Patent FR1083351A successfully refreshed from Google Patents.
US3696446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Total knee prosthesis
Assignee: ASS de l ECOLE CATHOLIQUE D AR
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Filing: 1971-01-29
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Granted: 1972-10-10
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Expires: 1991-01-29
Abstract
Abstract This prosthesis of the knee permits the tibial pivoting movements with due consideration for the two types of rotation, i.e. the systematic inward rotation accompanying the knee flexion and stretching, and the free rotation which can take place only after about 20* of flexion from the normal position of the tibia, the latter being inclined outwards in the stretched knee position, with respect to the thigh-bone extension.
Inventors
- 👤 Gilles Bousquet
- 👤 Andre Rambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:32
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3836; A61F2/3854
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
175 words
Complete prosthesis for the knee, of the type comprising two respectively upper and lower members pivotally interconnected and each provided with a rod permitting the sealing of these members to the lower end of the thigh-bone and to the upper end of the tibia, respectively, each member aforesaid having a longitudinal axis and being provided with a transverse bearing plate adapted properly to distribute the stress throughout the cross-sectional area of said thigh-bone and tibia, wherein the pivotal interconnection comprises a spherical element rigid with the upper member and engaging a part-spherical bearing concavity formed in said lower member, means for producing the systematic inward rotation of the lower member about its said axis during the antero-posterior flexion of the knee, other means for limiting to the desired values the free inward and outward movements of rotation of said lower member about its said axis, and third means adapted to impart the normal angular position between said lower and upper members as compared to the tibia in relation to the thigh-bone in the stretched-leg position.
Claim 2
Dependent Claim
175 words
Complete prosthesis for the knee, of the type comprising two respectively upper and lower members pivotally interconnected and each provided with a rod permitting the sealing of these members to the lower end of the thigh-bone and to the upper end of the tibia, respectively, each member aforesaid having a longitudinal axis and being provided with a transverse bearing plate adapted properly to distribute the stress throughout the cross-sectional area of said thigh-bone and tibia, wherein the pivotal interconnection comprises a spherical element rigid with the upper member and engaging a part-spherical bearing concavity formed in said lower member, means for producing the systematic inward rotation of the lower member about its said axis during the antero-posterior flexion of the knee, other means for limiting to the desired values the free inward and outward movements of rotation of said lower member about its said axis, and third means adapted to impart the normal angular position between said lower and upper members as compared to the tibia in relation to the thigh-bone in the stretched-leg position.
Claim 3
Dependent Claim
49 words
Prosthesis as set forth in claim 1, wherein the front edge of the upper member bearing plate has secured thereto a guide plate formed with an external groove inclined by 10* in relation to the axis of the rod of the upper member and adapted to guide the patella.
Claim 4
Dependent Claim
128 words
Prosthesis as set forth in claim 1, wherein the means for producing the systematic inward rotation of the lower member about its axis, during the antero-posterior flexion of the knee, comprise a spindle extending diametrally through said spherical element rigid with the upper member, the projecting portions of said spindle acting as trunnions and engaging bearing-forming elongated apertures formed perpendiCularly to said axis in upstanding lateral flanges rigid with said lower member, said flanges being disposed on opposite sides of said part-spherical concavity, and a guide stud carried by said concavity projecting radially into a groove formed with an at least partially helical configuration in said spherical element through substantially 120* about the spindle extending through said spherical element, to permit the knee flexion with the normal amplitude.
Claim 5
Dependent Claim
69 words
Prosthesis as set forth in claim 3, wherein said groove formed in the spherical element comprises three successive sections, namely a first section extending along the first 30* and having a gradient of the order of 6*, a second or intermediate section covering the next 30* and having a gradient of the order of 4*, and finally a third section extending along the last 60* with a zero gradient.
Claim 6
Dependent Claim
96 words
Prosthesis as set forth in claim 4, wherein said means for limiting to the desired values the free inward and outward rotational movements of said lower member about its axis consist of a boss formed on said bearing plate having ends extending to opposite sides of said spherical element, said boss being normally engaged between the front edges of the ends of the upstanding flanges supporting the spindle extending diametrally through said spherical element, the clearance provided between each end of said boss and the corresponding lateral flange determining the value of the permissible free rotation.
Claim 7
Dependent Claim
82 words
Prosthesis as set forth in claim 5, wherein the normal angular relationship between the lower and upper members, in the stretched knee position, is maintained by said spindle disposed diametrally through said spherical element being inclined by an angle of 80* in relation to the axis of the rod rigid with the upper member, in order to impart in the stretched-knee position an outward inclination of about 10* to the tibia axis with respect to the downward extension of the thigh-bone axis.
References Cited (Backward Citations)
FR1122634A
Cited
US3506982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |