The lithotrity of stones in the ureter under visual control.

The successful lithotrity of stones in the ureter under vision using electrohydraulic pressure waves is described. A 1.6-mm probe is guided, under visual control, to the concrement, which is then destroyed by a pressure wave released at the tip of the probe by a spark discharge. The apparatus itself has an impulse voltage of 1,800-2,000 V. The discharge energy is up to 5 W s. The impulse frequency can be adjusted between 10 and 80 Hz.