US4435854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hip joint prosthesis with a shaft to be fitted into the medullary canal of the femur
Assignee: Waldemar Link GmbH and Co KG
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Filing: 1981-03-26
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Granted: 1984-03-13
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Expires: 2001-03-26
Abstract
Abstract A hip joint prosthetic device having a support shank to be fitted into the medullary canal of the femur and which, in its proximal region, has a curvature in the AP plane with a center of curvature at its anterior that makes the shank more compatible to naturally existing conditions of the femur, permits a substantial increase in the shank thickness, reduces shank tendency to turn within the medullary canal, simplifies the prosthesis operating procedures and improves the association of the shank with the trochanter region of the femur.
Inventors
- 👤 Arnold Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:24
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2002/3678; A61F2002/3686; A61F2002/3688
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
In a hip joint prosthetic device comprising a rigid shank to be fitted into the medullary canal of the femur, a head, a end flange at the proximal end of the shank, a head and a neck section extending from the end flange to the head, the head being anteverted relative to the shank in the LM (lateral-medial) plane, the improvement wherein the shank has, in the proximal region therof, a section extending a distance between approximately 4-8 cm from the end flange which is curved in the AP (anterior-posterior) plane with a center of curvature in the AP plane anterior of the proximal region of the shank, wherein the axis of the shank at its proximal end extends, in the AP plane, approximately in the direction of the longitudinal axis of the neck section and wherein the shank has, in the distal region thereof, a section curved in the AP plane in the opposite direction to said proximal section.
Claim 2
Dependent Claim
160 words
In a hip joint prosthetic device comprising a rigid shank to be fitted into the medullary canal of the femur, a head, a end flange at the proximal end of the shank, a head and a neck section extending from the end flange to the head, the head being anteverted relative to the shank in the LM (lateral-medial) plane, the improvement wherein the shank has, in the proximal region therof, a section extending a distance between approximately 4-8 cm from the end flange which is curved in the AP (anterior-posterior) plane with a center of curvature in the AP plane anterior of the proximal region of the shank, wherein the axis of the shank at its proximal end extends, in the AP plane, approximately in the direction of the longitudinal axis of the neck section and wherein the shank has, in the distal region thereof, a section curved in the AP plane in the opposite direction to said proximal section.
Claim 3
Dependent Claim
31 words
A hip joint prosthetic device according to claim 1 wherein the axis of said curved section of shank has an angular change in direction in the AP plane of approximately 5°-10°.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |