An arrangement comprising: a needle defining a longitudinal needle axis (A N) comprising a sharp distal tip, a shank portion, and a needle feature defining at least one localized area along the shank of increased outer diameter; a needle shield defining a longitudinal central axis (A C), the needle shield comprising a proximal end, a distal end, and a side wall connecting the proximal and distal ends, wherein the proximal end includes a proximal opening having a diameter great enough to permit passage of the needle shank therethrough, but small enough to prevent the needle feature from passing therethrough, and the distal end includes a distal opening having a diameter great enough to allow both the needle shank and needle feature to pass therethrough, wherein the needle is initially contained within the needle shield with the needle feature being positioned distally to the distal opening; and a biasing member adapted to exert a biasing force upon the needle in the state the needle extends through proximal opening and the distal opening of the needle shield such that when the needle is withdrawn proximally into the needle shield to the point that the sharp distal tip passes through the distal opening, the biasing force forces the sharp distal tip away from the distal opening such that the longitudinal central axis (A C) and the longitudinal needle axis diverge thereby preventing the sharp distal tip from moving distally back through the distal opening characterised in that the needle shield is constructed of metallic material and the biasing member is formed by the side wall of the needle shield and includes a finger-spring element, which is formed by cutting and folding the side-wall of the needle shield. a needle defining a longitudinal needle axis (A N) comprising a sharp distal tip, a shank portion, and a needle feature defining at least one localized area along the shank of increased outer diameter; a needle shield defining a longitudinal central axis (A C), the needle shield comprising a proximal end, a distal end, and a side wall connecting the proximal and distal ends, wherein the proximal end includes a proximal opening having a diameter great enough to permit passage of the needle shank therethrough, but small enough to prevent the needle feature from passing therethrough, and the distal end includes a distal opening having a diameter great enough to allow both the needle shank and needle feature to pass therethrough, wherein the needle is initially contained within the needle shield with the needle feature being positioned distally to the distal opening; and a biasing member adapted to exert a biasing force upon the needle in the state the needle extends through proximal opening and the distal opening of the needle shield such that when the needle is withdrawn proximally into the needle shield to the point that the sharp distal tip passes through the distal opening, the biasing force forces the sharp distal tip away from the distal opening such that the longitudinal central axis (A C) and the longitudinal needle axis diverge thereby preventing the sharp distal tip from moving distally back through the distal opening characterised in that the needle shield is constructed of metallic material and the biasing member is formed by the side wall of the needle shield and includes a finger-spring element, which is formed by cutting and folding the side-wall of the needle shield.