SYMPOSIA PAPER Published: 01 January 1994
STP18112S

Mechanical Properties and Modeling of the Stress-Strain Behavior of the Urinary Bladder

Source

A stretch test in vivo for living materials was newly developed and applied to the dog bladder. The stress-strain curve of the normal living bladder was a downward convex and rose very slowly. The curve showed hysteresis and speed-dependence. These results proved that the mechanical property of the urinary bladder was essentially viscoelastic.

A computer analysis, based on the viscoelastic simulation model proposed by Glantz, was performed to evaluate the mechanical property of the bladder. Both proportional and exponential stiffness elevated in the extirpated bladder. In the denervated bladder, changes of the constants were not significant immediately after cutting the pelvic nerves; however, the proportional stiffness elevated remarkably two weeks after cutting. Compared with these abnormal bladders, the elastic constants of the normal living bladder were very low. The viscoelastic properties of the bladder and its low elastic constants seemed to account for the normal bladder function as a reservoir for urine.

Author Information

Saitoh, M
Kyoto Prefectural University of Medicine, Kyoto, Japan
Ohnishi, K
Kyoto Prefectural University of Medicine, Kyoto, Japan
Matsuda, T
Kyoto Prefectural University of Medicine, Kyoto, Japan
Watanabe, H
Kyoto Prefectural University of Medicine, Kyoto, Japan
Yokobori, AT
Tohoku University, Sendai, Japan
Yokobori, T
Tohoku University, Sendai, Japan
Oki, F
Kyoto Prefectural University of Medicine, Japan
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Details
Developed by Committee: F04
Pages: 283–289
DOI: 10.1520/STP18112S
ISBN-EB: 978-0-8031-5261-8
ISBN-13: 978-0-8031-1894-2