ZrO2 Coating for Electrosurgical Device Insulation

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Solution Overview

Problem

Existing electrosurgical devices face challenges in achieving reliable electrical insulation, particularly in preventing electrical shock to surgeons and patients, with current methods being complex and costly, such as thermal spray techniques using Al2O3 coatings.

Innovation Solution

A coating system comprising a layer of zirconium dioxide (ZrO2) deposited via arc evaporation or magnetron sputtering techniques, including a zirconium nitride interlayer, providing dielectric insulation with specific properties like a dielectric constant of 18.4 and high voltage breakdown, applied using methods like reactive arc ion plating and high power impulse magnetron sputtering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermal spray techniques using Al2O3 coatings are used for electrical insulation, then insulation performance is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveelectrical insulation performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the material parameter from Al2O3 to ZrO2 and the deposition method from thermal spray to PVD techniques. ZrO2 provides comparable or superior dielectric properties (dielectric constant of 18.4) while being more compatible with PVD processes, thereby reducing manufacturing complexity and cost while maintaining insulation performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the thermal spray process with PVD (physical vapor deposition) techniques such as arc evaporation or magnetron sputtering. This substitution allows for better control of coating properties, simpler equipment requirements, and reduced manufacturing complexity while achieving the same electrical insulation function

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If existing coating methods are used to prevent electrical shock, then insulation is provided, but wear resistance and sliding properties are insufficient

Engineering Contradiction:

Improveelectrical insulationVSAvoidwear resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent employs a multi-layer composite coating structure consisting of a ZrO2 layer deposited by PVD techniques. This composite approach combines the high dielectric strength of ZrO2 with the advantages of PVD deposition to achieve both superior electrical insulation and enhanced wear resistance and sliding properties that single-layer coatings cannot provide

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If insulation coatings are applied to electrosurgical devices, then electrical shock prevention is improved, but coating application complexity increases

Engineering Contradiction:

Improveelectrical shock riskVSAvoidcoating application simplicity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent replaces complex thermal spray or polymer coating processes with PVD techniques. PVD allows for simpler, more controlled deposition processes that can be applied in vacuum environments, reducing the number of process steps and simplifying manufacturing while providing reliable electrical insulation to prevent electrical shock

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

The ZrO2 coating system offers superior wear resistance and sliding properties, ensuring effective electrical insulation for electrosurgical devices, outperforming traditional methods like heat-shrink tubing and polymer over moulding, while being simpler and more cost-effective to apply.

Implementation Method 1

at least one layer of zirconium dioxide, ZrO2, deposited by means of arc evaporation PVD techniques

Methodology Applied

Scientific EffectArc evaporation: Arc Evaporation

Implementation Method 2

deposited by means of arc evaporation PVD techniques or magnetron sputtering PVD techniques

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Implementation Method 3

magnetron sputtering PVD techniques

Methodology Applied

Scientific EffectMagnetron sputtering: Sputtering

Implementation Method 4

deposited by means of arc evaporation PVD techniques or magnetron sputtering PVD techniques

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Implementation Method 5

including a zirconium nitride interlayer

Methodology Applied

Scientific EffectReactive sputtering: Sputtering

Data Source

PatentEP2999806B1Coating system comprising zro2 for electrosurgical devices

Publication Date: 2020.11.18 OERLIKON SURFACE SOLUTIONS AG PFAFFIKON

AI summary

The present invention relates to a coating system comprising at least one layer made at least essentially of ZrO2 which is used for providing insulating properties to parts o medical devices particularly of electrosurgical devices.