A semiconductor light-emitting device includes a semiconductor light-emitting layer, a pair of electrodes, a fluorescent material layer and a chromaticity adjusting layer. The invention also relates to a needle assembly and to an injection device, each comprising such a shield. In one embodiment of the invention a flexible superstructure comprising the plurality of flexible veins extending longitudinally along the distal end of the catheter can be deformed to bow radially outward to engage surrounding tissue.