Endoscope LED Power Control for Thermal Management
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Solution Overview
Problem
Current LED-based endoscope light systems face challenges in temperature management and intelligent adaptation to activity states, leading to inefficient power usage and operator discomfort due to excessive heat when idle or in low-light conditions.
Innovation Solution
A power control system for medical instruments that adjusts LED power based on activity state, using image sensors and temperature sensors to determine power mode, reducing power during inactivity and maintaining handle temperature below 40°C, and employing piezoelectric or accelerometer sensors to detect usage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If maximum LED power is used to ensure sufficient illumination, then illumination intensity is improved, but temperature of the instrument handle increases causing operator discomfort
Solution Approach 1:
The patent implements dynamic LED power adjustment based on detected activity state. The system transitions between different illumination modes (first illumination mode with higher power and second illumination mode with reduced power) depending on whether the instrument is actively being used or is idle, allowing the handle temperature to be controlled while maintaining illumination when needed
Solution Approach 2:
The system uses image sensors and motion sensors to detect the activity state of the instrument, providing feedback to the control system. Based on this feedback, the LED power is automatically adjusted - when no activity is detected for a predetermined period, the system reduces LED power to prevent overheating, and when activity is detected, it restores full illumination capability
2Temperature
If LED power is limited to control temperature, then temperature management is improved, but LED output capability is compromised during short periods of high demand
Solution Approach 1:
The system dynamically adjusts LED power based on temporal patterns of use. During idle periods, reduced power maintains acceptable temperatures. When activity is detected (through motion sensors or image sensor changes), the system quickly transitions to higher power output, allowing the LED to deliver full capability when actually needed rather than being permanently limited
3Illumination intensity
If LED power is set to maximum based on insufficient light detection, then illumination intensity is improved, but energy consumption increases during idle periods
Solution Approach 1:
The system uses image sensors to monitor the scene and detect changes in brightness or activity state. When the scene remains unchanged for a predetermined period, the system interprets this as an idle state and reduces LED power accordingly. When changes are detected indicating active use, the system restores full illumination power, optimizing energy consumption based on actual operational needs
Solution Approach 2:
The LED power is dynamically adjusted between high and low states based on detected activity. During idle periods when maximum illumination is not needed, power is reduced to conserve energy. When activity is detected, the system quickly transitions to maximum power output to provide sufficient illumination, avoiding continuous high power consumption
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 system effectively manages temperature and power usage, ensuring operator comfort and extending LED output capability by dynamically adjusting power based on activity and environmental conditions, thereby enhancing illumination efficiency and safety.
Implementation Method 1
The medical instrument may be configured to adapt to a state of activity by sensing a predetermined change of scene or brightness
Implementation Method 2
The medical instrument may be configured to sense a predetermined change of temperature and make a predetermined change in power to the light source based on the change in temperature
Implementation Method 3
employing piezoelectric or accelerometer sensors to detect usage changes
Data Source
AI summary
A medical instrument having a lighting system for illuminating a target area, the system comprising a light source and associated power controller, the system being configured to move from a first illumination mode to a second illumination mode based on a sensed or determined changed condition, such as predetermined temperature and/or change in a scene or brightness signal, or lack of change, from an image sensor that may be associated with the instrument.