Microcomplex for Photoepilation with Plasmonic Nanoparticles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photoepilation methods using intense light struggle to effectively target clear hairs and often cause local skin injuries due to high light intensities, and existing nanocomplexes face limitations in reaching the hair follicle and may raise toxicity concerns.
Innovation Solution
A microcomplex comprising a nanoparticle adsorbed on a host microparticle with a diameter between 100-2000 nm, coated with a polycationic polymer, which interacts strongly with keratinized hair structures, enhancing heat delivery and absorption contrast, thereby improving photothermal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If isolated nanocomplexes are used to enhance absorption contrast, then photothermal efficiency is improved, but the amount of nanocomplexes reaching the hair follicle is limited and toxicity concerns arise
Solution Approach 1:
The patent embeds plasmonic nanocomplexes inside biocompatible microparticles (1-10 μm diameter) to create a nested structure. This allows the nanocomplexes to benefit from the microparticle's ability to reach the hair follicle while maintaining their photothermal properties, thus resolving the contradiction between photothermal efficiency and delivery efficiency/safety.
Solution Approach 2:
The biocompatible microparticle acts as an intermediary carrier that facilitates the delivery of nanocomplexes to the hair follicle. It mediates between the nanocomplexes (which have excellent photothermal properties but poor delivery and safety profiles) and the target tissue, enabling efficient and safe delivery.
2Illumination intensity
If high light intensities are used to target clear hairs, then absorption contrast is improved, but local skin injuries occur
Solution Approach 1:
The patent introduces microparticles with specific surface properties (negative zeta potential, hydrophilic coating) that enable selective accumulation at the hair follicle site. This creates local concentration of photothermal agents exactly where needed, allowing lower overall light intensities to achieve the same effect without skin injury.
Solution Approach 2:
The patent changes the physical state and distribution parameters of the photothermal agents by encapsulating nanocomplexes in microparticles. This alters their biodistribution, accumulation kinetics, and local concentration, enabling effective treatment at lower light intensities and reducing skin injury risk.
3Quantity of substance
If larger host microparticles are used to increase nanoparticle loading, then heat delivery capacity is improved, but heating efficiency decreases due to reduced nanoparticle proximity to hair surface
Solution Approach 1:
The patent optimizes the microparticle size to a specific range (1-10 μm) that balances two dynamic requirements: large enough to carry sufficient nanoparticle load but small enough to maintain close proximity to the hair follicle surface. This dynamic optimization ensures both high loading capacity and efficient heat transfer.
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 microcomplexes achieve enhanced heating efficiency and increased accumulation at hair follicles, leading to improved photoepilation efficacy with reduced energy requirements and minimized skin damage compared to isolated nanocomplexes.
Implementation Method 1
The plasmonic nanoparticles keep their resonant properties when attached to a solid support although the position of the resonance may slightly red shift because of the higher refractive index of the support.
Implementation Method 2
The microcomplexes of the invention, due to their positive surface potential, show a strong interaction with the keratinized structures, for example hair cuticle or hair follicle cells responsible of the hair growth, because they all have global negative charge.
Implementation Method 3
The heating efficiency of the microcomplexes of the invention over the nanocomplexes is substantially increased.
Data Source
AI summary
The present invention relates to a microcomplex containing a modified nanoparticle adsorbed on a host microparticle and to a process to obtain it. The microcomplex is particularly useful for photoepilation. The present invention also relates to a composition containing the microcomplex and to the method for enhanced photoepilation based on the microcomplexes.