Abstract
The usage of shockwave devices permanently expands from initially lithotripsy to orthopedics and perhaps to drug-delivery in future applications. This demands more compact and cheaper but still powerful shockwave devices, which should generate reproducible sound fields and should be adjustable in some way to the special requirements of the therapy. Here several self-focusing piezoelectric transducers based on a double-layer piezo technology are presented. Sound field measurement results show that it is possible to obtain maximal peak pressure amplitudes from 58 to 132 MPa from small to medium sized sources with diameters of aperture ranging from 70 to 220 mm. The peak pressure amplitude and the amount of energy delivered to the focal region can be adjusted in a wide range. Clinical results demonstrate the therapeutic effectiveness for the treatment of orthopedic indications. These compact devices have the ability to meet the requirements of an extended range of therapeutic applications.
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