Abstract: A cannula and syringe assembly includes a syringe barrel having an opening at one end thereof defined by a forward edge; a needle carrier seated within the opening and attached to the syringe barrel; and a cannula attached to the needle carrier; wherein the cannula is provided with at least one engagement surface that engages the forward edge of the opening in the syringe barrel such that forces exerted on the cannula during use are transferred to the syringe barrel.

Abstract: A device for covering and protecting a syringe needle after a syringe procedure includes a needle guard component, a base member component and a spring. The needle guard and base member components of the device are both formed with cylindrical shaped portions that are arranged coaxially. The base member is affixable to the syringe with the spring positioned between the needle guard and base member components to urge the components in opposite axial directions. One component is formed with a plug that extends into a guide mechanism formed on the other component. The guide mechanism includes a locking cutout, an axially aligned linear track and a deflectable arm. The arm deflects to allow linear plug movement during retraction of the needle guard over the needle and redirects the plug to the locking cutout when the needle guard moves to re-cover the needle.