本发明属医疗器械领域，涉及一种笔式胰岛素注射器常规胰岛素专用笔芯结构的改进。
The invention belongs to the field of medical apparatus, and relates to improvement of a general insulin special refill structure for a pen insulin syringe.
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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