Microneedle Sheet Tip Formation with Two-Stage Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing microneedles often result in rounded or chipped tip ends, which compromises the effectiveness of microneedle sheets for transdermal administration.
Innovation Solution
A two-stage cutting process is employed to form the tip ends of microneedles, where a first cut forms a preliminary outer edge, followed by a second cut to define the final tip end, using separate cutting dies for each stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single cut is made to form the tip end of the microneedle, then the production process is simple, but the tip end becomes rounded or chipped reducing puncturing capability
Solution Approach 1:
The single cut process is segmented into two separate cuts: a first cut that forms a preliminary outer edge and a second cut that defines the final sharp tip end. This segmentation allows each cut to be optimized independently, with the first cut removing bulk material and the second cut creating the precise sharp edge, thereby resolving the contradiction between process simplicity and tip sharpness.
Solution Approach 2:
The first cut is performed as a preliminary action to create a preliminary outer edge before the final second cut is made. This preliminary structuring prepares the microneedle tip for the final sharpening operation, enabling the formation of a sharp tip end while maintaining overall manufacturing efficiency.
2Manufacturing precision
If multiple cuts are made in two stages to form sharp tip ends, then the puncturing capability is improved, but the production process complexity increases
Solution Approach 1:
The cutting process is segmented into two distinct stages using separate cutting dies: the first cutting die performs the initial cut to form a preliminary edge, and the second cutting die performs the final cut to create the sharp tip end. This segmentation with specialized tools achieves high precision without requiring complex multi-component cutting mechanisms.
Solution Approach 2:
The first cut acts as an intermediary step that creates a preliminary outer edge, serving as a mediator between the raw sheet and the final sharp tip end. This intermediary structure enables the second cut to focus solely on refining the edge to a sharp point, simplifying the overall process by dividing the transformation into manageable stages.
Data Source
AI summary
A microneedle sheet includes: a sheet body having a main surface; one or more microneedles formed in the sheet body, each microneedle having a tip end; and an X-shaped cut formed in vicinity of the tip end of at least one microneedle among the one or more microneedles.