Trumpet Curves And Start-Up Curves - CareFusion Alaris Directions For Use Manual

Trumpet Curves and Start-up Curves

In this pump, as with all infusion systems, the action of the pumping mechanism and variations in individual syringes cause short-term
fluctuations in rate accuracy.
The following curves show typical performance of the system in two ways: 1) the delay in onset of fluid flow when infusion commences
(start-up curves), and 2) the accuracy of fluid delivery over various time periods is measured (trumpet curves).
The start-up curves represent continuous flow versus operating time from the start of the infusion. They exhibit the delay in onset of
delivery due to mechanical compliance and provide a visual representation of uniformity. Trumpet curves are derived from the second
hour of this data. Tests performed per EN/IEC60601-2-24:1998 standard.
Trumpet curves are named for their characteristic shape. They display discrete data averaged over particular time periods or observation
windows, not continuous data versus operating time. Over long observation windows, short term fluctuations have little effect on
accuracy as represented by the flat part of the curve. As the observation window is reduced, short term fluctuations have greater effects
as represented by the mouth of the trumpet.
Knowledge 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, therefore the clinical
effect cannot be determined from the trumpet curves alone.
Start-up and trumpet curves may not be indicative of operation under negative pressure.
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Differences in factors such as size and plunger force in recognised syringes produced by other manufacturers can cause
variations in accuracy and trumpet curves as compared to those represented. Additional curves for recognised syringes
are available upon written request.
For applications where flow uniformity is a concern, rates of 1.0ml/h or above are recommended.
Start-up Trend. Pentaferte 60ml @ 0.1ml/h
0.1
0.1
0.0
0.0
-0.1
0 20 40
Time (mins)
Start-up Trend. Pentaferte 60ml @ 5.0 ml/h
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0 20 40
Time (mins)
60 80 100 120
60 80 100 120
1000DF00601 Issue 7
Trumpet Curve. Pentaferte 60ml @ 0.1ml/h
30.0
20.0
7.68
10.0
-4.08
0.0
-9.99
-12.16
-14.43
-10.0
-20.0
-30.0
0 5 10 15
-40.0
-37.79
-43.82
-50.0
-48.39
-60.0
-55.04
-63.96
-70.0
Observation Window (mins)
Maximum Error Minimum Error
Trumpet Curve. Pentaferte 60ml @ 5.0 ml/h
10.0
5.12
3.95
5.0
2.91
2.32
0.0
1.10
0.61
-1.59
-3.52
-5.0
-10.0
0 5 10 15
Observation Window (mins)
Maximum Error Minimum Error
32/34
Alaris™ Enteral Syringe Pump
Trumpet Curves and Start-up Curves
-16.19
20 25 30 35
-32.64
Linear Mean = -2.5%
1.88 1.81
1.47 1.52
20 25 30 35
Linear Mean = +0.2%