LED Heat Sink Electrical Conduction Thermal Dissipation
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Solution Overview
Problem
Current surgical lighting systems face challenges in effectively dissipating heat from LED light sources, leading to potential tissue damage and equipment failure, especially in confined surgical cavities where heat management is critical for prolonged and safe operations.
Innovation Solution
A compact surgical lighting system is designed with dual, electrically conductive heat sinks that are thermally connected to the LED, allowing for efficient heat dissipation while maintaining electrical isolation to prevent short-circuits, and optionally incorporating channels for active convection and fluid flow to enhance heat removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light source is placed close to the surgical target, then the need for extra light transmission components is eliminated, but heat generation is moved deeper into the wound making heat dissipation more critical
Solution Approach 1:
The harmful heat is extracted from the light source location and transferred to a separate heat sink component. The heat sink is thermally connected to the LED through a thermally conductive member, allowing heat to be removed from the surgical site while the light source remains close to the target.
Solution Approach 2:
A thermally conductive member acts as an intermediary between the LED and the heat sink. This intermediary component facilitates heat transfer from the light source to the heat dissipation structure, resolving the contradiction between close light source placement and heat management.
2Illumination intensity
If high intensity light is used for prolonged periods, then adequate illumination is achieved, but unacceptably high local temperatures may be attained causing tissue damage
Solution Approach 1:
The harmful heat generated by high-intensity LED operation is converted into a manageable thermal flow by directing it through a thermally conductive member to a heat sink. This allows the beneficial high-intensity illumination to continue while the harmful heat is routed to a safe dissipation location.
Solution Approach 2:
The heat management problem is solved by adding a spatial dimension - extending the thermal path from the LED through a thermally conductive member to a heat sink located in a different spatial zone, allowing heat dissipation away from the critical surgical area.
3Power
If LEDs are used for high power output, then adequate lighting is achieved, but heat removal becomes more important to prevent LED degradation and failure
Solution Approach 1:
Heat is extracted from the LED junction through a thermally conductive member and transferred to a heat sink. This extraction of thermal energy prevents temperature-induced degradation of the LED semiconductor, maintaining reliability at high power output levels.
4Temperature
If traditional heat sink designs are used, then heat dissipation is achieved, but the device size and complexity increase
Solution Approach 1:
The heat sink is merged with the electrical conduit structure, allowing the same component to serve dual functions: electrical connection to the LED and thermal dissipation. This integration eliminates the need for separate heat sink components, reducing device size and complexity.
Solution Approach 2:
The electrical conduit is designed to also function as a heat sink, creating a multi-functional component that performs both electrical conduction and thermal management, thereby reducing the overall number of components and device size.
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 minimizes heat buildup near the LED, ensuring prolonged LED performance, safety, and reduced risk of tissue damage, while also allowing for miniaturization and simplified assembly, thus providing reliable and efficient lighting in surgical environments.
Implementation Method 1
The at least one heat sink may dissipate heat away from the LED
Implementation Method 2
optionally incorporating channels for active convection and fluid flow to enhance heat removal
Data Source
AI summary
A lighting system includes a plurality of LEDs at least two heat sinks electrically connected to the LEDs, an insulator separating the heat sinks, a lens assembly provided opposite the heat sinks from the LEDs, and a power source. One of the heat sinks includes a recess, with the other of the heat sinks configured to be nested in the recess, such that the outer perimeters of both heat sinks align. The electrodes of the LEDs are connected to a corresponding one of the heat sinks, and forming a circuit with the power source.