Multi-Wavelength Laser Thermocoagulation Device
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Solution Overview
Problem
Current laser tissue welding and tissue bonding techniques face challenges in achieving uniform thermal coagulation and adhesion due to the high penetration depth of near-infrared laser radiation, leading to incomplete coagulation and insufficient adhesion, especially with the use of additional absorbers like indocyanine green which can cause cytotoxic effects.
Innovation Solution
A device utilizing at least two laser beam sources with different central wavelengths, where the ratio of their powers is dynamically adjusted over time or based on process signals to adapt to changing tissue properties during thermocoagulation, ensuring uniform heating and effective optical penetration depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If near-infrared laser radiation is used for tissue welding, then penetration depth is increased allowing deep tissue layers to be treated, but thermal coagulation becomes insufficient and adhesion strength is reduced
Solution Approach 1:
The laser source is segmented into multiple wavelength components (e.g., 805nm and 1064nm) that can be independently controlled. Each wavelength segment targets different tissue depths, with the control unit dynamically adjusting the power ratio between segments to achieve both deep penetration and sufficient coagulation strength
Solution Approach 2:
The system transitions from static single-wavelength operation to dynamic multi-wavelength operation. The control unit continuously adjusts the power ratio between different laser wavelengths based on real-time feedback, enabling the penetration depth and coagulation strength to be dynamically optimized throughout the welding process
2Reliability
If additional absorbers like indocyanine green are added to enhance absorption, then coagulation efficiency is improved, but cytotoxic effects and inflammatory reactions occur
Solution Approach 1:
The harmful extrinsic absorber (indocyanine green) is extracted from the system and replaced with intrinsic multi-wavelength laser absorption. The control unit manages the power distribution between wavelengths to achieve effective coagulation without requiring cytotoxic additives
Solution Approach 2:
The system changes the optical parameters by using multiple laser wavelengths instead of relying on chemical absorbers. The control unit adjusts the power ratio between wavelengths to optimize absorption and coagulation efficiency without introducing harmful substances into the tissue
3Device complexity
If single laser wavelength is used for thermocoagulation, then device complexity is reduced, but uniform heating across different tissue depths is compromised
Solution Approach 1:
Multiple laser wavelengths are merged into a single controllable system. The control unit combines the power outputs of different wavelength sources and dynamically adjusts their ratio to achieve uniform heating across various tissue depths while maintaining manageable device complexity
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 uniform thermal coagulation and enhanced adhesion by dynamically adjusting the laser power ratio to match changing tissue absorption and scattering properties, reducing the risk of incomplete coagulation and cytotoxic effects, while maintaining control over the coagulation depth and adhesion strength.
Implementation Method 1
LTW is based on the absorption of laser radiation and the heating of tissues
Implementation Method 2
at least two laser beam sources with different central wavelengths
Implementation Method 3
adapting the optical penetration depth to the tissue layer thickness
Implementation Method 4
tissue absorption and scattering properties
Implementation Method 5
heating of tissues, which, above temperatures of 60°C, leads to thermal coagulation of proteins
Implementation Method 6
heating of tissues
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention relates to a device for thermocoagulation by means of laser radiation, comprising at least two laser beam sources (2, 4) with different central wavelengths, an apparatus (6-8) for superposing the laser radiation from the laser radiation sources (2, 4) and a control apparatus (12) for controlling the laser power from the laser beam sources (2, 4). Here, the control apparatus (12) is embodied in such a way that, over time, it modifies the ratio of the laser powers from the laser beam sources (2, 4) in a treatment mode according to a predetermined course and/or depending on a process signal. Using the proposed device, the effective optical penetration depth during the treatment can be dynamically adapted to changing properties of the tissue and the wound dressing or the employed adhesive.