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Related Experiment Videos

Endoscopic lithotripsy and the FREDDY laser: initial experience.

Francis Dubosq1, Federico Pasqui, Frédéric Girard

  • 1Urology Department, Tenon Hospital, Paris, France.

Journal of Endourology
|May 27, 2006
PubMed
Summary

The FREDDY laser shows promise for endoscopic lithotripsy, effectively treating many urinary stones with short hospital stays. However, it has limitations with certain stone types like cystine.

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Area of Science:

  • Urology
  • Laser Technology
  • Endourology

Background:

  • The frequency-doubled double-pulse neodymium:YAG (FREDDY) laser is a novel device for endoscopic lithotripsy.
  • It combines features of solid and dye lasers, utilizing a flexible optical fiber for ureterorenoscopy.
  • The FREDDY laser offers a potentially more affordable and lower-maintenance alternative to existing laser systems.

Purpose of the Study:

  • To evaluate the efficacy and role of the FREDDY laser in ureteroscopic treatment of urinary stones.
  • To assess its performance in a clinical setting for various stone types and locations.

Main Methods:

  • A FREDDY laser was used to treat 29 stones in 26 patients.
  • Stones treated included renal (13) and ureteral (16), with a mean size of 9 mm.

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  • Treatment success was defined as the absence of residual fragments on 3-month postoperative radiography.

    • Main Results:

    • Satisfactory results were achieved for 26 stones, with 69% of patients stone-free within 3 months.
    • Complete treatment was achieved for 72.4% of stones; however, 8 patients had residual fragments, particularly those larger than 10 mm.
    • Fragmentation was ineffective for 2 cystine stones and poor for one calcium oxalate monohydrate stone. Average hospitalization was 1.5 days.

    Conclusions:

    • Endoscopic FREDDY laser lithotripsy is effective and safe for urinary stones due to its wavelengths.
    • Its moderate cost and compatibility with flexible ureterorenoscopy make it a viable therapeutic option.
    • Limitations include reduced efficacy for cystine stones and inability to treat tissue lesions.