Fractional Handpiece with Passively Q-Switched Micro-Beam Laser
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Solution Overview
Problem
Existing laser systems for non-invasive skin treatment are limited by the capabilities of individual lasers, requiring multiple lasers, increasing size, cost, and complexity, and face challenges in delivering high power ultrashort pulses without causing skin damage, particularly due to the limitations of fiber and articulated arm delivery systems.
Innovation Solution
A compact fractional handpiece with a passively Q-switched laser assembly and beam splitting assembly that generates high-energy subnanosecond pulses, utilizing double pass pumping and a monolithic or external cavity design to reduce size and complexity, and includes a beam splitting mechanism for fractional skin treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lasers are placed in the cabinet to treat different skin imperfections, then the treatment capability is improved, but the system size, cost and complexity increase
Solution Approach 1:
The patent implements a single laser system capable of multiple wavelengths (e.g., 755nm, 694nm, 532nm) that can treat various skin imperfections including tattoos, pigmentation, and vascular lesions. This multi-functional laser replaces multiple separate lasers, reducing system complexity while maintaining comprehensive treatment capability across different skin conditions
2Power
If high laser power is supplied to prevent skin damage, then the treatment effectiveness is improved, but the risk of skin damage increases when using traditional delivery systems
Solution Approach 1:
The patent employs ultrashort pulse duration (picosecond to sub-nanosecond regime) delivering high peak power in extremely brief intervals. This periodic ultra-short pulsing allows sufficient energy delivery for effective treatment while the brief duration prevents heat accumulation and thermal damage to surrounding skin tissue, solving the contradiction between power delivery and safety
3Ease of operation
If an articulated arm is used to deliver laser to improve flexibility, then the freedom of movement is improved, but the laser power transmission efficiency deteriorates
Solution Approach 1:
The patent extracts the laser source from the traditional cabinet-and-articulated-arm configuration and integrates it directly into a handpiece that the operator holds and moves freely. This eliminates the articulated arm delivery system entirely, maintaining operational flexibility while avoiding the energy loss and power transmission limitations associated with articulated arm mechanisms
4Device complexity
If a long cavity laser is used to simplify the design, then the device complexity is reduced, but the pulse duration increases reducing effectiveness
Solution Approach 1:
The patent achieves sub-nanosecond pulse durations by precisely controlling key laser parameters including cavity length (reducing to millimeter scale), Q-switching mechanism timing, and gain medium properties. These parameter optimizations enable ultrashort pulses without requiring excessively complex multi-stage configurations, balancing simplicity with performance
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 achieves efficient delivery of high-energy subnanosecond pulses for fractional skin treatment, reducing system size and cost while maintaining power efficiency and flexibility, suitable for various applications including cosmetic and medical treatments.
Implementation Method 1
A fractional handpiece with a passively Q-switched laser assembly and a beam splitting assembly
Implementation Method 2
a beam splitting assembly operable to split a beam emitted by the passively Q-switched laser assembly into a plurality of beams
Data Source
AI summary
A fractional handpiece and systems thereof for skin treatment include a passively Q-switched laser assembly operatively connected to a pump laser source to receive a pump laser beam having a first wavelength and a beam splitting assembly operable to split a solid beam emitted by the passively Q-switched laser assembly and form an array of micro-beams across a segment of skin. The passively Q-switched laser assembly generates a high power sub-nanosecond pulsed laser beam having a second wavelength.