Importance

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Abstract

A pyramidal link-plate assembly for coupling a prosthetic limb upright assembly to another prosthetic limb component includes: a base plate member having a dome extending from a distal end and a cavity opening onto a distal apex of the dome, where the cavity includes a conically shaped portion with a diameter that widens with the distance from the distal apex of the dome; and a rotatable member which includes a substantially conically shaped body positioned within the conical portion of the cavity and which includes a frustopyramidal boss extending distally therefrom out through the opening in the distal apex of the dome. The conically shaped body of the rotatable member, positioned within the cavity, also widens with the distance from the distal apex of the dome. The boss is adapted to be received within an a central opening of a conventional annular coupling-socket. Set screws that extend radially into the central opening of the coupling socket are angled slightly distally so that when the set screws abut the outwardly angled faces of the frustopyramidal boss, further tightening of the set screws acts to pull the boss component in the distal direction, thereby causing the outer conical surface of the rotatable member's conically shaped body to press against the inner conical surface of the cavity. Accordingly, when the set screws are tightened, surface friction between the two complimentary conical surfaces prohibits further rotation of the rotatable member within the base plate member.

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First Claim