Prosthetic terminal device
OwnerRobert Radocy, Ronald E. Dickinventors
Life of this patent
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Abstract
A voluntary closing prehensile prosthetic hand of laminated construction having a natural reaching and positive gripping action, innate biofeedback characteristics, and greater gripping strength and utility. The thumb member is a cable actuated, rotatable member, which is spring biased to return to the open position. An internal hook, three co-operating gripping surfaces, and two manual locking devices provide a variety of closed positions for holding different sized objects. The overall design, which imitates the action of the human forefingers and thumb, results in a refined gripping action while increasing reaching and grasping capabilities.
Claims10
A prosthetic, voluntary closing hand comprised of a wrist adaptor an index member extending therefrom, a thumb member pivoted to the index member, a bias spring engaging said thumb member to urge the thumb member to open position with respect to said index member, and a cable to urge said thumb member towards said index finger in closing position for hand grasping functions,
- (A) said index member having a movable thumb locking device mounted thereon, and a first inner surface defining three cooperating gripping surfaces extending along its length,
- (B) said thumb member having a plurality of locking receptacles for receiving said movable thumb locking device to selectively lock said thumb in a plurality of angular positions with respect to said index member, and a second inner surface facing said first inner surface defining three cooperating gripping surfaces along its length for cooperation with the index member gripping surfaces to grasp objects of different size and;
- (C) said wrist adapter incorporating a standard threaded bolt for attachment to wrist units found on standard arm prosthesis.
Dependencies are inferred from the claim text.