Needleless syringe comprising an optimized injector-receptacle

Syringe consists of a housing containing a cylindrical reservoir for active fluid to be injected, held between two movable plugs, and a holder (37) with at least two peripheral injection ducts (38) and a blind cavity (31) with a depth that permits separation of inlets (39) from peripheral ducts when downstream plug is in contact with bottom of cavity following operation of a drive that moves the two plugs and the fluid between them. The syringe consists of a housing containing a cylindrical reservoir for the active fluid to be injected, held between two movable plugs, and a holder (37) with at least two peripheral injection ducts (38) and a blind cavity (31) with a depth that permits the separation of inlets (39) from the peripheral ducts when the downstream plug is in contact with the bottom of the cavity following the operation of a drive that moves the two plugs and the fluid between them. Each of the inlets (39) has a recess round an injection duct that is connected by a radial channel to the central cavity. The diameter of each recess is between 1.1 and 1.5 times the diameter of the injection duct, and its depth is 0.5 - 0.6 of the duct's diameter.