Cooled RF Generator with Real-Time Impedance Feedback
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Solution Overview
Problem
Current RF generators for tissue ablation lack real-time graphic displays of impedance, current, and temperature, making it difficult for clinicians to monitor and adjust the ablation process effectively, especially with cooled RF electrodes which can deliver high currents and heat large volumes of tissue, and existing systems do not provide optimal control over the ablation process to prevent overheating and achieve maximum lesion size.
Innovation Solution
A system that includes a cooled HF electrode with a graphical display showing impedance and generator output level in real time, a controller for automatic modulation of RF output based on tissue impedance, multiple ground pads with current monitoring and switching, and an ultrasound imaging system, allowing for simultaneous control of RF and ultrasound devices from a single interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cooled RF electrodes are used to deliver high currents for tissue ablation, then lesion size and ablation effectiveness are improved, but risk of overheating and loss of control increase
Solution Approach 1:
The system employs real-time impedance monitoring with automatic modulation of RF output. The controller continuously measures tissue impedance and adjusts the RF power delivery accordingly, reducing power when impedance indicates overheating or boiling, and increasing power when impedance suggests adequate cooling. This closed-loop feedback system enables safe delivery of high currents while preventing dangerous overheating.
Solution Approach 2:
The system dynamically adjusts RF output parameters based on real-time tissue conditions. By continuously monitoring impedance variations and automatically modulating power delivery, the system adapts to changing tissue properties during ablation, enabling optimal balance between achieving effective lesion sizes and preventing harmful overheating.
2Measurement precision
If real-time monitoring of impedance and generator output is implemented, then control precision and safety are improved, but device complexity increases
Solution Approach 1:
The generator integrates multiple functions into a single device: RF power delivery, real-time impedance monitoring, automatic output modulation, and graphical display of critical parameters. This multi-functional integration provides precise monitoring and control capabilities while avoiding the need for separate monitoring equipment, thereby managing system complexity.
Solution Approach 2:
The system combines the RF generator, monitoring circuitry, control algorithm, and display interface into a unified integrated system. By merging these components, the patent achieves real-time precise monitoring of impedance and output parameters without requiring multiple separate devices, thus improving measurement precision while controlling overall system complexity.
3Ease of operation
If automatic modulation of RF output based on impedance is implemented, then ablation control and prevention of overheating are improved, but device complexity increases
Solution Approach 1:
The system performs automatic self-regulation of RF output based on real-time impedance measurements. The controller automatically modulates power delivery without requiring manual intervention, enabling the system to self-adjust to tissue conditions, prevent overheating, and optimize ablation effectiveness autonomously.
Solution Approach 2:
The automatic modulation system uses real-time impedance feedback to control RF output. The controller continuously monitors impedance and automatically adjusts power delivery based on impedance changes, providing intelligent control that simplifies operation while managing complexity through algorithmic automation.
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 real-time monitoring and control of the ablation process, preventing overheating and maximizing lesion size by displaying critical parameters on a single interface, improving the precision and safety of tissue ablation procedures.
Implementation Method 1
The use of radiofrequency (RF) and microwave (MW) generators connected to non-cooled electrodes inserted into the tissue of the body so that the signal output from the high frequency (HF) generator ablates the tissue
Implementation Method 2
Use of cooled RF and MW electrode systems have also been in use for decades
Data Source
AI summary
This invention relates to high-frequency ablation of tissue in the body using a cooled high-frequency electrode connected to a high frequency generator including a computer graphic control system and an automatic controller for control the signal output from the generator, and adapted to display on a real time graphic display a measured parameter related to the ablation process and visually monitor the variation of the parameter of the signal output that is controlled by the controller during the ablation process. In one example, one or more measured parameters are displayed simultaneously to visually interpret the relation of their variation and values. In one example, the displayed one or more parameters can be taken from the list of measured voltage, current, power, impedance, electrode temperature, and tissue temperature related to the ablation process. The graphic display gives the clinician an instantaneous and intuitive feeling for the dynamics and stability of the ablation process for safety and control. This invention relates to monitoring and controlling multiple ground pads to optimally carry return currents during high-frequency tissue ablation, and to prevent of ground-pad skin burns. This invention relates to the use of ultrasound imaging intraoperatively during a tissue ablation procedure. This invention relates to the use of nerve stimulation and blocking during a tissue ablation procedure.