Hand muscle contraction measurement appts. - has miniature force transducer attached to positioner and thumb ring with wrist and palm immobilised belts

摘要

The universal arm board for hand and forearm fixation is provided to expose part of the forearm at the wrist for the attachment of electrodes for stimulating the ulnar nerve. The palm rests on the arm board and is fixed in position assuring immobility of the fingers and leaving free only movement of the thumb, positioned in a thumb ring. The wrist is immobilised by a belt with a Velcro lock leaving free the exposed part of the palmar side of the forearm at the wrist for ulnar nerve stimulation. A force-transducer positioner is attached to the arm board. The positioner allows adjustments to any position reqd. by the anatomical differences of the thumb-hand angle and allows changes in the resting tension of the adductor pollicis muscle. The output signal from the force transducer is proportional to the force of thumb adduction prod. by increased isometric tension in the adductor pollicis muscle evoked by stimulation of the ulnar nerve at the wrist.