Electrosurgical Dissector Thermal Management

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Solution Overview

Problem

Existing electrosurgical systems face challenges in controlling and directing the release of thermal energy during procedures, leading to inefficiencies in tissue dissection and cauterization, particularly in the storage and deposition of thermal energy by electrosurgical pencils.

Innovation Solution

An electrosurgical dissection apparatus featuring a thermally insulating body with a thermally conductive insert, where the active electrode is disposed on the insert and spaced from a return electrode by the insulating body, allowing for controlled release of thermal energy into tissue, utilizing materials like copper, silver, gold, amorphous polyamide, and alumina for efficient energy storage and transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the electrosurgical pencil body is made of thermally conductive material to store and transmit thermal energy, then thermal energy storage and transmission efficiency is improved, but uncontrolled thermal energy release to surrounding tissue occurs causing thermal damage

Engineering Contradiction:

Improvethermal energy storage and transmissionVSAvoiduncontrolled thermal damage to tissue

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The electrosurgical pencil body incorporates a thermally conductive insert only at the distal end where the active electrode is located, rather than making the entire body thermally conductive. This localized thermal conductivity allows thermal energy to be stored and transmitted efficiently at the treatment site while the proximal portion of the body remains thermally insulating, preventing uncontrolled thermal release to surrounding tissue and resolving the contradiction between thermal energy storage efficiency and thermal safety.

Inventive Principle:

Principle #3Local quality

2Productivity

If the active electrode is placed in close proximity to the return electrode to form an electrical circuit, then electrosurgical dissection effectiveness is improved, but thermal energy concentration increases causing excessive tissue heating

Engineering Contradiction:

Improvetissue dissection effectivenessVSAvoidtissue heating temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The thermally conductive insert acts as an intermediary between the active electrode and the surrounding tissue. It absorbs and stores thermal energy generated during electrosurgical dissection, then releases it in a controlled manner to the tissue, preventing excessive temperature concentration while maintaining effective tissue dissection. This mediator approach resolves the contradiction between dissection effectiveness and temperature control.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of energy

If the electrosurgical pencil body is made of thermally insulating material to prevent thermal energy loss, then thermal energy efficiency is improved, but thermal energy storage capacity decreases reducing cauterization effectiveness

Engineering Contradiction:

Improvethermal energy lossVSAvoidthermal energy storage capacity

Core Design Contradiction:

Loss of energyVSUse of energy by moving object

Solution Approach 1:

The electrosurgical pencil body uses a composite structure combining thermally insulating material for the main body with a thermally conductive insert at the distal end. The insulating material prevents thermal energy loss from the proximal portion, while the conductive insert provides thermal energy storage capacity at the treatment site. This composite approach resolves the contradiction between thermal energy efficiency and storage capacity.

Inventive Principle:

Principle #40Composite materials

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

The solution enables precise and controlled tissue dissection and cauterization, minimizing fluid loss and maintaining tissue integrity through the selective storage and release of thermal energy, enhancing the effectiveness of electrosurgical procedures.

Implementation Method 1

The thermally conductive insert is configured to cauterize tissue dissected by radiofrequency energy passing from the at least one active electrode to the at least one return electrode

Methodology Applied

Scientific EffectThermal energy storage and release: Thermal Energy Storage

Implementation Method 2

a thermally conductive insert... allowing for controlled release of thermal energy into tissue

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

a thermally insulating body... spaced from the at least one active electrode by a portion of the thermally insulating body

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS10888368B2Electrosurgical dissector with thermal management

Publication Date: 2021.01.12 COVIDIEN LP

AI summary

An electrosurgical dissection apparatus is disclosed, and includes a thermally insulating body, a thermally conductive insert, at least one active electrode, and at least one return electrode. The at least one active electrode is disposed on the thermally conductive insert, and the at least one return electrode is spaced from the at least one active electrode by a portion of the thermally insulating body. The thermally conductive insert is configured to cauterize tissue dissected by radiofrequency energy passing from the at least one active electrode to the at least one return electrode.