| 摘要 |
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. |
