A disposable double pointed injection needle

(57) Have a needle hub where needle cannula with a small hypodermic needle in which summary subject solution means throwing away was possible, and both ends sharpened is fixed eternally, and a needle hub A given dose setup and an injection mechanism, It may be equipped on シリンジ which has a cartridge which accommodates the medical fluid by which a hypodermic injection is carried out into a human body. A needle hub is equipped with the safety shield to which the external surface top of a needle hub is guided. A safety shield is 付勢 (ed) in the direction which separates from a needle hub with the spring located between the needle hub and the safety shield. A safety shield has two or more projection parts to which the inside of the guide track on the external surface of a needle hub is guided. With a spring, a guide track is moved to the way of a needle hub by the safety shield during injection, and after injection, It is moved in the direction which separates from a needle hub, and it is designed so that it may be locked in an irreversible position for a safety shield to cover needle cannula and prevent the stab of an accidental needle.