Patent ID: 6893420

Claim:
A syringe for self-injecting an extemporaneous mixture, the syringe being of the type comprising: a body containing at least two substances initially separated by an intermediate piston, which body has two relatively movable portions that are movable between an initial position in which the two substances are separate and a final position in which the two substances are mixed together to form an extemporaneous mixture; automatic injection means for injecting the extemporaneous mixture out from the body in order to proceed with injection; and latch means for preventing triggering of the automatic injection means; wherein the syringe comprises locking means for locking the latch means that prevents the automatic injection means from being triggered before the two substances have finished being mixed together, wherein the latch means comprises a latch member movable between an active position, for latching the automatic injection means, and an inactive position where the automatic injection means are not latched, the locking means including complementary hooking profiles for hooking by elastic engagement provided on said latch member and on a first moving portion of the body, said complementary hooking profiles being normally mutually engaged, and wherein the second moving portion of the body includes at least one surface for disengaging the complementary hooking profiles and adapted to disengage said complementary hooking profiles only when the two moving portions of the body are in their final position.