Paste syringe

Abstract

Provided is a paste syringe which is capable of releasing, as much as possible, the internal pressure which is generated inside a syringe main body as a result of pressure being applied to paste, and consequently, makes it possible to avoid paste solidification and liquid leakage caused by residual pressure, and difficulty advancing an extrusion member. This paste syringe is equipped with a syringe main body, a nut member, a screw member, an extrusion member and a sealing member. The syringe main body has a main section which stores paste and has a cylindrical inner-circumferential surface. The nut member is provided to a base end section of the main section of the syringe main body, and has a cylindrical inner-circumferential surface which is concentric with the main section and has female threads formed therein. The screw member has a male screw section which has male threads provided to the cylindrical outer-circumferential surface thereof, and an operation part provided to the rear end of the male screw section. The screw member is advanced inside the main section of the syringe main body by threading the male screw into the female threads of the nut member and rotating in the advancing direction. The extrusion member is provided to the tip end of the screw member. The sealing member seals the discharge opening of the syringe main body by being tightly adhered to the tip end section of the syringe main body in a manner such that removal therefrom is possible. The extrusion member has a disc-shaped section which has an outer diameter which corresponds to the inner diameter of the main section of the syringe main body, a residual pressure-releasing space is provided to the rear of the disc-shaped section, and one or more through-holes which are connected to the residual pressure-releasing space are formed in the disc-shaped section.