The Zero Residual™ Luer Lock cap allows the user to prefill the Zero Residual™ syringes air-free. The design, including threading, allows for a firm and proper seal, ensuring the closure-integrity of the prefilled syringe. This eliminates the risk that comes with flicking to remove air bubbles prior to injection.
Most ordinary caps do not allow air-free prefilling, admitting the risk of migrating air bubbles. When air bubbles migrate into the syringe after being prefilled and stored, they can lead to adverse situations when the syringe is being used at point of care.