What syringe accessory is specifically used with ampules?

The accessory specifically used with ampules is a filter. When preparing injections from ampules, it is essential to ensure that no glass particles or other contaminants enter the syringe. Since ampules are made of glass, cracking them open can sometimes produce small shards. The filter aims to catch these potential contaminants while allowing the liquid medication to be drawn into the syringe. This practice is critical for patient safety, ensuring that injections are free from foreign particles that could cause harm upon administration. The other options do not serve this specific purpose; a hub is typically associated with IV setups, a plunger is a standard component of syringes used for drawing up medication, and a barrel holds the medication but does not inherently offer any filtration capability.