BDDF00144 Issue 1
37/40
Alaris™ GW 800 Volumetric Pumps
Trumpet and Flow Rate Curves
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 clinical 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 IEC60601-2-24 standard .
Start-up Graph at 1 .0ml/h (Initial Period)
273-001 Infusion Set
Start-up Graph at 25 .0ml/h (Initial Period)
273-001 Infusion Set
Flo
w R
at
e (ml/h)
Start-up Graph at 1.0 ml/h (Initial Period)
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
10
20
30
40
50
60
70
80
90
100
110
120
Time (minutes)
Flow (ml/h
)
Flo
w R
at
e (ml/h)
Start-up Graph at 25.0 ml/h (Initial Period)
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
0
10
20
30
40
50
60
70
80
90
100
110
120
Time (minutes)
Flow (ml/h
)
Time (minutes)
Time (minutes)
Trumpet Graph at 1 .0ml/h (Initial Period)
273-001 Infusion Set
Trumpet Graph at 25 .0ml/h (Initial Period)
273-001 Infusion Set
Flo
w R
at
e (%)
Trumpet Graph at 1.0 ml/h (Initial Period)
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
0
5
10
15
20
25
30
35
Flow Error (%
)
Flo
w R
at
e (%)
Trumpet Graph at 25.0 ml/h (Initial Period)
-15
-10
-5
0
5
10
15
0
5
10
15
20
25
30
35
Flow Error (%
)
Observation Window (Minutes)
Observation Window (Minutes)
Maximum
Rate Error
Minimum
Rate Error
Overall Mean Error
= +2 .5%
Maximum
Rate Error
Minimum
Rate Error
Overall Mean Error
= +1 .1%
Trumpet Graph at 1 .0ml/h (After 24 Hours)
273-001 Infusion Set
Trumpet Graph at 25 .0ml/h (After 24 Hours)
273-001 Infusion Set
Flo
w R
at
e (%)
Trumpet Graph at 1.0 ml/h (After 24 Hours)
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
0
5
10
15
20
25
30
35
Flow Error (%
)
Flo
w R
at
e (%)
Trumpet Graph at 25.0 ml/h (After 24 Hours)
-15
-10
-5
0
5
10
15
0
5
10
15
20
25
30
35
Observation Window (minutes)
Flow Error (%
)
Observation Window (Minutes)
Observation Window (Minutes)
Maximum
Rate Error
Minimum
Rate Error
Overall Mean Error
= +4 .2%
Maximum
Rate Error
Minimum
Rate Error
Overall Mean Error
= +1 .1%
Note:
The typical flow rate and trumpet curves - Infusion set 273 001
