Microsyringe Needle Tip Protrusion for Brain Injection Accuracy
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Solution Overview
Problem
The existing microsyringe technology faces challenges in accurately injecting liquids into the brain due to radial spreading of the liquid when it comes into contact with the needle guide, making precise injection difficult.
Innovation Solution
A microsyringe unit design where the needle tip protrudes from the needle guide in a specific state, with a convex curved surface that decreases in diameter towards the tip, creating a gap with the brain tissue to prevent radial spreading, and a stylet is used to create space for the needle to enter accurately, ensuring the liquid is ejected accurately without contacting the guide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle tip is flush with or recessed into the needle guide tip, then the needle guide provides stable support and easy operation, but the liquid spreads radially when contacting the needle guide tip, reducing injection precision
Solution Approach 1:
The needle tip is designed with a convex curved surface having different radius of curvature than the needle guide tip, creating a localized geometric difference. This allows the needle tip to protrude slightly and form a liquid retention gap with the brain tissue, preventing radial spread while maintaining overall system stability and ease of operation.
2Measurement precision
If the needle tip protrudes from the needle guide, then liquid injection accuracy is improved by preventing radial spread, but the risk of tissue damage increases
Solution Approach 1:
The needle tip is designed with a convex curved surface with a specific radius of curvature that is larger than that of the needle guide tip. This parameter change creates a gentle curvature that prevents sharp edges from damaging tissue, while still allowing the tip to protrude and form a liquid retention gap for accurate injection.
3Measurement precision
If the needle tip has a sharp edge for precise injection, then injection accuracy is improved, but the risk of tissue damage and liquid radial spread increases
Solution Approach 1:
Both the needle tip and needle guide tip are designed with convex curved surfaces instead of sharp edges or flat surfaces. The needle tip has a larger radius of curvature than the needle guide tip, creating a gentle dome shape that prevents liquid radial spread while reducing tissue damage risk and maintaining injection precision.
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
This design enhances the accuracy of liquid injection by preventing radial spreading and ensuring the liquid is retained in the gap between the needle tip and brain tissue, allowing precise delivery to the target area without damaging the tissue.
Implementation Method 1
a gap is secured between the convex curved surface at the tip of the needle and a tissue of the brain, thereby enabling the liquid ejected from the tip of the needle to be retained in the gap to suppress the radial spread of the liquid
Implementation Method 2
the tip of the needle is hydrophilic, thereby enabling the wetness of the outer side surface of the tip to be lower than the wetness of the convex curved surface, the liquid ejected from the tip of the needle to be retained in the gap
Data Source
AI summary
Provided is a microsyringe unit capable of improving the accuracy of the injection position of liquid in a brain. The microsyringe unit of the present invention is composed of a microsyringe (100) and a needle guide (200). The microsyringe (100) includes a cylindrical needle (110), a plunger (120) that is passed through the needle (110), and a needle base portion (130) that supports the needle (110). The needle base portion (130) abuts on a guide base portion (230) of the needle guide (200), thereby causing a part of the needle (110) to protrude from the tip of the needle guide (200) in a reference state in which forward movement of the needle (110) passed through the needle guide (200) is stopped.