Matthew Ekman,Timothy Donald Barrow-Williams,Yannick Hourmand
申请号：
US13579928
公开号：
US08808250B2
申请日:
2011.02.16
申请国别(地区):
US
年份:
2014
代理人:
摘要：
The invention relates to an auto-injector for administering a dose of a liquid medicament (M), comprising:an elongate outer casing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament (M), the outer casing having a distal end (D) and a proximal end (P) with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the outer casing,spring means capable of, upon activation: pushing the needle past the proximal end (P),operating the syringe to supply the dose of medicament (M), andretracting the syringe with the needleactivating means arranged to lock the spring means in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring means for injection, wherein the spring means is a torsion spring grounded at one end in the outer casing and at the other end in a first gear member rotatable about a longitudinal axis, wherein the first gear member, upon rotation, is arranged for translatively moving a second gear member toward the proximal end (P), the second gear member prevented from rotating and coupled to the stopper in order to push it towards the proximal end (P), wherein the first gear member is engaged with the activating means prior to manual operation in a manner to prevent rotation and disengaged from the activating means upon manual operation.
