0.22 – 0.45 micron needle filter, Red filter needles

A filter needle is a medical device equipped with a built-in filter, typically a 5-micron filter, designed for drawing medication from glass ampules or other sources of potential particulate matter. It traps tiny particles, like glass shards or precipitates, preventing them from entering the syringe and subsequently being injected into the patient. The needle itself is too blunt for direct injection, so the medication is drawn up with the filter needle and then transferred to a standard injection needle before administration.

Not using filter needles or having them available for use can increase the risk of patient harm by glass particle contamination.

When preparing medications from glass ampules, use a filter needle to prevent glass shards from being drawn into the syringe. They are also used with some vials to filter out potential particulate matter, though their primary use is with ampules to prevent glass contamination. After drawing medication with the filter needle, it must be exchanged for a different needle before administering the injection to the patient.

The primary risks of using filter needles include potential delays in administering emergency medications, possible loss of vaccine effectiveness by filtering out active ingredients, and the risk of silicone oil contamination in some types of filter needles. Additionally, a filter needle is not for the final administration and must be replaced with a standard needle before injection to avoid tissue damage.

A filter needle is required for procedures that involve drawing medication from a glass ampule to prevent glass shards from being injected into the patient. It is also necessary for some specific liquid medications that require filtration during preparation or administration, as the filter can remove particulate matter, or as an extra precaution when dealing with certain powdered medications.