Siemens Aktiengesellschaft

Maquet Critical Care Ab

Bo Dahlström

Sven G Olsson

Lars Danielsen

Carl Magnus Tornesel

A ventilatory valve controls a pressure level in a patient breathing circuit of an anesthetic breathing apparatus. The ventilatory valve has a valve unit having a controllable restriction to control the pressure level in an expiratory branch of the breathing circuit of the anesthetic breathing apparatus, an electrical operating unit for the valve unit, configured to electrically control the restriction during electrical operation of the anesthetic breathing apparatus, and a non-electrical operating unit () for the valve unit, configured to non-electrically control the restriction upon electrical defective or powerless operation of the anesthetic breathing apparatus.

Expiratory valve of an anesthetic breathing apparatus having safety backup

In an exemplary embodiment, a recording head and recording carrier are movable relative to one another for the purpose of recording several measurement signals on the recording carrier. It is the object of the disclosure to produce such a recording device which, with the lowest possible technical outlay, offers an optimum variation possiblity in the recording of a plurality of individual signals. This object is achieved in accordance with the disclosure by virtue of the fact that there is allocated, to an individual recording head as the recording element on the recording carrier, a variable number; e.g., between one and sixteen, of recording channels for measurement signals, into which recording channels the recording head can be driven by motor drive in chronological succession for the purpose of recording the signals in time-division multiplex operation, whereby the width of a respectively preselected channel or subchannel is prescribed by a width selector which determines the widths corresponding to a width program to be adjusted on the latter in advance, and to which a width/voltage converter is connected which, corresponding to the width of the channel generates a more or less rapidly rising ramp voltage (U.sub.R), which, together with the signal values obtained in the time-division multiplex operation, is supplied to a comparator for the comparison and output of a recording signal to the recording head for the purpose of recording a signal point in the case of equality of the voltage values.

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Vällingby, Sweden

Bo Dahlström