[First clinical trials of a new endoscopic lithotriptor with ballistic energy (Waltz EL 25 Combilith)]

The Waltz Combilith EL 25 is an endoscopic lithotriptor equipped with an electrohydraulic and ballistic function. The device which generates the ballistic energy is a hand-piece in which a projectile, driven by an electromagnet, strikes a metal rod which transmits the energy to the stone. The diameter and length of the rod are adapted to the site of the stone (bladder + kidney: 1.7 mm rod; ureter: 0.8 mm rod). 29 stones in 25 patients with a mean age of 43 years (range: 25-72) were treated using ballistic energy: 22 ureteric stones (mean dimensions: 9 x 6 mm), 2 renal stones (mean dimensions: 20 x 30 mm) and 5 bladder stones (mean dimensions: 15 mm). Satisfactory stone fragmentation was obtained for 26 of the 29 stones (89.6%) with a mean fragmentation time of 142 seconds. One minimal ureteric perforation was observed (cure without sequelae after drainage by a double J stent). The Combilith EL 25 presents an excellent efficacy/safety ratio and can be used throughout the urinary tract.