Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arm or component and actuator or connector therefor
Patent
1992-07-08
1994-05-24
Green, Randall L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arm or component and actuator or connector therefor
623 59, 623 60, A61F 266, A61F 254, A61F 258
Patent
active
053145003
ABSTRACT:
An artificial manually positionable elbow joint for use in an upper extremity, above-elbow, prosthetic which provides a locking feature that is easily controlled by the wearer. The instant elbow joint is very strong and durable to withstand the repeated heavy loadings encountered by a wearer who works in an industrial, construction, farming or similar environment. The elbow joint of the present invention comprises a turntable, a frame, a forearm and a locking assembly. The frame generally includes a housing for the locking assembly and two protruding ears. The forearm includes an elongated beam having a cup-shaped cylindrical member at one end and a locking wheel having a plurality of holes along a circular arc on its other end with a central bore for pivotal attachment to the protruding ears of the frame. The locking assembly includes a collar having a central opening with a plurality of internal grooves, a plurality of internal cam members each having a chamfered surface at one end and a V-shaped slot at its other end; an elongated locking pin having a crown wheel with cam surfaces and locking lugs secured thereto; two coiled compression springs; and a flexible filament attached to one end of the elongated locking pin and extending from the locking assembly for extending and retracting the locking pin into the holes in the locking wheel to permit selective adjustment of the forearm relative to the frame. In use, the turntable is affixed to the upper arm part of the prosthetic (not shown) in the conventional manner and the cup-shaped cylindrical member on one end of the forearm is affixed to the forearm piece of the prosthetic (not shown) in the conventional manner. The elbow joint is easily adjusted and locked between maximum flex and extended positions.
REFERENCES:
patent: 1346092 (1920-07-01), Hullinger
patent: 1469431 (1923-10-01), Arnal
patent: 4636221 (1987-01-01), Kemp
Durability and Reliability of Externally Powered Elbow Protheses, Dated Apr. 25, 1991, National Easter Seal Society.
Broad, Jr. Robert L.
Green Randall L.
Manning John R.
Miller Guy M.
Nguyen Dinh X.
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