Laser effects on prostatic tissue: review of experimental data

Area of Science:

• Urology
• Biomedical Engineering
• Laser Physics

Background:

• Laser-tissue interaction is complex, influenced by laser, tissue, and procedural factors.
• Continuous-wave lasers in urology induce lesions through heating, denaturation, and charring.
• Lesions comprise a central cavity, char zone, and coagulation zone.

Purpose of the Study:

• To elucidate the fundamental phases and components of laser-induced tissue lesions in urology.
• To differentiate lesion configurations based on specific laser ablation methods.
• To provide a basis for rational selection of laser prostate ablation techniques.

Main Methods:

• Analysis of continuous-wave laser interactions with biological tissue.
• Characterization of lesion formation in three distinct phases: heating, denaturation, and evaporation.
• Categorization of lesion components: central cavity, char, and coagulation zones.

Main Results:

• Laser ablation produces lesions in three phases: initial heating, protein denaturation, and evaporation with charring.
• Lesions consistently exhibit a central cavity, a zone of char, and a coagulation zone.
• The spatial configuration of these lesion components varies with ablation method (noncontact, contact tip, free-beam).

Conclusions:

• Understanding the phases and components of laser-tissue interaction is crucial for effective urological procedures.
• Different laser ablation techniques result in distinct lesion morphologies.
• This knowledge empowers endourologists to make informed decisions when choosing laser prostate ablation methods.