Mindray A7 Operating Instructions

A7™ Operating Instructions 046-004667-00 4 - 25
Preoperative Tests Breathing System Tests
4.14 Breathing System Tests
WARNING: Objects in the breathing system can stop gas flow to the patient. This
can cause injury or death. Ensure that there are no test plugs or other
objects in the breathing system.
WARNING: Do not use a test plug that is small enough to fall into the breathing
system.
1. Ensure that the breathing system is correctly connected and not damaged.
2. Ensure that the check valves in the breathing system work correctly:
a. The inspiratory check valve opens during inspiration and closes at the start of expiration.
b. The expiratory check valve opens during expiration and closes at the start of inspiration.
4.14.1 Bellows Test
1. Select the End Case button in the Manual tab.
2. Follow the screen prompts to end the case and enter Standby mode.
3. Set the Auto/Manual ventilation switch to Auto.
4. Set all flow to zero.
5. Close the breathing system at the patient connection by connecting the Y-piece on the
breathing circuit to the leak test port.
6. Push the O
2
flush button to expand the bellows to the top of the bellows enclosure.
7. Ensure that the pressure does not increase to more than 15 cmH
2
O on the airway pressure
gauge.
8. The bellows should not fall faster than a rate of approximately 300 ml/min. If the leak rate is
greater, troubleshoot the source of the leak. If the source of the leak is the bellows, then
replace the bellows.
4.14.2 Breathing System Leak Test in Manual Ventilation Status
1. Set the Auto/Manual ventilation switch to Manual.
2. Adjust all flowmeters to zero.
3. Select the End Case button in the Manual tab.
4. Follow the screen prompts to end the case and enter Standby mode.
5. Connect the manual bag to the manual bag port.
6. Adjust the APL to 50 cmH
2
O position.
7. Connect the Y-piece on the breathing circuit to the leak test port.
8. Push the O
2
flush button until the airway pressure gauge value is between 25 and 35
cmH
2
O.
9. Release the O
2
flush button. A pressure decrease on the airway pressure gauge indicates a
leak. Contact your service personnel.

Mindray A7 Specifications

General

Brand	Mindray
Model	A7
Category	Medical Equipment
Language	English