II. CONTROLLLING THE INFUSION PUMP
In this work, a syringe mechanism was used to serve as
the fluid reservoir and to create the necessary pressure for
infusion. It uses an endless worm thread to position the
plunger, managing in this way the liquid movement. This
process is controlled by a stepping motor where the
rotation of the motor is transmitted to the endless thread
(Figure 1. ). Normally, a spring is used to push the plunger
with a constant force, necessary for a stable infusion
pressure. This type of infusion generates a continuous
high precision flow (with an error below 2%)