What type of container requires a filter needle for access?

An ampule is a sealed container that typically holds a single dose of a liquid medication and is designed to be broken open for access. The glass or plastic material of the ampule can create small particles or shards when broken, making it essential to use a filter needle to prevent these particles from entering the syringe.

Filter needles are specifically designed to trap any glass fragments or impurities during the drawing of the medication from an ampule, ensuring the sterility and safety of the compounded preparation. This is essential in sterile compounding, where the integrity of the medication is paramount, and potential contaminants can pose significant risks to patient safety.

In contrast, vials and multi-dose vials usually have closing mechanisms that allow for repeated access through a rubber stopper, which minimizes the risk of contamination and does not require a filter needle for safe withdrawal. Syringes, on the other hand, are devices used for dispensing medications and do not require a filter needle themselves unless drawing from an ampule.