Abstract: A therapeutic ultrasonic device which will transmit multiple ultrasonic frequencies through one ultrasonic applicator. The applicator includes a handle; two diaphragms connected to one end of the handle with each diaphragm having an applicating face directed away from the handle and a rear face directed into the handle so that the applicating faces may be independently applied to a patient during therapy; and at least two piezoelectric crystals. A piezoelectric crystal is connected to the rear face of each diaphragm for converting periodic electrical energy into ultrasonic energy and transmitting the ultrasonic energy through the diaphragm to which the crystal is connected independently of the other diaphragm.

Abstract: Sonic transducer and method for making the same. A sonic transducer of the type used in generating ultrasound frequencies for medical therapy includes a substantially planar circular piezoelectric crystal which is bonded to the rear surface of a circular metal diaphragm. The diaphragm front surface includes a substantially planar applicating face and an annular non-parallel surface surrounding the applicating face. The transducer may be excited to produce maximum ultrasound energy over a relatively broad frequency range.