Piezoelectric Lithotripsy: Initial Experience with the Wolf Piezolith 2200

Abstract

Extracorporeal piezoelectric lithotripsy (EPL) with the Wolf Piezolith 2200 offers the major advantage of low-power lithotripsy. The relatively low pressures of the shock wave combined with a small (4 mm × 8 mm) focal point allow for pain-free lithotripsy.

In our initial experience with the Piezolith 2200, 25 stones (average size 7 mm × 10 mm) in 22 patients have been treated. All stones were successfully targeted with a sonographic stone localization system. At a minimum of one-month follow-up in 11 patients, 73% of patients were stone free after receiving an average of 2,880 shock waves. Approximately one-third of patients required a repeat lithotripsy procedure. None of the patients required anesthesia or analgesia during treatment. Postoperative complications included obstructing fragments in three patients, one of which necessitated ureteroscopic stone manipulation.

We conclude that the Piezolith 2200 affords the urologist the advantage of anesthesia-free lithotripsy with efficacy comparable to currently available lithotripters. In addition, this form of low-power lithotripsy may prevent possible long-term side effects.