Microneedle Skin Preparation for Low-Trauma Substance Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing skin preparation methods cause trauma leading to an inflammatory response, which impedes the diffusion of substances through the skin, making it difficult to measure or deliver substances effectively.
Innovation Solution
A device using microneedles with a specific geometry and orientation, featuring a rough apex and minimal penetration depth, minimizes skin trauma, creating pores for enhanced and prolonged diffusion of substances without an inflammatory response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If skin preparation methods cause trauma to create pores for substance diffusion, then diffusion capability is improved, but inflammatory response increases which impedes diffusion
Solution Approach 1:
The patent applies parameter changes by precisely controlling the physical dimensions and geometric parameters of microneedles (length, diameter, tip radius, orientation angles) to achieve optimal skin penetration that creates pores for substance diffusion while minimizing trauma-induced inflammatory response. The specific parameter ranges (e.g., needle length 50-500 μm, tip radius 1-10 μm) are optimized to balance pore formation capability with inflammatory response reduction.
Solution Approach 2:
The patent implements local quality by creating localized micro-pores through microneedle insertion at specific skin locations, rather than causing widespread skin trauma. The microneedles are designed to penetrate only the stratum corneum layer locally, creating discrete pores that allow substance diffusion without triggering a broad inflammatory response in the surrounding tissue.
2Quantity of substance
If microneedles penetrate deeper to create larger pores, then substance diffusion is enhanced, but skin trauma and inflammatory response increase
Solution Approach 1:
The patent applies partial action by using multiple microneedles (array configuration) with individual shallow penetration depths, rather than using fewer needles with deep penetration. The collective effect of many shallow penetrations creates sufficient total pore surface area for enhanced substance diffusion while each individual needle causes minimal trauma, preventing excessive inflammatory response.
Solution Approach 2:
The patent segments the pore-creation function across multiple microneedles in an array, where each needle creates a small pore. This segmentation allows the total pore surface area to be sufficient for enhanced substance diffusion while each individual penetration event causes minimal trauma, thereby reducing overall inflammatory response compared to fewer deep penetrations.
3Object-affected harmful factors
If skin trauma is minimized to prevent inflammation, then inflammatory response is reduced, but pore formation and diffusion capability decrease
Solution Approach 1:
The patent replaces the conventional mechanical approach of using sharp needles or abrasive methods for skin preparation with a controlled micromechanical system of blunt-tipped microneedles. This substitution allows for precise control of penetration depth and pore formation mechanism, creating sufficient pores for diffusion while minimizing traumatic injury and subsequent inflammatory response.
Solution Approach 2:
The patent employs composite microneedle structures combining materials with appropriate mechanical properties (rigidity for penetration, biocompatibility for minimal inflammation). The microneedles may be composed of biocompatible materials or coated with substances that further reduce inflammatory response while maintaining the ability to create effective diffusion pores.
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 device enables consistent and prolonged diffusion of substances through the skin, allowing for accurate and continuous measurement or delivery, while reducing skin trauma and inflammatory responses.
Implementation Method 1
The array of microneedles is pressed into skin to form pores in the skin by superficial ablation and/or abrasion
Implementation Method 2
The array of microneedles is pressed into skin to form pores in the skin by superficial ablation and/or abrasion
Implementation Method 3
the substance may be extracted from the interstitial fluid using techniques including using a needle to prick or cause micro-ablation or abrasion of regions of the skin surface
Data Source
AI summary
A skin preparation device (7) for preparing a region of skin (8) ready for delivering a therapeutic or cosmetic substance into the body of a subject through the skin or for measuring the concentration of a substance that is extracted from the region of skin, the device comprising an array of microneedles arranged to form artificial pores in the skin. The length and sharpness of the microneedles is limited to minimise trauma to the skin to minimise an inflammatory response. A plurality of micro-protrusions (5) may extend from an apex (1) of each microneedle or the tip of each microneedle may be bent to form a single, lateral micro-protrusion (6).