Abstract: The present invention is a concept to provide a means of movement control for a powered prosthetic device. An externally detectable article is implanted on a biological site where the exertion of muscle tension will impart a movement of the article. The muscle can be attached to an antagonistic natural muscle or some means of exerting an opposing tension on the natural muscle. The recipient controlled tension in the appropriate muscle moves the externally detectable article and an external detector monitors that movement and generates control signals to the means powering the device in relation to the amount and direction of movement of the implanted article.

Abstract: Apparatus for detecting an abnormality such as a discontinuity in a predetermined region of a material by directing an elastic mechanical wave, such as an ultrasonic or other acoustic wave, in a series of pulses to portions of the region and providing response to the wave pulses reflected therefrom. The amplitudes of pulses reflected from a normal portion of the region may approximate the amplitudes of pulses reflected from a portion where an abnormality is present and thus make it difficult to distinguish between such portions.The directed wave is varied, as by rotating a transducer having an irregular cross-sectional radiation pattern, to provide randomlike variations in the shapes of successive pulses where reflected from a normal portion, differing detectably from any variations caused in the pulses where reflected from an abnormal portion.