US3846846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hip joint prosthesis
Assignee: Individual
•
Filing: 1973-09-26
•
Granted: 1974-11-12
•
Expires: 1993-09-26
Abstract
Abstract A ball-shaped portion is to form part of the hip joint and a second portion extends from this ball-shaped portion and is to be inserted into an opening in an human femur. The second portion is provided with a passage through which an elongated expander rod is extended which is also to be inserted into the opening of the femur, and on the expander rod is arranged a series of expansion elements in form of a row which, as the expander rod is moved longitudinally of the row, are all expanded to anchor the prosthesis in the femur.
Inventors
- 👤 A Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:21
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30205; A61F2002/30217; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30476; A61F2002/30507; A61F2002/30535; A61F2002/30579; A61F2002/30594; A61F2002/30599; A61F2/30767; A61F2/30771; A61F2002/30836; A61F2/3609; A61F2002/3611; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0063; A61F2230/0067; A61F2250/00; A61F2250/0058; A61F2250/006; A61F2250/0063; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
124 words
A hip joint prosthesis, comprising first means, including a ball-shaped portion which is to form part of a hip joint, and a second portion which is to be inserted into a human femur and extends from said first portion; and second means for anchoring said second portion in the femur, comprising an elongated expander rod inserted through said second portion and insertable into the femur longitudinally thereof, a row of tubular expansion elements each surrounding said rod and being angularly displaceable with reference to the longitudinal axis of the same, and actuating means on said expander rod for effecting axial movement of said rod with reference to said row and for thereby causing expansion of said expansion elements into anchoring contact with the femur.
Claim 2
Dependent Claim
124 words
A hip joint prosthesis, comprising first means, including a ball-shaped portion which is to form part of a hip joint, and a second portion which is to be inserted into a human femur and extends from said first portion; and second means for anchoring said second portion in the femur, comprising an elongated expander rod inserted through said second portion and insertable into the femur longitudinally thereof, a row of tubular expansion elements each surrounding said rod and being angularly displaceable with reference to the longitudinal axis of the same, and actuating means on said expander rod for effecting axial movement of said rod with reference to said row and for thereby causing expansion of said expansion elements into anchoring contact with the femur.
Claim 3
Dependent Claim
39 words
A prosthesis as defined in claim 1, said rod having a leading end provided with an expander portion; and said row including a leading expansion member into which said expander portion is drawn in response to said axial movement.
Claim 4
Dependent Claim
50 words
A prosthesis as defined in claim 2, wherein each of said elements has a leading end and a trailing end, a center passage through which said rod extends which conically diverges towards said leading end, and a slot in its peripheral wall extending from said leading towards said trailing end.
Claim 5
Dependent Claim
73 words
A prosthesis as defined in claim 2, wherein each of said elements has a leading end and a part-spherical trailing end, and a center passage through which said rod extends and which conically diverges towards said leading end, said trailing end of each of said elements extending into said center passage at the leading end of the respective axially adjacent element for expanding the latter, in response to said movement of said rod.
Claim 6
Dependent Claim
22 words
A prosthesis as defined in claim 4, wherein said elements have an exterior configuration which coaxially converges toward the respective leading end.
Claim 7
Dependent Claim
16 words
A prosthesis as defined in claim 1, wherein said elements have outer surfaces which are roughened.
Claim 8
Dependent Claim
37 words
A prosthesis as defined in claim 1, wherein said row includes a leading and a trailing element; and wherein at least said trailing element has an exterior configuration which conically converges in direction towards said leading element.
Claim 9
Dependent Claim
30 words
A prosthesis as defined in claim 1, the femur having a curved internal channel; and wherein said rod is curved in longitudinal direction for facilitating its accommodation of said channel.
Claim 10
Dependent Claim
54 words
A prosthesis as defined in claim 1, said second portion having an inner end remote from said first portion; and wherein said row includes a leading element, and a trailing element which is adjacent said second portion, said trailing element having an end face provided with a recess into which said inner end extends.
Claim 11
Dependent Claim
47 words
A prosthesis as defined in claim 1, said second portion extending at an angle to said first portion and having a bore for said rod, and a surface which faces outwardly from the femur; and said rod having an outer end adapted to bear against said surface.
Claim 12
Dependent Claim
70 words
A prosthesis as defined in claim 1, said second portion extending at an angle to said first portion and having a bore for said rod, and a surface which faces outwardly away from the femur; said rod having a trailing portion provided with screw threads; and further a cap nut threadedly engageable with the screw threads of said trailing portion and provided with a head which bears against said surface.
Claim 13
Dependent Claim
44 words
A prosthesis as defined in claim 11, wherein said cap nut has an axial length which is at least equal to thE distance through which said rod must be moved with reference to said row in order to cause said expansion of said elements.
Claim 14
Dependent Claim
36 words
A prosthesis as defined in claim 1, wherein said elements each have a center passage through which said rod extends, said passages and said rod having respective non-circular mating cross-sections for preventing undesired relative angular displacement.
References Cited (Backward Citations)
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |