Picosecond Laser Tissue Targeting With Reduced Thermal Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current light-based tissue treatments, such as laser therapies, often result in unwanted thermal damage to areas outside the target treatment area due to aggressive thermal approaches, which can limit the effectiveness and safety of medical and cosmetic procedures.
Innovation Solution
A system utilizing a picosecond laser with pulse widths ranging from 260 to 900 picoseconds and fluences from 0.8 to 50 J/cm² to induce optical breakdown, creating a controlled pressure wave emission that can be adjusted to minimize thermal damage by varying pulse width and fluence, allowing for both thermal and mechanical effects in tissue treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aggressive thermal treatment is used to achieve desired treatment depth, then treatment effectiveness is improved, but thermal damage to adjacent regions increases
Solution Approach 1:
The patent changes the fundamental parameter of laser pulse duration from nanosecond to picosecond scale, and adjusts fluence parameters to exceed electron ionization threshold. This parameter change transforms the dominant interaction mechanism from photothermal to photomechanical/optical breakdown, enabling precise tissue remodeling at desired depths while minimizing thermal damage to adjacent regions through the ultra-short pulse duration that prevents heat diffusion.
Solution Approach 2:
The patent replaces the thermal mechanism (photothermal heating) with a photomechanical mechanism (optical breakdown and pressure wave generation). By using picosecond laser pulses with fluence above the electron ionization threshold, the system induces optical breakdown and cavitation bubble formation that generates controlled pressure waves for tissue remodeling, substituting the thermal field with a mechanical field to achieve the same treatment goals without thermal damage.
2Temperature
If longer pulse width is used, then thermal effect is increased, but mechanical effect (pressure wave emission) is reduced
Solution Approach 1:
The patent employs dynamic control of pulse width within the picosecond range (260-900 ps) to balance thermal and mechanical effects. By dynamically adjusting the pulse duration parameter, the system can optimize the ratio of thermal to mechanical effects for different treatment requirements, enabling flexible control over the treatment mechanism while maintaining the ultra-short pulse regime that prevents excessive heat diffusion.
Solution Approach 2:
The patent systematically varies the pulse width parameter within the picosecond regime to control the relative intensity of thermal versus mechanical effects. By changing this temporal parameter, the system can tune the interaction mechanism: shorter pulses favor mechanical pressure wave generation, while longer pulses within the picosecond range increase thermal accumulation, allowing optimization for specific treatment goals without transitioning to nanosecond scales that would dominate thermal effects.
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 enables precise tissue remodeling and regeneration by controlling the percentage of thermal versus mechanical damage, reducing unwanted thermal effects and promoting targeted tissue rejuvenation with minimal collateral damage.
Implementation Method 1
concentrating the laser emission to at least one target at a depth in the tissue at a fluence sufficient to exceed the electron ionization threshold of the target to result in an ablation volume
Implementation Method 2
fluence sufficient to exceed the electron ionization threshold of the target
Implementation Method 3
the pulse width is selected to control a pressure wave emission from the ablation volume to tissue adjacent the target
Implementation Method 4
Picosecond Laser Induced Optical Breakdown Therapy
Data Source
AI summary
Systems and methods for treating tissue by concentrating a laser emission to at least one depth at a fluence sufficient to create an ablation volume in at least a portion of the target tissue and controlling pulse width within the picosecond regime to provide a desired mechanical pressure in the form of shock waves and/or pressure waves.