A syringe comprising a clear syringe barrel, a clear hollow plunge which can be pushed and pulled within the syringe barrel and is open at both ends, a gasket having a throughhole for providing communication between the inside of the plunger and the inside of the syringe barrel and provide a fluid tight seal with the syringe barrel, and a return-flow prevention mechanism which allows the fluid flowing into the plunger to flow in an outward direction from the inside of the plunger.
