of the first generally spherical portion.
Claim 15
Dependent Claim
30 words
The invention of claim 12 wherein the difference between the radius of the first generally spherical portion and the radius of the second generally spherical portion is approximately 0.5 mm.
Claim 16
Dependent Claim
16 words
The invention of claim 8 wherein the first generally spherical portion includes an affixation-assisting surface treatment.
References Cited (Backward Citations)
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Cited
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |