A cannulation assembly comprising: a housing； a needle selectively extendable from a proximal end of said housing； a tube arranged to pass through the housing and through a bore of said needle such that an insertion end of said tube is arranged to selectively project from an insertion end of said needle； a slide mounted to the needle in sliding engagement with the housing and arranged to move the needle from a retracted position to an insertion position such that the needle projects from said housing； wherein said slide is further arranged to move the needle from the insertion position to a locked position such that the needle is fully retracted.
