Handheld Medical Device Light Source Power Management
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Solution Overview
Problem
Conventional medical devices used for visual observations, such as otoscopes and dermatoscopes, often have light sources that are left powered on after use, leading to unnecessary battery drain and heat generation, which reduces the bulb life, battery life, device readiness, and increases surface temperature.
Innovation Solution
The handheld medical device incorporates computing components and processors that determine the type of light source (e.g., LED or Halogen) and adjust voltage supply accordingly. It includes a timeout mechanism to disable the light source after a predetermined time if not adjusted by the user, thereby conserving battery life and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light source is left powered on after use, then the device is ready for immediate use, but battery life is reduced and heat generation increases
Solution Approach 1:
The device pre-charges the capacitor to a threshold voltage level before use. When the light source is activated, the capacitor immediately supplies the required inrush current, allowing the light source to be ready for immediate use without draining the battery excessively. This preliminary energy storage action resolves the contradiction by preparing the power delivery system in advance.
Solution Approach 2:
A capacitor is introduced as an intermediary component between the battery and the light source. The capacitor acts as a buffer that stores energy and provides high current pulses when needed, while the battery provides steady-state power. This intermediary resolves the contradiction by decoupling the high current demand of the light source from the battery, enabling immediate readiness without excessive battery drain.
2Reliability
If the light source is left powered on after use, then the device is ready for immediate use, but surface temperature increases
Solution Approach 1:
The capacitor is pre-charged to a threshold voltage before use, enabling it to immediately supply high current pulses when the light source is activated. This preliminary energy storage allows the device to be ready for immediate use without requiring the battery to continuously supply high current, thereby reducing heat generation and surface temperature.
Solution Approach 2:
The capacitor serves as an intermediary that buffers the high current demand between the light source and the battery. By handling the high current pulses, the capacitor prevents excessive heat generation in the battery and circuitry, thus maintaining lower surface temperature while ensuring immediate device readiness.
3Illumination intensity
If a high current is supplied to the light source, then the light output is sufficient, but the light source lifespan is reduced
Solution Approach 1:
The capacitor is pre-charged to a threshold voltage level, enabling it to immediately supply high current pulses when the light source is activated. This preliminary energy storage allows the light source to receive sufficient current for adequate light output without requiring the battery to continuously supply high current, thereby extending the light source lifespan through reduced thermal stress and electrical stress.
Solution Approach 2:
The capacitor acts as an intermediary that delivers high current pulses to the light source during activation, while the battery provides steady-state power. This separation of power delivery functions allows the light source to receive sufficient current for adequate illumination without continuous high current exposure, extending its operational lifespan while maintaining light output quality.
4Power
If the battery supplies high voltage to the light source, then the light source operates effectively, but unnecessary battery usage occurs when the device is not in use
Solution Approach 1:
The capacitor is continuously charged to a threshold voltage level from the battery, storing energy in advance. When the light source is activated, the capacitor immediately supplies the required high current pulses, while the battery only needs to maintain the capacitor's charge. This preliminary energy storage action eliminates unnecessary continuous battery usage while ensuring adequate power supply when needed.
Solution Approach 2:
The capacitor serves as an intermediary energy storage device between the battery and the light source. It accumulates energy during idle periods and releases it during active use, allowing the battery to operate at low power during standby while providing sufficient power during operation. This intermediary eliminates wasteful continuous battery discharge while maintaining effective light source operation.
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
This solution effectively conserves battery life, reduces heat generation, and prolongs the lifespan of the light source by intelligently managing power supply based on the type of light source and user activity.
Implementation Method 1
A medical device includes a power source, a capacitor coupled to the power source, a light scope... The capacitor is sized to supply a high current pulse to the light scope during activation of the light scope
Implementation Method 2
determining, based at least in part on the amount of current drawn, that the light scope includes a Halogen light scope or a light emitting diode (LED)
Data Source
AI summary
Systems and methods may determine an amount of current being drawn by a light source and determine, based on the amount of current, a type of light source. Based on the type of light source, an amount of time associated with disabling the light source may be determined. A voltage may be supplied to the light source for the amount of time.