Experience with a New Multifunctional Lithotripter, the Dornier MFL 5000: Results of 415 Treatments
The Dornier MFL 5000 is a new, multifunctional work station for urologie diagnosis, endourology and extracorporeal shock wave lithotripsy (ESWL*). Features of this bath-free device include a tiltable U-arm with an under-table x-ray tube for stone localization, a low-pressure generator with twin-pulse technique, modified semi-ellipsoid reflector, and an ultrasound unit for stone localization and monitoring. From April 1988 until January 31, 1989, 415 ESWL treatments were performed. The stones were 45.6% (189) calyceal, 25% (108) renal pelvis, 26% (108) ureteral, and 2.4% (10) branched calculi. The majority of stones had a diameter between 8 mm and 20 mm. Stone disintegration required a mean of 2,450 impulses. Mean treatment time was 33 minutes. Mean final generator voltage was 20 kV (range, 17 kV to 24 kV). Post-ESWL ancillary procedures proved to be necessary in 24 patients (5.8%). The retreatment rate was 19.5% (81) including 4.8% (20) with planned multiple treatments. In 86.6% (359) of patients a noninvasive oral analgesia technique was used successfully. Follow-up at three months could be obtained in 59.5% (247). Overall stone-free rate was 77.5% (191). ESWL was unsuccessful in 2.4% (10).
The results of this study are comparable to those achieved with a modified Dornier HM3. The MFL 5000 has advantages, especially in the treatment of lumbar ureteral stones in situ, less radiopaque stones, and in obese patients. The under-table x-ray tube considerably reduces radiation exposure to room personnel and the treating urologist. Excellent imaging qualities are provided by the 14-inch image intensifier. The MFL 5000 proved to be satisfactory for a variety of endourologic procedures.
KeywordsExtracorporeal Shock Wave Lithotripsy Ureteral Stone Percutaneous Nephrolithotomy Excellent Imaging Quality Stone Localization
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