The BD Uniject is a prefilled vaccine syringe that uses a plastic bulb instead of a plunger and has a disc valve to prevent reuse (Becton, Dickinson, and Company, 2005).
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So Becton Dickinson (BD) has recently come out with a variation on this safety: instead of a hinge, the device slides over the needle and fully covers the tip of the needle, so accidental needle-sticks do not occur (Becton, Dickinson, and Company, 2004, BD SafetyGlide).
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