1986 Volume 77 Issue 9 Pages 1400-1404
In the 2nd report, tensile strength of the surgical capsule in the hypertrophic prostate was measured. Using the same method, tensile strength of the normal prostatic tissue was measured in this study. The elasticity of the normal prostate was similar to that of the surgical capsule of the hypertrophic prostate with pathological residual urine.
From this result, the prostate might be able to be simulated by a balloon model consisting of a capsule, of which the physical property was similar to the measured one, and the content, of which the property was homogenous and liquid. The internal pressure in the balloon model at an early stage, that is, in the deflated balloon, was low. However, the internal pressure increased with expansion of the balloon volume, according to the law of Laplace.
Thus the simulated intraprostatic pressure in the normal prostate with a PCAR lower than 0.75 was low and that in the hypertrophic prostate with a PCAR higher than 0.75 was high. These results indicated that PCAR seemed to be one of the most important parameters representing the degree of urinary obstruction in benign prostatic hypertrophy patients.
