Multi-Polar RF Ablation Probe Switching for Lesion Geometry Control
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Solution Overview
Problem
Current RF ablation technologies face challenges in dynamically controlling lesion geometries and impedance matching during RF ablation therapy, leading to inconsistent lesion formation and potential tissue damage due to cavitation.
Innovation Solution
A multi-polar RF ablation system with a microprocessor-controlled switch matrix and variable impedance matching circuits that dynamically configure electrical contacts to optimize RF energy distribution, ensuring balanced or uneven current flow and automatically stopping therapy when impedance thresholds are exceeded to prevent tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If RF ablation therapy is performed with fixed contact configuration, then the treatment process is simple, but lesion geometry control is inconsistent and tissue damage may occur
Solution Approach 1:
The patent implements dynamic reconfiguration of electrical contacts during RF ablation therapy. The controller dynamically changes the configuration of electrical contacts in the multi-polar probe, transitioning between different polar configurations (e.g., from bi-polar to tri-polar) based on real-time impedance measurements and treatment requirements, enabling precise lesion geometry control while maintaining system safety
Solution Approach 2:
The patent divides the RF ablation system into multiple independently controllable electrical contacts within the multi-polar probe. Each contact can be independently configured as positive or negative polarity and can be individually switched during treatment, allowing segmented control of RF energy distribution to achieve precise lesion shaping while managing overall system complexity
2Reliability
If RF energy is delivered without impedance monitoring, then the treatment is simpler, but tissue damage due to cavitation cannot be prevented
Solution Approach 1:
The patent implements real-time impedance monitoring during RF ablation therapy. The controller continuously measures impedance across the electrical contacts and uses this feedback to dynamically adjust the RF energy delivery and reconfigure contact polarities. This closed-loop feedback mechanism prevents tissue damage by detecting impedance changes that indicate cavitation or abnormal tissue conditions
Solution Approach 2:
The patent performs preliminary impedance measurements before initiating RF energy delivery and continues monitoring throughout treatment. The system proactively adjusts treatment parameters and contact configurations in advance to prevent harmful conditions, rather than reacting after damage occurs
3Manufacturing precision
If multi-polar probe with dynamic reconfiguration is implemented, then lesion formation precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal controller that manages multiple functions including impedance measurement, RF energy delivery control, contact configuration switching, and treatment parameter adjustment. This single multi-functional controller coordinates all aspects of the multi-polar probe operation, improving lesion formation precision while managing device complexity through integrated control rather than separate dedicated systems
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
The system enables precise control over lesion formation, preventing tissue damage by dynamically adjusting contact configurations and impedance matching, thereby optimizing lesion size and shape while ensuring safe operation during RF ablation therapy.
Implementation Method 1
a radio-frequency (RF) generator that produces RF energy having a predetermined frequency and power
Implementation Method 2
each switch having a respective terminal electrically coupled to a respective RF output line, each switch electrically coupled to the controller
Data Source
AI summary
A lesion control system includes a radio-frequency (RF) generator that produces RF energy having a predetermined frequency and power; a controller comprising a microprocessor; a multi-polar RF ablation probe having a plurality of electrical contacts; a plurality of RF input lines electrically coupled to an output terminal of the RF generator; a plurality of RF output lines, each RF output line electrically coupled to a respective one or more of the electrical contacts in the multi-polar RF ablation probe; an RF return line electrically coupled to a return terminal of the RF generator; and a plurality of switches, each switch having a respective terminal electrically coupled to a respective RF output line, each switch electrically coupled to the controller. The controller is configured to produce switch control signals that change a respective state of one or more of the switches to set a configuration of the multi-polar RF ablation probe.