Visual Electrophysiology Light Control for Accurate Stimulus Output
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Solution Overview
Problem
Existing visual electrophysiology devices lack improvements in stimulus generation, wavelength accuracy, luminance accuracy, and safety, leading to inconsistent and potentially hazardous light stimuli that affect the reliability of visual system function assessments.
Innovation Solution
The devices incorporate active thermal control systems to reduce temperature variability, and include features such as a light detector to detect light and a temperature sensor to detect temperature near the light detector, along with a control circuit to modulate light flashes based on real-time feedback, ensuring consistent and safe light stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active thermal control system is implemented to reduce temperature variability, then wavelength accuracy and luminance consistency are improved, but device complexity increases
Solution Approach 1:
The patent implements active thermal control by monitoring and adjusting the temperature of the light emitter to maintain it within a predetermined range. This parameter control ensures that the emitter's wavelength and luminance remain consistent, directly resolving the technical contradiction between measurement precision and device complexity through systematic parameter management.
2Reliability
If multiple independent circuits are used to limit time-averaged light, then safety is improved, but device complexity increases
Solution Approach 1:
The patent employs multiple independent circuits that preemptively limit the time-averaged light output to prevent retinal damage. This safety mechanism operates independently of the controller, providing a redundant protective layer that ensures patient safety even if other system components fail, thus resolving the contradiction between reliability and device complexity through preventive design.
3Measurement precision
If real-time feedback control is implemented to modulate light flashes, then luminance accuracy is improved, but device complexity increases
Solution Approach 1:
The patent incorporates a light detector that provides real-time feedback on the luminance output of the emitter. The controller uses this feedback information to dynamically adjust and modulate the light flash duration, ensuring precise luminance delivery. This closed-loop feedback system directly addresses the technical contradiction by maintaining high measurement precision through continuous monitoring and adjustment.
4Stability of the object's composition
If temperature monitoring and control is added near the emitter, then stimulus consistency is improved, but device complexity increases
Solution Approach 1:
The patent implements temperature monitoring and active control near the light emitter to maintain thermal stability. By keeping the emitter temperature within a predetermined range, the system ensures consistent wavelength and luminance output across multiple stimuli. This parameter stabilization approach resolves the contradiction between stimulus consistency and device complexity through systematic thermal management.
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
The solution provides improved consistency and safety in light stimuli, enhancing the accuracy and reliability of visual system function assessments by reducing temperature variability and potential hazards, thereby improving diagnostic outcomes.
Implementation Method 1
an emitter capable of emitting visible light
Implementation Method 2
an active thermal control system configured to reduce temperature variability near the emitter
Implementation Method 3
a light detector arranged to detect light from the emitter
Data Source
AI summary
Visual system function can be assessed using devices and methods that monitor the electrical response to a visual stimulus. Improvements in stimulus generation disclosed herein can be used separately or in combination, including improvements in wavelength accuracy, luminance accuracy, and safety. Improvements in wavelength accuracy may be accomplished by reducing the temperature range experienced by a light emitter that creates the visual stimulus. Improvements in luminance accuracy may be accomplished by reducing the temperature range experienced by the light emitter, reducing (or computationally correcting for) the temperature range experienced by a light detector used to calibrate the light output or to stop the light output after a target value is reached. Safety improvements include having an independent circuit to detect and limit the light output to levels below a target value.