Dual-Probe RF Ablation with Multi-Electrode Merging
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Solution Overview
Problem
Current radiofrequency ablation systems for metastatic bone disease are limited in ablating irregular shapes and larger spaces, as they rely on conduction of heat between two probe tips and require repositioning, lacking the capability to transmit energy between probes.
Innovation Solution
A system with two probes, each having two electrodes and three temperature sensors, connected to a radiofrequency generator that can transmit energy between any pair of electrodes, including a grounding pad for energy return, and a processor to adjust energy based on temperature readings for precise ablation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two probes are used with conduction of heat between probe tips, then ablation of tissue between probes is achieved, but irregular shapes and larger spaces cannot be ablated without repositioning
Solution Approach 1:
The patent combines multiple electrodes (four electrodes across two probes plus grounding pad) into a single integrated system that can transmit radiofrequency energy between any pair of electrodes. This merging allows the system to treat irregularly shaped tumors in a single procedure without requiring probe repositioning, as energy can be directed from multiple electrode combinations to cover complex geometries.
Solution Approach 2:
The radiofrequency generator is designed with universal capability to transmit energy between any pair of electrodes regardless of which probe they belong to. This multi-functionality enables the same system to handle various tumor shapes and sizes by simply changing which electrode pair is activated, eliminating the need for multiple specialized probes or repositioning operations.
2Measurement precision
If temperature sensors are placed near probe distal end, then temperature monitoring is achieved, but singeing of adjacent tissue occurs
Solution Approach 1:
The patent introduces cooling fluid as an intermediary substance that flows through channels in the probe, positioned between the heat-generating electrodes and the surrounding tissue. This cooling mediator absorbs excess heat and prevents it from damaging adjacent tissue, while allowing temperature sensors to accurately monitor the thermal environment for precise control.
Solution Approach 2:
The system employs hydraulic cooling by circulating fluid through internal channels of the probe. This pneumatic/hydraulic mechanism actively removes heat from the probe surface and electrode interfaces, preventing tissue singeing while maintaining the temperature gradients necessary for effective ablation and accurate sensor measurements.
3Productivity
If radiofrequency energy is transmitted between electrode pairs, then tissue ablation is achieved, but precise control of ablation pattern is difficult
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor the thermal environment during radiofrequency ablation. The system uses this temperature feedback to automatically adjust the radiofrequency energy delivery, ensuring precise control over the ablation pattern while maintaining high productivity. The feedback loop prevents overheating and ensures the ablation boundary matches the desired treatment zone.
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 efficient ablation of irregularly shaped tumors without repositioning probes, reducing procedure time and improving precision by automatically adjusting energy application based on temperature data.
Implementation Method 1
A pair of electrodes are located at the end of the probe which is inserted into the unwanted tissue. The opposite end of the probe is connected to a radiofrequency generator which sends radiofrequency energy through the electrodes causing the immediately adjacent tissue to heat up.
Implementation Method 2
The system may include channels through the probes, enabling the circulation of cooling fluid to help prevent singeing the tissue immediately adjacent the probes.
Data Source
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AI summary
A system for use in tumor ablation. The tumor ablation system includes a pair of probes connectable to a radiofrequency generator. Each of the probes includes two electrodes located between three temperature sensors, wherein the radiofrequency generator may apply radiofrequency energy between any two electrodes.