Capsaicin Transdermal Patch Microreservoir Matrix
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Solution Overview
Problem
Conventional topical capsaicin preparations fail to achieve optimal concentration in nerve fibers for effective neuropathic pain relief due to insufficient release of capsaicin, leading to suboptimal pain alleviation.
Innovation Solution
A microreservoir system comprising a polysiloxane-based self-adhesive matrix with liquid microreservoirs containing capsaicin or capsaicin analog dissolved in an amphiphilic solvent, such as diethylene glycol monoethyl ether, at concentrations between 20-90% by weight, ensuring the active compound remains dissolved and is released effectively for high-dose therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional topical capsaicin preparations are used, then the preparation is easy to apply, but the active compound concentration in nerve fibers remains below the effective concentration due to insufficient release
Solution Approach 1:
The capsaicin formulation is segmented into discrete microreservoir droplets dispersed throughout the matrix. Each microreservoir acts as an independent reservoir containing capsaicin dissolved in an amphiphilic solvent, enabling controlled release while maintaining high concentration potential. This segmentation allows the system to overcome the limitation of conventional preparations by providing sufficient capsaicin quantity without requiring complex manufacturing processes.
2Reliability
If high concentration capsaicin patches are used to achieve effective nerve fiber concentration, then pain relief effectiveness improves, but the device complexity increases due to the microreservoir system
Solution Approach 1:
The invention changes the physical-chemical parameters of the capsaicin delivery system by dissolving capsaicin in amphiphilic solvents within microreservoir droplets. This parameter change enables the formulation to achieve and maintain high capsaicin concentrations in nerve fibers, ensuring reliable pain relief effectiveness. The microreservoir structure, while adding complexity, provides a controlled environment that maintains these critical concentration parameters.
3Productivity
If capsaicin is dissolved in amphiphilic solvent in microreservoirs, then the active compound flux into skin increases significantly, but the manufacturing precision requirements increase
Solution Approach 1:
The matrix system incorporates microreservoir droplets that create a microstructured, porous-like dispersion throughout the formulation. This microstructure enables significantly increased capsaicin flux into the skin by providing numerous dispersed release sites. While this increases manufacturing precision requirements for achieving uniform droplet distribution, the resulting productivity gain in terms of capsaicin delivery efficiency is substantial.
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 microreservoir system achieves a significantly higher active compound flux into the skin, providing rapid and effective pain relief for neuropathic pain, with a one-hour treatment duration and lasting action for weeks, while maintaining patch stability and patient tolerability.
Implementation Method 1
liquid microreservoir droplets ('microreservoirs') containing capsaicin or a capsaicin analog dissolved in an amphiphilic solvent... the active compound (e.g., capsaicin) in the microreservoir droplets is dissolved at a concentration below the saturation concentration
Implementation Method 2
The microreservoir system achieves a significantly higher active compound flux into the skin... treatment of the affected body areas once or at most twice with a highly concentrated capsaicin preparation for a few hours eliminates or significantly alleviates the pain
Data Source
AI summary
The invention relates to a topical patch comprising a therapeutic compound-impermeable backing layer, a self-adhesive matrix based on polysiloxanes and containing capsaicin or a therapeutic compound analogous to capsaicin, and a protective film to be removed before use, in which the matrix contains liquid microreservoirs based on an amphiphilic solvent, in which the therapeutic compound is present in completely dissolved form and the concentration of the therapeutic compound in the microreservoir droplets is below the saturation concentration. The invention furthermore relates to a process for its production and its use in the treatment of neuropathic pain.