Hair Growth Modulation Device Using Wavelength-Selective Light
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Solution Overview
Problem
Existing hair growth modulation methods using light, such as those involving wavelengths like 890 nm, cause inflammation and are undesirable for human application due to potential pain and infection, whereas safer alternatives are needed.
Innovation Solution
Irradiating modulating light with a wavelength of 600 nm to 1000 nm, excluding 870 nm to 910 nm, around hair roots to promote hair growth without causing inflammation, using a device with light emitting diodes that control irradiation power and frequency to deliver 10 J/cm2 to 100 J/cm2 energy over 1 to 30 minutes daily for 3 to 10 days, preferably with pulsed illumination at 100 Hz to 1000 Hz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light with wavelength of 890 nm is used to promote hair growth, then hair growth effect is achieved, but skin inflammation and pain occur
Solution Approach 1:
The patent changes the wavelength parameter of the light from 890 nm (which causes inflammation) to specific ranges of 600-870 nm and 910-1000 nm (which do not cause inflammation). This parameter change allows the system to maintain hair growth promotion effectiveness while eliminating the harmful inflammatory side effects.
Solution Approach 2:
The patent identifies that the harmful effect (inflammation) is caused by specific wavelength absorption by melanin. By converting this knowledge into a beneficial strategy, the patent selects wavelength ranges that avoid melanin absorption peaks, thereby preventing inflammation while still achieving the desired hair growth effect through alternative mechanisms.
2Productivity
If drugs are used to cause inflammation for hair regeneration, then hair growth is accelerated, but pain and infection risks increase
Solution Approach 1:
The patent replaces the chemical mechanism (drugs causing inflammation) with a physical mechanism (light irradiation at specific wavelengths). This substitution eliminates the need for inflammatory responses, thereby avoiding pain and infection risks while still achieving hair growth acceleration through direct photobiological effects on hair follicles.
3Productivity
If light irradiation energy is increased to enhance hair growth effect, then hair growth is promoted more effectively, but risk of skin damage increases
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: wavelength (600-870 nm and 910-1000 nm), energy density (10-100 J/cm²), and irradiation time (1-30 minutes). This multi-parameter optimization ensures that sufficient energy is delivered to achieve hair growth effects while staying below thresholds that would cause skin damage.
Solution Approach 2:
The patent employs periodic irradiation protocols (irradiation for 1-30 minutes per day over 3-10 consecutive days) rather than continuous high-intensity exposure. This periodic action allows tissue recovery between sessions, preventing cumulative damage while maintaining therapeutic effectiveness through repeated stimulation of hair follicles.
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 approach safely and gently promotes hair growth by avoiding inflammation, with effective hair growth observed within four weeks without adverse skin reactions, as demonstrated by experiments on mice, while maintaining skin safety and optimizing energy delivery.
Implementation Method 1
irradiating modulating light having a wavelength of 600 nm to 1000 nm excluding a range of 870 nm to 910 nm, to a portion around hair roots of a human body such that the modulating light is absorbed by a light absorptive component of the human body existing around the hair roots
Data Source
AI summary
A modulating light having a wavelength of 600 nm to 1000 nm excluding a range of 870 nm to 910 nm is irradiated to a portion around hair roots such that a light absorptive component existing in a human body around the hair roots absorbs the light for modulating hair growth. The light having the wavelength in the above range enhances hair growth free from causing inflammation, yet safely and gentle to skin.