[Modulit SL-20. Its development and clinical trial]

Modulit SZ-20 represents the third lithotriptor generation comprising the advantages of high disintegration efficacy, operation without anesthesia, combined system of ultrasonic and fluoroscopic localization of the concrements, provision with multifunctional platform. The impulse is generated by a cylindrical electromagnetic spiral with a paraboloid reflector. The waves go through a water cushion and impedance-adapted layer in which the patient is placed. Localization of the concrements is conducted by a special ultrasonic detector operating on-line, or fluoroscopically by an integrated arm C of the x-ray unit. In vitro and animal experiments have given evidence for high efficacy of the above lithotriptor, make it possible to evaluate dose-related and reversible renal trauma, to compare similar traumas induced by other lithotriptors. Since 1988 Modulit-SZ-20 has been tested for localization of nephroliths and ureteroliths. Then the attention of the designers was focused on concrement disintegration. After improving the X-ray guidance, the voltage of the generator, analysis of the experience gained, the percentage of disintegration has risen to 94. The authors achieved completed disappearance of the stones in 88% of their patients. SZ-20 Modulit proved effective against choleliths and stones in the biliary ducts as well. This device is recommended as high effective stone-crushing modality of the third generation.