November 2000
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Page 4-1
Page 4-1
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4 Theory of Operation
4 Theory of Operation
4 Theory of Operation
4 Theory of Operation
This section provides an overview of the functions of the ventilator to a
level necessary to supplement the intended level of maintenance. A set
of schematic diagrams is located at the end of this section.
General Description
General Description
General Description
General Description
The ventilator is a compact, microprocessor-controlled volume ventila-
tor delivering tidal volumes from 100 to 2200 ml, inspiratory times
ranging from 0.5 to 5.5 seconds, and breathing rates from 1 to 38 BPM.
The system functions in Assist/Control, SIMV, or Pressure Cycle
modes. It permits PEEP ventilation with a PEEP-compensated assist
sensitivity control. A pressure Limit control (LP10 and LP20) is provided
primarily for use with patients with uncuffed tracheostomy tubes.
The ventilator uses an electronically controlled piston pump that oper-
ates independently from a high pressure gas source or compressor.
Intended for 110 VAC or 220 VAC primary power, the ventilator also
operates for extended periods from 12 VDC power without compromis-
ing operational specifications. An internal DC source provides emer-
gency power for up to one hour (when properly charged) should all
external power sources fail.
A brushless motor increases reliability by eliminating components such
as brushes, belts, and armatures. It also decreases periodic mainte-
nance, plus provides a more controllable system.
Volume is adjusted by a computer chip that controls the length of the
return stroke.
An integral molded manifold eliminates the need for extensive internal
tubing, and greatly improves the parallel IMV breathing path. A 62
micron gross particulate filter enhances air filtration. All inlet passages
and check valves are sized to minimize airflow resistance.
An elapsed time clock monitors operating hours. The clock is tied to
existing controls and to the
PATIENT PRESSURE
PATIENT PRESSURE
PATIENT PRESSURE
PATIENT PRESSURE
gauge to provide a rapid and
accurate time check without disassembly. The ventilator can provide
operating parameters and waveforms to an optional printer.