Patent ID: 9067021
Filing Date: 2015-06-30
Classification: A61M

Abstract:
1. A needleless injector comprising: a piston shaft having at an outer surface a plurality of holder parts which are formed in a circular direction with a predetermined interval therebetween; a cylinder assembly penetrated therein through back and forth to accommodate and support the piston shaft so that the piston shaft is slidable back and forth; a plurality of balls accommodated in the cylinder assembly, disposed at a circumference of the piston shaft and provided to be movable at least in a radial direction, and being inserted into a plurality of the holder parts respectively if the piston shaft is retreated; a trigger button coupled to a rear end part of the cylinder assembly to be slidable back and forth, having a trigger end to block a plurality of the balls inserted in a plurality of the holder parts from moving in the radial direction, and releasing the blocking of the trigger end onto a plurality of the balls when sliding forward; first elastic pressing means pressing the piston shaft forward with respect to the cylinder assembly; and second elastic pressing means pressing the trigger button backward with respect to the cylinder assembly, wherein the cylinder assembly has a loading recess part at its outer surface, and the needleless injector further comprises a shaft loading lever which includes a pressing cylinder part inserted into the front end part of the cylinder assembly to press a front end of the piston shaft, a lever part having an operating end part at a side part and a handle part at another side part together with a hinge rotatably coupled to an end part of the pressing cylinder therebetween, a link part rotatably coupled to the operating end part at one end part, and a holder part rotatably coupled to another end part of the link part and provided to be hung by the loading recess part.