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A7™ Operating Instructions 046-004667-00 5 - 9

Operations Ventilation Modes

Setting the APL Valve for Manual Ventilation

Rotate the APL valve adjustment knob to the desired pressure. The number on the rotating

portion that lines up with the index mark on the bottom section of the valve indicates the

approximate pressure setting.

NOTE: Clockwise rotation increases the pressure, and counterclockwise

rotation decreases the pressure.

The patient can be ventilated by hand using the breathing bag. The pressure will be limited to

the value set on the APL valve.

Setting the APL Valve for Spontaneous Breathing

Rotate the APL valve adjustment knob fully counterclockwise until the SP marking on the knob

lines up with the index mark on the bottom section of the valve. The valve will then be open for

spontaneous patient breathing.

NOTE: In the manual ventilation mode, you can use the APL valve to adjust the

breathing system pressure limit and gas volume in the manual bag.

When the pressure in the breathing system reaches the pressure limit

set for the APL valve, the valve opens to release excess gas.

NOTE: The APL valve adjusts the breathing system pressure limit during

manual ventilation. Its scale shows approximate pressure.

Cardiac Bypass Mode

Cardiac Bypass mode is only available in Manual ventilation mode. This mode turns off pressure

volume and apnea alarms when they are not appropriate (e.g., during heart/lung bypass).

NOTE: When Bypass mode is On, the Alarms button is disabled and set to Off.

A confirmation dialogue displays when turning Bypass mode On or Off.

Enter Cardiac Bypass mode by setting the Bypass softkey in Manual mode to On. When the

Bypass softkey is set to On, the Alarm softkey is disabled and set to Off automatically. When

Bypass is set to Off, the Alarm button returns to its setting before entering Bypass. When

exiting Manual mode or discharging a patient, Bypass will be set to Off.

FIGURE 5-8 Bypass Mode Softkey

Setting Alarms

In Manual ventilation mode, when Bypass and Monitor are set to Off, the pressure, volume and

apnea alarms can be turned off by setting the Alarms softkey to Off. The related alarm limits are

then displayed as Off.

Pressure, volume and apnea alarms can be turned on by setting the Alarms softkey to On, which

returns the related alarm limits to their original settings.

Mindray A7 Operating Instructions

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