RF Ablation Leakage Current Detection via Intermediary Measurement
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Solution Overview
Problem
Conventional techniques for addressing leakage current in RF ablation systems are inaccurate and unreliable, often requiring complete hardware redesign, which is inefficient and costly.
Innovation Solution
The RF ablation system employs switches to control electrical paths, allowing for the detection of leakage currents without complete hardware redesign. If excessive leakage current is detected, the system regulates RF power or aborts the therapy to enable clinicians to address the issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional simulation tools are used to address leakage current, then the design process can proceed, but the simulation results are inaccurate at high-frequency operating conditions
Solution Approach 1:
The patent introduces an intermediary measurement system that includes a measurement electrode positioned near the patient's body but electrically isolated from the main RF circuit. This intermediary setup allows indirect measurement of leakage current through voltage sensing, avoiding the need for direct high-frequency current measurements that conventional tools cannot accurately capture. The measurement system acts as a mediator between the RF ablation system and the detection apparatus, enabling accurate leakage current detection without disrupting the high-frequency operating conditions.
2Reliability
If hardware verification is performed to detect leakage current, then safety can be improved, but complete hardware redesign is required which is costly and time-consuming
Solution Approach 1:
The patent creates a simplified measurement model that copies only the essential leakage current detection functionality without requiring a complete hardware redesign. The measurement electrode and associated sensing circuitry form a simplified copy of the full RF system specifically tailored for leakage detection. This approach allows verification of leakage current safety while maintaining the existing complex RF ablation hardware, avoiding the need to redesign the entire system.
Solution Approach 2:
The patent segments the RF ablation system into distinct functional components: the main RF generation and delivery system, and a separate leakage current measurement system. The measurement system is further segmented into a measurement electrode, signal conditioning circuitry, and control logic. This segmentation allows the leakage detection functionality to be added or modified independently without affecting the complex main RF hardware, enabling safety verification without complete hardware redesign.
3Object-affected harmful factors
If leakage current detection is implemented, then patient safety is enhanced, but the system complexity increases due to additional measurement components
Solution Approach 1:
The measurement electrode serves multiple functions: it acts as a reference electrode for the RF ablation system, a sensing element for leakage current detection, and a ground reference for the measurement circuitry. By making the measurement components multi-functional, the patent reduces the need for separate dedicated leakage detection hardware, thereby limiting the increase in system complexity while still achieving enhanced patient safety through leakage current monitoring.
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 effective detection and management of leakage currents, enhancing patient safety, improving RF power delivery, and reducing the need for costly hardware redesign.
Implementation Method 1
RF energy may be used to generate heat that is then used to ablate biological tissue targeted by the RF ablation procedure
Implementation Method 2
measuring a leakage impedance while the electrical return path is disabled and the electrical signal is applied to the electrode
Data Source
AI summary
The present disclosure provides systems and methods for detecting leakage currents in radio-frequency (RF) ablation systems. An RF generator may be configured to disable an electrical return path from a patient to a ground terminal. The RF generator may also be configured to apply an electrical signal to an electrode that is positioned to be in proximity to target tissue of the patient. The RF generator may be further configured to measure a leakage impedance while the electrical return path is disabled and the electrical signal is applied to the electrode. The RF generator may also be configured to control RF ablation therapy based, at least in part, on the measured leakage impedance. Other features are also claimed and described.