Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 11, 2022 - September 14, 2022
The authors have been developing a generator for NCPAP (hereinafter abbreviated as HNCPAP) using an air-curtain. This paper is reported that HNCPAP has characteristics as a fluidic device. The experiment was performed using the healthy breathing mode of the spontaneous breathing simulator for newborns (PT-2: manufactured by Atom Medical) equipped with HNCPAP, and the MAP was changed with constant tidal volume. The experimental conditions were that the respiratory rate and the tidal volume TV were constant at 50 times/minute and 7ml, respectively, and the experiment was performed by changing every 100 Pa within the MAP range (300 Pa to 900 Pa). The result obtained was that the prong flow developed into a forced vortex in the inhalation, and the inhalation flow was stable regardless of the increase in MAP. In the first half of exhalation, the sub-vortex developed into a forced vortex and sub-flow was stably discharged, so that the entrainment was stable regardless of the increase in MAP. By alternately repeating these inhalation and first-half exhalation flows, the characteristics as a fluidic device were clarified. Further NDPAP results revealed that abdominal distension was caused by the inhalation flow more than tidal volume due to Bernoulli’s effect.
