Trumpet And Flow Rate Curves - CareFusion Alaris VP Plus Guardrails Directions For Use Manual

Trumpet and Flow Rate Curves

In this Pump, as with all infusion systems, the action of the pumping mechanism and variations cause short-term fluctuations in rate
accuracy .
The following curves show typical performance of the system in two ways: 1) the accuracy of fluid delivery over various time periods is
measured (trumpet curves), and 2) the delay in onset of fluid flow when infusion commences (start-up curves) .
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 and the degree of inter
vascular integration, the therapeutic effect cannot be determined from the trumpet curves alone .
The start-up curves represent continuous flow versus operating time for two hours 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 IEC/EN60601-2-24 standard .
Start-up Graph at 1 .0ml/h (Initial Period)
2.00
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0 20 40
Time (minutes)
Trumpet Graph at 1 .0ml/h (Initial Period)
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
0 5 10
Observation Window (minutes)
Maximum Error Minimum Error
60 80 100 120
15 20 25 30
Overall Mean = -0 .8%
1000DF00660 Issue 9
Alaris™ VP Plus Guardrails™ Volumetric Pump
Trumpet Graph at 1 .0ml/h (After 24 Hours)
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
0 5 10
Observation Window (minutes)
Maximum Error
Trumpet Graph at 1 .0ml/h (After 72 Hours)
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
35 0 5 10
Observation Window (minutes)
Maximum Error
45/48
Trumpet and Flow Rate Curves
15 20 25
Minimum Error Overall Mean = -0 .3%
15 20 25
Minimum Error Overall Mean = 0 .0%
30 35
30 35