Capacitive Return Electrode Connection for Electrosurgical Safety

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Solution Overview

Problem

Conventional electrical connections between electrosurgical return electrodes and cables are prone to short-circuiting due to fluid exposure, are difficult to clean and sterilize, and lack adaptability in surgical scenarios, posing safety and infection risks.

Innovation Solution

A capacitive electrical connection system for electrosurgical return electrodes that eliminates external plugs and hard-wired connections, using a conductive element completely encompassed by pads to form a reconfigurable capacitive connection with a return conductor, allowing for flexible placement and easy disinfection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrical plugs or hard-wired connections are used between return electrode and cable, then electrical connection is established, but fluid can flow into connection causing short-circuit and safety hazards

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidfluid exposure risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical electrical plug connection with a capacitive coupling system. The return conductor forms a capacitive connection with the conductive element, eliminating physical openings that could allow fluid ingress. This non-contact electrical connection maintains reliability while preventing fluid-induced short-circuits.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a dielectric barrier between the conductive element and return conductor, creating a capacitive coupling that acts as an intermediary. This dielectric layer prevents direct fluid contact while allowing electrical signal transmission, thus blocking the harmful fluid exposure pathway.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conventional electrical plugs or hard-wired connections are used, then electrical connection is established, but connection is difficult to clean and sterilize, increasing infection risk

Engineering Contradiction:

Improveelectrical connection functionalityVSAvoidcleanability and sterilization

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By replacing the mechanical plug with a capacitive coupling system, the patent eliminates complex internal geometries and crevices that are difficult to clean. The simplified surface structure of the capacitive connection allows for easier wiping and sterilization, reducing infection risk while maintaining electrical functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If return electrode connection position is predetermined, then electrical connection is stable, but adaptability to different surgical scenarios is reduced

Engineering Contradiction:

Improveconnection stabilityVSAvoidsurgical scenario adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent enables dynamic repositioning of the return conductor on the return electrode surface while maintaining stable capacitive coupling. The flexible placement capability allows adaptation to different surgical scenarios and patient positions without compromising connection reliability, as the capacitive connection remains effective across various configurations.

Inventive Principle:

Principle #15Dynamics

4Reliability

If conventional electrical connections are used, then electrical return is provided, but connection may corrode or wear down over time

Engineering Contradiction:

Improveelectrical return functionalityVSAvoidconnection lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent replaces mechanical electrical contacts that are susceptible to corrosion and wear with a capacitive coupling system. The non-contact nature of capacitive coupling eliminates friction and chemical degradation pathways, significantly extending the operational lifespan of the electrical connection while maintaining reliable return functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enhances safety by preventing fluid-induced short-circuits, reduces infection risk through improved cleanability, and increases operational flexibility by allowing the return electrode to be positioned freely within the operating room without compromising functionality.

Implementation Method 1

The return conductor forms a capacitive electrical connection with the conductive element

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12064171B2Electrical return connections for electrosurgical systems

Publication Date: 2024.08.20 MEGADYNE MEDICAL PRODUCTS INC

AI summary

An electrosurgical system comprises a return electrode that includes a conductive element and a return conductor that forms a capacitive electrical connection with the conductive element. The conductive element is completely encompassed by one or more pads so that the conductive element is not exposed and so that the return electrode does not include an externally exposed electrical connection.