Thomas Mark Kemp;Matthew Ekman;Timothy Donald Barrow-Williams
发明人:
Thomas Mark Kemp,Timothy Donald Barrow-Williams,Matthew Ekman
申请号：
US13996321
公开号：
US20130289525A1
申请日:
2011.12.21
申请国别(地区):
US
年份:
2013
代理人:
摘要：
The invention refers to an auto-injector for administering a dose of a liquid medicament, comprising:an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament, the elongate housing having a distal end and a proximal end with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the housing,spring means capable of, upon activation, pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end, operating the syringe to supply the dose of medicament, and covering the needle on removal of the auto-injector from the injection site,activating 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, characterized in that the spring means is a torsion spring, wherein a first gear arrangement and a second gear arrangement are arranged for respectively converting torque from a first end and a second end of the torsion spring into a translative force, wherein the first end is arranged to be groundable in the housing while the second end is configured to act on a plunger through the second gear arrangement for advancing the needle and supplying the dose, wherein the activating means is arranged to block or release the second gear arrangement and wherein the first end is releasable from the ground in the housing for causing a translation through the first gear arrangement resulting in the needle getting covered.
