Unilaterally driven drug infusion device

A unilaterally driven drug infusion device, comprising:

• a reservoir, a piston and a screw, the piston connected with the screw and arranged in the reservoir;
• a driving unit comprising at least one rotating shaft and at least one driving member, wherein the driving member includes at least one driving end, and the driving member rotates around the rotating shaft to advance or reset the driving end;
• at least one driving wheel provided with wheel teeth, the driving end which advances pushes the wheel teeth to rotate the driving wheel, thereby driving the screw forward;
• a linear actuator and a reset unit respectively connected to the driving member, wherein the linear actuator and the reset unit respectively apply driving power to the driving member to advance and reset the driving end;
• and
• at least two first blocking walls, arranged at one side of the driving unit to limit an advancing position of the driving unit,
• wherein when the driving member is in a first position, the driving member does not contact the first blocking walls, when the driving member is in a second position, the driving member contacts one of the first blocking walls, when the driving member is in a third position, the driving member contacts another one of the first blocking walls.