Precision syringe pump and manufacturing method thereof

A method of manufacturing a syringe pump comprising a motor, a lead screw, and a syringe driving head connected to the lead screw, wherein the motor driving the lead screw is configured to rotate the lead screw clockwise or counterclockwise to drive the syringe driving head and push the plunger to move within the cylinder, wherein the method comprises:

• positioning at least one permanent magnet on the lead screw such that the at least one permanent magnet rotates with the lead screw;
• operably positioning a magnetoresistive sensor in a position on the syringe pump to sense a magnetic signal generated by the at least one permanent magnet;
• and
• operably connecting a micro control unit (MCU) to control rotation direction and velocity of the lead screw rotated by the motor based on the sensed magnetic signal.

A syringe pump for a syringe having a cylinder and a plunger, the syringe pump comprising:

• a motor;
• a lead screw;
• a syringe driving head connected to the lead screw, wherein the syringe driving head is configured to hold the plunger of the syringe, and the motor is configured to rotate the lead screw clockwise or counterclockwise to drive the syringe driving head and push the plunger to move within the cylinder of the syringe;
• at least one permanent magnet located on the lead screw and configured to rotate with the lead screw;
• a magnetoresistive sensor configured to sense a magnetic field generated by the at least one permanent magnet, wherein the magnetoresistive sensor includes an AMR sensor, a GMR sensor or a TMR sensor, wherein a central axis of the at least one permanent magnet and a central axis of the lead screw pass through a center of the sensor;
• and
• a micro control unit (MCU) configured to receive signals from the magnetoresistive sensor and control a direction and velocity of the lead screw rotated by the motor based on the received signals from the sensor, wherein the MCU is configured to monitor a position of the lead screw or the plunger in the syringe, and control an infusion speed of the syringe.