Injection syringe

An injection syringe for injecting a first injectable product into a body injection site of an individual, comprising:

• a first syringe barrel containing the first injectable product, a first plunger being displaceably mounted in said first syringe barrel;
• a hollow needle adapted to being inserted into said body injection site;
• an adapter connected to said first syringe barrel and said needle, and
• a verification device configured to ensure that, when the first injectable product is injected, said hollow needle is not introduced into a blood vessel, said verification device comprising:
• a second syringe barrel containing a second product and being connected to said adapter;
• a second plunger being displaceably mounted in said second syringe barrel so as to cause a depression at a distal end of said hollow needle whereby a sample of body fluid is aspirated into said second syringe barrel through said hollow needle and said adapter and is mixed with the second product contained in said second syringe barrel giving a red color if said hollow needle is inserted into a blood vessel and the aspirated fluid is blood,
• wherein the adapter comprises:
• a first inlet port in fluidic communication with the first syringe barrel,
• a second inlet port in fluidic communication with the second syringe barrel,
• an outlet port in fluidic communication with the needle,
• a conduit suitable for placing the first inlet port, the second inlet port and the outlet port in fluidic communication, and
• at least one shutter cooperating with the conduit, which shutter is configured to alternately allow or prevent:
• fluidic communication between the first inlet port and the outlet port, and/or fluidic communication between the second inlet port and the outlet port,
• wherein the conduit comprises
• a cavity,
• a first fluid communication pathway connecting the first inlet port to the cavity through a first orifice,
• a second fluid communication pathway connecting the outlet port to the cavity through a second orifice, and
• a third fluid communication pathway connecting the second inlet port to the cavity through a third orifice,
• wherein the cavity is arranged at an intersection between the first, second and third fluid communication pathways of the conduit, the shutter being in the form of a movable element slidingly mounted within said cavity between a first position at which the movable element occludes the fluidic communication between the second inlet port and the outlet port upon discharge of the first injectable product out of the first syringe barrel for the purpose of injecting the first injectable product into the body injection site, and a second position at which the movable element occludes the fluidic communication between the first inlet port and the outlet port when aspirating the fluid sample into the second syringe barrel, the cavity having a general tubular shape of substantially circular or oblong cross-section and the movable element representing the shutter having a cross-sectional shape corresponding substantially to the cross-section of the cavity, and
• wherein, when the first plunger is pulled backwards to create a depression in the first fluid communication pathway of the conduit, the shutter is aspirated, inside the cavity, in the direction of the first orifice in order to occlude the fluidic communication between the first inlet port and the outlet port and to allow fluidic communication between the second inlet port and the outlet port to enable the aspiration of a body sample from the injection site, into said second syringe barrel through the hollow needle and the adapter such that the body fluid sample is aspirated into the second syringe barrel through the hollow needle and the second communication pathway and the third communication pathway under the effect of a depression created at the distal end of the hollow needle when the second plunger is pulled back.