Syringe needle sheath

A syringe comprising a barrel, a needle and a needle mount fitted to the barrel to prevent movement of the needle and needle mount relative to the barrel, a plunger, a needle sheath slidably located within the barrel, an initially compressed spring and a sheath seal that comprises an aperture, wherein said needle mount comprises an elongated boss fitted into said aperture to thereby couple the sheath seal and the needle mount, wherein an end of said needle is supported by and extends through the entirety of said elongate boss such that the end of said needle terminates at an end of said elongated boss in fluid communication with a fluid space in said barrel, arranged so that depression of said plunger urges said sheath seal to bear against said needle sheath and thereby release said needle sheath from said needle mount to facilitate decompression of said spring and thereby move said needle sheath to cover or at least partly enclose the needle after expelling fluid contents from the syringe.