Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-31
Figure 2-18. Exhalation system components (2 of 2)
2.2.5.2 Operational description
During exhalation, patient gas enters the exhalation system through the expiratory filter. The
pressure of the exhaled gas causes the check valve to open. The gas then flows toward the
opened exhalation valve. (The valve was opened by the exhalation solenoid, sufficiently to
maintain the operator-selected PEEP.) The exhaled gas flows through the opened valve and is
vented through the ventilator outlet.
Heaters heat the exhalation assembly walls to minimize moisture in the assembly, while
thermistors provide the ventilator with temperature feedback. The exhalation flow sensor
and pressure transducer provide readings used in breath delivery calculations.
Exhalation thermistor assembly
7-00107
7-00106
Exhalation valve assembly
7-00108
Exhalation flow sensor
with tube assembly
Summary of Contents for Puritan Bennett 700 Series
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