Electrosurgical RF Signal Control Near Excitable Tissue
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Solution Overview
Problem
Monopolar electrosurgical devices often cause unintended damage to non-target excitable tissue due to poorly characterized current paths, leading to muscle weakness, pain, numbness, and paralysis.
Innovation Solution
An electrosurgical device that combines therapeutic RF signals with excitable tissue stimulating signals, using a controller to adjust the electrical output based on sensing device inputs to minimize unintended tissue stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monopolar electrosurgical devices are used to deliver therapeutic RF energy, then treatment effectiveness is improved, but unintended damage to non-target excitable tissue occurs due to poorly characterized current paths
Solution Approach 1:
The device incorporates sensing electrodes that detect electrical signals from excitable tissue and feed this information back to the controller. The controller adjusts the therapeutic RF signal in real-time based on this feedback, preventing unintended stimulation of nerves and muscles while maintaining effective tissue treatment.
Solution Approach 2:
Sensing electrodes act as intermediaries between the therapeutic RF energy delivery system and the excitable tissue. These electrodes detect electrical activity in the tissue and transmit this information to the controller, which then modulates the RF output to prevent harmful stimulation while preserving therapeutic effects.
2Manufacturing precision
If RF energy is delivered through tissue to achieve therapeutic effects, then treatment outcome is improved, but excitable tissue such as nerves and muscles may be inadvertently stimulated causing pain, weakness, or paralysis
Solution Approach 1:
The controller continuously monitors electrical signals from sensing electrodes placed near excitable tissue and adjusts the RF energy delivery in real-time. When the sensing electrodes detect signals indicating proximity to or stimulation of excitable tissue, the controller modifies the RF output to prevent adverse neurological effects while maintaining therapeutic precision.
Solution Approach 2:
The device dynamically adjusts the RF energy delivery parameters based on real-time feedback from sensing electrodes. The system transitions between different operational states (normal delivery, reduced power, or interrupted delivery) depending on the detected electrical activity in the tissue, enabling precise control over treatment effects.
3Measurement precision
If a bipolar device is used to provide a short current path through tissue, then current path control is improved, but device complexity increases compared to monopolar devices
Solution Approach 1:
The device combines multiple functions in a single probe: it includes both active and return electrodes for bipolar RF energy delivery, as well as sensing electrodes for detecting excitable tissue. This multi-functional design achieves precise current path control and excitable tissue detection without requiring separate devices, balancing complexity with functionality.
Solution Approach 2:
The invention merges the therapeutic RF energy delivery function with the excitable tissue detection function into a single integrated device. The sensing electrodes are incorporated alongside the active and return electrodes, allowing simultaneous monitoring and treatment within one probe structure.
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
Reduces unintended tissue damage by precisely controlling the electrical current path, ensuring targeted treatment while minimizing harm to non-target excitable tissues.
Implementation Method 1
the electrical current sourced by the electrical generator combines characteristics of a therapeutic electrical signal and characteristics of an excitable tissue stimulating signal
Implementation Method 2
a sensing device having a sensing device output, and the sensing device is configured to determine a stimulation of an excitable tissue by the excitable tissue stimulating signal
Implementation Method 3
the controller is configured to adjust one or more characteristics of the therapeutic electrical signal based on the sensing device output
Data Source
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AI summary
An electrosurgical device may include a controller including an electrical generator, a surgical probe having a distal active electrode in electrical communication with an electrical source terminal of the electrical generator, and a return pad in electrical communication with an electrical return terminal of the electrical generator. The electrical generator may be configured to source an electrical current from the electrical source terminal, in which the electrical current combines characteristics of a therapeutic electrical signal and characteristics of an excitable tissue stimulating signal. The device may be configured to determine a distance from the electrode to an excitable tissue, based at least in part on an output signal generated by a sensing device in the pad. The device may also be configured to alter one or more characteristics of the therapeutic signal when the distance from the electrode to the tissue is less than a predetermined value.