BIO-MED DEVICES IC-2A Service Manual page 23

Continuous Positive Airway Pressure (CPAP) Check
a. Connect a test lung to the patient circuit output and set the control as follows:
1. FLOW RATE to 30 LPM
2. PEEP/CPAP fully clockwise
3. MAX PRESSURE fully counterclockwise
4. INSPIRATORY EFFORT anywhere except so as to cause auto-cycling
5. CYCLE/MANUAL CPAP to MANUAL CPAP
6. OFF/ON switch to ON
The Ventilator should cycle and the Pressure Gauge should fluctuate no more
than 1 cmH O (caused by the exhalation valve).
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b. Rotate the PEEP/CPAP control fully counterclockwise. The Pressure Gauge
should read a maximum of 25 ±5 cmH
may increase by 5 cmH
not fall into range, the PEEP/CPAP circuit must be calibrated (paragraph 5.6).
c. Set the NORMAL/SIMV switch to SIMV. The Ventilator should stop cycling
except for backup breaths. The CPAP pressure should remain a constant 25
±5 cmH O. If the pressure decreases, check for leaks in the patient circuit or
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test lung. If no leak is present, check the pilot valve (Figure 6-1, item 32), or
the connections between the pilot valve and the patient manifold (item 51),
including the two-way relief valve (item 22) for leaks.
d. Set controls as in paragraph a. Turn PEEP valve fully counter-clockwise.
Circuit pressure will be 25 ±5 cmH
clockwise while observing circuit pressure during expiratory. When circuit
expiratory pressure begins to decrease, continue to close valve slowly until
the gauge settles to zero during expiratory (test lung fully deflates). Turn the
knob an additional ¼ turn clockwise. If the knob does not bottom out with
reference line at 6 o'clock position, loosen both set screws. Rotate knob so
that reference line is at 5 o'clock position, push knob firmly onto valve shaft
and tighten set screws.
CAUTION: Valve seat damage is possible if above is not adhered to.
Synchronous Intermittent Mandatory Ventilation Check
a. Connect a patient circuit and set the controls as follows:
1. FLOW RATE to 30 LPM
2. PEEP/CPAP fully clockwise
3. MAX PRESSURE fully counterclockwise
4. INSPIRATORY EFFORT anywhere except so as to cause auto-cycling
5. CYCLE/MANUAL CPAP to CYCLE
6. OFF/ON switch to ON
7. NORMAL/SIMV to SIMV
O during the expiratory period and
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O during the inspiratory period. If the pressure does
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O during expiratory. Turn the PEEP valve
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