Prefilled Syringe Plunger Pathway for Stopper Interface Sterilization

The patent applies preliminary anti-action by designing a backstop mechanism that prevents excessive plunger movement before sterilization issues can occur. The backstop is positioned to limit the plunger's distal movement, ensuring that even under varying sterilization conditions, the plunger cannot move far enough to breach the sterile barrier or cause contamination. This preventive structural constraint resolves the contradiction by allowing necessary movement for sterilization access while preventing harmful excessive movement.

The patent applies universality by designing the plunger rod to serve multiple functions: it acts as both the actuating mechanism for the stopper and as the pathway conduit for the sterilizing agent. The hollow or lumen structure of the plunger rod allows sterilizing agent flow while maintaining its mechanical function, thereby achieving thorough sterilization without adding separate complex sterilization components. This multi-functional design resolves the contradiction by integrating the sterilization pathway into the existing plunger structure.

The patent applies segmentation by dividing the plunger's movement capabilities into distinct zones: the backstop allows controlled movement within a safe range to enable sterilization agent access, while preventing movement beyond the sterile barrier. This segmented approach to movement control resolves the contradiction by permitting necessary movement for sterilization while constraining excessive movement that would cause contamination.