使用卡环锁的被动防止再度使用注射器

Passive reuse prevention syringe using retaining ring lock

Abstract

A syringe assembly includes a syringe barrel having an inside surface defining a chamber and an outlet. A plunger assembly is disposed within the syringe barrel and includes an elongate plunger rod having a distal end surface, a plunger head having a distal sealing surface and a proximal end surface having a continuous perimeter, and a breakable neck portion integrally connecting the plunger rod and the plunger head. A retaining ring lock is disposed on the inside surface of the barrel and defines an engagement surface about a perimeter of the chamber. The retaining ring lock is adapted to engage and retain the plunger head in a locked position within the chamber. The engagement surface of the retaining ring lock engages the continuous perimeter of the proximal end surface of the plunger head in a perimetrical engagement when the plunger head is in the locked position.
一种注射器组件,包括注射器筒管,该注射器筒管具有限定腔室的内表面以及出口。柱塞组件布置在注射器筒管内,并且包括长形柱塞杆、柱塞头以及易断颈部部分,该长形柱塞杆具有远侧端面,该柱塞头具有远侧密封表面和近侧端面,该近侧端面具有连续周界,该易断颈部部分一体地连接柱塞杆和柱塞头。卡环锁布置在筒管的内表面上,并且绕腔室的周界限定接合表面。卡环锁适于将柱塞头接合并且保持在腔室内的锁定位置中。当柱塞头在锁定位置中时,卡环锁的接合表面以周界接合方式而接合柱塞头的近侧端面的连续周界。

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