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Avoiding a Lemon: Performance Consistency of Single-Use Ureteroscopes.

Brenton Winship1, Daniel Wollin2, Evan Carlos1

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This study compared two single-use flexible ureteroscopes, Pusen PU3022a and LithoVue, finding both offer consistent performance. Both devices demonstrated durable physical and optical characteristics, ensuring reliable outcomes for urologic procedures.

Keywords:
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Area of Science:

  • Urology
  • Medical Devices
  • Engineering

Background:

  • Reusable flexible ureteroscopes incur high repair costs, driving demand for single-use alternatives.
  • The performance consistency of emerging single-use flexible ureteroscopes is a critical concern for clinical adoption.

Purpose of the Study:

  • To compare the physical and optical performance consistency of two single-use flexible ureteroscopes: Pusen PU3022a and LithoVue.
  • To evaluate device durability through cyclic deflection testing.

Main Methods:

  • Evaluated 10 never-used Pusen PU3022a and 10 LithoVue ureteroscopes.
  • Measured maximal tip deflection, image resolution at varying distances, and irrigation flow rate.
  • Assessed deflection loss after 200 full deflection cycles.

Main Results:

  • Both ureteroscopes achieved over 270° maximal deflection; Pusen offered greater initial flexion.
  • LithoVue exhibited superior deflection retention after cyclic testing and higher resolution at 10mm.
  • Pusen provided higher irrigation flow despite a shorter working channel; variability was not significant between devices.

Conclusions:

  • The Pusen PU3022a and LithoVue single-use flexible ureteroscopes exhibit comparable "out-of-the-box" performance and durability.
  • Both devices demonstrate consistent performance, irrespective of the manufacturer, supporting their clinical utility.