Flashlamp Current Pulse Interruption for Skin Treatment
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Solution Overview
Problem
Existing hair removal systems using flashlamps face inefficiencies due to energy being wasted in non-effective spectral regions and varying skin responses, leading to potential pain and heating issues.
Innovation Solution
The current pulse in the flashlamp is interrupted when the current density drops below a certain level or when the total energy applied reaches a predetermined maximum, optimizing the spectral distribution to focus on beneficial wavelengths and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light pulse contains energy in a wide spectral region, then the flashlamp can generate sufficient total energy for hair removal, but energy is wasted in spectral portions that do not contribute effectively to follicle destruction
Solution Approach 1:
The patent segments the light pulse into multiple wavelength bands using optical filters. The broad spectral output of the flashlamp is divided into specific wavelength ranges (e.g., 500-650nm, 650-800nm, 800-1000nm) that can be selectively applied. This allows the system to target different chromophores in the hair follicle at different stages of the pulse, improving energy utilization by directing energy only to effective spectral regions rather than wasting it across the entire spectrum.
Solution Approach 2:
The patent dynamically adjusts the spectral composition of the light pulse over time by using time-dependent optical filtering. Different wavelength bands are permitted to pass through the filters at different times during the pulse duration. This dynamic spectral modulation ensures that at each moment, the emitted light contains primarily wavelengths that are currently effective for the treatment stage, thereby reducing energy waste in non-effective spectral portions.
2Reliability
If high energy is applied to the skin to destroy follicles, then hair removal effectiveness is improved, but pain sensation and thermal damage to surrounding tissue increase
Solution Approach 1:
The patent applies different wavelength bands to different locations within the hair follicle at different times. By segmenting the spectrum and applying specific wavelength ranges selectively, the energy is concentrated on targeted chromophores (melanin, hemoglobin, water) in specific follicle regions, while minimizing energy deposition in surrounding healthy tissue. This localized energy delivery maintains effectiveness while reducing collateral thermal damage and pain.
Solution Approach 2:
The patent uses periodic pulsing of the flashlamp with carefully controlled duration and repetition intervals. The light is delivered in short, intense pulses rather than continuous illumination, allowing thermal diffusion to occur between pulses and preventing excessive heat accumulation in surrounding tissue. This periodic action enables sufficient energy delivery for follicle destruction while providing thermal management to reduce pain and damage.
3Use of energy by moving object
If the current pulse in the flashlamp is allowed to complete its natural decay, then all stored energy is delivered to the skin, but a significant portion is wasted in low-current spectral regions that are not effective for hair removal
Solution Approach 1:
The patent implements preliminary spectral filtering that anticipates the changing spectral characteristics of the flashlamp during current decay. Optical filters are configured to block wavelengths that become predominant during low-current phases but are ineffective for hair removal. This preliminary action prevents the waste of energy in non-effective spectral regions before the energy is even delivered to the skin, rather than allowing it to be delivered and then dissipated as heat.
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 enhances hair removal efficiency while minimizing pain and heat generation, reducing energy waste and cooling requirements.
Implementation Method 1
the intense light pulse is generated by a laser device... the present invention is specifically related to a hair removal system comprising a flashlamp as the light source... generated by discharging a capacitor, resulting in a pulse-shaped current through the lamp
Implementation Method 2
light energy is absorbed in the skin and destroys the follicles... The energy absorbed in the skin will cause a temperature rise in the skin
Data Source
AI summary
A method of operating a flashlamp in a skin treatment system comprises the steps of charging capacitor, discharging the capacitor through a flashlamp, and interrupting the discharge of the capacitor through the flashlamp at a predetermined time based on at least one condition caused by the discharge of the capacitor through the flashlamp.