High-Concentration AHA-Urea Formulations for Dry Skin and Keratosis Pilaris
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Solution Overview
Problem
Existing skincare compositions containing alpha hydroxy acids (AHAs) and urea cause skin irritation and sensitization, limiting their effectiveness in treating severe dermatological conditions like keratosis pilaris and very dry skin, as they are often diluted to avoid adverse reactions.
Innovation Solution
Formulations combining at least 10% AHA, such as glycolic acid, with 10% urea or urea derivatives, along with additional ingredients like peptides and ceramides, to enhance exfoliation and penetration while minimizing irritancy and sensitization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of AHA and urea are used to treat severe dermatological conditions, then treatment efficacy is improved, but skin irritation and sensitization increase
Solution Approach 1:
The patent introduces a buffering agent as an intermediary substance that moderates the interaction between AHA/urea and skin. The buffering agent neutralizes excess acidity and reduces hyper-osmolarity, allowing high concentrations of active ingredients to be applied without causing excessive irritation or sensitization, thus resolving the contradiction between treatment efficacy and skin compatibility
Solution Approach 2:
The patent changes the pH parameter by incorporating buffering agents that maintain the formulation within a specific pH range (e.g., pH 3.5-6.5). This parameter control allows high concentrations of AHA and urea to be used effectively while preventing excessive skin irritation, as the buffering action keeps the acidity at tolerable levels despite the high active ingredient content
2Object-affected harmful factors
If concentrations of acidic agents are reduced to avoid skin irritation, then skin compatibility is improved, but treatment potency decreases
Solution Approach 1:
The buffering agent acts as a mediator that allows high concentrations of AHA to be used without causing proportionally high irritation. By neutralizing excess acid, the buffering agent decouples the relationship between concentration and irritation, enabling potent treatment formulations that are still skin-compatible
Solution Approach 2:
The patent creates a composite formulation combining AHA, urea, and buffering agents in specific ratios. This composite approach allows the formulation to achieve both high treatment potency (through high AHA content) and low irritation (through buffering action), resolving the trade-off between these two properties
3Reliability
If high concentrations of urea are used for severe dry skin conditions, then exfoliation and rehydration effects are improved, but temporary sting due to hypo-osmolarity occurs
Solution Approach 1:
The patent changes the osmolarity parameter by incorporating buffering agents that alter the solution's tonicity. This parameter adjustment allows high concentrations of urea (which provide strong exfoliation and rehydration effects) to be used without causing excessive hypo-osmolarity that would lead to temporary stinging, thus maintaining both efficacy and comfort
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 combination provides improved exfoliation, penetration, and treatment efficacy for conditions like keratosis pilaris and very dry skin with reduced irritancy and sensitization, offering enhanced regression times and improved skin health.
Implementation Method 1
Alpha hydroxy acids, such as glycolic acid and lactic acid, are biologically active in skin treatment and penetrate the skin to provide exfoliation due to the acidic properties, and humectation, i.e., skin moisturizing, due to the high water binding capability
Implementation Method 2
In this, urea is used as a buffering agent, humectant, and skin-conditioning agent in cosmetic products
Implementation Method 3
Urea and urea derivatives also are used in skincare products as a rehydration agent through topical application to the skin. In addition to acting as a humectant, urea provides skin protection and exfoliation to the skin
Data Source
AI summary
Disclosed are effective, non-irritating, skincare formulations containing an alpha hydroxy acid and urea or a urea derivative for topical application to the skin. The disclosed topical formulations provide enhanced penetration of the active ingredients to the skin for the treatment of amenable skin conditions, such as very dry skin and keratosis pilaris, as well as for improvement of aesthetic skin properties. Also provided are methods for therapeutic treatment of dermatological conditions by topically applying a formulation comprising (% w/w) at least 10% alpha hydroxy acid and at least 10% urea. The formulations may be cream emulsions, spray-ons, among other delivery systems.