Composite Needleless Injector Body for Igniter Pressure Strength
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Solution Overview
Problem
Needleless injectors using igniters for pressurization are compromised in user operability due to the need for high strength materials or large size to withstand pressure, which affects usability.
Innovation Solution
A needleless injector design incorporating a tubular metal reinforcing member embedded in a resin body, ensuring strength against igniter pressure while minimizing weight and size, using a combination of resin and metal materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high strength materials such as metal are used for the injector body to withstand pressure from the igniter, then strength and safety are improved, but weight and size increase, compromising user operability
Solution Approach 1:
The injector body is constructed as a composite structure combining a resin member with a metal reinforcing member. The resin member forms the main body providing lightweight structure, while the metal reinforcing member (tubular structure) is embedded within to provide localized strength against igniter pressure. This composite approach achieves the required strength without using solid metal throughout, thereby reducing overall weight and improving user operability.
2Strength
If the injector body is made large to accommodate stronger structural components, then strength and safety are improved, but device size increases, compromising user operability
Solution Approach 1:
The composite structure of resin member plus embedded metal reinforcing member allows achieving high strength with compact dimensions. The metal tubular reinforcing member provides high strength-to-volume ratio, enabling the injector body to withstand igniter pressure without requiring large overall size, thus maintaining good user operability.
3Strength
If solid metal structure is used throughout the injector body, then strength is improved, but weight increases significantly, affecting user operability
Solution Approach 1:
Instead of using solid metal throughout the entire injector body, the metal reinforcing member is strategically placed only in specific locations where strength is most needed - namely where the igniter is mounted and where pressure loads are concentrated. The resin member constitutes the majority of the body structure, providing sufficient strength where needed while keeping overall weight low for good user operability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design maintains sufficient strength and safety while reducing the size and weight of the injector, preserving user operability and lowering manufacturing costs.
Implementation Method 1
an igniter that is provided to the injector body, and configured to discharge, into a combustion chamber in the injector body, ejection energy for ejecting the injection substance through combustion of an ignition charge
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A needleless injector that ejects an injection substance to a target region without using an injection needle, the needleless injector includes: an injector body formed by a resin member; an igniter; a housing part in which the injection substance is accommodated; and a piston that is configured to be moved by ejection energy in a predetermined path, communicating with the combustion chamber, to pressurize the injection substance. A reinforcing member is provided inside the injector body, formed by a metal member to be a tubular member, and extends in an axial direction of the injector body while surrounding at least the igniter and the combustion chamber, the reinforcing member being disposed to be sandwiched between parts of the injector body in a radial direction of the injector body. With this configuration, sufficient strength of a needleless injector having an igniter as a pressurization source against pressure produced by the igniter can be guaranteed, and the user operability can be prevented from being compromised.