Abstract: A method and an apparatus for applying a therapeutic substance to body tissue are provided in which ultrasonic radiation is used. The method allows the application of medication to be tailored to the needs of an individual patient. In particular, the timing, duration, intensity, and concentration of the application of medication can be adjusted according to individual requirements. Side effects of tissue adjacent to tissue in need oThe invention described herein was made in the course of work under a grant from the National Institute of Health.

Abstract: An ultrasonic transducer assembly is provided with transducers for both therapeutic and diagnostic ultrasonic radiation. A moveable seal permits adjustment and alignment of the two transducer units in a fluid medium. In addition, there is provided a light beam directed along the axis of the ultrasonic radiation. The transducer assembly is particularly useful for ophthalmic therapy.

Abstract: A pacemaker training aid for use in explaining the conduction system of the heart and the therapy provided by the use of a pacemaker, utilizes an illustration of the heart having lights associated therewith to show the sequence of transmission of command signals that normally cause proper action of heart chambers; the sequence of transmission of command signals usually present during improper or abnormal operation of the heart; and the effect of a pacemaker on such irregularities.The lights are mounted at various predetermined locations on or behind the illustration in order to simulate the location of various physiological entities; the illustration is usually in the form of a color transparency. A means for controlling the sequence of illumination is provided. The sequence is determined by the normal or irregular cardiac condition which it is desired to illustrate.