Importance

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Abstract

A breath-synchronization control unit for a gas feeder, capable of reliably detecting inhalation and supplying a gas, which serves to control the gas feeder to supply a gas from a gas source in synchronization with the breath. Such a unit comprises a breath detector having a substrate on which a plate-like piezoelectric element is supported at one end or both ends thereof, in a container formed with an outside air vent at a position opposed to a surface of the piezoelectric element and a breath vent hole extending in the direction parallel to the surface of the piezoelectric element to detect a change in pressure of air introduced through the respective vent holes and generate an electric signal in response to the detection; a gas passage coupled to the breath vent hole formed on the container such that the inhalation and the expiration act thereupon wherein the gas is permitted to be supplied therethrough upon inhalation; an electromagnetic valve disposed on the gas passage and having a normally closed port coupled to the gas source; and a control section for actuating the electromagnetic valve to establish communication between the gas source and the gas passage for a predetermined period of time which, based on electric signals generated from the breath detector, simultaneously cuts off communication between the breath detector and the gas passage when inhalation is detected.

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First Claim