Mindray A5 Operating Instructions

General System Overview Product Description
1 - 4 046-003777-00 A5/A3™ Operating Instructions
• Virtual On-Screen dual flow tube and numerical readouts to display the O
2
, N
2
O, and Air flows
• A knob guard to prevent inadvertent movement of the flow control knobs
• Gas supply gauges to indicate the gas pipeline supply pressures and gas cylinder pressures
• Mechanical total flowmeter to display the combined flow of O
2
, Air, and N
2
O
•An O
2
flush button
• A single auxiliary combined output with O
2
and Air flowmeters
Safety systems within the A5/A3 work to prevent hypoxic mixtures from being delivered to the
patient. Nitrous oxide will not be delivered unless oxygen flow is present. A pneumatic safety system
assures that at least 21% O
2
is present when setting mixtures of O
2
and N
2
O. Additionally, if the A5/A3
is placed in the standby mode, O
2
fresh gas flow is not available.
WARNING: Ensure that both O
2
and N
2
O flow controllers are turned OFF fully at the
start and at the end of each case.
All A5/A3 units are designed to maintain a safe O
2
:N
2
O ratio by allowing nitrous oxide to be set to a
flow rate that is proportional to a previously adjusted flow of oxygen. The N
2
O flow is limited by the
flow of O
2
so that a safe ratio of no less than 21% oxygen can be maintained. The A5/A3 is designed
to maintain oxygen flow at its previously set level when N
2
O is decreased.
When adjusting N
2
O and O
2
flow rates, always adjust the oxygen flow first to enable the nitrous oxide
flow. To add N
2
O to the fresh gas flow, open the N
2
O flowmeter valve, but only after opening the O
2
flowmeter valve.
1.1.4 Flow Control
Flow Control needle Valve and Knob:
Three independent flow control knobs allow setting the input flow rates of N
2
O, Air, and O
2
into the
fresh gas flow.
N
2
O Automatic Cutoff:
An N
2
O automatic cutoff valve stops the flow of N
2
O if O
2
flow is less than 200 ml/min.
O
2
Pressure Loss Alarm:
An O
2
pressure loss alarm announces when oxygen pressure is less than 220 kPa (32 psi).
Oxygen Ratio Controller:
An O
2
ratio controller ensures that there is always at least 21 % oxygen concentration in the fresh gas
flow when N
2
O is fully open.
1.1.4.1 Flow/Pressure Sensing
The breathing system block contains patient flow and pressure sensors to measure inspiratory flow,
expiratory flow, and inspiratory pressure. These sensors enable spirometry as well as standard
pressure and flow monitoring.
1.1.5 Vaporizer Mounting
The A5/A3 contains a 2-position Selectatec-type vaporizer mounting system to enable anesthetic
agents to be introduced into the fresh gas flow. The mounting system adapts vaporizers with
interlock, which permits only one agent at a time to be administered. Lighting above the vaporizers
enables them to be seen in a dim light environment. Maximum three vaporizers can be mounted at
any one time. The A5 and A3 comes standard with a two vaporizer mount. Third vaporizer mount is
optional. Halothane, Enflurane, Isoflurane, Desflurane, and Sevoflurane vaporizers can be used.
For the A5 model, additional, non-functional vaporizer parking spot on the side of the unit is provided
as part of the standard configuration.

Mindray A5 Specifications

General

Brand	Mindray
Model	A5
Category	Medical Equipment
Language	English