Patent ID: 9358345
Filing Date: 2016-06-07
CPC Classification: A61M

Claim Text:
1. An auto-injector for administering a dose of a liquid medicament, the auto-injector having a distal end and a proximal end with an orifice intended to be applied against an injection site and comprising: an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament, wherein the syringe is slidably arranged with respect to the housing, a drive capable of, upon activation: pushing the needle from a retracted position into an advanced position through the orifice and past the proximal end, and operating the syringe to supply the dose of medicament, a plunger for transmitting power from the drive to at least one of the syringe and the stopper, a plunger arm attached to the plunger and comprising a dog, and a shuttering mechanism arranged to lock the drive in a compressed state prior to manual operation and capable of, upon manual operation, releasing the drive for injection, the shuttering mechanism further being arranged to control translation of the plunger and comprising: a fixed shutter attached to the housing and comprising a fixed protrusion, the fixed protrusion arranged to engage the dog of the plunger arm to prevent translation of the plunger in a proximal direction, the dog of the plunger arm being resiliently biased toward the fixed shutter, and a moving shutter arm arranged alongside the fixed shutter and moveable between a locking position and an unlocking position, the moving shutter arm comprising a moving protrusion with a ramp, the moving shutter arm being configured to: disengage the dog from the fixed protrusion when the moving shutter arm is moved to the locking position and the dog is engaged to the fixed protrusion, and enable the dog to engage with the fixed protrusion when the moving shutter arm is in the unlocking position.