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Subsurface tissue lesions created using an Nd:YAG laser and cryogen cooling
Rahayu Ramli1, Daniel Durand, Nathaniel M Fried
1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland, USA.
Journal of Endourology
|January 28, 2004
Summary
This study explored deep laser heating with cryogen cooling to target subsurface tissues noninvasively. The technique successfully created deep lesions while protecting the surface, showing promise for urology applications.
Area of Science:
- Biomedical Engineering
- Urological Research
- Dermatological Laser Applications
Background:
- Surface cooling is standard in cosmetic laser procedures.
- Investigating deep laser heating with cryogen cooling for urology.
Purpose of the Study:
- To assess the potential of deep laser heating combined with cryogen cooling.
- To achieve noninvasive targeting of subsurface tissue structures in urology.
Main Methods:
- Utilized porcine liver and skin as tissue models.
- Employed gross and histologic methods to quantify lesion dimensions.
- Measured surface and lesion temperatures.
Main Results:
- Liver lesions: 4.9 mm diameter, 2.1 mm surface preservation. Skin lesions: 4.1 mm diameter, 1.2 mm surface preservation.
- Surface temperatures stayed below 40°C; lesion temperatures reached 60-70°C.
Conclusions:
- Deep laser heating with cryogen cooling shows potential for urological applications.
- The technique enables targeted subsurface lesion creation while preserving surface integrity.