US5108448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cup intended to be fixed cementlessly for a total hip prosthesis
Assignee: HIGH TECH INDUSTRIES SA
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Filing: 1990-03-29
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Granted: 1992-04-28
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Expires: 2010-03-29
Abstract
Abstract This cup is of the type composed of three spherical caps (2, 3, 4), namely: an outer cap (2) made of a rigid material whose outer face is provided with radial roughnesses (11) designed for it to be attached in the acetabulum, an inner cap (3) made of hard, biocompatible material with a low friction coefficient, and an intermediate cap (4) made of a semi-rigid material, and in the outer cap (2) of which are cut out radially movable tongues (5) shaped like portions of spherical-cap sectors, defined by arcuate slots (5). Arcuate slots (5) extend between two circles parallel to the opening plane (2b) of this cap, one of which slots is located near this plane and the other is located near the top (2c) of the cap, the ends of these slots (5) located near top (2c) of cap (2l also being connected, two by two, by partially annular slots (7) coinciding with the aforesaid circle which is located near the top (2c) of cap (2).
Inventors
- 👤 Jean E. Gautier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:35
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2/46; A61F2/4603; A61F2/4609; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30426; A61F2002/30428; A61F2002/30429; A61F2002/30476; A61F2002/30484; A61F2002/30492; A61F2002/305; A61F2002/30535; A61F2002/30563; A61F2002/30579; A61F2002/30594; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/30841; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2002/30894; A61F2002/3412; A61F2002/3414; A61F2002/3445; A61F2002/3448; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00179; A61F2310/00185; A61F2310/00203
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
An acetabular cup having a polar region and an opposite equatorial region, said cup being adapted to be cementlessly affixed to a prepared acetabulum, comprising: a spherical inner shell formed of a biocompatible hard material having a low coefficient of friction; a spherical intermediate shell formed of a biocompatible semi-rigid, elastic material; a rigid, spherical outer shell formed of a biocompatible material, said outer shell being divided into movable segments, said movable segments having projection means extending radially outwardly therefrom, said segments being defined by a pair of arcuate slits extending along the longitudinal direction between the polar and equatorial regions and a latitudinal slit intersecting said arcuate slits near the polar region, wherein each segment can be displaced radially outwardly forcing the projection means into the adjacent bone.
Claim 2
Dependent Claim
129 words
An acetabular cup having a polar region and an opposite equatorial region, said cup being adapted to be cementlessly affixed to a prepared acetabulum, comprising: a spherical inner shell formed of a biocompatible hard material having a low coefficient of friction; a spherical intermediate shell formed of a biocompatible semi-rigid, elastic material; a rigid, spherical outer shell formed of a biocompatible material, said outer shell being divided into movable segments, said movable segments having projection means extending radially outwardly therefrom, said segments being defined by a pair of arcuate slits extending along the longitudinal direction between the polar and equatorial regions and a latitudinal slit intersecting said arcuate slits near the polar region, wherein each segment can be displaced radially outwardly forcing the projection means into the adjacent bone.
Claim 3
Dependent Claim
42 words
An acetabular cup as in claim 1, wherein at least one of the movable segments includes a secondary movable segment, said secondary segment being defined by a second pair of arcuate slits, said secondary segment having projection means extending radially outwardly therefrom.
Claim 4
Dependent Claim
29 words
An acetabular cup as in claim 2, wherein the secondary segment is further defined by a latitudinal slit intersecting the second pair of arcuate slits near the equatorial region.
Claim 5
Dependent Claim
29 words
An acetabular cup as in claim 1, comprising: means for mounting the inner shell on the intermediate shell; and means for mounting the intermediate shell on the outer shell.
Claim 6
Dependent Claim
24 words
An acetabular cup as in claim 4, wherein the means for mounting the intermediate shell on the outer shell comprises a bayonet fastening means.
Claim 7
Dependent Claim
23 words
An acetabular cup as in claim 4, wherein the means for mounting the inner shell on the intermediate shell comprises a snap fitting.
Claim 8
Dependent Claim
32 words
A acetabular cup as in claim 6, wherein the snap fitting comprises a raised rib formed on the inner shell and a groove for receiving said rib formed on the intermediate shell.
Claim 9
Dependent Claim
36 words
An acetabular cup as in claim 7, comprising a stud extending from the inner shell and a cavity for receiving the stud in the intermediate shell, whereby rotation between the inner and intermediate shells is prevented.
Claim 10
Dependent Claim
16 words
An acetabular cup as in claim 1, wherein the inner shell is of a ceramic material.
Claim 11
Dependent Claim
23 words
An acetabular cup as in claim 9, wherein the ceramic material is selected from the group consisting of alumina ceramic and zirconia ceramic.
Claim 12
Dependent Claim
16 words
An acetabular cup as in claim 1, wherein the intermediate shell is of low density polyethylene.
Claim 13
Dependent Claim
25 words
An acetabular cup as in claim 1, wherein the outer shell is of a material selected from the group consisting of stainless steel and titanium.
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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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |