decreased potential for auto-PEEP. A filter is used between the
expiratory limb of the breathing circuit and the expiratory (FROM
PATIENT) port to prevent contaminants in the exhaled gas from
entering the exhalation system.
Protection From Over Pressurization
In the case of a High Pressure alarm violation, Sustained High
Baseline Pressure alarm violation with suspension of ventilation,
Device Alert shutdown, Both Air/O
2
Supply Loss alarm shutdown
or Power Off, the exhalation valve opens to allow the patient to
exhale. The exhalation valve also opens any time breathing circuit
pressure reaches 135 cmH
2
O.
W
ith exception of the High Pressure alarm, these same conditions
cause the inspiratory emergency relief valve solenoid to be de-
energized which allows the circuit pressure to vent if it is above
the relief valve cracking pressure of 4 cmH
2
O. The relief valve
also opens any time breathing circuit pressure reaches 140
cmH
2
O.
A bacteria filter is placed between the inspiratory limb and the
inspiratory (TO PATIENT) port to prevent contaminants in the
exhaled gas from entering the inspiratory manifold when the
inspiratory emergency relief valve is de-energized.
Protection From Re-breathing Exhaled Gases In Case
of Ventilator Shutdown
In the case of a Sustained High Baseline Pressure Alarm violation,
Device
Alert shutdown, Both
Air/O
2
Supply Loss alarm violation or
Power Of
f, gas delivery to the patient will cease. The inspiratory
manifold and exhalation valve systems are designed to protect the
patient from re-breathing exhaled gas under this condition. A
mechanical emergency intake valve in the inspiratory manifold
allows the patient to breathe room air into the breathing circuit. The
exhalation valve acts as a one way valve allowing the patient to
exhale but not inhale. This system provides fresh gas through the
inspiratory limb and an easy route for exhalation through the
exhalation valve in the case of ventilator shutdown. If the exhalation
valve is blocked when the ventilator shuts down, the patient will
exhale through the inspiratory emergency relief valve when
pressure in the circuit reaches the cracking pressure of 4 cmH
2
O.
SER360 A1106 A-7
APPENDIX A
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