Pre-filled Syringe Plunger Guide Rib Recess Leakage

The harmful capillary phenomenon is extracted and isolated by introducing a guide rib with a recess that creates a separate liquid barrier zone. The recess in the guide rib is positioned to face the clearance between the tubular container and plunger, effectively separating the discharge function from the leakage prevention function.

The guide rib acts as an intermediary structure between the plunger and the tubular container. The recess in the guide rib creates an intermediate liquid barrier that prevents direct capillary action through the clearance, mediating between the pushing action and the container wall to eliminate leakage while maintaining discharge efficiency.

The guide rib is segmented into distinct functional zones: the recess portion that faces the clearance to prevent leakage, and the rest of the guide rib structure that maintains structural integrity. This segmentation allows the simple gasket positioning to coexist with effective leakage prevention.

The guide rib introduces local quality changes by creating a recess only at the specific location facing the clearance between the tubular container and plunger. This localized modification prevents leakage at the critical interface without complicating the overall simple structure of the gasket positioning system.

The guide rib with recess merges multiple functions into a single component: it guides the plunger movement, creates the liquid barrier to prevent leakage, and maintains the structural relationship between the plunger and tubular container. This merging prevents leakage without proportionally increasing overall device complexity.

The guide rib serves multiple universal functions: it acts as a structural support element, a positioning guide for the plunger, and a leakage prevention mechanism through its recess. This multi-functionality justifies the added complexity by delivering multiple benefits from a single structural addition.