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March 30, 2020
Addendum – Procedures for Converting Drive Gas from Oxygen to Air
Dear Valued Customer:
This communication is an addendum to the document noted above and provided on March 23, 2020 regarding
the use of Mindray A-Series Anesthesia Delivery Systems for continuous ventilation. Specifically detailed is the
process for converting the systems drive gas from oxygen to air.
Note: Only individuals qualified to perform maintenance/repair on anesthesia systems should carry
out this conversion.
Systems having the drive gas modified should be prominently labeled as such and may not be
used for anesthesia delivery, until the drive gas is reverted to oxygen.
Guidance for converting the A7 system is provided under Attachment 1.
Guidance for converting the A5 system is provided under Attachment 2.
Guidance for converting the A3/A4 system is provided under Attachment 3.
The following are recommendations/considerations during use after a system's drive gas has been converted
from oxygen to air:
1. It is strongly recommended to connect both the air and oxygen source before using the system to achieve
a gas source pressure between 280-600 kPa (41-80 psi).
2. If the pressure of air is lower than 140 kPa ±10% (20 psi ±10%), the system will display the alarm "Drive
Gas Pressure Low" and will not ventilate.
3. If the pressure of the oxygen gas source is lower than 220 kPa ±10% (32 psi ±10%) the system will display
the alarm "O2 Supply Failure". Under this condition, the system will continue to ventilate but the oxygen
fresh gas delivered may be lower than expected.
4. If the flow sensor requires calibration after the drive gas has been converted, the tidal volume accuracy may
be up to 5% over specification.
Mindray's in-house supports team remain available 24/7. If assistance is needed, please contact Technical
Support at (800) 288-2121, option 2.
Sincerely,
Diane Arpino
Director, Quality Operations and Regulatory Affairs
Mindray DS USA, Inc.
US Agent for Shenzhen Mindray Biomedical Corp., Ltd.
d.arpino@mindray.com
Mindray North America
Mindray A-Series Anesthesia Delivery System
Consideration for use as a Ventilator
800 MacArthur Blvd.
Mahwah, NJ 07430 Tel: 201.995.8000
Page 1 of 19
www.mindray.com
0002-08-1659 Rev. A
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Summary of Contents for Mindray A Series
- Page 1 This communication is an addendum to the document noted above and provided on March 23, 2020 regarding the use of Mindray A-Series Anesthesia Delivery Systems for continuous ventilation. Specifically detailed is the process for converting the systems drive gas from oxygen to air.
- Page 2 Attachment 1 Please follow the steps below to convert the drive gas of Mindray A7 Anesthesia delivery systems from oxygen to air, the connection diagrams before and after the change are shown below: Connection diagram before change: Connection diagram after change: Mindray North America 800 MacArthur Blvd.
- Page 3 (If the AGSS assembly is connected to the machine, unplug the transfer tubes from AGSS assembly). Remove the rear cover panel: Unscrew the six screws on the lower rear panel assembly to remove it. Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 4 Remove the hose #36 (Orange) from the AIR cylinder yoke and the X-piece (connected to hoses #54, #37 and #125). Disconnect the hose #60 (Green) from the oxygen cylinder yoke. Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 5 Connect one end of the hose #36 (Orange) to the oxygen cylinder yoke, the other end to Y-piece (connected to hoses #69 and #38). Interchange the port of hose #61 (Green) and #63 (Green). Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 6 Rotate the AIR needle valve knob to ensure a continuous flow increase throughout its full range. g) Set the AIR flow to 2L/min. h) Fully rotate the O2 needle valve knob and verify that there is no increase of total flow. Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 7 14. Prominently label the unit that the drive gas has been modified and the system may be used. Please follow the steps below to convert the drive gas of Mindray A7 Anesthesia delivery systems from air to oxygen.
- Page 8 Attachment 2 Please follow the steps below to convert the drive gas of Mindray A5 Anesthesia delivery systems from oxygen to air. The connection diagrams before and after change are shown below: Connection diagram before change: Connection diagram after change: Mindray North America 800 MacArthur Blvd.
- Page 9 Remove the rear cover panel: Unscrew the six screws on the lower rear panel assembly to remove it. Remove the yoke panel: Unscrew the four screws on the upper rear panel (yoke cover) and pull it out. Mindray North America 800 MacArthur Blvd.
- Page 10 Disconnect the hose #61(Green) from the Y-piece (connected to hoses #60 and #38). Disconnect hose #69 (Green) from the Y-piece (connected to hoses #61 and #63). Connect hose #69 (Green) to the Y-piece (connected to hoses #60 and #38). Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 11 100 seconds (2 psi per 20 sec). h) Release the AIR line pressure hose. Reconnect the O2 and AIR line pressure hoses and remove the pinch in the hose. Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 12 13. Prominently label the unit that the drive gas has been modified and the system may be used. Please follow the steps below to convert the drive gas of Mindray A5 Anesthesia delivery systems from air to oxygen.
- Page 13 Perform the chapter 3.11 (Performance Verification) of the service manual The label that was added to the unit that the drive gas was been modified should be removed and the system may be used for anesthesia delivery. Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 14 Attachment 3 Please follow the steps below to convert the drive gas of Mindray A3/A4 Anesthesia delivery systems from oxygen to air (Please note the A4 doesn’t have N2O gas yoke). The connection diagrams before and after change are shown below:...
- Page 15 Remove the rear cover panel: Unscrew the six screws on the lower rear panel assembly to remove it. Remove the yoke panel: Unscrew the four screws on the upper rear panel (yoke cover) and pull it out. Mindray North America 800 MacArthur Blvd.
- Page 16 Disconnect hose #36 (Orange) from the Y-piece (connected to hoses #54 and #37). Disconnect hose #60 (Green) from the Y-piece (connected to hoses #38 and #63). Disconnect hose #38 (Green) the Y-piece (connected to hoses #79 and #81). Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 17 Remove the hose #38(Green) and connect it to the outlet of Y-piece (the side with only one outlet), connect the hose #36(Orange) and to another outlet of Y-piece (the side with two outlets). Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 18 Disconnect the AIR line pressure hose from the A3/A4 and connect the O2 line pressure hose from the wall supply, rotate the O2 flow control knob to ensure a continuous flow increase throughout its full range (0 to 15 L/min). Mindray North America 800 MacArthur Blvd. Mahwah, NJ 07430 Tel: 201.995.8000 www.mindray.com...
- Page 19 14. Prominently label the unit that the drive gas has been modified and the system may be used. Please follow the steps below to convert the drive gas of Mindray A4/A3 Anesthesia delivery systems from air to oxygen.
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