Galvanic and Pulsed Optical Energy for Depilation
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Solution Overview
Problem
Existing depilation methods using intense pulsed light (IPL) or pulsed laser energy face challenges such as inadequate heating of hair follicles due to energy absorption by the epidermis rich in melanin, leading to insufficient thermal destruction and potential damage, especially in dark skin, and issues with wavelength penetration depth.
Innovation Solution
A depilatory device that combines continuous galvanic energy with pulsed optical energy (IPL or laser) to open hair follicle pores, increasing exposure and penetration of the pulsed energy, while the galvanic energy is at a non-destructive level to prepare the area for treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If higher energy levels are used to generate sufficient heating of the hair follicles, then the heating effect is improved, but charring and hyper-pigmentation occur and the epidermis is damaged
Solution Approach 1:
The patent applies a preliminary action by using galvanic current before optical energy to open the pores around the hair follicle. This preparatory step increases exposure of the hair follicle, allowing subsequent optical energy to penetrate more effectively at lower, safer energy levels that avoid epidermal damage while still achieving sufficient follicle heating.
2Reliability
If higher energy levels are used to destroy the hair follicle, then the depilation effectiveness is improved, but burns occur especially on dark skin
Solution Approach 1:
The patent introduces galvanic current as an intermediary that prepares the treatment area by opening pores and increasing follicle exposure. This intermediary action enables the optical energy to work more efficiently at reduced intensity levels, achieving reliable follicle destruction without the harmful burns that occur with high-energy direct application, particularly on dark skin types.
3Length of stationary object
If the wavelength is increased to improve penetration depth, then the energy can reach the follicle more effectively, but the energy absorption by melanin in the epidermis increases
Solution Approach 1:
The galvanic current is applied beforehand to open the pores and prepare the pathway for optical energy. This preliminary action reduces the barrier effect of the epidermis, allowing optical energy to penetrate more deeply to reach the follicle with less energy loss to superficial melanin absorption.
4Device complexity
If continuous wave optical energy is used, then the device is simpler, but the energy is insufficient to destroy the hair follicle
Solution Approach 1:
The patent merges two different energy modalities: continuous galvanic current and pulsed optical energy. The galvanic component can be delivered continuously with simple hardware, while the pulsed optical component provides the necessary peak intensity for follicle destruction. This combination achieves effective depilation without requiring complex pulsed LED systems alone.
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
Enhances the efficiency of hair follicle destruction by improving energy delivery and reducing the risk of damage to the epidermis, allowing for more effective hair removal with controlled heating and safer application across various skin types.
Implementation Method 1
the galvanic energy opens the pores around the hair follicle to increase exposure of the hair follicle for the optical pulsed energy
Implementation Method 2
Light energy that causes thermal destruction of the hair shaft and follicle is in the range of wavelengths that are specifically absorbed by the pigment melanin found in the hair follicle, also referred to as selective photothermolysis
Implementation Method 3
Light energy that causes thermal destruction of the hair shaft and follicle
Implementation Method 4
the wavelength may be insufficient for penetration deep enough to reach the target due to tissue scattering which depends on wavelength
Data Source
Figure 1~4
AI summary
A method for photothermolysis that includes applying galvanic current energy to skin at an area of a hair follicle and applying pulsed optical energy to the skin at the area of the hair follicle at an energy level and duration so as to cause thermal destruction of a hair papilla.