Microwave Ablation Zone Visualization for Boundary Control
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Solution Overview
Problem
Existing ablation systems face limitations with RF energy dissipation in surface tissues, shallow burns, and eschar and clot formation on electrodes, while microwave energy offers deeper penetration and more reliable energy deposition but lacks visualization of the expected ablation treatment area during procedures.
Innovation Solution
A system and method for delivering microwave energy using ablation probes with integrated imaging and control systems to visualize the expected ablation zone in real-time, utilizing a graphical user interface to display predicted and progressive ablation zones based on power and time settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If RF energy is used for ablation, then energy deposition is achieved, but energy dissipates rapidly in surface tissues causing shallow burns and failing to access deeper tissues
Solution Approach 1:
The patent changes the energy type parameter from RF to microwave, which fundamentally alters the penetration characteristics. Microwave energy at specific frequencies (e.g., 915 MHz, 2.45 GHz) provides deeper tissue penetration and more uniform energy distribution compared to RF, enabling treatment of deeper structures without excessive surface heating.
Solution Approach 2:
The patent replaces the RF-based thermal field with a microwave-based thermal field. This substitution leverages the different physical properties of microwave radiation, which penetrates tissue more effectively and creates more uniform heating patterns, thereby resolving the shallow burn problem while maintaining ablation effectiveness.
2Reliability
If RF ablation is performed, then tissue ablation is achieved, but eschar and clot formation occurs on electrodes limiting further energy deposition
Solution Approach 1:
The patent substitutes RF energy delivery with microwave energy delivery. Microwave antennas are less susceptible to eschar and clot formation compared to RF electrodes because microwave energy penetrates tissue more uniformly and does not rely on direct electrical contact, thereby maintaining reliable energy deposition throughout the ablation process.
Solution Approach 2:
The patent introduces microwave radiation as an intermediary energy delivery mechanism between the external source and the target tissue. This intermediary approach avoids direct electrode-tissue contact that causes eschar and clot formation, allowing continuous energy delivery without the harmful side effects of RF electrodes.
3Temperature
If microwave energy is used for ablation, then deeper tissue penetration and more reliable energy deposition are achieved, but visualization of the expected ablation treatment area during procedures is not available
Solution Approach 1:
The patent implements real-time feedback by displaying the predicted ablation zone on a graphical user interface during the procedure. The system calculates and visualizes the expected ablation treatment area based on the microwave parameters (power, duration, tissue properties), providing immediate feedback to the operator about the anticipated outcome and enabling informed decision-making during the ablation process.
Solution Approach 2:
The patent creates a visual copy or representation of the expected ablation zone overlaid on anatomical images. This graphical representation serves as a predictive model that mirrors the actual ablation zone that will be created, allowing operators to visualize and plan the treatment without requiring real-time physical visualization during the procedure.
4Speed
If microwave energy is used for ablation, then faster tissue heating and larger thermal lesions are produced, but control precision over the ablation zone boundaries is reduced
Solution Approach 1:
The patent uses real-time feedback through graphical display of the predicted ablation zone to help operators control the ablation process. By visualizing the expected thermal lesion boundaries and comparing them with anatomical structures, operators can adjust microwave parameters dynamically to achieve precise control over the ablation zone while maintaining fast heating rates.
Solution Approach 2:
The patent enables dynamic adjustment of microwave parameters (power levels, duration, frequency) during the ablation process based on real-time feedback. This dynamic control allows the system to adapt to varying tissue properties and anatomical constraints, maintaining precision in ablation zone boundaries even while achieving rapid tissue heating and large thermal lesion formation.
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
Enables precise visualization of the ablation treatment area, allowing for controlled and effective tissue ablation procedures with deeper penetration and reduced tissue damage.
Implementation Method 1
More recently, microwave energy is being used as the ablating energy source in ablation systems. Microwave energy is an effective energy source for heating biological tissues
Data Source
AI summary
A system is disclosed including an ablation probe that includes an antenna, a display, and a controller in communication with the ablation probe and the display. The controller comprises a memory and is operable to receive first and second inputs indicative of an amount of time and a power level, respectively, to energize the ablation probe, retrieve, from the memory, a predicted ablation zone corresponding to the first and second inputs, display, on the display, an image representative of the ablation probe, and overlay, on the image, the predicted ablation zone, energize the ablation probe at the power level, and dynamically overlay, on the image, a progressive ablation zone based on the ablation probe being energized, wherein a size of the progressive ablation zone is retrieved from the memory based on the amount of time the ablation probe has been energized at the power level.