Abstract: A backpressure-modulating cartridge for a breathing mask includes a body defining a first chamber which communicates with the environment, a second chamber which communicates with the mask, and a passage which communicates with the first and second chambers. A guide rod is supported by the body and is disposed in the passage. A movable exhalation valve is supported by the guide rod in the first chamber and has at least one transfer hole opposite the passage. A mechanism is provided for urging the movable exhalation valve into a passage-closing position. A movable inhalation valve is provided which has a surface area that is smaller than a cross-section of the passage. A mechanism is provided for opposing the mechanism for urging such that the movable inhalation valve is urged to close the at least one transfer hole of the movable exhalation valve.

Abstract: The invention relates to a portable module for recording the cardiac activity of a person with the aid of a device delivering an ECG signal. The device includes a main energy source connected to a second energy source supplying a temperature sensor by a controlled circuit, a unit that picks up and processes an ECG signal, having an ECG signal filter stage, connected to two integrators with different time constants. The integrator outputs are connected to a comparator delivering a signal (E.sub.3) representing cardiac cycles. The device also includes a mechanism for placing the ECG signal pickup and processing unit in operation and a processor.