Patch-type drug infusion device

A patch-type drug infusion device, comprising:

• a control structure provided with multiple first fastening portions and first electrical contacts exposed on a surface of the control structure;
• and
• an infusion structure including a case, a power supply, a flexible circuit board, and an elastic conductor, wherein one end of the elastic conductor is electrically connected to an electrical connection end on the flexible circuit board while an other end of the elastic conductor is electrically connected to the power supply, the infusion structure is provided with multiple second electrical contacts exposed on a surface of the case and second fastening portions that cooperate with the first fastening portions, the first fastening portions and the second fastening portions are fastened, the first electrical contacts connect with the corresponding second electrical contacts,
• wherein the case includes an outward extending portion where is configured for the control structure to be assembled, and a block is provided on the outward extending portion, when the control structure is assembled onto the outward extending portion along a first direction, the block is adjacent to the control structure to prevent the control structure from detaching the infusion structure along a second direction.