TA80V User Manual
9.8. Technical Specification for the Anesthesia Ventilator
9.8.1. Working Principle of Anesthesia Ventilator
The simplified block diagram of the anesthesia ventilator is shown in Figure 9 2. In this figure, the
blocks connected by pipelines are the air path part of the host, and the blocks connected by arrows
are the electronic control part of the host.
After the air source enters, the pressure is monitored by a pressure sensor, and the flow control valve
and expiration control valve are controlled by adjusting the tidal volume setting value, respiratory
frequency, inhalation-to-exhalation ratio or breath-holding time. For safety reasons, a safety valve is
designed in the airway. The safety valve is used to limit the maximum pressure of the animal's airway.
It is generally set to 6kPa. When the airway pressure exceeds the safety pressure of the airway
system, the safety valve opens and deflates. The airflow drives the bellows circuit, causing the
anesthesia circuit gas to enter the animal's body through the flow sampling probe, and is converted
into a monitoring signal for the system, which can monitor the inspiratory tidal volume and be used to
adjust the ventilator output airflow value. Then during the expiratory phase, the animal's exhaled gas
re-enters the anesthesia circuit through the flow sensor, and through the signal fed back by the flow
sensor, the system can calculate the expiratory tidal volume and minute expiratory volume. This
control process is controlled by the flow control valve and the exhalation control valve.
When inhaling, the flow control valve opens and the exhalation control valve closes. When exhaling, it
is just the opposite, that is, the flow control valve closes and the exhalation control valve opens
according to the set PEEP part. The entire process is controlled by an electronic control system. In
the electrical schematic diagram 9.2, the main control unit provides various rhythms of the entire
machine, including inhalation time, control signal and opening size of the flow control valve, control
signal of the exhalation control valve, and collection and processing of sensor signals.
Keyboard coding and communications, power control. The amplification and drive unit provides
sensor interfaces, preamplification, and driving of actuators such as flow control valves and
exhalation control valves. The panel part mainly completes parameter settings. The power supply
part mainly provides the power required for the normal operation of each part of the entire system.
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