J Med Assoc Thai 2002; 85 (7):772

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Filtration Efficiency of the Ramathibodi Nasal Filter Evaluated by Rhinomanometry in High Concentration Level of Laser Smoke Particle
Tanpowpong K Mail, Chiratthiti C

Under conditions with a high concentration level of laser smoke particles, the filtration
efficiency of the Ramathibodi nasal filter was studied. Different kinds of filter material in the Rama-
thibodi nasal filter were evaluated in human adults with an anterior standard rhinomanometric method.
The Ramathibodi nasal filter with three-layers of a half-face mask filter and a 4 mm thickness poly-
urethane foam put inside was applied in a simulated human airway. The experiment was conducted
in the Otolaryngology Department, Ramathibodi Hospital from October to December 2001. The
amount and size of laser smoke particles were measured by a laser diode portable dust monitor. The
amount of residual laser smoke particles in the simulated human airway without the Ramathibodi
nasal filter of PM2.5, PMlO and PM15 were 100.91
เธ‘
7.65, 109.10
เธ‘
7.87 and 120.18
เธ‘
14.28 mcg/m3
respectively. The amount of residual laser smoke particles in the simulated human airway with the
Ramathibodi nasal filter of PM2.5, PMlO and PM15 were 85.55
เธ‘
3.42, 92.18
เธ‘
4.40 and 99.72
เธ‘
5.02 mcg/m
3
respectively. The filtration efficacy of the Ramathibodi nasal filter showed a high statis-
tically significant difference with a p-value of

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