Portable device for the survey of the breathing ventilation and of the oxygen consumption, connected by means of radio signals to a fixed reception and elaboration station

Claim 1

A portable device for surveying breathing ventilation and oxygen consumption, said device communicating by radio signals to a fixed reception and elaboration station, said device comprising a volume meter, an oxygen concentration meter, control and radio transmission means including a modulator connected to a radio transmitter, said radio transmission means being of small dimension and light weight so as to be carried by the person to be examined, said device comprising a gaseous volume survey system connected to a mask and including a turbine rotatable at a speed proportional to the speed of a volume of air striking the turbine, a photodiode system and a photosurveyor for generating pulses indicating the speed of rotation of the turbine, a pressure transducer for surveying air flow annulment, said transducer detecting the presence or absence of air flow through the turbine and providing an output signal on the cessation of air flow to prevent said photodiode system and photosurveyor from transmitting said pulses to a Schmitt trigger connected to said modulator and said radio transmitter, said Schmitt trigger being responsive to said pulses from said photodiode system and said photosurveyor to simultaneously provide an output signal to said modulator and said radio transmitter and to a power amplifier connected to said Schmitt trigger, said device further comprising an integrator for controlling the amplification factor of said power amplifier, a sampling pump, a micro-mixing chamber communicating with said pump, the gas flow through said pump being proportional to the expiratory flow and the capacity thereof being controlled by said power amplifier, and a polarographic electrode for measuring oxygen percentage, said electrode being connected to said modulator and said transmitter and providing an output signal thereto.