Patent attributes
A needleless injector configured to inject an injection intended substance to an injection target region, by injecting the injection intended substance includes a nozzle portion and a pressing portion, and a predetermined gap is formed between the nozzle portion and the pressing portion. The nozzle portion is formed to have a portion of the distal end portion that comes into contact with the injection target region and has a width (a) falling within a range from 3.5 mm to 5.5 mm, and a ratio (b/a) defined by an inner diameter (b) of a portion of a distal end portion of the pressing portion that comes into contact with the injection target region by the width (a) falls within a range from 1.5 to 5.0. A part of the injection target region is received in the predetermined gap when the pressing portion presses the injection target region.
