Injector

Abstract

The invention allows delivery of a substance to be injected to the depth of the intended skin structure in a live body without use of an injection needle. The injector is needle-free and is provided with an ignition device with ignition chemical comprising a fuel component and an oxidant component, a combustion chamber into which flows the combustion product produced by the reaction of the fuel component with the oxidant component in the combustion of the ignition chemical and in which is accommodated a gas-generating agent which is burned by said combustion product to generate a prescribed gas, and an enclosing part in which the substance to be injected is enclosed. The injector is configured so that pressure inside the combustion chamber pressurizes the substance to be injected, which is enclosed in the enclosing part. The fuel component and oxidant component contained in the ignition chemical are determined so that when mixed in a stoichiometric ratio and burned and the combustion product reaches room temperature, gaseous components have been eliminated from said combustion product. A cooling part, which is able to contact the combustion product generated by the combustion of the ignition chemical and which cools said combustion product, is disposed in the combustion chamber.

Description

technical field [0001] The present invention relates to a syringe (injector) with which an injection target substance is injected into an injection target region of a living body without using any injection needle. Background technique [0002] With regard to needle-free syringes (syringes without needles) utilized for injection without any injection needles, a structure is adopted in some cases so that injection is performed by applying pressure to a housing chamber containing an injection solution by pressurized gas or a spring. Or allow injection of injectable components. However, in the case of a needle-free injector having a conventionally known structure, the reproducibility in relation to the depth of injection solution and the injection volume is not satisfactory. Therefore, it is difficult to assert that such needle-free injectors are generally widely used. [0003] Therefore, a technique is disclosed in which the output pressure (injection pressure) of the inject...

AI Technical Summary

Problems solved by technology

For example, a description is found in Patent Document 6 that in order to reduce the noise generated when the injection solution is injected with pressurized gas, it is disadvantageous to increase the pressure applied to the injection solution after permeating the skin

Images