4 Construction
The pump’s housing is made of a special high impact plastic designed to reduce interference from electromagnetic fields and to dissipate electrostatic discharge. It is composed of two sections: the base and cover housing. The pump housing is sealed to ensure that the pump is water resistant. The battery compartment is not water resistant.
NOTE:
The
The battery compartment is accessed through a removable door on the side of the base hous- ing. Within the battery compartment is space for the battery and the two battery contacts.
The Medication Cassette reservoir or the administration set is attached to the bottom of the pump by inserting the two hooks on the cassette into the mating hinge pins on the pump. The pump and the reservoir or the administration set are then placed in an upright position on a firm, flat surface. The reservoir or the administration set can be latched in place by inserting a coin in the slot on the pump’s latching button, pushing the button in, and turning the button
NOTE:
The cassette lock must be unlocked before attempting to unlatch the disposable.
NOTE:
The Medication Cassette reservoir and the administration set are intended for single use only.
The keyboard, located on the front housing, is composed of nine membrane switches and is sealed against moisture. All of the keys contain domes to provide a tactile feel when the key is pressed. The keyboard keys are sensed by the pump’s microprocessor.
The custom Liquid Crystal Display (LCD), also located on the front housing, shows the pump status and programmed settings. The dot matrix display consists of 21 character columns with 4 rows of characters, and is selected by the pump’s microprocessor according to status conditions and keyboard entries.
The microprocessor and other circuitry which control the pump are located on two printed circuit boards. The microprocessor board contains the Central Processing Unit (CPU) and its associated circuitry, motor driver circuitry, and other miscellaneous circuitry. The LCD board contains the Liquid Crystal Display with its associated circuitry, and the backlight module with its associated circuitry.
The pumping mechanism subassembly contains the motor, gear train, camshaft, valves, expulsor, sensing disk, infrared light source, infrared detector, occlusion sensor, cassette sensors, lock and latch. Via the motor driver circuitry, the pump’s microprocessor controls motor rotation.
Two external port connectors are utilized for communication and external power input. One of these connectors, the data in/out jack, is used for attachment of the Remote Dose cord. This enables the patient to use either of two options to begin a Demand Dose when using the PCA delivery mode: (1) the Remote Dose button; or (2) the DOSE key.
This jack can also be connected to an external printer via the interface cable. With this feature, the patient or clinician can print various pump reports. The second port is for external power connection. This port, the power jack, can receive input from either an AC adapter or the External Power Source rechargeable power pack.
Connections between the printed circuit boards are designed for ease of manufacturing and serviceability. The keyboard 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.
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