Curved Biosensor Insertion Needle Aperture Flatness
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Solution Overview
Problem
Conventional insertion needles for biosensors often create apertures that are either too large or non-smooth, leading to delayed healing and discomfort during implantation under the skin, which affects the accuracy and immediacy of physiological parameter monitoring in diabetes and chronic illness management.
Innovation Solution
The design of an insertion needle with a needle sharp and a needle body, featuring a receiving space with curved side walls and slope sections, along with a reinforcing portion to prevent bending and deformation, enhances the smoothness of skin penetration and aperture formation, thereby improving healing and reducing discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional insertion needle is used to pierce the skin surface, then the biosensor can be implanted underneath the skin, but the aperture formed is either too large or non-smooth, causing delayed healing and discomfort
Solution Approach 1:
The patent applies curvature to the needle body by designing arc-shaped slope sections instead of straight edges. The first and second slope sections are both curved, creating a gradual transition from the needle sharp to the needle body. This curved geometry allows the needle to smoothly expand the aperture without creating sharp edges or burrs, thereby reducing piercing pain and improving aperture flatness for faster healing.
Solution Approach 2:
The patent implements local quality by creating different geometric characteristics at different locations of the needle. The needle sharp maintains sharpness for effective penetration, while the slope sections feature curved surfaces with controlled radii (R11 > R12) to ensure smooth aperture formation. The reinforcing portion is locally added to specific segments to prevent bending without affecting the overall insertion smoothness.
2Ease of manufacture
If the insertion needle structure is made simple, then the manufacturing is easier, but the needle sharp may bend or deform during the implanting process
Solution Approach 1:
The patent segments the needle body into distinct functional portions: the needle sharp for penetration, the slope sections for smooth transition, and the reinforcing portion for structural support. The reinforcing portion is specifically placed at segments where bending is most likely to occur during insertion. This segmentation allows the needle to maintain overall simplicity while providing targeted reinforcement exactly where needed.
Solution Approach 2:
The patent creates a composite structural design by combining different geometric features (sharp edge, curved surfaces, and reinforcing elements) into a single integrated needle structure. The reinforcing portion may involve different material properties or structural configurations (such as increased thickness or rib structures) that provide enhanced rigidity without significantly complicating the manufacturing process or affecting the smoothness of the insertion surfaces.
3Ease of operation
If the aperture formed is too large, then the biosensor can be easily inserted, but the wound cannot heal quickly and causes discomfort
Solution Approach 1:
The curved slope sections with controlled radii (R11 > R12) create a gradual expansion path for the aperture. This curvature allows the needle to smoothly push aside skin tissue rather than tearing it, forming an aperture that is just large enough for biosensor insertion while maintaining smooth edges. The rounded geometry prevents burr formation and ensures the aperture closes quickly after insertion, reducing healing time and discomfort.
Data Source
AI summary
An insertion needle structure includes a needle sharp and a needle body. The needle body is integrally connected to the needle sharp and has a receiving space for receiving a biosensor. The needle body includes a base wall, two side walls and two slope sections. The side wall has a first inner edge and a first outer edge. The first inner edge is near the receiving space, and the first outer edge faces away from the receiving space. The slope section is connected between the side wall and the needle sharp. The slope section has a second inner edge connected to the first inner edge, and a second outer edge connected to the first outer edge. The first inner edge, the second inner edge, the first outer edge and the second outer edge are curved. A condition of R11>R12 is satisfied.