Insertion Needle Guide Structure for Stable Skin-Parallel Entry
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Solution Overview
Problem
Conventional insertion devices for biosensors often cause discomfort due to oblique insertion and retraction of the piercing assembly, leading to instability during the insertion process.
Innovation Solution
The insertion module includes a main body with slide grooves and an auxiliary insertion seat with wing portions that provide point-contact interference, stabilizing the insertion needle before insertion into the host, ensuring it moves parallel to the skin surface and preventing oblique movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the piercing assembly is inserted into the host using a conventional plunger mechanism, then the insertion operation can be completed, but the piercing assembly may be obliquely inserted and cause discomfort to the host
Solution Approach 1:
The insertion needle is pre-guided within the guide structure before insertion, ensuring proper alignment is established in advance. The guide structure with slide grooves and wing portions positions the needle correctly before the actual skin penetration occurs, preventing oblique insertion from the outset
Solution Approach 2:
The guide structure acts as an intermediary component between the piercing assembly and the host. It includes a main body with slide grooves and an auxiliary insertion seat with wing portions that provide point-contact interference, stabilizing the needle during the critical initial insertion phase
2Ease of operation
If the piercing assembly is retracted from the host, then the insertion device can be removed, but the piercing assembly may be obliquely retracted causing discomfort
Solution Approach 1:
The guide structure maintains its guiding function during retraction as well, ensuring the piercing assembly follows the same stable path in reverse. The structural constraints are continuously active throughout the retraction process, preventing oblique movement
Solution Approach 2:
The guide structure serves as a continuous intermediary during both insertion and retraction operations, providing stable guidance and constraint throughout the entire process, not just during initial insertion
3Device complexity
If the insertion needle is allowed to move freely during initial stroke, then the insertion device is simpler in structure, but the needle may move obliquely and cause instability
Solution Approach 1:
The guide structure is divided into functional segments: a main body with slide grooves for lateral constraint, and an auxiliary insertion seat with wing portions for point-contact stabilization. This segmentation allows each component to perform its specific stabilizing function efficiently
Solution Approach 2:
The guide structure provides localized constraint where it is most needed - during the initial stroke distance. The wing portions with protruding portions provide point-contact interference specifically at the critical insertion zone, while allowing free movement elsewhere
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 stability of the insertion needle, reducing discomfort by maintaining parallelism during the initial stroke distance and ensuring steady insertion, thereby alleviating the drawbacks of prior art insertion devices.
Implementation Method 1
The protruding portion of each of the wing portions resiliently abuts against the wall surface of a respective one of the slide grooves in point-contact
Implementation Method 2
The protruding portion of each of the wing portions resiliently abuts against the wall surface of a respective one of the slide grooves in point-contact such that the auxiliary insertion seat is fixed before inserting into the host through the interference between the protruding portions and the wall surfaces
Data Source
AI summary
A insertion module includes a main body, an auxiliary insertion seat, an insertion needle assembly and a sensor assembly. The main body has a plurality of slide grooves. The auxiliary insertion seat has a base portion, and a plurality of wing portions. The insertion needle assembly is fixed through the interference between the wing portions and wall surfaces of the slide grooves, such that the insertion needle is prevented from being oblique to an insertion direction before the insertion needle is inserted into a host.