Appendix C: Operating Theory
205
OPERATING THEORY
THEORY
The iVent
TM
201 is a positive pressure mechanical ventilator. This appendix
describes the ventilator’s components and depicts a schematic flow of the
electro-pneumatic system. The function of each component is described below.
AMBIENT AIR FILTER
Air is drawn from the external environment through this filter. The filter captures
particles greater than 5 microns with an efficiency of 99.0%.
CBRN FILTER (OPTIONAL)
An optional configuration enables air to be drawn in through a Chemical,
Biological, Radiological, and Nuclear (CBRN) filter.
LOW PRESSURE O2 ADAPTER AND FILTER
(OPTIONAL)
An optional configuration that enables the usage of low pressure O2 sources,
such as concentrators, to provide O2 enrichment.
AIR/OXYGEN BLENDING SYSTEM
The blending system consists of an air entrainment port and a PSV (Proportional
Solenoid Valve) High Pressure O2 Enrichment Valve. The ventilator software
controls both the port and PSV account for variations in the inspired flow to
achieve the required oxygen concentration.
NOTE Units with serial numbers below 14999 have a different type of Oxygen
blender based on a demand valve and slider, drive by a stepper motor.
INLET MANIFOLD
The inlet manifold houses the air entrainment port, PSV or demand valve, and
fail-safe bypass port.
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