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Original ArticleOpen Access
Efficacy of Intranasal Stent with Filters for Different Laser Smoke Particle Concentration
Tanpowpong K 
Intranasal, hollow, cylindrical, medical grade, silicone stent with two layers and one layer
of half face mask outer filter at each end was tested with different concentrations of laser smoke
particles. A single pulse mode of carbon dioxide laser smoke particle created suitable poly-
disperse atmospheric suspended particulate matter amount. The personal respiratory protective
device efficacy was done at the Otolaryngology Department, Ramathibodi Hospital from July to
September 1998. The Whatman filter had the same laser smoke particle amount that passed through
each filter of the intranasal stent. The cyclical air flow rate of 2 Vmin in the nasal model was
controlled by a lung model machine and respirometer. The particle deposition in filter materials
was counted under a high power optical microscope. The filtration efficacy of an intranasal stent
with filters for 5, 10 and 20 shots of laser smoke particle were 90.5, 94.6 and 95.6 per cent res-
pectively with a mean of 93.6 per cent. The device application in a human nasal vestibule
depended on acceptable nasal air flow resistant in various highly air-polluted areas.
Key word
: Intranasal, Stent, Filter, Efficacy, Laser Smoke Particle, Nasal Model, Lung Model
Machine
of half face mask outer filter at each end was tested with different concentrations of laser smoke
particles. A single pulse mode of carbon dioxide laser smoke particle created suitable poly-
disperse atmospheric suspended particulate matter amount. The personal respiratory protective
device efficacy was done at the Otolaryngology Department, Ramathibodi Hospital from July to
September 1998. The Whatman filter had the same laser smoke particle amount that passed through
each filter of the intranasal stent. The cyclical air flow rate of 2 Vmin in the nasal model was
controlled by a lung model machine and respirometer. The particle deposition in filter materials
was counted under a high power optical microscope. The filtration efficacy of an intranasal stent
with filters for 5, 10 and 20 shots of laser smoke particle were 90.5, 94.6 and 95.6 per cent res-
pectively with a mean of 93.6 per cent. The device application in a human nasal vestibule
depended on acceptable nasal air flow resistant in various highly air-polluted areas.
Key word
: Intranasal, Stent, Filter, Efficacy, Laser Smoke Particle, Nasal Model, Lung Model
Machine
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