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Related Experiment Videos

Systematic evaluation of ureteral access sheaths.

Manoj Monga1, Aaron Gawlik, William Durfee

  • 1Department of Urologic Surgery, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Urology
|May 12, 2004
PubMed
Summary

The Cook Flexor and Applied Forte XE ureteral access sheaths demonstrated superior resistance to buckling and kinking, respectively. Understanding these physical properties is crucial for optimal sheath performance during ureteroscopy.

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Area of Science:

  • Urology
  • Medical Devices
  • Biomedical Engineering

Background:

  • Ureteral access sheaths are essential tools in ureteroscopy.
  • Their physical characteristics can influence performance, potentially leading to complications like buckling or kinking.

Purpose of the Study:

  • To evaluate and compare the physical properties of various ureteral access sheaths.
  • To determine which sheath designs offer better resistance to buckling and kinking.

Main Methods:

  • Eight ureteral access sheaths were subjected to mechanical testing.
  • Buckling resistance was measured by load until catheter failure.
  • Kinking resistance was assessed by measuring diameter changes under load.
  • Frictional properties were evaluated using a standardized push test.

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Main Results:

  • The Cook Flexor sheath exhibited higher buckling resistance (202g force).
  • Cook Flexor and Applied sheaths demonstrated superior lubricity.
  • Applied Forte XE and Cook Flexor sheaths showed greater resistance to kinking.
  • Kinking correlated with a linear decrease in sheath diameter under load.

Conclusions:

  • Physical characteristics significantly impact ureteral access sheath performance.
  • Sheath design influences resistance to buckling during insertion and kinking during use.
  • This knowledge aids in selecting sheaths for improved patient outcomes in ureteroscopy.