Abstract: The invention is a dosing pump that can be worn on the body of a patient for subcutaneously delivering liquid with centi-micro liter accuracy to his/her body. The dosing pump comprises a pump unit, an internal control unit; and a reservoir containing the liquid. The pump unit comprises a pump block (12) comprising a pump chamber (118) with a pump diaphragm (107) stretched across its entrance and a pump pin cylinder (110) extending from the exterior of the pump block to the entrance to the pump chamber; a pump pin (20) that is located in the pump pin cylinder and a motor unit comprising a motor and gear system. When the motor is activated, the rotational motion of the motor and the gears in the gear system is transformed into cyclic back and forth linear motion of the pump pin in the pin cylinder pumping the liquid from the reservoir into the patient.