形成脊的突起(56)设在注射筒顶部和柱塞头中的一个上。
A protrusion (56) forming a ridge is disposed on one of the roof of the barrel and the plunger head.
当笔式胰岛素注射器笔芯内柱塞推注到终止时，凸型柱塞与笔芯瓶顶部相吻合，充满整个空间。
When injection of an inner plunger of the refill of the pen insulin syringe stops, the convex plunger is tallied with the top of a refill bottle and fills the whole space.
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