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Tests at low alarm levels may alarm immediately - the force at these levels is commonly less than the friction in the syringe (with no additional fluid pressure).
The result is that the pressure relating to the low forces will be less than the nominal quoted occlusion pressure.
Bolus volume following occlusion will be minimised by the back off feature if enabled. The back off will reduce the line pressure by removing the volume
stored in the occluded line and deduct this volume from the volume infused. Back off will terminate if the pressure reaches the level recorded by the
pump when the infusion was last started, or a maximum back off volume has been withdrawn from the infusion line. It will also terminate if the volume
infused reaches 0.0ml, or a VTBI reaches the value at which it was set.
Occlusion Pressure Limits
Time to alarm following occlusion is achieved in less than 30 minutes at rates of 1 ml/h and higher by the appropriate selection of occlusion
levels.
Use of the dedicated pressure set is recommended. Its use permits the occlusion alarm pressure (mmHg) to be set accurately, with a small
operating margin between the alarm and normal infusion pressures. When using infusion pumps without a pressure set, line pressures are
estimated from pumping force. For this reason the occlusion alarm needs to be set with an operating margin of at least one level between
the alarm and normal infusion levels. The ability to set a small operating margin permits short time to alarm and small potential bolus
volumes to be achieved. Bolus volumes can be minimised as described in the Alarms and Warnings - Occlusion or by enabling the back
off general option.
Without Pressure Set fitted, G40020B - (Standard disposable extension set)
The following graphs show the typical values for time to alarm and bolus volume that can be expected in the event of an occlusion when
the BD Plastipak 50 ml syringe is selected with a G40020B standard extension set.
l
Occlusion level on Alaris® GH Syringe Pump or other pumps with occlusion
levels: L2 (approx. 200 mmHg).
l
Auto pressure setting on Alaris®
CC Syringe Pump: (e.g. 55 mmHg).
l
T1 << T2.
No Pressure Set
Time To Alarm - 1.0 ml/h
No Pressure Set
Bolus Volume without back off
No Pressure Set
Bolus Volume with back off
No Pressure Set
Time To Alarm - 5.0 ml/h
Occlusion Level
hr
:min:sec
Occlusion Level
hr
:min:sec
Occlusion Level
Occlusion Level
ml
typical
typical
typical
typical
ml
With Pressure Set fitted, G30402M - (Standard disposable extension set)
The following graphs show the typical values for time to alarm and bolus volume that can be expected in the event of an occlusion when
the BD Plastipak 50 ml syringe is selected with a G30402M extension set with occlusion sensing disc.
Auto Setting :
Alaris® CC Syringe Pump
Alaris® CC Syringe Pump
Alaris® GH Syringe Pump
