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ICLASS-2006 Aug.27-Sept.1, 2006, Kyoto, Japan
 

Summary: ICLASS-2006
Aug.27-Sept.1, 2006, Kyoto, Japan
1. INTRODUCTION
Laser dermatological surgery (LDS) is the treatment of
choice for vascular lesions (e.g., hemangiomas [1] and Port
Wine Stain (PWS) [2] birthmarks) as well as aesthetic
purpose (e.g., hair [3] and tattoo [4] removal). For these
conditions, cryogen spray cooling (CSC) is an essential
auxiliary method that protects the epidermis from excessive
thermal damage during laser irradiation, while the target,
such as PWS blood vessels located 100500 m below the
skin surface [5] are thermally photocoagulated. The only
cryogen used for this purpose thus far, approved by the
FDA [3], is Tetrafluoroethane-1,1,1,2 (R134a), with a
boiling temperature of -26 o
C at atmospheric pressure.
Short cryogen spurts (20100 ms) [6, 7] are released from a
pressurized container through a spray valve/nozzle system.
Well-atomized cryogen droplets with diameters of 320 m
[8] and velocities 1060 m/s [9] impact onto human skin

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering