Electrosurgical Arc Suppression via Pulse Threshold Control

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Solution Overview

Problem

Electrical arc formation during electrosurgical procedures leads to increased current draw, potentially damaging tissue and the electrosurgical generator due to overcurrent conditions, which existing technologies fail to effectively suppress.

Innovation Solution

An electrosurgical system that supplies pulsed current to tissue, measures each pulse, and compares it to a predetermined threshold, terminating the pulse if it exceeds the threshold to prevent arc formation, utilizing a current limiting circuit to control the pulsed current output on a pulse-by-pulse basis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If high radio frequency electrical current is applied to tissue during electrosurgery, then tissue treatment effectiveness is improved, but arc formation and overcurrent damage risk increase

Engineering Contradiction:

Improveradio frequency electrical currentVSAvoidarc formation and overcurrent damage

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The system continuously monitors the actual current delivered during electrosurgery and compares it against predetermined thresholds. When arcing is detected (current exceeds threshold), the system provides feedback to reduce or terminate the current pulse, thereby suppressing arc formation while maintaining effective tissue treatment during normal operation

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the electrical current delivery based on real-time tissue conditions and detected arcing events. The current pulse is modified on-demand rather than maintained at constant high levels, allowing the system to adapt between effective tissue treatment modes and arc suppression modes

Inventive Principle:

Principle #15Dynamics

2Power

If continuous high current is supplied to ensure adequate power delivery, then tissue treatment is effective, but arc formation increases and generator damage risk increases

Engineering Contradiction:

Improvecurrent deliveryVSAvoidgenerator damage risk

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The system delivers electrical current in controlled pulses rather than continuous wave, with each pulse monitored for arcing conditions. This periodic delivery with built-in monitoring allows adequate power delivery during treatment phases while creating opportunities to detect and suppress arcing before generator damage can occur

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system establishes current thresholds and monitoring mechanisms before arcing occurs. By having predetermined safety thresholds in place and continuously monitoring current levels, the system can detect early signs of arcing and take preventive action to suppress arc formation before it causes generator damage

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If pulsed current is supplied with real-time monitoring, then arc formation is suppressed, but device complexity increases

Engineering Contradiction:

Improvearc suppressionVSAvoidmonitoring and control circuitry

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The current monitoring circuit serves multiple functions: it measures current for treatment effectiveness, detects arcing events by comparing against thresholds, and controls current delivery to suppress arcs. This multi-functionality reduces the need for separate dedicated arc detection hardware, thereby limiting the increase in device complexity while achieving effective arc suppression

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively suppresses arc formation, minimizing tissue and generator damage by regulating the duty cycle and RMS current, thereby preventing overcurrent conditions.

Implementation Method 1

Electrosurgery involves application of high radio frequency electrical current to a surgical site to cut, ablate, coagulate or seal tissue

Methodology Applied

Scientific EffectElectrical current: Conduction (electrical)

Implementation Method 2

Energy-based tissue treatment is well known in the art. Various types of energy (e.g., electrical, ohmic, resistive, ultrasonic, microwave, cryogenic, laser, etc.) are applied to tissue to achieve a desired result

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

Electrical arc formation is a discharge of current that is formed when a strong current flows through normally nonconductive media such as air (e.g., a gap in a circuit or between two electrodes)

Methodology Applied

Scientific EffectElectrical arc: Electric Arc

Data Source

PatentUS10507054B2System and method for detecting and supressing arc formation during an electrosurgical procedure

Publication Date: 2019.12.17 COVIDIEN LP

AI summary

A method for suppressing arc formation during an electrosurgical tissue treatment procedure includes the steps of supplying pulsed current from an energy source to tissue and measuring the pulsed current supplied from the energy source. The method also includes the steps of comparing an instantaneous measured pulse to a predetermined threshold and controlling the pulsed current supplied from the energy source based on the comparison between the instantaneous measured pulse and the predetermined threshold.