Nitric Oxide Skin Dressing pH Control
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Solution Overview
Problem
Existing topical nitric oxide delivery systems face challenges in maintaining a neutral pH during application, as they often require strong acids that can be harmful and may generate nitrogen dioxide instead of nitric oxide, lacking sufficient reducing power.
Innovation Solution
A skin dressing comprising a source of protons and a nitrite salt with a non-thiol reductant, which generates nitric oxide by increasing the pH from an acidic value to a more neutral value, utilizing a self-regulating mechanism to ensure efficient conversion of nitrite to nitric oxide while avoiding prolonged exposure to acidic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strong acids are used to generate nitric oxide from nitrite, then nitric oxide generation efficiency is improved, but harmful acidic exposure and nitrogen dioxide generation occur
Solution Approach 1:
The patent changes the pH parameter dynamically during the nitric oxide generation process. It uses a two-component system where Component 1 contains nitrite salt and Component 2 contains reducing agent and weak acid. When mixed, the pH naturally drops to activate nitric oxide generation, then gradually rises to neutral as the reaction proceeds, eliminating the need for prolonged strong acid exposure while maintaining high conversion efficiency
Solution Approach 2:
The patent introduces weak acid buffers (such as acetic acid, citric acid, or bicarbonate buffers) as intermediaries to mediate the pH change during nitric oxide generation. These weak acids provide the necessary acidic environment for nitrite reduction without causing the harmful effects of strong acids, and they buffer the pH transition to prevent extreme acidity while maintaining efficient nitric oxide production
2Productivity
If nitrite is converted to nitric oxide in acidic conditions, then conversion efficiency is improved, but nitrogen dioxide is generated instead of nitric oxide
Solution Approach 1:
The patent controls the pH parameter to change dynamically during the reaction. The pH initially drops to activate nitric oxide generation from nitrite, but as the reducing agent consumes the acid and the reaction progresses, the pH naturally rises toward neutral. This time-dependent pH control ensures nitric oxide is generated efficiently while preventing the conditions that lead to nitrogen dioxide formation
Solution Approach 2:
The patent employs a self-regulating chemical system where the reaction products themselves control the pH environment. The reducing agent (such as ascorbic acid, iodide, or hydroquinone) consumes protons during nitrite reduction, automatically raising the pH as the reaction progresses. This self-service mechanism eliminates the need for external pH control and prevents nitrogen dioxide generation without sacrificing conversion efficiency
3Duration of action of stationary object
If acidic buffer systems are used to maintain low pH, then nitric oxide generation is sustained, but skin irritation and harm occur
Solution Approach 1:
The patent uses a time-dependent pH change strategy where the pH is allowed to drop temporarily to initiate and sustain nitric oxide generation, but then naturally rises to neutral as the reaction completes. This dynamic parameter control provides sustained nitric oxide delivery during the critical treatment period while eliminating prolonged acidic exposure that causes skin irritation
Solution Approach 2:
The patent employs weak acid buffers as intermediaries that can provide temporary acidic conditions for nitric oxide generation without causing severe skin irritation. These weak buffers (such as acetate, citrate, or bicarbonate buffers) moderate the pH change, providing sufficient acidity for reaction activation while buffering against extreme pH values that would cause skin damage, thus enabling sustained yet safe nitric oxide delivery
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 skin dressing effectively releases nitric oxide while maintaining a mild pH environment, ensuring efficient conversion and avoiding the generation of nitrogen dioxide, thus providing therapeutic benefits like vasodilation and cell proliferation without the risks associated with acidic exposure.
Implementation Method 1
Nitric oxide can be produced by chemical reduction of nitrous acid. Many different reducing agents can be used to reduce nitrous acid, physiologically acceptable examples of such reducing agents include iodide anion, ascorbic acid, butylated hydroquinone, tocopherol etc.
Implementation Method 2
increasing the pH of the dressing in contact with the skin site from an acidic value to a more neutral value
Data Source
AI summary
A skin dressing is provided comprising a first component including a source of protons, a second component including a nitrite salt, the skin dressing further comprising a non-thiol reductant. The skin dressing is adapted, such that, when the first and second components are brought together and applied to a skin site the nitrite reacts to generate nitric oxide, increasing the pH of the dressing in contact with the skin site from an acidic value to a more neutral value.