Proteoglycan Microneedle Array for Painless Skin Insertion
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Solution Overview
Problem
Existing external preparations face challenges such as removal due to sweating or washing, insufficient absorption through the skin barrier, and difficulty in using polymer compounds, necessitating a microneedle array with strength, fineness, flexibility, and biodegradability for effective pharmacological activity.
Innovation Solution
A microneedle array comprising proteoglycan as a base material, with specific dimensions and shapes, and a production method involving an aqueous solution of proteoglycan in a mold, allowing for insertion into the skin without pain or bleeding and subsequent biodegradation for effective drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional external preparations (solutions, ointments, creams, tapes, patches) are applied to the skin, then they can be easily applied, but they are removed or lost due to sweating, washing, and external pressure before medicinal components are absorbed
Solution Approach 1:
The preparation is segmented into discrete microneedles (each 10-1000 μm in length) arranged in an array, allowing individual penetration through the skin barrier while maintaining overall structural integrity for easy application. Each microneedle acts as an independent delivery unit that can penetrate and release medication, solving both the ease of application and retention problems.
Solution Approach 2:
The microneedles are designed with specific dimensional parameters (length 10-1000 μm, tip diameter 1-50 μm) and material properties that enable them to penetrate the stratum corneum effectively. The parameters are optimized so that microneedles are long enough to penetrate the barrier but short enough to dissolve completely, ensuring reliable medication delivery while maintaining ease of application.
2Object-affected harmful factors
If external preparations are applied to achieve percutaneous absorption, then they can be applied without pain, but the medicinal components are not absorbed to a sufficient degree due to the skin barrier function
Solution Approach 1:
The medication delivery system is segmented into multiple fine microneedles rather than a single large applicator. This segmentation allows painless penetration (each needle is too fine to cause significant pain) while collectively achieving sufficient medication absorption through multiple penetration points across the skin surface.
Solution Approach 2:
The microneedles utilize capillary action (a hydraulic principle) to draw medication from the base into the needle tips and subsequently into the skin. This passive fluid transport mechanism eliminates the need for painful pressure application while ensuring efficient percutaneous absorption of medicinal components.
3Duration of action of moving object
If polymer compounds are used as medicinal components in external preparations, then they can provide sustained release, but percutaneous absorption is difficult and desired pharmacological activity is not achieved
Solution Approach 1:
Polymer compounds are incorporated into individual microneedles rather than being applied as bulk preparations. This segmentation allows the polymers to be delivered directly through the skin barrier in controlled amounts, achieving both sustained release (from the polymer matrix) and effective percutaneous absorption (through direct needle delivery).
Solution Approach 2:
The microneedles are constructed as composite materials combining polymer compounds with biodegradable matrix materials. This composite structure enables the polymers to provide sustained release functionality while the biodegradable matrix ensures the microneedles can penetrate the skin and dissolve, achieving effective percutaneous absorption of the polymer-containing medication.
4Object-affected harmful factors
If microneedles are made very fine to cause no pain or bleeding, then they are gentle on skin, but they lack the strength to withstand insertion into the skin surface layer and stratum corneum
Solution Approach 1:
The microneedles are designed with optimized dimensional parameters where the length (10-1000 μm) and tip diameter (1-50 μm) are carefully balanced. The needles are long and thin enough to be gentle and painless, yet the material composition and structural design provide sufficient strength to penetrate the stratum corneum. The parameters are chosen so that the needle strength is adequate for insertion but the overall structure remains fine and gentle on the skin.
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 proteoglycan-based microneedle array provides effective delivery of proteoglycan under the skin, enhancing pharmacological activity and cosmetic benefits like wrinkle smoothing, while maintaining strength and solubility for medical and cosmetic applications.
Implementation Method 1
the microneedles are inserted into the skin surface layer and/or stratum corneum to supply the medicinal components contained in the microneedles under the skin. The inserted portions of the microneedles can dissolve or biodegrade under the skin and thus disappear.
Implementation Method 2
the microneedles are inserted into the skin surface layer and/or stratum corneum to supply the medicinal components contained in the microneedles under the skin
Data Source
AI summary
A microneedle array is provided which has (1) the strength to withstand insertion into the skin surface layer and/or stratum corneum, (2) the fineness and flexibility to cause no pain or bleeding in the skin surface layer and/or stratum corneum at the insertion site of the microneedles, and (3) solubility or biodegradability of the microneedle portions under the skin. The microneedle array is produced by forming microneedles using proteoglycan as a base material.