Patent US3975778A successfully refreshed from Google Patents.
US3975778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Total ankle arthroplasty
Assignee: Individual
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Filing: 1975-07-14
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Granted: 1976-08-24
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Expires: 1995-07-14
Abstract
Abstract A total ankle arthroplasty comprising a high-density polyethylene tibial unit having a concave surface forming a portion of a cylinder, a lower Vitallium talar unit having a convex bearing surface forming a portion of a sphere of a radius less than the radius of the concave surface of the tibial unit. The tibial unit has an upper portion provided with roughening, grooves and holes for improving the cementatious adherence between the tibial unit and the tibia. The talar unit has grooves and holes for also improving the cementatious adherence between the talar unit and the talus.
Inventors
- 👤 St. Elmo Newton, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:15
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4202; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/3082; A61F2002/30836; A61F2002/30878; A61F2002/30884; A61F2/46; A61F2002/4631; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
An ankle arthroplasty for a human being having a diseased, damaged, or otherwise malfunctioning tibia or talus, comprising: a tibial unit having an upper bonding surface adapted to be imbedded within the tibia and secured thereto, a lower talar unit having a lower surface adapted to be imbedded with the talus and secured thereto, and opposed, arcuate surface means on said tibial and talar units for providing at least arcuate sliding between the two units in a transverse vertical plane and arcuate fore and aft sliding movement in the sagittal plane, one of said opposed arcuate surfaces being a portion of a cyinder and the other being a portion of a sphere having a radius less than the radius of the cylinder portion, whereby one arcuate surface can rock on the other arcuate surface.
Claim 2
Dependent Claim
134 words
An ankle arthroplasty for a human being having a diseased, damaged, or otherwise malfunctioning tibia or talus, comprising: a tibial unit having an upper bonding surface adapted to be imbedded within the tibia and secured thereto, a lower talar unit having a lower surface adapted to be imbedded with the talus and secured thereto, and opposed, arcuate surface means on said tibial and talar units for providing at least arcuate sliding between the two units in a transverse vertical plane and arcuate fore and aft sliding movement in the sagittal plane, one of said opposed arcuate surfaces being a portion of a cyinder and the other being a portion of a sphere having a radius less than the radius of the cylinder portion, whereby one arcuate surface can rock on the other arcuate surface.
Claim 3
Dependent Claim
25 words
The ankle arthroplasty of claim 1, said lower talar unit including said convex spherical portion, said upper tibial portion having said concave, partially cylindrical portion.
Claim 4
Dependent Claim
50 words
The ankle arthroplasty of claim 1, said upper tibial unit having a large, concave, partially cylindrical surface, said lower talar unit having a convex, partially spherical surface of substantially smaller arcuate surface area than said partially cylindrical surface for clearing loose foreign matter away from said convex and concave surfaces.
Claim 5
Dependent Claim
148 words
A total ankle prosthesis for implantation between the tibia and talus, comprising: a tibial unit having an upper roughened portion for bonding to the tibia and a lower concave surface forming a portion of a cylinder and having its longitudinal axis lying generally in the sagittal plane, a talar unit having a lower roughened portion for bonding to the talus and an upper convex surface forming a portion of a sphere of a radius less than the radius of the arcuate portion of the tibial unit, and means for securing the tibial and talar units to the tibia and talus, respectively, with the concave surface of the tibial unit abutting and being generally centered against the convex surface of the talar unit, whereby the foot can be moved in flexion, extension, inversion and eversion through combined rocking, sliding and rotational relative movement of the tibial and talar units.
Claim 6
Dependent Claim
148 words
A total ankle prosthesis for implantation between the tibia and talus, comprising: a tibial unit having an upper roughened portion for bonding to the tibia and a lower concave surface forming a portion of a cylinder and having its longitudinal axis lying generally in the sagittal plane, a talar unit having a lower roughened portion for bonding to the talus and an upper convex surface forming a portion of a sphere of a radius less than the radius of the arcuate portion of the tibial unit, and means for securing the tibial and talar units to the tibia and talus, respectively, with the concave surface of the tibial unit abutting and being generally centered against the convex surface of the talar unit, whereby the foot can be moved in flexion, extension, inversion and eversion through combined rocking, sliding and rotational relative movement of the tibial and talar units.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |