Disposable syringe for prevention of reuse

A disposable syringe for prevention of reuse, the disposable syringe comprising:

• a cylinder configured such that an injection needle is installed in one end portion thereof and an opening is formed in a remaining end portion thereof;
• a housing installed above the remaining end portion of the cylinder, and configured such that a through hole opposite to the opening of the cylinder is formed therein;
• a unidirectional entry portion formed in the through hole of the housing, and configured to form a conduit line extending from the through hole to the opening of the cylinder and to have elasticity so that the conduit line is spreadable;
• a plunger configured to generate pressure adapted to introduce a medicine into the cylinder or discharge a medicine from an inside of the cylinder through the injection needle, and to enter into the cylinder through the conduit line of the unidirectional entry portion;
• and
• confinement members formed along a circumference of the plunger, formed to have a larger diameter than the conduit line of the unidirectional entry portion, and configured to enter into the housing while spreading the conduit line of the unidirectional entry portion upon entry through the conduit line of the unidirectional entry portion, the confinement members being disposed at a predetermined position of one end portion of the plunger such that, when the medicine is fully discharged from the inside of the cylinder by the plunger, the confinement members are located between the unidirectional entry portion and the opening of the cylinder.