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Related Concept Videos

Urinary Bladder01:23

Urinary Bladder

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The urinary bladder is a hollow, muscular sac that temporarily stores urine before it is expelled from the body. It can hold approximately 600 mL of urine prior to micturition. The bladder is retroperitoneal and located behind the pubic symphysis in the pelvic floor.
In males, the bladder is situated in front of the rectum, while in females, it is positioned anterior to the vagina and uterus. The bladder floor contains an inverted triangular area called the trigone, defined by the two ureteric...
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Related Experiment Video

Updated: Mar 9, 2026

A Decentralized Ex Vivo Murine Bladder Model with the Detrusor Muscle Removed for Direct Access to the Suburothelium during Bladder Filling
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Suburothelial Bladder Contraction Detection with Implanted Pressure Sensor.

Steve J A Majerus1,2,3, Paul C Fletter1,3, Elizabeth K Ferry4,5

  • 1Advanced Pltatform Technology Center, Louis Stokes Veterans Affairs Medical Center, Cleveland, OH, United States of America.

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|January 7, 2017
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Summary
This summary is machine-generated.

A novel piezoelectric sensor shows promise for monitoring bladder pressure in neurogenic bladder patients. While erosion necessitates a wireless design, the sensor accurately detects bladder contractions, improving rehabilitation potential.

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Area of Science:

  • Biomedical Engineering
  • Urology
  • Medical Device Development

Background:

  • Effective management of bladder pressure is crucial for patients with neurogenic bladders to prevent complications like upper tract damage and incontinence.
  • Current methods for monitoring bladder contractions are often unsuitable for long-term or ambulatory use, limiting rehabilitation options.
  • A need exists for innovative, chronic monitoring solutions for bladder pressure.

Purpose of the Study:

  • To evaluate the efficacy of a novel piezoelectric catheter-free pressure sensor for detecting bladder contractions.
  • To assess the sensor's performance when placed in a suburothelial bladder location in animal models.

Main Methods:

  • Wired piezoelectric pressure monitor prototypes were implanted in feline and canine subjects (nonsurvival and one 13-day survival).
  • Vesical pressures were recorded from suburothelial and intraluminal sensor placements, compared against a standard pressure sensing catheter.
  • The survival animal's intravesical pressure was monitored for 10 days, followed by necropsy to evaluate implant migration and tissue erosion.

Main Results:

  • High correlation (r = 0.93±0.03) was observed between the novel sensor and reference catheter during stimulated bladder contractions in nonsurvival animals.
  • Excellent correlation (r = 0.98±0.02) was achieved when the device was placed within the bladder lumen.
  • While initial data from the survival animal was physiological, later recordings showed deterioration; however, end-stage intraluminal data still correlated (r = 0.85±0.13), despite significant implant erosion through the detrusor.

Conclusions:

  • The study demonstrates a significant correlation between suburothelial pressure readings and actual intravesical bladder pressures.
  • Device erosion observed during ambulatory monitoring highlights the need for a wireless implant design for future clinical applications.
  • A wireless version of this sensor holds potential for improving clinical rehabilitation in neurogenic bladder management.