Polymer-Blend Microneedle Formulation for Penetration and API Stability
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Solution Overview
Problem
Soluble microneedles suffer from insufficient mechanical strength, leading to inadequate penetration depth and dosage inconsistency, and have low production efficiency due to harsh dehydration conditions affecting the quality and stability of the API.
Innovation Solution
A microneedle formulation comprising specific ratios of polyvinyl alcohol, polyvinylpyrrolidone, and hydroxyethyl cellulose, along with controlled dehydration at -40-35°C and use of a sealed bag with a dehydrating agent to achieve optimal water content, enhancing structural strength and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional soluble microneedle formulation is used, then production cost is low and biological stability is high, but mechanical strength is insufficient leading to inadequate penetration depth
Solution Approach 1:
The patent uses a composite formulation containing polyvinyl alcohol, polyvinylpyrrolidone, and hydroxyethyl cellulose to create microneedles with enhanced mechanical strength. This composite material approach allows the microneedles to achieve both sufficient penetration depth and cost-effectiveness by combining the advantages of each polymer component.
Solution Approach 2:
The patent optimizes the molecular weight and viscosity parameters of the polymer components to achieve the desired mechanical strength. By carefully controlling these parameters, the formulation achieves adequate penetration depth while maintaining cost-effectiveness and avoiding the need for expensive single-material solutions.
2Productivity
If harsh dehydration conditions are used, then dehydration efficiency is high, but API loses physical, chemical, and biological activities
Solution Approach 1:
The patent changes the dehydration parameters by conducting the process at reduced temperatures (30-60°C) and optimized humidity levels. This parameter optimization allows efficient dehydration while preserving API stability, avoiding the harmful effects of harsh high-temperature conditions.
Solution Approach 2:
The patent introduces a controlled dehydration environment with optimized temperature and humidity as intermediary conditions that mediate between the need for efficient water removal and the need to preserve API integrity. This controlled environment acts as a buffer that prevents direct exposure of API to harsh dehydration conditions.
3Manufacturing precision
If long dehydration duration is used, then dehydration completeness is high, but production efficiency decreases and API quality deteriorates
Solution Approach 1:
The patent optimizes the dehydration time and temperature parameters to achieve complete dehydration within a reduced time frame. By adjusting these parameters, the process achieves both dehydration completeness and improved production efficiency, avoiding the trade-off between time and quality.
4Length of moving object
If mechanical strength is insufficient, then production cost remains low, but penetration depth is inadequate affecting dosage consistency
Solution Approach 1:
The patent employs a composite polymer formulation that synergistically combines materials to achieve enhanced mechanical strength and penetration depth. This composite approach allows the microneedles to penetrate deeper into the skin while maintaining cost-effectiveness through the use of multiple polymer components rather than expensive single-material alternatives.
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 formulation and dehydration method improve the microneedles' mechanical strength, ensuring deeper skin penetration and consistent dosage delivery while increasing production efficiency and maintaining API stability.
Implementation Method 1
use of a sealed bag with a dehydrating agent to achieve optimal water content
Implementation Method 2
controlled dehydration at -40-35°C
Data Source
AI summary
A microneedle formulation is provided, which comprises polyvinyl alcohol, polyvinylpyrrolidone and hydroxyethyl cellulose. The polyvinyl alcohol comprises a first polyvinyl alcohol and a second polyvinyl alcohol, wherein the viscosity of the first polyvinyl alcohol is 2.4-12.3 mPas, and the viscosity of the second polyvinyl alcohol is 17.2-42.6 mPas; The polyvinylpyrrolidone comprises a first polyvinylpyrrolidone and a second polyvinylpyrrolidone, wherein the molecular weight of the first polyvinylpyrrolidone is 3500-150000, and the molecular weight of the second polyvinylpyrrolidone is 210000-1500000. The microneedle formulation can effectively improve the structural strength of microneedles. Meanwhile, the invention also provides a preparation method of the microneedle patch.