2 Theory of Operation
M1207026 2-13
Mechanical inspiration
(EZchange ON)
The Bag/Vent switch closes the manual path. Pilot pressure closes
the exhalation valve.
Drive gas pushes down on the bellows. Gas flows from the bellows,
through the absorber, the EZchange, and through a unidirectional
valve (inspiratory check valve) to the patient.
During inspiration, common gas flow into the inspiratory limb,
upstream of the inspiratory check valve.
Mechanical expiration
(EZchange ON)
Drive gas flow stops and the exhalation valve opens. Exhaled gas
flows from the patient, through a unidirectional valve (expiratory
check valve) and into the bellows. Residual drive gas flows out of the
bellows to the scavenging system.
If PEEP is selected, static pressure on the pilot of the exhalation
valve sets the PEEP level.
During exhalation, common gas flow backwards through the
EZchange and absorber into the expiratory limb, downstream of the
expiratory check valve.
Mechanical inspiration
(EZchange OFF)
The Bag/Vent switch closes the manual path. Pilot pressure closes
the exhalation valve.
Drive gas pushed down on the bellows. Gas flows from the bellows,
through the EZchange module bypassing the absorber, and through a
unidirectional valve (inspiratory check valve) to the patient.
During inspiration, common gas flows into the inspiratory limb,
upstream of the inspiratory check valve.
Mechanical expiration
(EZchange OFF)
Drive gas flow stops and the exhalation valve opens. Exhaled gas
flows from the patient, through a unidirectional valve (expiratory
check valve) and into the bellows. Residual drive gas flows out of the
bellows to the scavenging system.
If PEEP is selected, static pressure on the pilot port of the exhalation
valve sets the PEEP level.
During exhalation, common gas flows backwards through the
EZchange module bypassing the absorber and into the expiratory
limb, downstream of the expiratory check valve.
Pop-off Valve The pop-off valve limits the pressure inside the bellows to 2.5 cm H
2
O
above the drive gas pressure. This normally occurs when the bellows
reaches the top of the housing at the end of the exhalation.
Excess gas vents to the scavenging system through the pop-off valve
and the exhalation valve.
M1207027 004 MANUAL−DOC, Technical Reference Manual, Technical Reference Manual for 9100c, English−default
Reproduced from the electronic master in MATRIX
To Next Page
Loading...
