US5004475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hip prosthesis
Assignee: Individual
•
Filing: 1989-03-15
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Granted: 1991-04-02
•
Expires: 2009-03-15
Abstract
Abstract A femoral hip prosthesis and a stem therefor comprising a femur end to be received in the femur and a head end for connection to a hip head, which stem is provided for medial support on the public arch (S 1 ) with a curved, smooth medial stem support part, is provided for lateral support on the lateral cortex (S 2 ) with a lateral stem support part, and is provided for lateral support on the greater trochanter (S 3 ) with a lateral comb-like stem support part located between the lateral stem support part and the head end and comprising a number of combs, the combs connecting onto the lateral side protruding laterally relative thereto, and which stem is provided on the ventral and dorsal sides at the point of the metaphysial portion with at least one groove which consists of groove portions converging in the direction of the head end and enclosing an apex.
Inventors
- 👤 Dirk V. Vermeire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:52
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/30767; A61F2/30771; A61F2/3662; A61F2/367; A61F2/3609; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30153; A61F2002/30199; A61F2002/30205; A61F2002/3021; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/3082; A61F2002/30827; A61F2002/30828; A61F2002/30831; A61F2002/3678; A61F2002/369; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0019; A61F2230/0063; A61F2230/0067; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
153 words
Stem for a hip prosthesis having a femur end to be received in the femur and a head end for connection to a hip head, which stem is provided for medial support on the pubic arch (S 1 ) with a curved, smooth medial stem support part, is provided for lateral support on the lateral cortex (S 2 ) with a lateral stem support part, and is provided for lateral support on the greater trochanter (S 3 ) with a lateral comb-like stem support part located between the lateral stem support part and the head end and comprising a number of combs, the comb connecting onto the lateral side protruding laterally relative thereto, and which stem is provided on the ventral and dorsal side at the point of the metaphysial portion with at least one groove which consists of groove portions converging in the direction of the head end and enclosing an apex.
Claim 2
Dependent Claim
153 words
Stem for a hip prosthesis having a femur end to be received in the femur and a head end for connection to a hip head, which stem is provided for medial support on the pubic arch (S 1 ) with a curved, smooth medial stem support part, is provided for lateral support on the lateral cortex (S 2 ) with a lateral stem support part, and is provided for lateral support on the greater trochanter (S 3 ) with a lateral comb-like stem support part located between the lateral stem support part and the head end and comprising a number of combs, the comb connecting onto the lateral side protruding laterally relative thereto, and which stem is provided on the ventral and dorsal side at the point of the metaphysial portion with at least one groove which consists of groove portions converging in the direction of the head end and enclosing an apex.
Claim 3
Dependent Claim
24 words
Stem as claimed in claim 1, characterized in that the radius of curvature of the curved medial stem support part amounts to 120-150 cm.
Claim 4
Dependent Claim
42 words
Stem as claimed in claim 1, characterized in that in the direction towards the femur end a flat medial side portion connects onto the curved medial stem support part, which portion diverges relative to the flat lateral side facing away from it.
Claim 5
Dependent Claim
17 words
Stem as claimed in claim 3, characterized in that the angle of divergence amounts to 1°14 5°.
Claim 6
Dependent Claim
17 words
Stem as claimed in claim 3, characterized in that the angle of divergence amounts to 2°14 4°.
Claim 7
Dependent Claim
16 words
Stem as claimed in claim 3, characterized in that the angle of divergence amounts to 3°.
Claim 8
Dependent Claim
40 words
Stem as claimed in claim 1, characterized in that the groove connects on the one side to the curved medial stem support part and on the other side to the lateral stem support part or the comb-like stem support part.
Claim 9
Dependent Claim
17 words
Stem as claimed in claim 1, characterized in that the stem possesses a substantially rounded rectangular section.
Claim 10
Dependent Claim
21 words
Stem as claimed in Claim 1 characterized in that at least the metaphysial portion of the stem is coated with hydroxyapatite.
Claim 11
Dependent Claim
18 words
Hip prosthesis comprising a stem as claimed in claim 1 and a hip head connected to said stem.
Claim 12
Dependent Claim
25 words
Stem as claimed in claim 2, characterized in that the radius of curvature of the curved medial stem support part amounts to 130-140 cm .
Claim 13
Dependent Claim
25 words
Stem as claimed in claim 11, characterized in that the radius of curvature of the curved medial stem support part amounts to 135 cm .
Claim 14
Dependent Claim
42 words
Stem as claimed in claim 2, characterized in that in the direction towards the femur end a flat medial side portion connects onto the curved medial stem support part, which portion diverges relative to the flat lateral side facing away from it.
Claim 15
Dependent Claim
40 words
Stem as claimed in claim 2, characterized in that the groove connects on the one side to the curved medial stem support part and ont he other side to the lateral stem support part or the comb-like stem support part.
Claim 16
Dependent Claim
42 words
Stem as claimed in claim 11, characterized in that in the direction towards the femur end a flat medial side portion connects onto the curved medial stem support part, which portion diverges relative to the flat lateral side facing away from it.
Claim 17
Dependent Claim
42 words
Stem as claimed in claim 12, characterized in that in the direction towards the femur end a flat medial side portion connects onto the curved medial stem support part, which portion diverges relative to the flat lateral side facing away from it.
Claim 18
Dependent Claim
40 words
Stem as claimed in claim 11, characterized in that the groove connects on the one side to the curved medial stem support part and on the other side to the lateral stem support part or the comb-like stem support part.
Claim 19
Dependent Claim
40 words
Stem as claimed in claim 12, characterized in that the groove connects on the one side to the curved medial stem support part and on the other side to the lateral stem support part or the comb-like stem support part.
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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) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |