Multi-Needle RF Ablation Temperature Switching for Uniform Heating
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Solution Overview
Problem
Existing multi-needle radio frequency ablation technologies face challenges with inconsistent temperature rise rates and excessive temperature differences between ablation needles, leading to non-uniform ablation, tissue carbonization, prolonged recovery times, and reduced treatment efficacy for larger tumors.
Innovation Solution
A temperature control system for multiple radio frequency ablation needles, utilizing integrated temperature sensors, a radio frequency generator, and an ablation switch array controlled by a processor to maintain balanced heating by disconnecting or connecting needles based on temperature thresholds, ensuring uniform ablation zone heating and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-needle simultaneous ablation is performed, then ablation range and treatment efficiency are improved, but temperature differences between needles increase leading to non-uniform ablation
Solution Approach 1:
The system implements real-time temperature monitoring for each ablation needle using temperature sensors, with the controller receiving temperature signals and adjusting power distribution accordingly. This feedback mechanism enables dynamic compensation for temperature differences between needles, maintaining uniform ablation across all treatment zones while preserving the efficiency benefits of simultaneous multi-needle operation.
Solution Approach 2:
The patent employs dynamic power adjustment where the controller modifies the power supplied to each ablation needle based on real-time temperature conditions. This dynamic control allows the system to adapt to varying tissue characteristics and thermal accumulation rates at different needle sites, ensuring consistent ablation quality across multiple needles operating simultaneously.
2Loss of time
If higher power is applied to accelerate ablation, then treatment time is reduced, but tissue carbonization and overheating occur
Solution Approach 1:
The system uses real-time temperature feedback from sensors at each needle tip to dynamically adjust power delivery. When temperatures approach thresholds that could cause carbonization, the controller automatically reduces power to affected needles, preventing tissue damage while maintaining efficient ablation progression throughout the treatment process.
Solution Approach 2:
The patent implements dynamic parameter adjustment by modifying power levels based on real-time temperature measurements. The controller changes operational parameters (power intensity) in response to temperature conditions, enabling the system to operate at high efficiency without exceeding safe thermal thresholds that would cause tissue carbonization or necrosis.
3Productivity
If multiple high-frequency current generating modules are used for multi-needle ablation, then simultaneous ablation capability is improved, but device cost and complexity increase
Solution Approach 1:
The system segments the control function by providing each ablation needle with its own temperature sensor and control circuit, while sharing a common high-frequency current source. This segmentation of monitoring and control functions from the power generation function enables simultaneous multi-needle operation without requiring multiple complex current generating modules, thereby reducing overall system cost and complexity.
Solution Approach 2:
The patent implements a universal high-frequency current generating module that can simultaneously power multiple ablation needles. This single multi-functional module replaces what would otherwise require multiple separate current generators, achieving simultaneous ablation capability while significantly reducing device complexity and cost through resource sharing.
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
Achieves uniform and efficient ablation across multiple needles, reducing the risk of tissue carbonization and enhancing ablation efficiency while maintaining consistent heating rates, thus improving treatment outcomes for larger tumors.
Implementation Method 1
each radio frequency ablation needle configured with a temperature sensor for detecting the temperature value of that radio frequency ablation needle
Implementation Method 2
Radio frequency (RF) ablation, as one of these methods, works by using heat generated from high-frequency alternating current passing through the human body
Implementation Method 3
An ablation switch array, configured to make or break the electrical connection between designated radio frequency ablation needles among the N radio frequency ablation needles and the radio frequency generator
Data Source
AI summary
A temperature control system includes N radio frequency ablation needles, a radio frequency generator, an ablation switch array, and a controller; the controller is configured to: obtain N temperature values from the temperature sensors on the N radio frequency ablation needles, calculate a dynamically rising current reference temperature based on the N temperature values, determine a current upper temperature limit and a current lower temperature limit based on that current reference temperature, control the ablation switch array such that radio frequency ablation needles with temperature values exceeding the current upper temperature limit are disconnected from the radio frequency generator, and radio frequency ablation needles with temperature values below the current lower temperature limit are connected to the radio frequency generator.