Importance

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Abstract

An injector of the present invention comprises: a syringe (1A) having an injection nozzle (21) at a tip end thereof; a plunger (4) for pushing out a fluid from the syringe, inserted into the syringe; a stopper (5) for sealing the fluid, inserted into the syringe (1A); a high-viscoelastic fluid (9) previously filled into the syringe between the plunger (4) and the stopper (5); and a bypass flow path provided at a tip end portion of the syringe (1A), wherein the syringe is provided on an inner surface of the tip end thereof with a plurality of protrusions (7) defining a terminal position of movement of the stopper (5) and forming a clearance as a fluid flow path between an tip end face of the stopper (5) located at the terminal position and an inner surface of the tip end of the syringe (1A).

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First Claim