Needle-free syringe and the injection procedure

Abstract

The present invention relates to a needle-free syringe which has a closer that can be released or otherwise opened such that a greater percentage, and preferably all of the desired dose of fluid vaccine or other active agent is injected at a substantially uniform velocity. The dose is delivered by applying sufficient pressure to the fluid, which is stored in a suitable container, to push it toward a pressure-releasable closure such that the desired dose or volume of fluid is ejected from the device to the appropriate layer of the body.

Dependencies are inferred from the claim text.