Infrared LED Lamp Spectrum Shaping for On-Skin Hyperthermia
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Solution Overview
Problem
Traditional water-filtered halogen lamps for radiotherapy are bulky, consume high power, and require large distances for safety, limiting their application to fixed settings and preventing mobile or on-skin use.
Innovation Solution
Phosphor-converted LEDs with spectral power distributions showing local minima in the 950-990 nm range, reducing power consumption and allowing for compact, safer infrared radiation delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If water-filtered halogen lamps are used for radiotherapy, then therapeutic irradiance levels can be achieved, but power consumption is high and device size is large
Solution Approach 1:
The patent changes the fundamental operating parameters by switching from thermal radiation (halogen lamp) to electroluminescence (LED). This parameter change enables achieving the same therapeutic irradiance levels with significantly lower power consumption and without requiring water filters, thereby resolving the contradiction between energy efficiency and device complexity
Solution Approach 2:
The patent replaces the mechanical/thermal system (halogen lamp with water filter) with an optical/electrical system (LED). This substitution eliminates the need for bulky water filters and high-power consumption, directly addressing both the power consumption and device complexity issues
2Temperature
If water-filtered halogen lamps are used for radiotherapy, then therapeutic irradiance levels can be achieved, but the lamp housing temperature is high requiring large distance and safety measures
Solution Approach 1:
The patent changes the operating temperature parameter by using LED technology which operates at much lower temperatures compared to halogen lamps. This parameter change eliminates the need for large safety distances and complex fixation measures, directly resolving the contradiction between temperature control and ease of operation
Solution Approach 2:
The patent converts the harmful high-temperature operation of halogen lamps into a benefit by using LED technology that naturally operates at low temperatures. This conversion eliminates safety hazards and enables flexible application positions, including mobile and on-skin treatments
3Volume of moving object
If water-filtered halogen lamps are used for radiotherapy, then infrared radiation can be delivered, but the bulky form factor limits application to fixed settings
Solution Approach 1:
The patent changes the physical size parameter by using compact LED modules instead of bulky halogen lamp assemblies. This size reduction enables the device to be integrated into mobile platforms and wearable textiles, directly resolving the contradiction between device volume and application versatility
Solution Approach 2:
The patent enhances versatility by designing a universal LED-based platform that can be deployed in multiple configurations including fixed installations, mobile devices, and wearable textiles. This multi-functionality approach directly addresses the limitation of application flexibility
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 achieves therapeutic irradiance levels with reduced power consumption and a safer, more compact design, enabling mobile and on-skin applications.
Implementation Method 1
a phosphor layer arranged in an optical path of the light emitters, the phosphor layer including two or more phosphors arranged to absorb the first light and emit a second light
Implementation Method 2
a plurality of light emitters comprising light emitting diodes or lasers that emit a first light having a first peak wavelength
Data Source
Figure 1~2B
Figure 2C
Figure 3A~3B
AI summary
An light emitting device, may include pump LEDs or lasers and one or more phosphors allowing the lamp to emit light with a spectral power distribution having a local minimum at a water vapor absorption band, such as at 950-990 nm. Such a device may be used in radiotherapy based on hyperthermia, providing light that penetrates tissue without risk of skin overheating. Utilizing LEDs or lasers may allow the light emitting device to achieve higher efficiency, better form factor, and lower operating temperatures than water-filtered halogen lamps utilized in radiotherapy.