Abstract: A needle output mechanism which can be connected to a pharmaceutical agent container and a drive module. The base of the needle output mechanism is equipped with a movable connecting member, a needle set, a needle output operation assembly, and a needle retraction operation member. The connecting member is connected to an adapter mechanism. During injection, the needle set in the connecting member can be driven by the needle output operation assembly, and using a hard needle disposed passing through a soft needle and out from the base, outputs a needle which can directly puncture the human body, successively driving the hard needle (133) to disengage from the soft needle and inject the pharmaceutical agent solution by way of the drive module. After injection, the needle retraction operation member can retract the connecting member and the soft needle thereby facilitating operation.

Abstract: An injector comprises a medicament container, an injection module and a driving mechanism. The injection module comprises a conversion mechanism and a needle output mechanism connected to each other. The conversion mechanism is assembled and connected to the medicament container. A driving piston set in the conversion mechanism is assembled and connected to the driving mechanism. A needle set in the needle output mechanism is used for piercing a human body. The driving mechanism drives the driving piston set to convey a medicament liquid in the medicament container to the needle set for injection, such that the medicament container and the injection module, which are related to safety and hygiene, are of single use and are disassembled and discarded after being used. The conversion mechanism is externally connected to the driving mechanism, so that the driving mechanism does not contact the injection medicament liquid during injection and can be reused, thereby reducing material waste.