Patent US3409529A successfully refreshed from Google Patents.
Patent US4589883A successfully refreshed from Google Patents.
US4589883A
Expired / Lapsed
US
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Femoral hip prosthesis
Assignee: Howmedica Osteonics Corp
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Filing: 1983-06-06
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Granted: 1986-05-20
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Expires: 2003-06-06
Abstract
Abstract A femoral hip prosthesis comprises a stem component generally divided into a proximal portion and a substantially longer distal portion. The stem has a slight posterior bow along its length. The proximal portion includes a slight twist of from about 5° to 15°, the twist extending in a direction from the anterior to the posterior face of the stem through the medial face thereof. The characteristics of the stem provide a glove fit when inserted into a prepared intermedullary canal in the femur.
Inventors
- 👤 Robert V. Kenna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:45
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/30767; A61F2002/30001; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30769; A61F2002/3678; A61F2002/3698; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
A femoral hip prosthesis comprising a stem component with an anterior face, a posterior face, a lateral face and a medial face and having a proximal portion and a substantially longer distal portion, the stem being noncircular in cross section and exhibiting a slight posterior bow along its length, the stem further including a twist of from about 5° to 15° in the proximal portion, the twist extending in a direction from the anterior to the posterior face about the longitudinal axis of the stem, thereby providing a more accurate fit between the stem and an intramedullary cavity and positive resistance to rotation of the stem within the cavity.
Claim 2
Dependent Claim
109 words
A femoral hip prosthesis comprising a stem component with an anterior face, a posterior face, a lateral face and a medial face and having a proximal portion and a substantially longer distal portion, the stem being noncircular in cross section and exhibiting a slight posterior bow along its length, the stem further including a twist of from about 5° to 15° in the proximal portion, the twist extending in a direction from the anterior to the posterior face about the longitudinal axis of the stem, thereby providing a more accurate fit between the stem and an intramedullary cavity and positive resistance to rotation of the stem within the cavity.
Claim 3
Dependent Claim
34 words
A femoral hip prosthesis as in claim 1 wherein the length of the distal portion is from about 2 to 3 times the length of the proximal portion as measured along the medial face.
Claim 4
Dependent Claim
22 words
A femoral hip prosthesis as in claim 1 wherein the twist generally commences at the boundary of the distal and proximal portions.
Claim 5
Dependent Claim
16 words
A femoral hip prosthesis as in claim 3 wherein the twist extends throughout the proximal portion.
Claim 6
Dependent Claim
14 words
A femoral hip prosthesis as in claim 4 wherein the twist is about 9°.
Claim 7
Dependent Claim
20 words
A femoral hip prosthesis as in claim 1 wherein the exterior surface of the proximal portion includes a porous coating.
Claim 8
Dependent Claim
38 words
A femoral hip prosthesis as in claim 6 wherein the proximal portion is generally equally divided into a proximal segment, a central segment and a distal segment with a flare on the lateral face of the distal segment.
Claim 9
Dependent Claim
35 words
A femoral hip prosthesis as in claim 1 wherein the proximal portion is generally equally divided into a proximal segment, a central segment and a distal segment with a lateral flare on the distal segment.
Claim 10
Dependent Claim
34 words
A femoral hip prosthesis as in claim 8 including a neck extending from the proximal segment, the neck having an axis at an angle of about 45° to the general orientation of the stem.
Claim 11
Dependent Claim
22 words
A femoral hip prosthesis as in claim 9 wherein the neck is anteverted at an angle of from about 5° to 15°.
Claim 12
Dependent Claim
15 words
A femoral hip prosthesis as in claim 10 including a capitulum secured to the neck.
Claim 13
Dependent Claim
21 words
A femoral hip prosthesis as in claim 11 wherein the capitulum and the neck are secured together by a Morse fit.
Claim 14
Dependent Claim
17 words
A femoral hip prosthesis as in claim 1 wherein the stem is generally oblong in cross section.
Claim 15
Dependent Claim
32 words
A femoral hip prosthesis as in claim 1 wherein the twist extends in a direction from the anterior through the medial to the posterior face about the longitudinal axis of the stem.
References Cited (Backward Citations)
US3102536A
Cited
US3320951A
Cited
US3874003A
Cited
US3875593A
Cited
US3818512A
Cited
US3965490A
Cited
US4012796A
Cited
US4080666A
Cited
US4435854A
Cited
US4406023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |