Electrosurgical Generator Voltage Ramping for Impedance-Based Coagulation

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Solution Overview

Problem

Existing electrosurgical generators face challenges in controlling the application of energy to prevent tissue dissection while ensuring effective coagulation, as excessive energy can lead to tissue destruction and insufficient energy can hinder surgical procedures.

Innovation Solution

An electrosurgical generator adjusts voltage ramp rates based on load impedance thresholds to control energy delivery, decreasing voltage when impedance is high and increasing it when low, using a processor and memory to manage energy delivery to instruments in coagulation mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If excessive electrosurgical energy is applied to achieve effective coagulation, then coagulation effectiveness is improved, but tissue dissection and destruction occur

Engineering Contradiction:

Improvecoagulation effectivenessVSAvoidtissue dissection

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The electrosurgical generator dynamically adjusts the voltage ramp rate based on real-time load impedance feedback. The system transitions from static energy delivery to dynamic control, where the ramp rate is continuously modified according to tissue conditions to maintain optimal coagulation while preventing dissection

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback control by monitoring load impedance and using this information to adjust the voltage ramp rate. The generator receives impedance signals from the instrument, processes this feedback, and modifies energy delivery accordingly to achieve effective coagulation without excessive energy application

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If insufficient electrosurgical energy is applied to avoid tissue dissection, then tissue destruction is prevented, but coagulation effectiveness is reduced

Engineering Contradiction:

Improvetissue destructionVSAvoidcoagulation effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The system dynamically adjusts energy delivery to match actual tissue conditions. Rather than using fixed low energy levels that may be insufficient, the generator adapts the ramp rate in real-time to ensure adequate coagulation energy is applied when needed while avoiding excessive energy that could cause dissection

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the voltage ramp rate parameter based on load impedance conditions. By adjusting this critical parameter dynamically, the system optimizes energy delivery to achieve effective coagulation without causing tissue dissection or destruction

Inventive Principle:

Principle #35Parameter changes

3Productivity

If high voltage ramp rate is used to quickly achieve coagulation, then treatment time is reduced, but tissue dissection risk increases

Engineering Contradiction:

Improvetreatment timeVSAvoidtissue dissection

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The voltage ramp rate is made dynamic rather than fixed. The system adjusts the ramp rate in real-time based on load impedance feedback, allowing for optimized treatment speed that adapts to tissue conditions to prevent dissection while maintaining productivity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Real-time load impedance feedback controls the voltage ramp rate adjustment. The generator monitors impedance changes and modifies the ramp rate accordingly, preventing excessive voltage increases that would cause dissection while maintaining efficient treatment progression

Inventive Principle:

Principle #23Feedback

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 effectively prevents tissue dissection during coagulation by dynamically adjusting voltage, ensuring consistent coagulation without excessive energy application.

Implementation Method 1

the instrument can be used for cutting, coagulation, or sealing the tissue of a patient with high frequency electrical energy. During operation, electrical current from the generator flows between an active electrode and a return electrode of the instrument by passing through tissue and bodily fluids of a patient

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20250228603A1Systems and methods for controlled electrosurgical coagulation

Publication Date: 2025.07.17 COVIDIEN LP

AI summary

The present disclosure includes an electrosurgical generator that controls treatment energy to be provided in a coagulation mode, where the treatment energy has an adjustable voltage ramp rate which can be set to a ramp rate in a range of voltage ramp rates. The generator receives signals from an instrument over time relating to load impedance. When the load impedance is above a threshold, the generator sets the adjustable voltage ramp rate to a ramp rate in the range of voltage ramp rates, and decreases, at the adjustable voltage ramp rate, a voltage of the treatment energy. When the load impedance is below the threshold, the generator sets the adjustable voltage ramp rate to a ramp rate in the range of voltage ramp rates, and increases, at the adjustable voltage ramp rate, the voltage of the treatment energy.