Patent ID: 8858512
Filing Date: 2014-10-14
Classification: A61M

Abstract:
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.