Wound Dressing pH Indicators With Stable Moisture Loading Signals
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Solution Overview
Problem
Existing pH measurement technologies, such as pH meters and disposable test strips, are impractical for real-time, reversible, and stable pH detection due to calibration requirements, fragility, and limited sensitivity, while wound dressings lack accurate and sensitive indicators for pH and moisture levels, disrupting healing processes.
Innovation Solution
Development of pH indicator devices and formulations using covalently immobilized phenylazo compounds that change color in response to pH changes, integrated with conduits to direct fluid or exudate, and moisture indicators that visually signal saturation without disrupting the wound environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pH meters are used for pH measurement, then measurement precision is improved, but device complexity and ease of operation deteriorate due to calibration requirements and fragility
Solution Approach 1:
The patent employs disposable pH test strips with covalently immobilized phenylazo compound indicators that change color in response to pH changes. These single-use strips eliminate the need for calibration and maintenance associated with reusable pH meters, while providing sufficient measurement precision for wound monitoring applications through visual color comparison against a pH scale.
Solution Approach 2:
The patent utilizes phenylazo compound pH indicators that exhibit distinct color changes across different pH values. The indicators are covalently bound to the test strip substrate, enabling visual detection of pH changes in wound exudate through colorimetric response, thereby simplifying the measurement process while maintaining adequate precision for clinical decision-making.
2Ease of operation
If disposable pH test strips are used, then ease of operation is improved, but measurement precision and reliability deteriorate due to permanent color change and inability to demonstrate pH changes over time
Solution Approach 1:
The patent employs reversible pH indicators that can dynamically respond to pH changes in the wound environment. The phenylazo compounds exhibit reversible color changes that allow continuous monitoring of pH fluctuations over time, enabling clinicians to track wound healing progress and detect infections early, thereby improving measurement precision while maintaining ease of operation through simple visual assessment.
3Ease of manufacture
If conventional wound dressings are used, then ease of manufacture is improved, but measurement precision deteriorates due to lack of accurate pH and moisture indicators
Solution Approach 1:
The patent integrates pH indicators, moisture indicators, and absorbent materials into a single wound dressing assembly. The pH-sensitive phenylazo compounds and moisture-responsive components are incorporated into the dressing structure, allowing simultaneous monitoring of both pH and moisture levels at the wound site. This combination maintains ease of manufacture through integration while significantly improving measurement precision for both parameters.
Solution Approach 2:
The patent incorporates both pH-sensitive and moisture-sensitive color indicators into the wound dressing. The pH indicator uses phenylazo compounds that change color with pH variations, while the moisture indicator changes color in response to moisture levels. These dual colorimetric systems provide accurate, simultaneous visualization of both pH and moisture conditions without complicating the manufacturing process.
4Ease of manufacture
If pH indicators are applied to surfaces, then ease of manufacture is improved, but reliability deteriorates due to washing away by fluid contact
Solution Approach 1:
The patent extracts the pH indicator molecules from their traditional applied state and instead covalently immobilizes phenylazo compounds directly onto the test strip or dressing substrate during manufacturing. This chemical bonding ensures the indicators remain firmly attached and cannot be washed away by wound exudate or fluid contact, thereby maintaining ease of manufacture through direct incorporation while significantly improving reliability and indicator stability during use.
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
Enables real-time, reversible pH detection with high sensitivity (0.1 pH unit intervals) and accurate moisture indication, reducing user subjectivity and tissue disruption, facilitating timely therapeutic interventions.
Implementation Method 1
a pH indicator which has a first colour prior to contact with the fluid and changes colour as a function of the pH of the fluid
Implementation Method 2
the pH indicator is covalently immobilised on or adjacent to the surface
Implementation Method 3
at least one conduit that is configured to direct fluid or exudate towards the pH indication zone
Data Source
AI summary
Disclosed herein are devices, wound dressings and methods for determining the pH of fluid or a wound exudate at a wound. Example devices include a device comprising a surface configured to contact the fluid or wound and a pH indicator covalently bound thereto or applied to the surface, wherein the pH indicator has a first colour prior to contact with the fluid or the wound exudate and changes colour as a function of the pH of the fluid or wound exudate. Example devices include a device which indicates wound exudate loading within a wound dressing and wound dressing comprising an absorbent layer and a moisture indicator which indicates would exudate loading within the dressing, wherein the visibility of the moisture indictor changes as a result of a physical transformation of a first material within the dressing. Systems, devices, and methods are provided for monitoring wound status and progression by measuring pH levels indicated by pH-sensitive wound dressings. In some implementations, a wound is monitored by capturing an image of the pH-sensitive wound dressing and processing the captured image to determine the color of a pH indicator included on the wound dressing. The color of the indicator is determined in terms of RGB values from the image, and a pH value for the wound dressing is calculated from the dressing RGB values. The calculated pH value is then relayed to a user to be used as an indicator of wound status or health.