Intravaginal Ring with pH-Responsive Color Indicator
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Solution Overview
Problem
Current methods for monitoring adherence to intravaginal rings, used for HIV pre-exposure prophylaxis and other biomedical applications, rely on subjective patient reports, which are prone to errors and falsification, making it difficult to assess compliance and device efficacy accurately.
Innovation Solution
Incorporating indicator agents into intravaginal rings that respond to vaginal environmental stimuli, such as pH changes, to produce detectable changes, allowing for objective monitoring of ring usage and adherence through visual or quantitative measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If patient self-report methods are used to monitor adherence, then the monitoring process is simple and low-cost, but the accuracy and reliability of adherence data deteriorate due to subjectivity and potential falsification
Solution Approach 1:
The patent introduces an intermediary indicator agent that mediates between the vaginal environment and the observable signal. This agent objectively records environmental conditions (pH, enzymes, etc.) and transforms them into detectable visual changes, eliminating the need for subjective patient reporting while maintaining simplicity.
Solution Approach 2:
The patent replaces the mechanical/subjective system of patient self-reporting with a chemical/optical system involving indicator agents that automatically detect and signal environmental conditions through color changes or other detectable properties, providing objective measurement without complex equipment.
2Measurement precision
If indicator agents are incorporated into intravaginal rings, then objective monitoring of usage and adherence is enabled, but the device complexity increases
Solution Approach 1:
The patent merges the indicator agent functionality directly into the intravaginal ring structure itself, combining the drug delivery function with the monitoring function in a single integrated device, thereby enabling objective monitoring without significantly increasing overall device complexity.
Solution Approach 2:
The intravaginal ring is designed with multi-functionality, serving both as a drug delivery system and as a monitoring device through incorporated indicator agents that respond to vaginal environmental conditions, eliminating the need for separate monitoring equipment.
3Measurement precision
If visual indicator changes are used to indicate ring usage, then adherence monitoring becomes more accurate, but the detectability and interpretation of usage status may become more complex
Solution Approach 1:
The patent employs color changes as the primary visual indicator mechanism, where indicator agents undergo distinct color transformations in response to vaginal environmental conditions (pH changes, enzyme presence, etc.). These color changes provide intuitive, easily interpretable signals about ring usage status and adherence compliance.
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 accurate and objective assessment of intravaginal ring usage and adherence, reducing errors and providing reliable data on compliance, thereby ensuring the effectiveness of the device in delivering bioactive agents.
Implementation Method 1
an indicator agent which in interaction of said intravaginal ring with the vaginal environment produces a detectable change indicative of the interaction
Data Source
AI summary
The disclosure provides biomedical devices comprising indicator agents sensitive to the environment of use, methods of using same to enhance adherence to a treatment or usage regimen, and systems for monitoring compliance of use of the biomedical device. The biomedical device may be an intravaginal ring comprised of biocompatible polymeric material having indicator agent incorporated therein capable of producing a detectable change in response to a stimulus within the vaginal environment.