Structure and princIPLe of injection pump The injection pump is composed of stepper motor and its driver, screw rod and bracket. It has reciprocating screw rod and nut, so it is also called screw pump. The nut is connected with the piston of the syringe, and the syringe contains the liquid medicine. When working, the single-chip microcomputer system sends out control pulse to make the stepping motor rotate, and the stepping motor drives the screw rod to turn the rotary motion into a linear motion, which pushes the piston of the syringe to inject and infuse the medicine liquid in the syringe into the human body. By setting the rotation speed of the screw, the pushing speed of the syringe needle plug can be adjusted, so as to adjust the drug dose (the drug delivery speed is 0.1 ~ 99.9nd)_ ／h)。
