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A new optical coupling control technique and application in SWL.

Jian Lin Lv1

  • 1Department of Urology, Affiliated Jiangning Hospital, Nanjing Medical University, Gushan Road 168, Nanjing, 211100, China. ljlxx01@163.com.

Urolithiasis
|March 31, 2016
PubMed
Summary

Optical coupling control (OCC) significantly improved shock wave lithotripsy (SWL) outcomes for renal stones, increasing stone-free rates compared to "blind" coupling. This suggests OCC should be a standard feature for optimizing SWL treatments.

Keywords:
Clinical experienceOptical coupling controlSWL

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Area of Science:

  • Urology
  • Nephrology
  • Medical Devices

Background:

  • Shock wave lithotripsy (SWL) is a common procedure for treating renal and ureteral stones.
  • The effectiveness of SWL can be influenced by the coupling method used to transmit shock waves.
  • Optical coupling control (OCC) offers a potential method to optimize energy transmission during SWL.

Purpose of the Study:

  • To compare the stone-free rates (SFRs) and treatment outcomes of SWL using optical coupling control (OCC) versus "blind" coupling.
  • To evaluate the incidence of complications associated with each coupling method during SWL for renal stones.

Main Methods:

  • A randomized controlled study involving 336 patients undergoing SWL for renal stones between January 2014 and February 2015.
  • Patients were randomized into two groups: Group A (OCC) and Group B ("blind" coupling).
  • Stone-free rates were assessed 3 months post-treatment using KUB film and ultrasonography; treatment failure and complications were recorded.

Main Results:

  • Patients treated with OCC (Group A) achieved significantly higher overall stone-free rates (78.2% for kidney, 81.7% for ureteral stones) compared to the "blind" coupling group (Group B) (62.8% for kidney, 67.9% for ureteral stones).
  • Statistically significant differences (P < 0.05) in treatment results were observed between the two groups across various stone locations.
  • The OCC group demonstrated better treatment outcomes, with lower rates of re-treatment and ancillary procedures compared to the "blind" group.

Conclusions:

  • Optical coupling control (OCC) significantly enhances the effectiveness of SWL for treating renal and ureteral stones.
  • OCC facilitates optimal shock wave transmission, leading to improved treatment outcomes and potentially reduced adverse effects.
  • The study recommends that OCC should be considered a standard feature in future lithotripsy devices.