Nitric Oxide Dressing System Using Segmented Nitrite and Acid Layers
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Solution Overview
Problem
Existing skin dressing technologies for treating tissue ischemia and skin lesions, such as burns and diabetic foot ulcers, are inadequate in effectively generating nitric oxide (NO) while minimizing the production of nitrogen dioxide (NO2) by-products, which can be harmful.
Innovation Solution
A two-component dressing system comprising a layer containing nitrite and a layer with a source of hydrogen ions, where the components are kept separate until applied to the skin, allowing a heterogeneous reaction to produce NO with reduced NO2 production, utilizing materials like polypropylene meshes and hydrogels to facilitate NO diffusion and delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer dressing system is used to generate nitric oxide, then the structure is simple, but the production of harmful nitrogen dioxide by-products increases
Solution Approach 1:
The dressing system is divided into two separate layers: a first layer containing nitrite and a second layer containing acid. These layers are kept separate during storage and application, preventing premature reaction. When applied to the skin, the layers interact to generate nitric oxide while minimizing nitrogen dioxide by-products, thus resolving the contradiction between structural simplicity and harmful by-product reduction.
Solution Approach 2:
The patent introduces an intermediary approach by using two distinct layers that mediate the chemical reaction. The first layer (nitrite) and second layer (acid) act as intermediaries that control the reaction environment, ensuring nitric oxide is generated with minimal harmful nitrogen dioxide production while maintaining a simple overall dressing structure.
2Object-generated harmful factors
If nitrite and acid are kept separate in a two-layer system, then nitrogen dioxide production is reduced, but the device complexity increases
Solution Approach 1:
The dressing is segmented into two functional layers with distinct roles. The first layer contains nitrite and the second layer contains acid, allowing controlled interaction only when applied to the skin. This segmentation reduces nitrogen dioxide production while the layered structure itself provides a straightforward implementation that doesn't significantly increase overall device complexity.
3Object-affected harmful factors
If a barrier membrane is used to prevent direct contact of acid with skin, then skin safety is improved, but the device complexity increases
Solution Approach 1:
Instead of using a barrier membrane, the patent segments the acidic components into a separate second layer that is applied distal to the wound. This layer contains the acid in a controlled manner, allowing it to generate nitric oxide without directly contacting the skin or wound bed, thereby protecting skin safety while avoiding the complexity of barrier membranes.
Solution Approach 2:
The second layer acts as an intermediary carrier that delivers acid to the reaction site without direct skin contact. This intermediary approach ensures skin safety by preventing direct acid exposure while maintaining the necessary chemical reaction environment for nitric oxide generation.
4Productivity
If nitrite and acid are mixed in a single layer, then the reaction efficiency is high, but the production of harmful nitrogen dioxide increases
Solution Approach 1:
The patent segments the reactants into two separate layers that are applied in sequence. The first layer contains nitrite and the second layer contains acid. When applied to the skin, these layers interact to produce nitric oxide with high efficiency while the controlled environment minimizes nitrogen dioxide by-products, resolving the contradiction between reaction efficiency and harmful by-product reduction.
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 system effectively generates therapeutic levels of NO while minimizing NO2 production, enhancing wound healing and transdermal delivery of pharmaceutically active agents, with the ability to control NO release and improve patient compliance during procedures like venepuncture.
Implementation Method 1
a heterogeneous reaction system created by these separate layers in such a dressing system is advantageous since it results in a reduced amount of the NO2 by-product of the reaction to produce NO
Implementation Method 2
utilizing materials like polypropylene meshes and hydrogels to facilitate NO diffusion and delivery
Data Source
AI summary
The present invention relates to skin dressings that are useful in the treatment of conditions associated with tissue ischaemia and skin lesions including those that are infected, such as burns and surgical wounds and chronic wounds such as but not limited5 to diabetic foot ulcers and venous leg ulcers. The skin dressings are also useful to effect transdermal delivery of pharmaceutically active agents.