Patent US4215441A successfully refreshed from Google Patents.
US4215441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic hip
Assignee: Medical Center Prosthetics Inc
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Filing: 1979-02-12
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Granted: 1980-08-05
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Expires: 1999-02-12
Abstract
Abstract A prosthesis for replacement of a hip joint is flexion biased so that the prosthetic limb members affixed thereto are urged anteriorly of the body with the prosthetic foot off the ground. Thus, when the prosthetic hip joint is used with the weight activated knee joint, the flexion biasing provides swing phase motion to the leg from energy stored in the biasing member during the stance phase of that leg.
Inventors
- 👤 Michael T. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:22
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2/64; A61F2/605; A61F2002/5001
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
A flexion biased prosthesis comprising: an upper limb pylon; a bearing plate adapted for mounting on a hip socket; said bearing plate pivotally affixed to the superior end of said upper limb pylon; flexor means for flexing said upper limb pylon relative said bearing plate whereby with said bearing plate fixed to a hip socket said upper limb pylon is flexed forwardly of the frontal plane.
Claim 2
Dependent Claim
66 words
A flexion biased prosthesis comprising: an upper limb pylon; a bearing plate adapted for mounting on a hip socket; said bearing plate pivotally affixed to the superior end of said upper limb pylon; flexor means for flexing said upper limb pylon relative said bearing plate whereby with said bearing plate fixed to a hip socket said upper limb pylon is flexed forwardly of the frontal plane.
Claim 3
Dependent Claim
25 words
The flexion biased prosthesis of claim 1 further comprising a weight actuated prosthetic knee joint affixed to the inferior end of the upper limb pylon.
Claim 4
Dependent Claim
20 words
The flexion prosthesis prostheseis of claim 1 wherein the bearing plate extends outwardly and rearwardly of the upper limb pylon.
Claim 5
Dependent Claim
16 words
The flexion biased prosthesis of claim 3 wherein the flexor means comprises a resilient compression member.
Claim 6
Dependent Claim
46 words
The flexion biased prosthesis of claim 4 wherein the flexor means further comprises a rigid member affixed at one end to the end of the bearing plate distal of the upper limb pylon, said rigid member associated at its other end with the resilient compression member.
Claim 7
Dependent Claim
59 words
The flexion biased prosthesis of claim 5 wherein the resilient compression member comprises a helical spring disposed about the upper limb pylon, said prosthesis further comprising a first collar adjustably affixed to the upper limb pylon said helical spring in abutting engagement with said collar and extending along said upper limb pylon in a superior direction from said collar.
Claim 8
Dependent Claim
27 words
The flexion biased prosthesis of claim 6 further comprising a second collar slidably disposed about the upper limb pylon between the helical spring and the bearing plate.
Claim 9
Dependent Claim
24 words
The flexion biased prosthesis of claim 7 wherein the other opposite end of the rigid member engages the superior end of the second collar.
Claim 10
Dependent Claim
23 words
The flexion biased prosthesis of claim 8 further comprising a retaining bail affixed to the rigid member and surrounding the upper limb pylon.
Claim 11
Dependent Claim
25 words
The flexion biased prosthesis of claim 9 further comprising a weight actuated prosthetic knee joint affixed to the inferior end of the upper limb pylon.
Claim 12
Dependent Claim
48 words
The flexion biased prosthesis of claim 2 or claim 10 further comprising a lower limb pylon and a prosthetic foot, said lower limb pylon affixed to the inferior side of the weight actuated prosthetic knee, said prosthetic foot affixed to the inferior end of said lower limb pylon.
Claim 13
Dependent Claim
28 words
The flexion biased prosthesis of claim 1 or claim 10 further comprising restraining means for inhibiting pivotal movement of said upper limb pylon forwardly from the frontal plane.
Claim 14
Dependent Claim
24 words
The flexion biased prosthesis of claim 2 or claim 10 further comprising second restraining means for inhibiting flexion of the weight activated prosthetic knee.
Claim 15
Dependent Claim
52 words
A flexion biased prosthesis comprising: a hip socket; an upper limb pylon; a bearing plate affixed to said hip socket; a hinge pivotally affixing said upper limb to said bearing plate; flexor means for flexing said upper limb pylon relative said bearing plate forward of the frontal plane of said hip socket.
Claim 16
Dependent Claim
52 words
A flexion biased prosthesis comprising: a hip socket; an upper limb pylon; a bearing plate affixed to said hip socket; a hinge pivotally affixing said upper limb to said bearing plate; flexor means for flexing said upper limb pylon relative said bearing plate forward of the frontal plane of said hip socket.
Claim 17
Dependent Claim
25 words
The flexion biased prosthesis of claim 14 further comprising a weight actuated prosthetic knee joint affixed to the inferior end of the upper limb pylon.
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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |