Cryogen Epid-Cooling System VS 冷風機
冷卻皮膚嘅目的係減低激光燒傷皮膚嘅機會，並且減低痛楚。而就冷凍皮膚效能，冷風機同冷凍劑嘅分別係點架呢？
下面係冷風機同冷凍劑嘅對比：
冷風機：靠冷空氣降溫，噴射降溫，單用冷風機有時並唔夠降溫架，所要會用埋冷凍GEL，敷冰，過程長而冷，更因為係脫毛前大大冷減低皮敷表面溫度，降低激光效能，脫毛減果較為弱。
冷凍劑：GentleLASE係採用-20度cryogen冷凍劑冷卻皮膚，成分係HFC-134a（中文名四氟乙烷），喺激光發射後0.003秒噴射，對皮膚感覺而言，差不多是同部，所以感覺清爽，且快。
Cryogen Cooling System技術可令更高激光能量治療過程中被傳遞，大大減低灼傷、疼痛，省卻麻醉藥帶來的不適及不便。
電腦程式用智能系統，控制-20度冷凍劑Cryogen停留皮表層時間，預防灼傷同時，絶不會凍傷皮膚。
現時配有內置PRO-LE™ EPID-COOLING SYSTEM的只有CANDELA研發的當中數款激光脫毛儀器，包括PRO-LE™ 755nm LASER TECHNOLOGY.
“The PRO-LE™ EPID-COOLING SYSTEM is not in skin contact with the skin surface. Rather, liquid drops of cryogen are sprayed onto the skin surface. The cryogen used is a non-flammable, environmentally compatible freon substitute. The cryogen forms a liquid pool on the skin surface. The temperature of the pool is between minus 30 - minus 60 degrees centigrade. That is obviously far below the "frostbite" temperature mentioned above. The cryogen subsequently evaporates and removes heat from the skin. Because the spurt durations are so short, the cooling remains confined to the epidermis and does not affect the temperature of the underlying port wine stain blood vessels. This spatial selectivity of the cooling is what allows much higher laser light dosages to be used while at the same time minimizing injury to the skin. ”
-J. Stuart Nelson, M.D., Ph.D., Professor of Surgery, of the Beckman Laser Institute and Medical Clinic. Inventor of the PRO-LE™ EPID-COOLING SYSTEM used on Candela’s lasers.
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