呼吸応答型バイパスネーザルCPAP素子特性

抄録

In this report, I describe the relationship between CPAP pressure and Sub pressure and ventilation flow rate when changing tidal volume (2ml～8ml) of spontaneous breathing simulator(PT-2) while keeping MAP constant .As a result of the experiment, the following was found. ①As the amount of tidal volume increase, the minimum pressure value during inspiration has dropped from -20Pa to -150Pa above the set MAP. ②Based on the Sub pressure (-55Pa) in the stopped state of the diaphragm, the Sub pressure increases just before atmospheric pressure at the time of inspiration, and the ventilation flow rate pushes up the potential core at the time of exhalation, a part thereof flows out to the bypath flow path, and the Sub pressure decompresses to -200Pa during expiration.③The CPAP pressure is decompressed lower than the setting MAP by a completely different mechanism at the time inspiration and expiration.④From the above results, this device shall be a respiratory response type Nasal CPAP device. Since it was possible to observe respiratory state with small ventilation as change of CPAP pressure and Sub pressure, the possibility of this device as an interface applicable to super birth weight infants was shown.