A needle guard having a housing defining an interior cavity, and a transitional member disposed within the interior cavity is disclosed. The transitional member includes a pivoting arm having a first end and a second end, the first end adjacent an interior portion of the housing. The transitional member also includes a needle tip sensing element, and a transverse barrier, such that the needle tip sensing element and the transverse barrier are oriented on opposing sides of the pivoting arm adjacent the second end. The needle guard may be adapted for transition from a restrained position when the needle tip is exterior to the interior cavity, to an activated position when the needle tip is within the interior cavity. The transitional member may also have a needle tip sensing element for contacting a needle in the restrained position, and a binding edge for engaging the needle in the activated position.
