Summary
The electrical and acoustic output created by the spark discharge for electrohydraulic lithotripsy at the tip of a 3.3-F probe was evaluated. Spark generation was achieved by variable combinations of voltage and capacity. The effective eletrical output was determined by means of a high-voltage probe, a current coil and a digital oscilloscope. Peak pressures, rise times and pulse width of the shock waves were recorded using a polyvinylidene difluoride needle hydrophone in 0.9% NaCl solution at a distance of 10 mm. The effective electrical output is lower than the calculated output, due to inductivities, capacities and resistances of the cables and plugs. The life of the probes is markedly shorther when a combination of high voltage and low capacity is used than with low voltage and high capacity corresponding to the same energy. The peak pressure and the slope of the shock front depend solely on the voltage, while the pulse width is correlated with the capacity. The pulse intensity integral of the shock wave is likely to be the best equivalent to the applied energy.
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References
Angeloff A (1972) Hydro electrolithotripsy. J Urol 108:867
Begun FP, Jacobs SC, Lawson RK (1988) Use of prototype 3F electrohydraulic electrode with ureteroscopy for treatment of ureteral calculous disease. J Urol 139:188
Coleman AJ, Saunders JE (1989) A survey of the acoustic output of commercial extracorporeal shock wave lithotripters. Ultrasound Med Biol 15:213
Eaton JM, Malin JM, Glenn JF (1972) Electrohydraulic lithotripsy. J Urol 108:865
Goodfriend R (1984) Ultrasonic and electrohydraulic lithotripsy of ureteral calculi. Urology 23:5
Green DF, Lytton B (1985) Early experience with direct vision electrohydraulic lithotripsy of ureteral calculi. J Urol 133:767
Lamport H, Newman HF (1984) Ultrasonic lithotresis in the ureter. J Urol 76:520
Marberger M (1983) Disintegration of renal and ureteral calculi with ultrasound. Urol Clin North Am 10:729
Reuter HJ (1970) Electronic lithotripsy: transurethral treatment of bladder stones in 50 cases. J Urol 104:834
Reuter HJ, Kern E (1973) Electronic lithotripsy of ureteral calculi. J Urol 110:181
Schoborg TW (1989) Efficacy of electrohydraulic and laser lithotripsy in the ureter. J Endourol 3:361
Vorreuther R, Engelking R (1992) Features and acoustic output of five different electrohydraulic lithotripters for endoureteral stone treatment. J Endourol (in press)
Vorreuther R, Engelking R (1992) Minimal invasive Ureteroskopie und elektrohydraulische Lithotripsie. Urologe [A] 2: (in press)
Watson G, Murray S, Dretler SP, Parrish JA (1987) The pulsed dye laser for fragmenting urinary calculi. J Urol 138:195
Watson G, Murray S, Dretler SP, Parrish JA (1987) An assessment of the pulsed dye laser for fragmenting calculi in the pig ureter. J Urol 138:199
Willscher MK, Conway JF, Babayan RK, Morrisseau P, Sant GR, Bertagnoll A (1988) Safety and efficacy of electrohydraulic lithotripsy by ureteroscopy. J Urol 140:957
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Vorreuther, R., Engelking, R. Impact of voltage and capacity on the electrical and acoustic output of intracorporeal electrohydraulic lithotripsy. Urol. Res. 20, 355–359 (1992). https://doi.org/10.1007/BF00922748
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DOI: https://doi.org/10.1007/BF00922748