Fiber Optic Sensor for Bilirubin Monitoring
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Solution Overview
Problem
Current methods for monitoring bilirubin levels in infants and theophylline levels in asthma patients are either invasive, lack accuracy, or have time lags, leading to potential irreversible consequences such as kernicterus and toxic effects.
Innovation Solution
A fiber optic sensor device with an unclad portion is used to transmit light energy of a specific wavelength into biological fluids, measuring the difference between the transmitted and reflected light to determine chromophoric compound concentrations, allowing for continuous, real-time monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If skin bilirubin readings are used for monitoring, then non-invasive measurement is achieved, but measurement accuracy and real-time monitoring capability deteriorate
Solution Approach 1:
The patent uses an optical fiber as an intermediary medium to transmit light through the skin to measure bilirubin levels. The optical fiber enables indirect measurement by guiding light through tissue and detecting the reflected/absorbed light, thus achieving non-invasive measurement while maintaining accuracy comparable to blood tests.
Solution Approach 2:
The patent replaces mechanical/invasive blood sampling methods with an optical-based measurement system. By using light interaction with chromophoric compounds in tissue, the system eliminates the need for needle sticks while providing accurate real-time bilirubin monitoring.
2Measurement precision
If serum blood tests are used for bilirubin measurement, then measurement accuracy is improved, but invasiveness and time lag increase
Solution Approach 1:
The patent enables continuous monitoring of bilirubin levels by maintaining constant optical contact with the tissue through the optical fiber. This allows real-time measurement without repeated invasive blood draws, providing continuous data streams that reflect current bilirubin levels immediately.
Solution Approach 2:
The optical fiber serves as a mediator that allows repeated measurements without repeated skin penetration. Once the fiber is in place, it can continuously measure bilirubin levels through optical interaction with tissue, eliminating the need for repeated invasive procedures.
3Reliability
If theophylline infusion is increased to treat status asthmaticus, then therapeutic effect is improved, but toxic effects increase
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring theophylline levels in real-time and using this information to adjust infusion rates. When levels approach toxic thresholds, the system alerts clinicians to reduce infusion, preventing toxicity while maintaining therapeutic effectiveness through dynamic adjustment.
Solution Approach 2:
The patent enables preliminary detection of rising theophylline levels before toxicity occurs. By continuously monitoring and providing early warning of approaching toxic thresholds, the system allows preventive action to be taken before harmful effects manifest, balancing therapy with safety.
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, minimally invasive, and real-time measurement of bilirubin and theophylline levels, reducing the risk of adverse effects and improving treatment outcomes by providing early detection and precise monitoring.
Implementation Method 1
measuring means operatively associated with said fiber optic member and said light source, for measuring the difference between said light energy generated by said light source and light reflected from the distal end of the fiber optic member, wherein the difference is related to the light absorbed by the chromophoric compound
Data Source
AI summary
A fiber optic sensor device for detecting the presence of a chromophoric compound in a biological fluid is disclosed. The fiber optic sensor device includes at least one fiber optic member having an unclad portion, the fiber optic member having a proximal end and a distal end for transmitting light energy of a determinable wavelength, a light source means for generating light energy of determinable wavelength, said light source means operatively associated with a measuring means such that said light energy passes through said measuring means and said fiber optic member to the biological fluid, and measuring means operatively associated with said fiber optic member and said light source, for measuring the difference between said light energy generated by said light source and light reflected from the distal end of the fiber optic member, wherein the difference is related to the light absorbed by the chromophoric compound and indicative of the concentration of the chromophoric compound present in the biological fluid.


