Needleless Injector Link Mechanism for Compact Reloading
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Solution Overview
Problem
Conventional needleless injectors have complex structures requiring many parts and high precision, leading to frequent malfunctions due to wear and tear, and separate link mechanisms for reloading are cumbersome.
Innovation Solution
A needleless injector design with a simple structure that integrates a loading lever, a towing member, a link, a spring, and an actuating head, allowing for reduced size and thickness, with a trigger mechanism that accommodates the components within a cylinder housing, enabling efficient reloading and injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ball and holder locking and unlocking mechanism is used to reload the piston rod, then the reloading function is achieved, but the structure becomes complex and requires many parts with high precision
Solution Approach 1:
The patent merges the reloading mechanism with the trigger mechanism by integrating the link mechanism into the existing structure. The link mechanism is combined with the trigger assembly, eliminating the need for separate reloading components. This integration reduces the total number of parts while maintaining the reloading function, directly resolving the contradiction between operational capability and structural complexity.
Solution Approach 2:
The link mechanism serves multiple functions: it acts as both a trigger component and a reloading mechanism. By making the link mechanism universal, it performs both triggering and reloading operations, reducing the need for dedicated separate mechanisms and thereby simplifying the overall structure while maintaining functionality.
2Ease of operation
If a separate link mechanism is provided for reloading, then the reloading function is achieved, but the device size increases and portability decreases
Solution Approach 1:
The link mechanism is nested within the existing trigger assembly structure. The link mechanism is positioned inside the trigger housing, utilizing the available space within the existing structure. This nesting approach allows the reloading mechanism to be accommodated without increasing the overall device volume, thereby maintaining portability while adding the reloading function.
3Ease of operation
If multiple parts are used in the locking and unlocking mechanism, then the reloading function is achieved, but the reliability decreases due to wear and tear from accumulated use
Solution Approach 1:
By merging the reloading mechanism with the trigger mechanism, the patent reduces the total number of moving parts that could potentially wear. The integrated design eliminates separate locking and unlocking components, reducing the surfaces that experience friction and wear during repeated use, thereby improving reliability while maintaining the reloading function.
4Device complexity
If a simple structure is used, then the device size is reduced, but the reloading function becomes difficult to implement
Solution Approach 1:
The link mechanism is designed to serve as a universal component that handles both triggering and reloading operations. By making this single mechanism multi-functional, the patent achieves a simple overall structure without compromising the reloading capability, as the same link mechanism that triggers the injection also enables the reloading function through its integration with the piston rod and spring system.
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 achieves a reduction in size and thickness while minimizing the risk of malfunction and improving portability by integrating the reloading lever and reducing the number of components, enhancing the reliability and usability of the injector.
Implementation Method 1
a spring inserted inside the inner cylinder
Implementation Method 2
a loading lever having a working arm part having a lever shaft, which is rotatably coupled to a rear end portion of the cylinder housing
Data Source
AI summary
A needleless injector is provided. The needleless injector includes a loading lever having a working arm part having a lever shaft, a towing member inserted inside the cylinder housing, a link having one end portion pin-coupled to the working arm part and the other end portion pin-coupled to the towing member, an inner cylinder inserted inside the cylinder housing, a spring inserted into the inner cylinder, an actuating head inserted into the inner cylinder in front of the spring and having a catching protrusion configured to be inserted into the slit, and a trigger means having a stopper head part configured to be able to be inserted into the slit of the inner cylinder and detached from the slit. Accordingly, the needleless injector can achieve a reduction in size and thickness by having a simple structure even with a lever for reloading integrally formed therein.