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Original ArticleOpen Access
Nasal Model and Lung Model Machine for Intranasal Stent with Filters Efficacy Evaluation
Tanpowpong K 
Nasal model and lung model machine simulated human respiratory situation with cycli-
cal air flow rate of 2 1/min. They were used to evaluate filtration efficacy of filters in an intra-
nasal stent for laser smoke particles in the Otolaryngology Department, Ramathibodi Hospital
from February to June 1998. The filters were three layers of half face mask outer filters. Each
of five sets or 10 intranasal stents with filters or Whatman filters was attached at both inlet ends
of the nasal model. A Whatman filter collected the maximum particle amount from
I 0
shots,
I 0
W and 0.2 s of single pulse mode carbon dioxide laser evaporative field for 5 min which was
the same amount passed through filters of the intranasal stent. A high power optical microscope
was used to count particle retention in each filter. The mean filtration efficacy of filters in the
intranasal stent was 94.4 per cent when compared with that of the Whatman filter. A personal
respiratory protective device could be applied in the human nasal vestibule to prevent poly-
disperse suspended particulate matter in a highly air-polluted area. The nasal model with lung
model machine should be tested under different concentrations of laser smoke particles or at
the main roadside.
Key words : Nasal Model, Lung Model Machine, Intranasal, Stent, Filter, Efficacy, Laser Smoke
Particle
cal air flow rate of 2 1/min. They were used to evaluate filtration efficacy of filters in an intra-
nasal stent for laser smoke particles in the Otolaryngology Department, Ramathibodi Hospital
from February to June 1998. The filters were three layers of half face mask outer filters. Each
of five sets or 10 intranasal stents with filters or Whatman filters was attached at both inlet ends
of the nasal model. A Whatman filter collected the maximum particle amount from
I 0
shots,
I 0
W and 0.2 s of single pulse mode carbon dioxide laser evaporative field for 5 min which was
the same amount passed through filters of the intranasal stent. A high power optical microscope
was used to count particle retention in each filter. The mean filtration efficacy of filters in the
intranasal stent was 94.4 per cent when compared with that of the Whatman filter. A personal
respiratory protective device could be applied in the human nasal vestibule to prevent poly-
disperse suspended particulate matter in a highly air-polluted area. The nasal model with lung
model machine should be tested under different concentrations of laser smoke particles or at
the main roadside.
Key words : Nasal Model, Lung Model Machine, Intranasal, Stent, Filter, Efficacy, Laser Smoke
Particle
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