Resin Puncture Needle Channel Structure to Prevent Flow Blockage
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Solution Overview
Problem
Puncture needles made of resin can experience fluid passage blockage due to elastic deformation of the elastic body or the needle itself, particularly when dealing with thick or film-coated container lids.
Innovation Solution
A puncture needle design featuring a groove portion with a bottom surface and protrusions that form a channel between the bottom surface and the needle portion, ensuring a continuous fluid passage by integrating a channel that opens towards the outside of the intermediate portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional puncture needle is used to puncture an elastic body with large thickness or film coating, then the puncture needle may be blocked by elastic deformation of the elastic body or the needle itself, but the fluid passage can still be secured by increasing the needle diameter which increases structural complexity
Solution Approach 1:
The needle is divided into functionally distinct segments: a body portion with a central passage, an intermediate portion with groove portions forming channels, and a puncture portion. This segmentation allows each segment to perform its specific function - the body portion provides structural support and main fluid passage, while the groove portions in the intermediate portion create additional channels that prevent blockage without requiring the entire needle to be larger or more complex
Solution Approach 2:
The invention adds a radial dimension to the fluid passage system by forming groove portions that extend from the outer peripheral surface toward the central passage. This creates a multi-dimensional flow path where fluid can move not only axially through the central passage but also radially through the channels formed by the grooves, providing alternative pathways that prevent blockage while maintaining a compact needle diameter
2Reliability
If the needle diameter is increased to prevent blockage, then fluid passage security improves, but the ease of insertion into the elastic body deteriorates
Solution Approach 1:
The needle is divided into functionally distinct segments: a body portion with a central passage, an intermediate portion with groove portions forming channels, and a puncture portion. This segmentation allows each segment to perform its specific function - the body portion provides structural support and main fluid passage, while the groove portions in the intermediate portion create additional channels that prevent blockage without requiring the entire needle to be larger or more complex
Solution Approach 2:
The groove portions are strategically positioned in the intermediate portion of the needle, creating local channels that provide alternative fluid pathways only where needed. This localized approach ensures fluid passage security at the critical intermediate section without requiring an overall increase in needle diameter, thereby maintaining ease of insertion while preventing blockage
3Ease of manufacture
If a simple needle structure is used, then manufacturing ease improves, but the ability to maintain fluid passage under elastic deformation deteriorates
Solution Approach 1:
The groove portions are formed integrally with the needle body as a single molded piece, merging the manufacturing process into one step. This integral formation ensures that the grooves, channels, and central passage are perfectly aligned and sealed without requiring separate assembly operations, maintaining manufacturing simplicity while providing the complex multi-channel structure needed to prevent blockage under elastic deformation
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 a secure fluid passage by preventing blockage, allowing efficient collection and administration of liquids through the needle, even with thick or film-coated elastic bodies.
Implementation Method 1
A channel formed between the bottom surface and the pair of protrusions communicates with the passage of the body portion, and the channel is opened toward an outside of the intermediate portion
Data Source
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AI summary
A puncture needle (14) made of a resin material has a needle part (22) and a groove part (24). The needle part (22) integrally has a trunk part (32) having a path through which a fluid passes, a puncture part (34) provided on the distal end side of the trunk part (32) and having a needle tip at the most distal end, and an intermediate part (36) provided between the trunk part (32) and the puncture part (34). A pair of protruding parts (64) are provided integrally with the intermediate part (36) and are provided integrally with a bottom surface (62) extending from the trunk part (32) toward the puncture part (34), the pair of protruding parts extending from the trunk part (32) toward the puncture part (34) in a direction along an axis (C) of the needle part (22) and also protruding from the bottom surface (62) in a direction intersecting the axis (C) of the needle part (22). In the groove part (24), a channel formed between the bottom surface (62) and the pair of protruding parts (64) communicates with the path of the trunk part (32), and the channel is opened to the outside of the intermediate part (36).