Covidien Newport e360, Service Manual

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A-1
A Theory of Operations
A.1
Device Description
The Newport™ e360 ventilator employs a dual PSOL gas delivery system (one each for air and
oxygen), a PSOL-controlled active exhalation valve, and a combination control panel interface and
touch screen interface/graphics monitor (GUI). The electronically controlled inlet gas mixing
system is superior to traditional pneumatic mixers that must exhaust gas from the system to
consistently deliver precise oxygen concentrations. The dual PSOLs respond immediately to
change the delivered FiO
2
when requested by the control system.
Approximately 60 minutes of operational backup power is available when the ventilator’s internal
battery is fully charged. In addition, the ventilator has remote alarm, external battery, VGA, and
external audio paused connections plus an RS232 interface to connect to central monitoring
systems and USB port for uploading software.
When the ventilator is turned on, the power on self-test (POST) verifies the integrity of the
software and hardware of the ventilator, and is in standby until the user selects
Start Ventilating .
During operation, the ventilator performs regular pressure transducer calibrations and software
tests to ensure accuracy of monitored and displayed data. A user-initiated circuit check performs
a leak test of the breathing circuit system, and measures circuit compliance and resistance. User-
initiated sensor calibration tests allow for calibration of the O
2
and exhalation flow sensors.
All breath types and modes include a range of ventilation and alarm settings appropriate for adult
or pediatric/infant patients. The ventilator has settable alarm limits for high and low peak airway
pressure, high and low expiratory minute ventilation/back-up ventilation, high respiratory rate,
disconnect threshold, and apnea. There are built-in alarms limits for O
2
monitoring, low baseline
pressure, high baseline pressure, sustained high baseline pressure, gas supply failure, device alert,
and power switchover.
The ventilator monitors and displays the power source, volumes, peak flows, breath timing
parameters (I:E ratio, respiratory rate, and inspiratory time), delivered oxygen concentration, and
patient pressures (peak, plateau, mean airway, and baseline).
The ventilator has a built-in oxygen analyzer that can be calibrated with a push of a button.
During exhalation, the ventilator uses a bias flow to flush exhaled CO
2
and stabilize temperature,
humidity, and baseline pressure in the patient breathing circuit. A stable baseline pressure
between breaths helps to minimize auto-triggering.