US3795922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complete knee prothesis
Assignee: Individual
•
Filing: 1972-11-17
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Granted: 1974-03-12
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Expires: 1992-11-17
Abstract
Abstract This prothetic device for replacing the articulation of a human knee comprises two elements adapted to be inserted the one into the femur and the other into the tibia, the femoral element having a female articulation portion adapted to be engaged by the male articulation portion of the tibial element so as to retain the latter, the male portion being releasably engageable into the female portion only when the two elements are disposed substantially at right angles to each other ; the design is such that a certain locking action is obtained in the fully stretched leg position and that during the flexion movement a certain degree of lateral movement is allowed.
Inventors
- 👤 J Herbert
- 👤 M Gros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3836; A61F2/3854; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30574; A61F2002/30576; A61F2002/30621; A61F2002/30649; A61F2002/3065; A61F2002/30652; A61F2/46; A61F2002/4631; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32114; Y10T403/32196; Y10T403/32213
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A prosthetic device for replacing the articulation of a human knee, which comprises two elements, on the one hand an upper female femoral element provided with an articular portion having a convex front wall adapted to carry the human knee ball and forming internally and behind said wall a cavity having a spherical contour opening downwards and backwards and, on the other hand, a lower male tibial element carrying at its upper end an integral articular portion comprising two opposite generally hemispherical portions interconnected by a cylindrical segment, said cavity and male integral articular portion being dimensioned so that said male articular portion is releasably engageable into said female femoral element only when the two elements are disposed at 90* to each other, but remaining locked therein in any other relative angular position in order to constitute an articulation that cannot be released while permitting flexion and extension movements as well as a slight lateral displacement as required for the normal plays of the articulation.
Claim 2
Dependent Claim
165 words
A prosthetic device for replacing the articulation of a human knee, which comprises two elements, on the one hand an upper female femoral element provided with an articular portion having a convex front wall adapted to carry the human knee ball and forming internally and behind said wall a cavity having a spherical contour opening downwards and backwards and, on the other hand, a lower male tibial element carrying at its upper end an integral articular portion comprising two opposite generally hemispherical portions interconnected by a cylindrical segment, said cavity and male integral articular portion being dimensioned so that said male articular portion is releasably engageable into said female femoral element only when the two elements are disposed at 90* to each other, but remaining locked therein in any other relative angular position in order to constitute an articulation that cannot be released while permitting flexion and extension movements as well as a slight lateral displacement as required for the normal plays of the articulation.
Claim 3
Dependent Claim
40 words
A prosthetic device as set forth in claim 1, wherein said spherical cavity of the femoral articular portion is open at the rear through a circle having the same diameter as the cylindrical segment of the male tibial articular portion.
Claim 4
Dependent Claim
149 words
Prosthetic device as set forth in claim 2, wherein said male articular portion comprises a relatively bulky pivot of substantially prismatic configuration with a trapezoidal base having antero-posterior major sides and two vertical faces, namely a front face and a rear face, the upper face of said pivot being divided into two segments, that is, a front segment inclined forwards and downwards, connected through an edge to the the front face and adapted to lock the device in the fully stretched position, and a rear segment carrying the articular portion consisting of the pair of opposite generally hemispherical portions interconnected by a cylindrical segment, said base having two lateral non-parallel trapezoidal faces, the two lateral non-parallel trapezoidal faces of said pivot acting as guide means for locking the joint laterally in the stretched-leg position thereof while permitting and limiting the lateral movements of the knee in the flexion position.
Claim 5
Dependent Claim
78 words
Prosthetic device as set forth in claim 3, wherein said male articular portion proper projects above said pivot of paralle lipipedic irregular configuration, and consists of a first generally hemispherical portion or cap, connected through a cylindrical segment to another, opposite generally hemispherical portion or cap, these two generally hemispherical portions or caps having the same curvature but different centres, whereby the vertical axis of the male articular assembly be shorter than the theoretical diameter of the sphere.
Claim 6
Dependent Claim
60 words
Prosthetic device as set forth in claim 4, wherein each male and female element carries a projecting plate to be located on the side of the articulation proper and a rear tongue extending at right angles to said plate and adapted to be fitted into the bony portion located behind in order to improve the fastening of the corresponding element.
Claim 7
Dependent Claim
53 words
Prosthetic device as set forth in claim 5, wherein each element carries an integral shank adapted to be fitted or driven into the femoral diaphysis or medullary groove and into the tibial diaphysis, said shank being disposed on the same side of the male or femal articular portion that said plate is located.
Claim 8
Dependent Claim
38 words
Prosthetic device as set forth in claim 1, wherein the walls of the articular portions of said elements are lined with thin layers of a suitable lubricant such as Teflon to prevent the seizing between the interfitting surfaces.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |