21
c
onstructIon
Construction
The
pump housing
is made of special, high-impact plastic with an internal metallized coating designed
to reduce interference from electromagnetic fields and dissipate electrostatic discharge. It is composed of
3 sections: the base, cover, and battery housing. The pump housing is sealed to ensure that the pump is
water resistant.
Note:
The CADD
®
-Solis VIP pump is water resistant (IPX4), but not waterproof.
The
battery compartment
is accessed through a hinged door on the top of the pump housing. Within
the battery compartment is space for 4 AA batteries or the rechargeable battery pack.
A
CADD™ medication cassette reservoir
or
CADD® administration set
is attached to the bottom of
the pump by inserting the 2 hooks on the cassette into the mating hinge pins on the pump. The pump and
cassette can be latched in place by first rotating the latching lever to the furthest downward position. With
the latching lever in this position, the cassette slides smoothly into place when pushed up into the pump.
The latching lever can then be rotated back up to its latched position. The cassette is locked into place by
inserting a key into the pump lock and turning the lock into the locked position. The cassette must be
unlocked before it can be unlatched. CADD
™
medication cassette reservoirs and CADD
®
administration
sets are intended for single use only.
The
keypad,
located on the front housing, is composed of 7 membrane switches and is sealed against
moisture. All the keys contain domes to provide a tactile feel when the key is pressed. The keypad keys are
sensed by the pump microprocessor. The top left and top right keys are designated “soft keys,” meaning
that they operate based on the messages displayed on the screen directly above them.
The
liquid crystal display (LCD),
also located on the front housing, shows the pump status and
programmed settings. The content of the multicolor display is determined by the pump microprocessor
according to status conditions and keypad entries.
The
microprocessors and other circuitry
which control the pump are located on the printed circuit
board. The board contains 3 microprocessors and their associated circuitry, motor driver circuitry, and
other miscellaneous circuitry. The LCD module contains the liquid crystal display with its associated
circuitry, and the backlight module. The keypad is connected to the microprocessor board via a flex circuit
tail. Flexible circuitry and discrete wires connect the pumping mechanism, motor, and sensors to the
printed circuit boards.
The
pumping mechanism subassembly
contains the motor, gear train, camshaft, valves, expulsor,
sensing disk, occlusion sensor, air detector sensor, cassette sensors, and lock and latch sensors. The pump
microprocessor controls motor rotation.
Three
external ports
are used for communication and external power input:
1. The remote dose cord jack is for attachment of the remote dose cord. Patients may use the remote dose
cord to begin a PCA dose.
2. The AC power jack is for AC power connection, and can receive input from the AC adapter.
3. The USB port communicates with the CADD
™
-Solis Medication Safety Software via a standard mini-B
USB cable attached to a PC computer.
