Wearable automatic injection device for controlled delivery of therapeutic agents

摘要

WEARABLE AUTOMATIC INJECTION DEVICE FOR CONTROLLED DELIVERY OF THERAPEUTIC AGENTS A wearable automatic injection device (4600) for providing a subcutaneous injection of a therapeutic agent into a patient, the wearable automatic injection device (4600) comprising a housing (5102) comprising a patient contact portion securable to the patient; an injection assembly moveably disposed in the housing (5102) holding a hypodermic injection needle for insertion into the patient, the injection assembly moveable between a retracted position in which the injection needle does not protrude outside the housing (5102) and an extended position in which the injection needle protrudes outside the housing (5102); a vessel provided in the housing (5102) for holding the therapeutic agent; a plunger moveably disposed in the vessel for ejecting the therapeutic agent from the vessel into the injection assembly; a plunger actuation mechanism for actuating the plunger within the vessel; a retraction trigger responsive to a change of state of the wearable automatic injection device (4600) from an injection state to a post-injection state; and a retraction mechanism for automatically retracting the injection assembly from the extended position in the injection state to the retracted position in the post-injection state upon triggering by the retraction trigger.