Comparative analysis of cylindrical and multi-sectional ultra sonic irradiators for intra-cavity treatment

Results of the comparative analysis of two ultrasonic irradiators (USI) for intracavity treatment are presented. The first USI is multisection consisting of 4 peizoceramic plates placed on lateral surface of a flexible medical catheter parallel to each other. The second USI is a piezoceramic cylinder built in the same catheter. It is shown that 4-section irradiator provides lower intensity compared with the cylinder irradiator. Non-uniformity of intensity distribution over the lateral surface of the cavity for 4-section irradiator reaches 25% in 1 mm thickness biological tissue (the cylinder irradiator has non-uniformity close to 0%). With increase of biological tissue thickness the intensity of 4-section USI decreases faster and its non-uniformity decreases as well. For the thickness of 5 mm intensities of both USI are almost equal. With increase of tissue exposition time the resistance of the tissue changes more under irradiation of the cylinder USI.