EP2229969A1 — Injection device

USPTO Abstract

The present invention relates to an injection device (100) comprising : - a container (13), a needle hub (3) movable between an exposed position and a retracted position - a piston (2) and a plunger rod (4), - biasing means (8) for moving said needle hub (3) from its exposed position to its retracted position, - retaining means (12b, 32) for maintaining said needle hub (3) in its exposed position, - deactivating means (20, 33) for releasing said retaining means upon release of distal pressure exerted on said plunger rod (4), characterized in that said deactivating means include at least one slope (20) located on the distal face of said piston (2) and a complementary slope (33) located on the proximal face of said needle hub (3), said slope (20) and complementary slope (33) being able to cooperate with each other so as to cause the rotation of said needle hub (3) with respect to said piston (2) and to said container (13) and free the extension of said biasing means (8).