1978 Volume 69 Issue 5 Pages 543-547
A specially designed apparatus for withdrawing a urethral catheter at a constant speed is described. This apparatus consists of two principal components; one is a DC-motor controlling circuit and the other is a marker system which automatically monitors the location of the catheter in the urethra. Using this apparatus, examinations were carried out to study the reproducibility of urethral pressure profile, and the results were as follows.
1) From the bladder neck to the UPmax, the error in reproducibility was small as seen from a small standard deviation.
2) Beyond the UPmax, the error in reproducibility increased.
3) At the withdrawal speed of 25, 50, and 100mm/min, no remarkable change of the error in reproducibility was observed.
