24
Pumping Operation
Pumping Characteristics
If the fluid path to the patient becomes blocked, the pump tubing expands as pumping occurs. When the
amount of inflation corresponds to 18 ± 9 psi (1.24 ± 0.62 bar), the downstream occlusion analog sensor
trips, causing the microprocessor to stop the pump mechanism and issue visual and audible alarms. Thus
the maximum pressure is 27 psi (1.86 bar).
To deliver the amount of drug specified by the parameter settings, the pump microprocessor causes the
pump mechanism to deliver 0.05 mL fluid pulses timed according to the desired rate. At rates higher than
15 mL/hr, 2 pulses in succession are given. Thus, to deliver 20 mL/hr, for example, the microprocessor
solves the following equations:
Mechanism activations per hour =
Time (seconds) between activations =
Rate
(mL/hr)
Volume Resolution
(mL)
Cassette or Admin Set 0 – 15
15.1 – 30
0.050
0.100
The microprocessor uses the timer circuits to accurately time the 18 seconds (in this example) between
mechanism activations.
Cassette “Type” Sensor Circuit
The cassette “Type” sensor system consists of 3 pins protruding from the bottom of the pump mechanism
that interface with the attached CADD
®
administration set and associated circuitry. Each type of
administration set designed to work with the CADD
®
-Solis pump contains a unique code programmed
into the set via features molded into the plastic. When a set is latched to the pump, the features press
against the pins in the pump mechanism in a pattern unique to that set type.
Latch/Lock Sensor Circuit
Latch and Lock sensors allow the microprocessor to detect the positions of the latch lever and lock button.
This prevents attempted fluid delivery when the set is not correctly latched to the pump. In addition, it
allows the microprocessor to stop fluid delivery and enable audible and visual alarms if the set is unlatched
during fluid delivery.
20 mL/hr
0.1 mL/activation
200 activations/hr
20
0.1
=
=
3600 s/hr
activations/hr
18 seconds between activations
3600
200
=
=
Содержание CADD Solis 2100
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