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THERMAL INTERACTION OF CRYOGEN SPRAY WITH HUMAN SKIN UNDER VACUUM PRESSURES
 

Summary: THERMAL INTERACTION OF CRYOGEN SPRAY WITH HUMAN
SKIN UNDER VACUUM PRESSURES
Walfre Franco1
, Jorge Perez1
, Jie Liu1
, Guillermo Aguilar1
1
Department of Mechanical Engineering, University of California Riverside,
Riverside, CA, 92521, USA. gaguilar@engr.ucr.edu
Abstract. Clinical results of port wine stain (PWS) birthmarks laser therapy have
shown that dark purple lesions usually respond well to the first 35 treatments. However,
for most PWS, complete blanching is never achieved, and the lesion stabilizes at a red-pink
color. We have recently demonstrated that with the aid of a local vacuum applied to the
lesion site prior to laser irradiation, photocoagulation of the smaller vessels in PWS
birthmarks can be successfully achieved. We have then hypothesized that the release of
cryogen spurts under vacuum pressures may also offer many advantages to this
therapeutic procedure due to different spray-surface interactions under vacuum
conditions. The objective of our work is to study the thermal response of a skin phantom to
CSC at vacuum pressures. For this purpose, liquid cryogen was sprayed onto a skin
phantom under atmospheric and various vacuum pressures, ranging from -17 to -70 kPa,

  

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

 

Collections: Engineering