US Patent 6893420 Syringe for automatic injection of an extemporaneous mixture

The syringe (10) for self-injecting an extemporaneous mixture comprises:a body (60) containing at least two substances (36, 38) initially separated by an intermediate piston (32), which body (60) has two relatively movable portions (64, 66) that are movable between an initial position in which the two substances (36, 38) are separate and a final position in which the two substances (36, 38) are mixed together to form an extemporaneous mixture;automatic means (70, 72) for injecting the extemporaneous mixture out from the body (60) in order to proceed with injection; andlatch means (73) for preventing triggering of the automatic injection means (70, 72).