Injector

摘要

The present invention related to an injector is provided. The injector includes a case body, a dose setting, a first engagement, a second engagement, an elasticity element, and a button. The dose setting is used to preset a dose. The first engagement is connected with the dose setting. The elasticity element is connected between the first engagement and the second engagement. When the elasticity element is in an extension state, the first engagement and the second engagement are separated. When the button is pushed, the elasticity element is entered into a compress state to combine the first engagement and the second engagement, and then push the dose setting.

主权项

1. An injector comprising:
a case body comprising a first thread; a dose setting comprising a second thread and a first fastener, and the second thread assembled to the first thread to let the dose setting move relatively with the case body so as to preset a dose; a drive stem comprising a third thread used to push a dosage can; a first linkage comprising a second fastener, a first rotatable fastener and a third fastener, and the second fastener clasped with the first fastener; a first engagement comprising a fourth fastener and a first toothed clutch, and the fourth fastener clasped with the third fastener; a second engagement comprising a second toothed clutch and a first groove, and the second toothed clutch engaged with the first toothed clutch; a second linkage comprising a second groove and a fourth thread, and the second groove assembled to the first groove and the fourth thread assembled to the third thread; a first elasticity element connected between the first engagement and the second engagement, and the first engagement separated from the second engagement when the first elasticity element is in an extension state; and a button comprising a second rotatable fastener clasped with the first rotatable fastener, wherein the button is pushed to compress the first elasticity element so as to combine the first engagement and the second engagement, and then push the dose setting.