| 摘要 |
<p>A syringe in which liquid leakage can be prevented even if a gasket is subjected to high pressure is provided. The present invention includes a gasket 3 that freely slides inside a barrel 2, in which a lure tapered section 5 is formed, to seal it and has a cavity section 10 in an inner periphery side; and a plunger rod 4. The plunger rod 4 is coupled with the gasket 3 through an anchor section 11. The anchor section 11 is projected from a pedestal section 18 having a tapered surface inclined at 5 degrees to 45 degrees relative to a plane orthogonal to the axial direction of the plunger rod 4, has a head contact section 22 coming into contact with the backside of the head of the gasket 3, and has a contact member 12 that is loosely fitted on the outer periphery side and is in contact with the inner peripheral wall of the gasket 3. The pedestal section 18 has a curved recess surface 20 between the head contact section 22 and the tapered surface, and the contact member 12 has a curved projection section 28a at a position facing the curved recess surface 20. The barrel 2 has a lock tube 6 having a screw thread 7 formed on its inner periphery side. The syringe 1 is used for injection of a contrast agent.</p> |
