Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-63
Figure 2-52. Motor control and drive
2.6 Breath delivery
The 700 Series Ventilator System delivers mandatory (volume-controlled ventilation, VCV is
available on the 740 and 760 Ventilators, and pressure-controlled ventilation, PCV, is
available on the 760 Ventilator only) breaths and spontaneous (pressure support ventilation
or PSV) breaths. Mandatory breaths are delivered in the assist/control (A/C) and synchronous
intermittent mandatory ventilation (SIMV) modes. Spontaneous breaths are delivered in the
spontaneous (SPONT) and SIMV modes. This section describes how the ventilator delivers
mandatory and spontaneous breaths, from a hardware perspective.
Figure 2-53 is a plot showing ventilator parameters during the course of a mandatory VCV
breath. Figure 2-54 shows ventilator parameters during a PCV breath. Consult the
700 Series
Ventilator System Operator’s Manual
for a clinical perspective.
Before the ventilator can deliver breaths, it must initialize the piston to determine the
cylinder’s leak and piston’s position; this information is used for reference in breath delivery
calculations. This initialization is also described below.
For detailed information about the motor control/drive operation, see Section 2.5.
BBU PCB
Motor
controller
circuit
Motor
drive
circuit
Encoder
feedback
Motor/
encoder
Controller PCB
Piston/cylinder
Power
supply
Summary of Contents for Puritan Bennett 700 Series
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