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    • 7. 发明专利
    • Medical syringe
    • 医用注射器
    • JP2014128462A
    • 2014-07-10
    • JP2012288551
    • 2012-12-28
    • Daikyo Seiko Ltd株式会社大協精工
    • KAWAMURA HIDEAKI
    • A61M5/315A61M5/31
    • A61M5/31505A61M5/3135A61M5/315A61M5/31501A61M2005/3101A61M2005/5026
    • PROBLEM TO BE SOLVED: To provide a medical syringe in which a piston does not cause creep deformation even when the piston is charged inside an injection cylinder for a long period to prevent trouble such as reduction in sealing performance of the syringe, liquid medicine leakage or the like accompanying the creep deformation.SOLUTION: In a medical syringe 1, a cylinder body 21 is formed in a nearly cylindrical shape having a small inside diameter part 24 on the tip side, and having a large inside diameter part 25 on the rear end side. A piston 3 is made of a flexible material and is formed in a larger diameter than the inside diameter of the small inside diameter part 24 of the cylinder body 21, and a peripheral part of the piston 3 can be brought into pressure-contact with the inner circumferential face of the small inside diameter part 24 of the cylinder body 21 and is formed in the outside diameter equal to or less than the inside diameter of the large inside diameter part 25 of the cylinder body 21. A plunger rod 4 is held in the center of the cylinder body 21 in a state that the plunger rod 4 is inserted in a rod insertion part of a plunger rod holder 5, and the medical syringe 1 can hold the piston 3 in the large inside diameter part 25 of the cylinder body 21 in a loosely fitting state.
    • 要解决的问题:为了提供一种即使在长时间内将活塞装入注射缸内时也不会引起蠕变变形的医疗用注射器,以防止注射器的密封性能降低,药液泄漏或 伴随蠕变变形的情况。解决方案:在医疗用注射器1中,气缸体21形成为具有在前端侧的小内径部24的大致圆筒状,后端具有大的内径部25 侧。 活塞3由柔性材料制成,并且形成为比筒体21的小内径部24的内径大的直径,活塞3的周边部分可与压力接触 在缸体21的小内径部分24的内周面上形成的外径等于或小于缸体21的大内径部分25的内径。柱塞杆4保持在 柱塞杆4插入柱塞杆保持器5的杆插入部的状态下的筒体21的中心,医疗用注射器1能够将活塞3保持在筒体的大内径部25中 21处于松散配合的状态。