Safe needle, placebo needle, and needle set for double-blinding

摘要

A safety needle and a placebo needle are provided for a double blind test. The placebo needle comprises a guide tube; a first stuffing in the guide tube to give resistance to a needle body during its passage therethrough; and a second stuffing in the guide tube at a lower position, to give resistance to the needle body during passage through the guide tube to a specified depth. The needle body is movably held by the first stuffing, and has a length sufficiently long to allow its point to stop just on or above the skin surface. A stopper is mounted to a needle handle or to the guide tube, and prevents the needle handle from advancing further.