Microneedle Unit Adhesive Region Segmentation for Peeling
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Solution Overview
Problem
Existing microneedle technologies face challenges in easy and efficient peeling of protective sheets, leading to potential damage and reduced functionality due to excessive force required for removal.
Innovation Solution
A microneedle unit configuration with an adhesive sheet having an exposed region and a protective sheet that covers part of the adhesive region, allowing for easy peeling by providing a starting point near the exposed region, thereby reducing the force needed and preventing adhesive sheet deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective sheet is used to cover the adhesive region, then the microneedle is protected from damage, but excessive force is required to peel off the protective sheet
Solution Approach 1:
The adhesive sheet is divided into two functional regions: a sticking region attached to the substrate and an adhesive region protruding outside the substrate. The protective sheet covers only the adhesive region, creating a segmented protection scheme that allows easy peeling from the exposed adhesive region while maintaining protection where needed.
Solution Approach 2:
The exposed adhesive region acts as an intermediary element that facilitates the peeling process. By providing a non-adhesive exposed portion of the adhesive sheet, users can easily grip and peel the protective sheet without directly touching or damaging the microneedle projections.
2Reliability
If the protective sheet covers the entire adhesive sheet, then complete protection is achieved, but the peeling process becomes difficult and may damage the microneedle
Solution Approach 1:
The protective sheet is designed to cover only specific portions of the adhesive sheet (the adhesive region) while leaving other portions (the exposed adhesive region) uncovered. This local quality approach provides protection where adhesive exposure is not needed while facilitating easy peeling where the exposed region is located.
Solution Approach 2:
The adhesive sheet is pre-configured with an exposed adhesive region that serves as a predetermined peeling initiation point. This preliminary design allows users to easily start peeling the protective sheet from the exposed region without needing to search for or create a peeling point, reducing the risk of microneedle damage.
3Reliability
If no exposed adhesive region is provided, then the adhesive sheet maintains full adhesive coverage, but there is no easy starting point for peeling the protective sheet
Solution Approach 1:
The adhesive sheet is segmented into a sticking region that maintains full adhesive coverage for substrate attachment and an adhesive region with an exposed portion that provides a peeling initiation point. This segmentation allows the system to maintain full adhesive functionality while enabling easy protective sheet removal.
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
Facilitates easy and safe peeling of the protective sheet without damaging the microneedle, maintaining its functionality and allowing for efficient skin application.
Implementation Method 1
an adhesive sheet including a sticking region attached to the second surface
Data Source
AI summary
A microneedle unit including a microneedle including a substrate having a first surface and a second surface opposite to the first surface, the microneedle further including a projection protruding from the first surface of the substrate, an adhesive sheet including a sticking region attached to the second surface, the adhesive sheet further including an adhesive region protruding outside the substrate from the sticking region in a direction parallel to the second surface, and a protective sheet covering a portion of the adhesive region outside of the substrate in the direction parallel to the second surface.