93
Medfusion® Model 3500 pump V6
Operator’s Manual
Time to occlusion
The time for the pump to detect an occlusion is
affected by three factors:
1. Occlusion Pressure Setting
– High (H), Normal
(N), Low (L), or Very Low (VL).
2. Flow Rate Setting.
3. Syringe & Tubing Compliance
, (i.e., softness of
syringe plunger tip or tubing).
Reference page 122 for time-to-occlusion
specifications. See guidelines for pump performance
on time to occlusion. At lower rates smaller syringes
have shorter occlusion times, which is why the
smallest available syringe for the volume to be
delivered should always be used.
Occlusion trend graph during
delivery
The pump automatically monitors
occlusion
or
syringe backpressure during any infusion. This trend
appears in a
bar graph
on the right side of the display
during delivery. The letter at the top of the graph
indicates the configured occlusion alarm level:
Code
Meaning
Relative Pressure
VH
Very High (
fixed
for 1 mL syringes)
50 psi (345 kPa)
H
High
16 psi (110 kPa)
N
Normal
12 psi (83 kPa)
L
Low
8 psi (55 kPa)
VL
Very Low
4 psi (28 kPa)
The pressure graph is scaled between 0 psi at the
bottom and the Occlusion setting pressure at the top.
The occlusion limit can be set from Very Low to High
for syringes with a volume greater than 1 mL. The
occlusion limit is a fixed value for 1 mL syringes. The
setting for 1 mL syringes is fixed at 50 psi, meaning
the setting cannot be changed. The reason for this is
that at lower pressure settings occlusion alarms would
be frequent.
Pressures in the above table are only approximations.
This is because syringe friction affects the actual
pressure level.
Occlusion limit default is set up using PharmGuard
®
Toolbox 2, which was completed by the person
responsible for custom Configuration before the
pumps were delivered to a work area.
Override the default Occlusion limit for a particular
infusion from the
Options
menu if that option is
enabled.
The pump takes the pressure measurement
approximately every second:
• The
right side
of the bar is the most current
reading.
• The
middle bar
is the 1 minute average.
• The
far left bar
is the 2 minute average.
Therefore:
PVD
0.55
m
L
RATE
10
m
L/
Hr
LOCK
N
CHG RATE
OPTIONS
CLEAR TVD
100%
B-D
60
m
L
• If the graph slopes upward from left to right,
then the pump may be headed toward occlusion.
PVD
0.55
m
L
RATE
10
m
L/
Hr
LOCK
N
CHG RATE
OPTIONS
CLEAR TVD
100%
B-D
60
m
L
• If the graph is level, then backpressure is steady.
FlowSentry™ pressure monitoring
(rapid occlusion detection)
FlowSentry
™
pressure monitoring is an internal
program unique to Medfusion
®
pumps that
monitors and analyzes delivery pressure. When
activated, FlowSentry™ pressure monitoring alerts
to the existence of an occlusion much more rapidly
than conventional occlusion alarm systems. The
sensitivity of the FlowSentry™ pressure monitoring
setting is determined by the selection in the custom
Configuration, using PharmGuard
®
Toolbox 2.
How do you know if FlowSentry
™
pressure
monitoring has been activated?
• During startup and during the stabilization
period following a rate change a pound sign (#)
will appear to the left of the pressure trend graph.
The presence of the # indicates that FlowSentry
™
pressure monitoring is active, and that the
delivery pressure is stabilizing.
Summary of Contents for Medfusion 3500
Page 151: ......
