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[Extracorporeal lithotripsy using the HM3 Dornier lithotriptor and the modified HM3 lithotriptor]
Archivio Italiano Di Urologia, Nefrologia, Andrologia : Organo Ufficiale Dell'Associazione Per La Ricerca in Urologia = Urological, Nephrological, and Andrological Sciences
|December 1, 1989
Summary
The modified Dornier HM3 lithotripter offers effective kidney stone treatment with less anesthesia. This updated extracorporeal shock wave lithotripsy (ESWL) procedure shows comparable stone-free rates to older models.
Area of Science:
- Urology
- Medical Devices
- Nephrology
Background:
- Extracorporeal shock wave lithotripsy (ESWL) is a standard treatment for kidney and ureteral stones.
- The Dornier HM3 lithotripter has been a widely used device for this procedure.
Purpose of the Study:
- To compare the efficacy and treatment parameters of the original Dornier HM3 lithotripter with a modified version.
- To evaluate changes in anesthesia requirements and treatment outcomes between the two devices.
Main Methods:
- Retrospective analysis of 1034 patients treated with the original HM3 (1985-1987) and 466 patients with the modified HM3 (1988).
- Comparison of anesthesia types, number of shock waves, secondary treatment rates, and stone-free rates at three-month follow-up.
Main Results:
- Modified HM3 use significantly reduced general anesthesia from 97% to 2.4%, with 97.6% treated under anxiolytic/analgesic combinations.
- Average shock waves increased from 1900 (original) to 2300 (modified HM3).
- Secondary treatment rates increased from 10.3% to 17.4%, while stone-free rates were 85.6% (original) and 76.7% (modified HM3) at three months.
Conclusions:
- Low-energy lithotripsy with the modified semi-ellipsoid Dornier HM3 is effective for renal and ureteral calculi.
- The modified HM3 allows for less invasive treatments with comparable stone clearance to older high-pressure models, despite a higher need for retreatment.