BDDF00160 Issue 1
37/40
Alaris™ GW 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 .
w
The trumpet and flow rate curves are representative of the typical performance of the Alaris GW 800 Volumetric
Pump when used in combination with a typical dedicated infusion set. The user is responsible for assessing the
performance of the Alaris GW 800 Volumetric Pump when used in combination with a non-dedicated infusion set.
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
