Patent ID: 9597456
Date: 2017-03-21
CPC Classifications: A61M

Claim:
1. An injection device comprising at least: a body designed to receive a product to be injected, said body having an injection needle provided at a distal end of said body, said body receiving a piston rod and a piston capable of moving in said body between a storage position and an end-of-injection position and of pushing said product through said injection needle, a sleeve for covering said injection needle, said sleeve being movable relative to said body between at least an initial position, in which said injection needle is uncovered, and a final position, in which said injection needle is at least partially covered, and a spring arranged to move said sleeve between said initial position and said final position, wherein, said piston rod comprises at least a first portion and a second portion, said second portion including a deflectable skirt, said first portion and said second portion being axially connected to each other and able to switch between at least a locked position, in which said first portion and said second portion are fixed with respect to each other along a longitudinal axis of said piston rod, and an unlocked position, in which said first portion and said second portion are allowed to move relative to each other at least a predetermined distance along the longitudinal axis of said piston rod, wherein, in said locked position, locking portions of said first portion and said second portion are in interengagement so as to restrict relative movement between said first portion and said second portion along the longitudinal axis of said piston rod, and, wherein, in said unlocked position, said skirt being deflected radially outwardly by direct contact with said body thus causing said locking portions of said first portion and said second portion to be out of interengagement and permit relative movement between said first portion and said second portion along the longitudinal axis of said piston rod.