Picosecond Laser Pulse Control for Precise Tissue Ablation
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Solution Overview
Problem
Current laser treatments for tissue modification, such as scar reduction and cosmetic procedures, often result in unwanted thermal damage to adjacent areas due to aggressive thermal treatments, necessitating a solution that limits thermal damage to the target area while minimizing effects on surrounding tissues.
Innovation Solution
A system and method utilizing a controller to adjust pulse width and fluence of a laser to achieve a combination of thermal and mechanical effects, with specific embodiments including shorter and longer pulse widths to control the percentage of thermal versus mechanical damage, and focusing laser emission to create electron ionization and pressure waves for targeted 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 pulse duration from nanosecond to picosecond scale, and adjusts pulse width within 100-900 picoseconds to control the ratio of photothermal to photomechanical effects. This parameter change enables precise control over energy deposition, achieving desired treatment depth while limiting thermal damage to adjacent tissues through shorter pulse durations that reduce heat diffusion time.
Solution Approach 2:
The system dynamically adjusts pulse width across different ranges (100-300 ps for shallower depths, 300-900 ps for deeper depths) to optimize the balance between photothermal and photomechanical effects. This dynamic parameter adjustment allows the treatment to adapt to different tissue depths and requirements, maintaining precision while controlling thermal spread.
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 allows for precise tissue treatment with controlled thermal and mechanical effects, reducing unwanted thermal damage and promoting tissue regeneration by creating layers of cell damage that enhance healing and collagen formation.
Implementation Method 1
concentrating the laser emission to a depth of desired treatment with a fluence sufficient to create electron ionization of the target
Implementation Method 2
providing shock wave pressure emission intensity to the tissue adjacent the target
Implementation Method 3
Photothermal mechanisms for tissue treatment have been widely exploited for medical and cosmetic tissue treatments
Data Source
Figure 1A
Figure 1B
Figure 2(a)~2(b)
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.