GE 9100c - Mechanical Overpressure Valve; Free Breathing Valve; Breathing Circuit Flow Sensor

2 Theory of Operation
M1207026 2-27
Figure 2-10 • Bellows pressure relief valve
2.8.7 Mechanical
Overpressure Valve
The Mechanical Overpressure Valve (MOPV) is a mechanical valve
(4) that operates regardless of electrical power. It functions as a third
level of redundancy to the ventilator's pressure limit control functions,
supplying pressure relief at approximately 110 cm H
2
O.
2.8.8 Free Breathing
Valve
The free breathing valve (5) helps assure the patient can
spontaneously breathe. The ventilator is programmed to supply a
specified number of breaths per minute to the patient. If, in between
one of these programmed cycles, the patient initiates a breath
(spontaneous), the free breathing valve permits the patient to inhale.
The free breathing valve is closed on mechanical inspiration.
2.8.9 Breathing
Circuit Flow Sensor
The flow sensor (14) is installed at the patient’s Y-piece connector
(15). The flow sensor measures the expired V
T
. When gas flows
through the flow sensor, a pressure difference is generated between
the two sides of the sensor diaphragm. The pressure difference is
measured and interpreted on the control sample board in order to
calculated the V
T
value. The sensing tubes must be connected
correctly to the ports at the side panel of the machine for accurate
readings. The tube closest to the patient connection (13) must be
connected to the port labeled “ǻP+”.
12
13
15
14
Large
Port
Small
Port
M1207027 004 MANUAL−DOC, Technical Reference Manual, Technical Reference Manual for 9100c, English−default
Reproduced from the electronic master in MATRIX