Needle Insertion Device with Spring Damping and Retention
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Solution Overview
Problem
Existing microneedle insertion devices face challenges in minimizing tissue stress during insertion and maintaining needle penetration to prevent leakage and ensure effective injection, as they often result in excessive pressure that can dislodge needles and hinder the formation of a wheal necessary for optimal substance diffusion.
Innovation Solution
A device with a piston and propulsion mechanism that allows high-speed needle insertion while damping the impact, using a combination of propulsion and pressure means to maintain needle penetration without excessive force, allowing for controlled recoil and minimizing tissue stress, and utilizing a retaining mechanism to ensure needle stability during injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed needle insertion is used, then penetration efficiency is improved, but tissue stress increases
Solution Approach 1:
The patent employs a spring mechanism that is pre-compressed before needle insertion. When the needle strikes the tissue at high speed, the spring absorbs the impact energy through compression, converting kinetic energy into elastic potential energy. This cushioning effect prevents excessive force transmission to the tissue, thereby maintaining high insertion speed while reducing tissue stress and pain.
2Reliability
If pressure means are applied to maintain needle penetration, then needle stability is improved, but tissue compression increases
Solution Approach 1:
The patent utilizes a dynamic spring mechanism that automatically adjusts its force output based on real-time conditions. After needle insertion, the spring maintains a controlled residual compression that exerts just enough pressure to keep the needle stable in the tissue without excessive compression. This dynamic adjustment allows the system to maintain needle reliability while minimizing tissue compression and enabling proper wheal formation.
3Reliability
If excessive pressure is applied during injection, then needle retention is improved, but wheal formation is hindered
Solution Approach 1:
The patent applies partial pressure through the spring mechanism - enough to maintain needle retention and prevent withdrawal, but deliberately not excessive. The spring is designed with specific elastic properties that provide just sufficient holding force to keep the needle in place during injection, while allowing the tissue to expand and form the necessary wheal for optimal substance diffusion. This balanced approach prevents both needle withdrawal and wheal formation inhibition.
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 device achieves efficient tissue penetration with reduced stress, maintains needle insertion, prevents leakage, and allows for the formation and maintenance of a wheal for optimal substance diffusion, ensuring effective intradermal injection.
Implementation Method 1
A spring, compressed between the means of propulsion and the housing, makes it possible to damp the impact
Implementation Method 2
a second spring, compressed between the piston and the distal end of the housing, exerting a force in a direction corresponding to the main orientation
Implementation Method 3
At least one means of pressure is arranged in the device, in particular two means of pressure, making it possible to damp the impact
Implementation Method 4
A spring, compressed between the means of propulsion and the housing, makes it possible to damp the impact
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
A device for inserting at least one hollow needle for the injection or withdrawal of a solution into/from a tissue, said device comprising a casing (1), a plunger (2) movably mounted inside the casing, and propulsion means (3 and 4) suitable for driving the plunger towards the distal end (1 a) of the device by applying a force F1(t). The propulsion means and/or the plunger comprise retaining means (3a) for joining the propulsion means and the plunger while the latter is moving, said retaining means releasing the plunger from the propulsion means when a force F2(t) is exerted in the opposite direction to F1(t). Pressure means hold the needle in the tissue and allow a controlled withdrawal of the plunger at least while the solution is being injected.