Patent ID: 9707344
Date: 2017-07-18
CPC Classifications: A61M

Claim:
1. An autoinjector comprising: a housing for receiving a syringe, a drive mechanism for driving the syringe forwardly and for expelling a dose, the drive mechanism including forward and rearward generally coaxial springs, and an intermediate drive member disposed between the forward and rearward springs, and biased against a forward end of the rearward spring and biased against a rearward end of the forward spring, such that i) the rearward spring acts against the housing and against the intermediate drive member and ii) the forward spring acts against the intermediate drive member and against the syringe to enable both the forward and rearward springs to be used in the forward movement of the drive mechanism in delivery of the dose; and a release arrangement including a trigger element held in a first, rearward pre-use, cocked position by a bias and movable forward against the bias to a second, forward depressed position to fire the mechanism and to release the forward and rearward springs, wherein the bias for the trigger element is provided by the rearward spring.