NEED
Our client envisioned a microcomputer controlled, precision,
intravenous infusion pump for hospital use. They had had an extensive background
with surgical tubing and custom I.V. sets but desired to introduce advanced
electronic devices and associated disposables to control the rate of I.V. fluid
flow. The I.V. controller was to have programmable flow rate, LCD display of
totalized volume, fault detection and alarm indication and emergency battery
backup power. Of course the unit was required to meet UL and AAMI standards.
SOLUTION
Mitsi was given the responsibility of developing the electronic
portion of the I.V. unit and writing and integrating the firmware which
controlled the unit's operation. Flow rate was programmable and controlled over
a wide range. Flow was also precisely monitored to provide the closed control
loop required for long term, accurate performance.
The flow monitor was also used by the microcomputer to compile
and display the total volume control. Air in the line and incorrect flow were
detected, triggering alarms and displays as well as implementing appropriate
corrective action as determined by the microcomputer. Mitsi succeeded in
compressing the multiple tasks and monitoring operations into the small program
space available in the simple microcomputer. Total operation of the unit was
also permitted while the unit was powered by the rechargeable battery for over
twenty-four hours.
