Dragerwerk Aktiengesellschaft

Hans-Joachim Hartwig

Erik Schwanbom

Detlef Warnow

A synchronized intermittent mandatory ventilation respirator for providing inhalation and exhalation cycles to a patient while permitting the patient to carry out a complete inhalation and exhalation cycle spontaneously, comprising a gas supply adapted to be connected to a patient for supplying breathing gas under pressure to the patient, a main line connected to the gas supplied for supplying breathing gas to the patient, a main valve in the main line, and a timing system connected to the gas supply and the main valve for opening the main valve for a first selected timed inhalation cycle to supply breathing air to the patient and closing the valve for a selected timed exhalation cycle to permit the patient to exhale. A timer is connected to the main line downstream of the main valve, to the gas supply and to the timing system for blocking the connection between the timing system and the gas supply for stopping cycling of the timing system in response to a spontaneous inhalation of the patient and for supplying breathing air to the patient for a second selected timed inhalation cycle, and a trigger is connected to the main line downstream of the main valve and to the timing system for switching the timing system from an exhalation cycle to an inhalation cycle in response to a spontaneous inhalation of the patient.

Respirator

A monitoring device for monitoring the breathing air pressure in a breathing gas passage between a patient and a respirator comprises a pressure gauge connected into the passage which has a pivotal indicator pointer which is movable in response to pressure changes in a direction corresponding to the pressure change, that is, whether it is raised or lowered. An air gate overlies the path of movement of the pointer at both a maximum allowable pressure and at a minimal allowable pressure for the breathing passage. Each of the gates include an air discharge which is interruptable by the pointer when the pressure in the breathing passage reaches the respective maximum or minimum value. In addition, an electronic signal circuit is connected to each gate which includes a logic for actuating a selected signal. The logic circuit for overpressure produced behind the air gauge with a maximum pressure or overpressure has a negation amplifier element, a drop signal and, in common with the logic circuit for the underpressure, a series-switched OR-element, identity element and tuning pipe. The pneumatic logic circuit for underpressure produced behind the minimal pressure air gate has a negation amplifier element, a throttle, a storage connected both ahead and behind the throttle in the circuit, an identity element and a drop signal ahead of the connection to the OR-element. An identity element may be replaced by two series-switched negation elements. The air gate for underpressure has a flow-through lock.

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Lubeck, Germany

Hans-Joachim Hartwig