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Technical Description
The following details outline the basic safety checks designed into the pump to minimise the possibility of under or over infusions.
Power on Self-Tests
The pump is single fault tolerant, which means the pump will either stop and alarm, or continue to infuse uninterrupted as a result of a
single fault failure. During the power on self-test sequence the pump automatically performs system integrity checks and will alarm and
display
should any of these tests fail. Refer to 'Power On/Off' section of this DFU.
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Air-in-Line
Two ultrasonic transducers continuously check for the presence of air in the Infusion set throughout the infusion. This air-in-line feature
operates in two modes:
• Single Bubble Detection - The pump will alarm and display
volume alarm limit is detected. The alarm limit can be configured to 50, 100, 250 or 500 µL. See also 'Configurable Options' section
of this DFU.
• Air-in-Line Accumulation - This accumulation feature monitors the volume of air that passes through the Infusion set by
accumulating the volume of individual bubbles over a 15 minute window. This feature is particularly useful with infusions for
patients that are highly sensitive to air (i.e. infants, paediatrics) or when infusing products that create significant volumes of small
air bubbles.
Although an individual bubble may not exceed the pre-programmed threshold, the additive volume of bubbles in a
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15 minute volume may be sufficient to initiate an air-in-line alarm indicated by an Air OCCL message.
Downstream Occlusion Pressure
The pump includes a pressure sensor to monitor the downstream Infusion pressure. When the IV pressure exceeds the alarm pressure
limit, as a result of, for example kinked IV tubing or blocked cannula, the pump will alarm and display
To compensate for the variability in Infusion set tubing the pump performs a relative, baseline pressure measurement. The pump takes a
reference pressure from the IV line when the infusion commences and alarms at a preset limit above the baseline pressure. The pressure
alarm limits are 250, 350 and 500 mmHg above the baseline pressure, corresponding to the low, normal or high, pressure limits. To avoid
excessively large pressures the pump is capped at 1000 mmHg.
Upstream Occlusion Pressure
To detect upstream occlusions resulting from, for example, closed clamps or occluded drip chamber filters the pump continuously
monitors the upstream IV tubing pressure. Upon detection of an occlusion the pump will alarm and display
the ultrasonic transducers of the air sensor to monitor for upstream occlusions and is therefore unable to differentiate an upstream
occlusion from an air bubble.
Pump Based Free Flow Protection
The pump is equipped with a flow stop mechanism that is designed to occlude the IV tubing when the pump door is open and the
tubing remains properly loaded in the pump. Raising the flow stop mechanism lever arm and pushing it to the right activates this
mechanism. Once activated, the user inserts the IV tubing into the tubing guide channel.
When the pump door is closed, the bevel integrated into the door releases the lever arm such that it will automatically occlude the
tubing when the door is re-opened. (Refer to 'Features of the Alaris® GW Volumetric Pump') The tubing can be removed from the tubing
guide channel by repeating the activation of the lever arm. Once the lever arm is re-activated and the door is opened, the flow stop
mechanism no longer occludes flow in the tubing.
Anti-Bolus Function
The anti-bolus function is designed to reduce the bolus that may occur upon the release of an occlusion following a downstream
occlusion alarm. (Detection of a downstream occlusion is indicated by a
to neutral within 15 seconds by pumping backwards briefly and measuring the Infusion set line pressure through the in-line pressure
detection system. This feature can prevent the fluid bolus to the patient that can occur upon the release of an occlusion, which may be
caused by a downstream clamp.
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1000DF00430 Issue 4
Alaris® GW Volumetric Pumps
whenever a single air bubble greater than the air in line
alarm.) The pump returns the Infusion set line pressure
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Technical Description
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. The pump uses
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