Multi-phase Ceramic Composite for Hip Joint Wear Reduction

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Solution Overview

Problem

Current artificial hip joint materials, such as metal-on-polyethylene and metal-on-metal combinations, face issues like wear particle-induced inflammation, metallic ion toxicity, and squeaking noise, which lead to implant failure and increased revision surgeries, while ceramic-on-ceramic combinations are brittle and prone to fracture and noise.

Innovation Solution

Development of multi-phase ceramic composites with a hard wear-resistant phase and a lubricating phase, such as Al2O3-GdAlO3, which exhibit superior wear resistance and low friction coefficients, reducing the need for revision surgeries and mitigating squeaking noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ceramic-on-ceramic combinations are used, then wear resistance and biocompatibility are improved, but brittleness and susceptibility to fracture increase

Engineering Contradiction:

Improvewear resistanceVSAvoidbrittleness

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies composite materials by combining multiple ceramic phases (e.g., alumina and gadolinium gallium oxide) to create a material that exhibits both wear resistance and improved toughness. The composite structure allows the hard phase to provide wear resistance while the matrix phase provides toughness and fracture resistance, resolving the contradiction between wear resistance and brittleness.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If metal-on-polyethylene combinations are used, then ease of manufacture is improved, but wear particle-induced inflammation and osteolysis occur

Engineering Contradiction:

ImprovemanufacturabilityVSAvoidwear particle-induced inflammation

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material parameter from metal-polyethylene combination to multi-phase ceramic composite, fundamentally altering the wear characteristics. This parameter change eliminates the generation of inflammatory wear particles while maintaining manufacturability through established ceramic processing techniques such as slip casting and sintering.

Inventive Principle:

Principle #35Parameter changes

3Strength

If metal-on-metal combinations are used, then strength and durability are improved, but metallic ion toxicity and adverse effects increase

Engineering Contradiction:

ImprovedurabilityVSAvoidmetallic ion toxicity

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material parameter from metal to ceramic composite, eliminating the source of metallic ion toxicity. The ceramic material provides comparable strength and durability without releasing harmful ions into the biological environment, thus resolving the contradiction between durability and toxicity.

Inventive Principle:

Principle #35Parameter changes

4Object-affected harmful factors

If ceramic-on-ceramic combinations are used, then biocompatibility is improved, but squeaking noise occurs

Engineering Contradiction:

ImprovebiocompatibilityVSAvoidsqueaking noise

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by creating regions with different properties within the ceramic composite. The lubricating phase is distributed locally throughout the material, providing low-friction surfaces that prevent squeaking while maintaining the overall biocompatibility of the ceramic material.

Inventive Principle:

Principle #3Local quality

5Reliability

If hard wear-resistant phase is used, then wear resistance is improved, but friction coefficient increases

Engineering Contradiction:

Improvewear resistanceVSAvoidfriction coefficient

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The patent uses composite materials to combine a hard wear-resistant phase with a lubricating phase. The hard phase provides wear resistance while the lubricating phase reduces friction, resolving the contradiction between wear resistance and friction coefficient through synergistic material combination.

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 multi-phase ceramic composites demonstrate a tenfold reduction in friction coefficient and sixfold reduction in wear, improving biocompatibility and arthroplasty life, and significantly reducing wear debris, thus enhancing joint function and preventing bone destruction.

Implementation Method 1

a microstructure of the multi-phase ceramic composite containing a hard(wear) phase with a lubricating phase

Methodology Applied

Scientific EffectLubrication: Lubrication

Implementation Method 2

The wear properties of a multi-phase ceramic composite is superior that of the individual constituents due to a microstructure of the multi-phase ceramic composite containing a hard(wear) phase

Methodology Applied

Scientific EffectWear resistance: Wear

Data Source

PatentUS10501373B1Multi-phase ceramic system

Publication Date: 2019.12.10 UNITED STATES GOVERNMENT ADMINISTRATOR OF NASA

AI summary

Systems, methods, and other embodiments associated with multi-phase ceramic composites are described herein. Specifically, a multi-phase ceramic composite having a microstructure having at least one solid-state lubricant phase and at least one wear resistant material phase.