Dragerwerk Aktiengesellschaft

Klaus Freytag

Detlef Warnow

The respirator includes a breathing gas supply line connected, through a distribution piece, to a mouthpiece, and also connected to a breathing gas discharge line having interposed therein a control valve controlling discharge of expirated breathing gas, the control valve being switched between opened and closed positions with the aid of a pressure-sensitive control means. An actual value pointer is connected to and operable by the pressure-sensitive control means, and two air barriers are positioned in the range of movement of the pointer for interruption by the pointer. One air barrier constitutes a frequency air barrier which closes the control valve by a pressure signal responsive to interruption of the frequency air barrier by the pointer. The other air barrier constitutes an inspiration-time air barrier which effects opening of the control valve by a pressure signal responsive to interruption of the inspiration-time air barrier by the pointer. The two air barriers are displaceable in the range of movement of the actual-value pointer to provide for simple adjustment of the respiration frequency, the inspiration and expiration time, and the ratio of the inspiration time to the expiration time. The control components are pneumo-logical components, and the frequency air barrier is connected to a charging accumulator controlled by a choke and a capacitance, the charging accumulator being also connected to the pressure-sensitive control means.

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Bad Schwartau, Germany

Klaus Freytag