Needle shield converting to a needleless needle

Abstract

A needle assembly withdraws medicine from a vial having a rubber septum and injects the medicine into a port in a patient while not endangering the caregiver with an accidental stick with a contaminated used needle. The needle assembly includes a sharp hollow needle for penetrating a septum of a vial and a blunt cannula for injecting into an injection port. The needle can be of any type including intramuscular. The blunt cannula concentrically surrounding the sharp hollow needle, forms a liquid-tight seal with the sharp hollow needle, and extends relative to the sharp hollow needle in a locked position.

Dependencies are inferred from the claim text.