Patent ID: 8911401
Filing Date: 2014-12-16
Classification: A61M

Abstract:
1. An injection device comprising a pre-filled syringe comprising a barrel with an inner cavity in fluid communication with a hypodermic needle attached to a distal end of the pre-filled syringe, a piston fluid-tightly sealing a proximal end of the inner cavity and a safety device comprising a support body for retaining the pre-filled syringe therein, an outer body operably connected to the piston, a needle shield, a releasable retaining means wherein the needle shield, the support body and the outer body are telescopable relative to each other, wherein the piston is movable in a distal direction to expel a medicament contained in the inner cavity through the hypodermic needle by a manual actuation of the outer body, wherein a telescoping movement of the outer body with respect to the support body is restricted by the retaining means when the needle shield is moved with respect to the support body in a proximal direction from an initial position towards a retracted position, and wherein the retaining means is released when the needle shield reaches the retracted position allowing for a telescoping movement of the outer body with respect to the support body to expel the medicament contained in the pre-filled syringe through the hypodermic needle, wherein the retaining means comprises a radial projection connected to or being an integral part of one of the support body or the outer body and a longitudinal recess formed into the other of the support body or the outer body and adapted to receive the radial projection, wherein the longitudinal recess comprises a first section and a second section separated by a web from each other, wherein the radial projection engages the first section of the longitudinal recess to prevent the telescoping movement of the outer body with respect to the support body until the needle shield has reached a retracted position, wherein the radial projection has to overcome the web before the outer body is allowed to telescope with respect to the support body, wherein a retention force required to deflect the radial projection exceeds a force required to move the needle shield with respect to the support body from the initial position to the retracted position.