Operator's Manual

83
RefeRences and TRoubleshooTing
RefeRences and
TRoubleshooTing
Accuracy Test Results
In this device, as with all infusion pumps, the motion of the pumping mechanism and variations in individual
disposables cause short-term fluctuations in rate accuracy. The following curves show typical performance of
the pump system in two ways:
1. A flow versus time graph during the stabilization period (start-up curves).
2. The accuracy of fluid delivery of particular time periods or ‘observation windows’ is measured (trumpet
curves).
The start-up curve displays flow rate continuously from the start of the infusion. The curve visually represents
flow rate uniformity. The trumpet curve is derived from the last hour of this data. Tests performed per IEC
60601-2-24 standard.
Over long observation windows, short term fluctuations have minimal effect on accuracy as represented
by the flat part of the curve. As the observation window is reduced, short term fluctuations have an
increasing effect as represented by the “mouth” of the trumpet. Being aware of system accuracy over various
observation windows may be of interest when certain drugs are being administered. Short term fluctuations
in rate accuracy may have clinical impact depending on the half-life of the drug being infused, both the
trumpet curve and drug half-life should be taken into consideration.
Start-up curves over the stabilization period T(1)
Flow rate (10 mL/hr) CADD® administration set with Flow Stop
Start-Up Graph
Flow (mL/hr)
Time (Mins)
0 200 400 600 800 1000 1200 1400
12
10
8
6
4
2
0
Flow Qi
Set Rate
1600
Trumpet curves over the analysis period T(2)
Flow rate (10 mL/hr) CADD® administration set with Flow Stop
Trumpet Curve Over T2 (Analysis Period of 50 min)
Percentage Error (%)
Observation Window (Mins)
0 2 4 6 8 10 12 14
60
40
20
0
-20
-40
-60
Ep(Min)
Ep(Max)
Zero Error (%)
Mean Flow Error (%)