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Operation: Advanced
32
User Override
The user has the option of overriding the machine's "Safe Range
™
" limits to allow for
more advanced respiratory control. The Safe Range™ is defined as ±10% of the
machine's recommended tidal volume and ±10% of the machine's recommended respi-
ration rate. When you would like to change a respiration parameter simply enter the
value according to the steps provided in the Getting Started section. If the value is out-
side of the Safe Range
™
,Inspira will ask you if you would like to override the current Safe
Range
™
parameter. On this prompt screen press [1] to select "Yes" or [2] for "No".
Note: Some parameters may not be valid due to current respiration profile, cylinder
size, and electromechanical limitations.
WARNING: Overriding Safe Range™ may be harmful to the patient.
Key
Display
Using Digital and Analog I/O Ports
Trigger In
This is an active low, digital signal, used to trigger the ventilator between the RUN and
STOP modes. Each pulse given to Inspira through this channel will toggle the machine
to the next state. This optional signal is input by the user through the use of a
footswitch or other device connected to the front panel BNC connector. Minimum
input pulse width = 1 ms.
Sync Out (Inspira ASV v (version 1.13 and earlier))
This is an active-low, open-collector, digital signal generated at the start of each inspi-
ration stroke. This signal is available at the front panel through a BNC connector. The
pulse width equals 20 ms ±10 ms. This signal can be used in conjunction with other
devices, which need to operate in sync with the ventilator's respiration stroke. The
falling edge must be used for sync timing.
Sync Out (Inspira ASV p & ASVv (version 1.14 and later))
The sync signal is a logic high for the duration of the inspiration time and a logic low
during the expiration time. The rising edge corresponds to the start of the inspiration
cycle and the falling edge corresponds to the start of expiration.
Analog Out
The analog out (ANALOG OUT 1) is used to measure the ventilator's airway pressure.
This output can be monitored using a data acquisition system or by an oscilloscope.
To view or record this signal, connect the data acquisition system or oscilloscope to
the analog out BNC connector on Inspira's front panel.
Publication 5404-001-REV-C
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