Table of Contents - Covidien

Introduction
This manual tells you how to operate and perform simple
maintenance for the 700 Series Ventilator. Covidien recommends
that you become familiar with this manual and accompanying labels
before attempting to operate or maintain the ventilator. If you need
additional copies of this manual, contact your Covidien
representative.
To ensure optimum performance of the 700 Series Ventilator System,
Covidien recommends that a qualified service technician perform
periodic maintenance on the ventilator. For more information,
contact your Covidien representative.
1.1 Functional description
By pressing keys and turning the knob on the ventilator keyboard,
the operator gives initial instructions and data to the ventilator
(Figure 1-1). The user interface microcontroller processes this
information and stores it in the ventilator’s memory. The breath
delivery microcontroller uses this stored information to control and
monitor the flow of gas to and from the patient.
The 700 Series Ventilator uses a flow trigger to recognize patient
effort. The trigger monitors flow from the piston during exhalation.
When the patient inhales, patient circuit pressure drops very slightly
below end-expiratory pressure. At the same time, the piston moves
forward to deliver flow to the ventilator breathing circuit and
maintain the preset PEEP/CPAP level. The level of flow depends on
the patient’s effort. If this flow exceeds the user-set level, the
ventilator triggers. By design, the ventilator attempts to maintain
PEEP in the presence of a circuit leak. Since a leak drives the piston to
deliver flow to make up for pressure losses, a circuit leak can require
an increase in the flow trigger level to avoid autocycling.
During exhalation, the ventilator’s piston retracts and draws air and
oxygen into the cylinder. The ventilator uses room air, which means
the ventilator can operate without a compressor or wall air source.
Room air enters the ventilator through a protected user-replaceable
air intake filter just inside the ventilator cabinet. This filter captures
airborne particles.
700 Series Ventilator Operator’s Manual 10066984 Rev. D 1�3