PROBLEM TO BE SOLVED: To send a substance to be injected to the depth of a target skin structure of a living body without using an injection needle.SOLUTION: An injection syringe without an injection needle includes an enclosing part for enclosing a substance to be injected, an ignition device including an igniter that burns the igniter when an ignition current is passed, pressurizing part for applying pressure to the substance to be injected, and a flow channel part for defining a flow channel. The pressuring part increases the pressure to the substance to be injected up to a first peak pressure for the substance to be injected to penetrate the surface of an injection target region in a period within 2 msec. after the ignition current is passed to the ignition device, and then decreases it to a stand-by pressure.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】注射針を介することなく注射目的物質を目的とする生体の皮膚構造体の深さに送り込むことを可能とする。【解決手段】注射針の無い注射器であって、注射目的物質を封入する封入部と、点火薬を含み着火電流を流すことで該点火薬を燃焼する点火装置と、注射目的物質に対して加圧する加圧部と、流路を画定する流路部と、を備える。そして、加圧部は、点火装置に着火電流を流してから2msec以内の期間に、注射目的物質への圧力を、該注射目的物質が注射対象領域の表面を貫通するための第一ピーク圧力まで上昇させた後に待機圧力まで下降させる。【選択図】図4
