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References and Troubleshooting
Start-up curve over the stabilization period
Flow rate: Intermediate (10 mL/hr)
0 30 60 90 120 150 180 210 240 270 300
Flow
0
2
4
6
8
10
12
Trumpet Curve over T(2) Period:
Intermediate rate (10 mL/hr)
T (min)
Ep
max
Ep
min
Percentage error of ow
Observation Interval
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2 50 11 19 31
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. Trumpet curves
are derived from the sixth hour of this data. Tests
performed per IEC60601-2-24 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.
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