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Does it matter, the shape of the bladder?

M S Damaser1, S L Lehman

  • 1Bioengineering Graduate Group, University of California, Berkeley 94720.

Neurourology and Urodynamics
|January 1, 1993
PubMed
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Urinary bladder shape affects its pressure-volume curve. Oblate spheroidal bladders are more compliant, but bladder fullness cannot be determined by pressure alone.

Area of Science:

  • Biomedical Engineering
  • Urology
  • Materials Science

Background:

  • The urinary bladder's pressure-volume (P-V) relationship is crucial for understanding bladder function.
  • Previous studies have not fully explored the influence of bladder geometry on its mechanical properties.

Purpose of the Study:

  • To investigate whether the pressure-volume curve of the urinary bladder is influenced by its shape.
  • To compare the compliance of spherical, prolate spheroidal, and oblate spheroidal bladders.

Main Methods:

  • Utilized identical materials to construct spherical, prolate spheroidal, and oblate spheroidal bladder models.
  • Measured and compared the pressure-volume curves across these different geometric configurations.

Main Results:

Related Experiment Videos

  • Oblate spheroidal bladders demonstrated significantly higher compliance compared to spherical and prolate spheroidal bladders.
  • In vivo capacity of normal oblate spheroidal bladders was not found to be greater than other shapes.

Conclusions:

  • Bladder shape is a significant factor influencing its pressure-volume characteristics and compliance.
  • Transmural bladder pressure alone is insufficient to accurately determine bladder fullness.
  • Geometric considerations are important in the biomechanical analysis of the urinary bladder.