Cylinder pump

A cylinder pump comprising:

• a body part having a main body with a coupling groove formed thereon and a front body coupled to the main body by means of hinges;
• a cartridge detachably attached to the coupling groove of the body part;
• a driving part located inside the main body to operate the cartridge and comprising at least one driving motor and a gear mechanism configured to transmit rotational power to rotation members of the cartridge;
• a display part located on the front body and configured to visually output operation information for operating the cylinder pump;
• a controller comprising a processor and configured to control the operation of the driving part;
• and
• an operating part comprising at least one user input key and configured to transmit a user's operating signal or input information to the controller,
• wherein the cartridge comprises:
• an upper housing into which an upper rotation member is inserted;
• and
• a lower housing coupled to the upper housing and into which a lower rotation member is inserted,
• wherein the upper rotation member has an upper rotation member hole formed thereon, the lower rotation member has a lower rotation member hole formed thereon, and a donut-shaped cylinder is formed by inner peripheral surfaces of the upper and lower housings and outer peripheral surfaces of the upper and lower rotation members, the donut-shaped cylinder having an inlet connected thereto to introduce a chemical liquid or blood thereinto, an outlet connected thereto to discharge the chemical liquid or blood therefrom to the outside, and a first piston and a second piston rotating therein.