RETRACTABLE NEEDLE SYRINGE WITH UNITARY PROPELLANT RELEASE MODULE

摘要

A modular retractable needle assembly having a unitary propellant release structure is provided. The modular retractable needle assembly can be coupled to a suitable syringe. A modular filler needle can be provided that is engageable to the syringe. Kits comprising the modular retractable needle assembly, one or more syringes, and a modular filler needle are provided.