Surgery – Truss – Perineal
Patent
1984-07-10
1986-08-05
Crowder, Clifford D.
Surgery
Truss
Perineal
623 39, A61F 500
Patent
active
046036903
ABSTRACT:
A joint structure for a knee brace in which the axis around which motion takes place is not fixed but rather simulates that of the natural joint, lengthening and shortening with it. The joint structure includes two slidably-coupled joint elements, the lower one of which has a ramp member and a pair of furcations. The head of the upper joint element is received between these furcations and connected thereto by a pin which passes through an elongated slot formed in the head. As the joint elements rotate toward each other from their fully extended position, the pin slides from the upper to the lower end portion of the slot, increasing the overall length of the joint structure with flection as does the human knee joint.
The radius of curvature of the forward portion of the lower edge surface of the upper joint element, simulating a short cross-section of the lower surface of the condyle of the human knee joint when viewed in profile, is shared by a concave edge surface on a portion of the ramp member which is recessed between the pair of furcations and by the curved edge surfaces of the central portion of the slot. As the pin returns to engage the upper end portion of the slot, the lower edge surface of the upper joint element is brought into contact with substantially the entire length of the concave edge surface, thereby locking the joint structure against hyperextension, preventing its accidental folding when a wearer shifts his weight onto a weakened knee joint while standing, and providing him with positive control of the movement of the joint during walking.
REFERENCES:
patent: 3552786 (1971-01-01), Schmid
Crowder Clifford D.
Leon Harry I.
Leon V. L.
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