Description Of Functional Subsystems; Inhalation System - Covidien Newport e360 Service Manual

Ventilator with accessories

Table of Contents

Theory of Operations

baseline pressure after a positive pressure breath, and 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 Overpressurization

A.5.1

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

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

With 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

pressure reaches 140 cmH

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 Rebreathing Exhaled Gases

A.5.2

In the case of a Sustained High Baseline Pressure alarm violation, Device Alert shutdown, Both Air/O

Supply Loss alarm violation or power off, gas delivery to the patient will cease. The inspiratory manifold

and exhalation valve systems are designed to protect the patient from rebreathing 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