Optical Sensor Module for Real-Time Pressure Monitoring in Surgical Retractors
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Solution Overview
Problem
Current surgical retraction methods cause tissue damage due to prolonged pressure on sensitive brain and nerve tissue, as existing pressure-measuring tools are bulky, complex, and unable to provide real-time, compact, and inexpensive measurements of pressure and vital signs.
Innovation Solution
Integration of an ultra-miniature optical sensor module within a surgical device that uses light sources and sensors to analyze reflected or transmitted light signals to estimate applied pressure, employing machine-learning algorithms for real-time pressure prediction and providing warnings when limits are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pneumatic, piezoelectric, capacitive, or strain gauge pressure-measuring systems are used, then pressure measurement capability is provided, but device size and complexity increase considerably
Solution Approach 1:
The patent replaces mechanical pressure sensing systems (pneumatic, piezoelectric, capacitive, strain gauge) with an optical measurement system. Optical sensors detect pressure indirectly through changes in light transmission or reflection properties caused by tissue compression, eliminating the need for complex mechanical transducers and reducing overall device complexity while maintaining measurement capability.
Solution Approach 2:
The patent introduces light as an intermediary to measure pressure. Instead of directly measuring mechanical pressure with complex transducers, the system uses optical sensors to detect changes in light properties (transmission, reflection) that occur when tissue is compressed, providing a simpler indirect measurement approach.
2Measurement precision
If conventional pressure-measuring tools are used, then pressure measurement is possible, but real-time monitoring capability is limited
Solution Approach 1:
The optical sensor system enables continuous real-time monitoring of pressure during surgical retraction. The optical sensors continuously detect light transmission or reflection changes as pressure varies, providing uninterrupted pressure data throughout the surgical procedure, unlike conventional tools that may have intermittent or delayed readings.
Solution Approach 2:
Optical measurement systems inherently provide faster response times compared to mechanical pressure transducers. The optical sensors can detect pressure changes through light property changes almost instantaneously, enabling real-time monitoring that responds immediately to pressure variations during tissue retraction.
3Adaptability or versatility
If multiple parameters (pressure, heart rate, blood oxygenation) are measured, then comprehensive monitoring is achieved, but device compactness is reduced
Solution Approach 1:
The optical sensor system is designed to measure multiple physiological parameters simultaneously using the same optical infrastructure. By using light at different wavelengths and detecting various optical properties (transmission, reflection), the system can extract information about pressure, heart rate, and blood oxygenation from a single integrated sensor unit, maintaining compactness while providing comprehensive monitoring.
Solution Approach 2:
The patent combines multiple measurement functions into a single integrated optical sensor unit. Instead of separate sensors for pressure, heart rate, and oxygenation, the system merges these capabilities into one compact device that uses optical detection to simultaneously monitor all parameters, thereby maintaining small size while achieving versatile monitoring.
4Force
If contact pressure is applied during PPG measurement, then tissue compression occurs, but signal quality deteriorates due to confounding factors
Solution Approach 1:
The system uses optical feedback to detect pressure changes and provide real-time information about the compression state. By continuously monitoring optical properties and comparing them against reference values or patterns, the system can detect when excessive pressure is applied and alert the surgeon, allowing for real-time adjustment to maintain signal quality while ensuring tissue 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 continuous, real-time monitoring of pressure and vital signs during surgical retraction, reducing tissue damage by providing timely warnings of excessive pressure, thus improving surgical safety and tissue viability.
Implementation Method 1
Photoplethysmography (PPG) is a technique that uses reflected or transmitted optical signals to provide physiological measurements of oxygenation and pulse rate.
Implementation Method 2
Reflected or transmitted light (at multiple wavelengths) is analysed in real time to provide a continuous estimate of applied pressure
Data Source
AI summary
A system and method simultaneously measure retraction pressure and oximetry during surgical procedures. The system involves an optical sensor module that is integrated within a retractor. Real-time optical data from the sensor module is analyzed, via machine learning or other algorithms, to determine the pressure applied between the retractor and tissue. This real-time continuous monitoring of pressure is coupled with simultaneous reporting of perfusion-related metrics at the site, providing warnings to surgeons when tissue viability is being compromised by prolonged reduction in perfusion due to retraction.