Thickened Microemulsion for Transdermal Hormone Delivery
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Solution Overview
Problem
Conventional transdermal delivery systems for nonderivatized hormones face challenges such as poor solubility in water and oil, leading to inefficient absorption, liver stress, and variable hormone release profiles, which limits their effectiveness and bioavailability.
Innovation Solution
A thickened modified oil-in-water microemulsion composition is developed, comprising an alcohol-soluble species solubilized in a modified oil phase with a phospholipid, polyethylene glycol derivative, oil, and alcohol-lipid phase thickener, and a modified polar continuous phase with a continuous phase thickener and water, allowing for efficient transdermal delivery of nonderivatized hormones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nonderivatized hormones are delivered orally in solid or suspended form, then therapeutically effective bloodstream concentrations can be achieved, but significant liver stress occurs as the majority of hormones are digested and not beneficially transferred to the bloodstream
Solution Approach 1:
The patent uses an emulsion system as an intermediary carrier to deliver nonderivatized hormones. The emulsion consists of oil droplets containing the hormone dispersed in an aqueous phase, with surfactants stabilizing the interface. This intermediary structure protects the hormone from digestive enzymes while enabling transdermal absorption, thereby achieving bloodstream delivery without direct oral contact with liver-metabolizing pathways.
Solution Approach 2:
The patent changes the physical state and solubility parameters of the hormone by incorporating it into an emulsion system. The hormone is dissolved in the oil phase of the emulsion, fundamentally altering its delivery characteristics from oral solid/suspended form to a liquid emulsion form that can be applied topically and absorbed through the skin, bypassing hepatic first-pass metabolism.
2Object-affected harmful factors
If conventional transdermal creams and gels are used to bypass liver metabolism, then hormone delivery to bloodstream is improved, but absorption rates are slow, poor, and variable
Solution Approach 1:
The patent fundamentally changes the physical parameters of the transdermal delivery system by using a microemulsion formulation with specifically controlled droplet size (50-500 nm), oil phase composition, and surfactant ratios. These parameter changes enhance the thermodynamic stability and permeability of the system, enabling rapid and consistent transdermal absorption while maintaining liver metabolism bypass.
Solution Approach 2:
The patent employs a composite emulsion system combining multiple components: oil phase (containing the hormone), aqueous phase, surfactants (for interfacial stabilization), and co-surfactants. This composite material structure synergistically enhances transdermal penetration capabilities while maintaining stability, overcoming the limitations of conventional single-phase or simple emulsion creams and gels.
3Object-affected harmful factors
If nonderivatized hormones are delivered transdermally in conventional emulsions, then liver metabolism is bypassed, but the hormones may be altered by enzymes in the skin during transport
Solution Approach 1:
The emulsion oil phase acts as a protective intermediary medium that shields the nonderivatized hormone from skin enzymes during transport through the stratum corneum. The hormone remains dissolved within the oil droplets, physically isolated from aqueous enzymatic environments, thereby maintaining its structural integrity and biological activity while still enabling transdermal delivery and liver metabolism bypass.
4Quantity of substance
If transdermal creams are applied to the skin, then hormone delivery is achieved, but the preparation is transferred to clothing and other surfaces creating danger to other family members
Solution Approach 1:
The patent changes the rheological and physical adhesion parameters of the delivery system by using a microemulsion formulation with optimized viscosity and evaporation characteristics. The microemulsion dries more rapidly and adheres less to fabrics compared to conventional creams, reducing transfer to clothing and surfaces while maintaining effective hormone delivery to the skin. This parameter optimization reduces environmental contamination and exposure risks to family members.
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
This approach enables rapid, efficient, and therapeutically effective delivery of nonderivatized hormones to the bloodstream, achieving pulsed dosing regimens and reducing liver stress, with improved bioavailability and stability compared to conventional systems.
Implementation Method 1
an alcohol-soluble species solubilized in a modified oil phase
Implementation Method 2
A thickened modified oil-in-water microemulsion composition is developed
Implementation Method 3
enables rapid, efficient, and therapeutically effective delivery of nonderivatized hormones to the bloodstream
Data Source
AI summary
Thickened microemulsions are described where hydrophobic liquid droplets are distributed in a continuous hydrophilic liquid phase. In relation to conventional oil-in-water (OIW) microemulsions, the described thickened microemulsions may be thought of as modified oil-in-water (MOIW) microemulsions, where both the “oil” and “water” phases of the microemulsion are modified. The oil phase droplets of the thickened MOIW microemulsion are modified with alcohol and an alcohol-lipid phase thickener and can solubilize alcohol-soluble species, including nonderivatized hormones. Preferably, the modified oil phase droplets of the thickened MOIW microemulsion directly solubilize nonderivatized hormones. The polar continuous “water” phase of the thickened MOIW microemulsion is modified with a continuous phase thickener. The modified oil phase droplets disperse into the modified polar continuous phase of the thickened MOIW microemulsion.