PRESSURIZED PROTECTIVE MASK WITH DEMAND-TYPE VENTILATOR HAVING OPTIMIZED ELECTRICAL POWER CONSUMPTION

摘要

A protective system has a mask (1) communicating with a motor-driven ventilator (4) via a tube (3). A pressure sensor (5) is operatively arranged to sense the pressure differential across the mask. Such sensed pressure differential is provided to a controller (8) which adjusts the amount of electrical energy supplied from a battery (7) to the ventilator. The response of the sensor and ventilator to changes in the wearer's breathing demand is less than one second.