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1.0 INTRODUCTION
The MAXBlend2 is a compact air/oxygen gas mixing device which incorporates
the use of a battery powered oxygen monitor. The gas mixing device (blender)
provides precise mixing of medical grade air and oxygen, while the monitor
measures the selected oxygen concentrations from the blender’s gas flow
and displays these measured concentrations on a digital display. The monitor
provides high and low alarm limits which, when exceeded, cause an audible
and visual alarm.
1.1 Indication for Use
The MAXBlend2 is designed to provide a continuous air/oxygen gas mixture to
infant, pediatric, and adult patients. It is a restricted medical device intended
for use by qualified, trained personnel, under the direction of a physician, in
institutional environments where the delivery and monitoring of air/oxygen
mixtures is required.
1.2 MAX-550E Oxygen Sensor
The MAX-550E is a galvanic, partial pressure sensor that is specific to oxygen.
It consists of two electrodes (a cathode and an anode), a teflon membrane
and an electrolyte. Oxygen diffuses through the teflon membrane and
immediately reacts electrochemically at a gold cathode. Concurrently, oxidation
occurs electrochemically at a lead anode, generating an electrical current
and providing a voltage output. Electrodes are immersed in a unique gelled
weak acid electrolyte which is responsible for the sensors long life and motion
insensitive characteristic. Since the sensor is specific to oxygen, the current
generated is proportional to the amount of oxygen present in the sample gas.
When no oxygen is present, there is no electrochemical reaction and therefore,
negligible current is produced. In this sense, the sensor is self-zeroing.
CAUTION: The MAX-550E oxygen sensor is a sealed device containing a mild acid
electrolyte and lead (Pb). These materials are hazardous waste constituents and should
be disposed of properly, or returned to Maxtec for proper disposal or recovery.
CAUTION: Dropping or severely jarring the sensor after calibration may shift the
calibration point enough to require re-calibration.
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