New equipment based on field gradient principle for measurement of cross sectional area of ureteral urine bolus has been developed. Inside the probe consisted of a Fr.4 ureteral catheter, there are 4 ring impedance electrodes and a bipolar ring ureteromyographic electrode. Ex vivo experiments has proved high values in reliability and reproducibility of obtained cross sectional area of urine bolus through an impedance method. Following results have been obtained through animal and clinical experiments. As urine bolus passed through the impedance electrodes, impedance represented the cross sectional area of urine bolus. The ureteral activity corresponded to the increase of urine flow changed as follows, ureteral peristaltic frequency increased, cross sectional area of urine bolus increased, length of urine bolus increased, during maximum diuresis, peristaltic activity diminished and continuous flow presented through ureteral column. It will be useful method for experimental or clinical evaluation of ureteral function.
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