Laser fragmentation of renal calculi

Area of Science:

• Urology
• Laser Medicine
• Biomedical Engineering

Background:

• Urinary calculi (stones) pose a significant clinical challenge.
• Current fragmentation techniques can leave residual stone fragments.
• Minimally invasive stone removal is a key goal in urology.

Purpose of the Study:

• To evaluate the efficacy of pulsed Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) lasers for urinary stone fragmentation.
• To assess the size and extractability of laser-generated stone fragments.
• To explore the potential of laser fiber technology for endoscopic urinary stone treatment.

Main Methods:

• Utilized pulsed Nd:YAG laser system for stone fragmentation in an air medium.
• Analyzed fragment size and characteristics post-laser treatment.
• Investigated the transmission of laser energy through flexible glass fibers compatible with endoscopic instruments.

Main Results:

• Pulsed Nd:YAG laser rapidly fragmented all tested urinary calculi types.
• Generated fragments were significantly smaller compared to other methods.
• Large stones were broken into fewer, discrete fragments, aiding extraction.
• Laser energy transmission through fine, flexible fibers was demonstrated.

Conclusions:

• Pulsed Nd:YAG laser lithotripsy is a highly effective method for urinary stone fragmentation.
• The technique produces small, manageable fragments, potentially improving stone clearance.
• Laser fiber technology enables promising applications for in-situ bladder and future percutaneous kidney stone treatment.