Abstract: The invention corresponds to a device used in conjunction with a resectoscope in endoscopic surgical operations which includes a housing, pumping means, means for controlling, measuring and displaying the speed of said pumping means in order to make corrections in the inflow and outflow rate of irrigating fluid from the patient thereby maintaining a constant distention of the bladder. The device also includes a plurality of audio-visual alarms that alert the operating physician to any abnormal condition.