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

VSEngineering 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

Engineering Contradiction:
Improvenon-invasive measurementVSAvoidbilirubin level measurement accuracy
Core Design Contradiction:
Ease of operationVSMeasurement precision

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.

Inventive Principle:
Principle #24Intermediary (Mediator)

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.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If serum blood tests are used for bilirubin measurement, then measurement accuracy is improved, but invasiveness and time lag increase

Engineering Contradiction:
Improvebilirubin level measurement accuracyVSAvoidinvasiveness and response time
Core Design Contradiction:
Measurement precisionVSEase of operation

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.

Inventive Principle:
Principle #20Continuity of useful action

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.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Reliability

If theophylline infusion is increased to treat status asthmaticus, then therapeutic effect is improved, but toxic effects increase

Engineering Contradiction:
Improvetherapeutic effectivenessVSAvoidtheophylline toxicity
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

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.

Inventive Principle:
Principle #23Feedback

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.

Inventive Principle:
Principle #10Preliminary action

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

Methodology Applied
Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS7508999B2Fiber optic sensor device for measuring chromophoric compounds in biological fluid
Publication Date: 2009.03.24 JOHNS HOPKINS UNIVERSITY
  • US7508999B2 patent drawing
  • US7508999B2 patent drawing
  • US7508999B2 patent drawing

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.