Multi-layered Ceramic Prosthetic Construct with Compressive Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing artificial joints prematurely fail due to clinical loads, leading to particle breakage and contamination of surrounding tissue, which can cause osteolysis and mechanical loosening, and the failure mode often results in sharp shards that can cause injury or pain.
Innovation Solution
A multi-layered prosthetic construct using ceramic components with a compressive stress mechanism to offset clinical loads, where one ceramic component induces a compressive force on another, potentially forming non-sharp or radio-opaque shards upon failure, and a membrane can be used to reinforce the ceramic components and prevent fracture migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single ceramic component is used in artificial joints, then the wear resistance is improved, but the fracture risk increases under clinical loads
Solution Approach 1:
The ceramic component is divided into multiple layers (first ceramic layer, second ceramic layer, and optionally third ceramic layer), each with different material properties and functions. The first layer provides wear resistance, the second layer provides fracture toughness, and the third layer (if present) provides compressive stress to prevent crack propagation. This segmentation allows each layer to optimize for its specific function while working together as an integrated component.
Solution Approach 2:
The invention uses composite ceramic structures where different ceramic materials are combined in a layered configuration. Each ceramic layer has distinct mechanical properties - the first layer is optimized for wear resistance while the second layer is optimized for fracture toughness. This composite approach allows the component to simultaneously achieve both wear resistance and fracture resistance that cannot be obtained with a single ceramic material.
2Reliability
If ceramic components are made harder to reduce wear, then wear resistance is improved, but the likelihood of fracture increases
Solution Approach 1:
The ceramic component is divided into multiple layers (first ceramic layer, second ceramic layer, and optionally third ceramic layer), each with different material properties and functions. The first layer provides wear resistance, the second layer provides fracture toughness, and the third layer (if present) provides compressive stress to prevent crack propagation. This segmentation allows each layer to optimize for its specific function while working together as an integrated component.
Solution Approach 2:
Different regions of the ceramic component have different material properties optimized for their specific functions. The first layer near the articulating surface has high hardness and wear resistance, while the second layer beneath it has higher toughness and lower hardness to absorb impact energies and prevent fracture. This local differentiation of material properties allows the component to simultaneously achieve wear resistance and fracture resistance.
3Object-affected harmful factors
If ceramic components fail under clinical loads, then particle breakage occurs contaminating surrounding tissue, but using softer materials reduces this risk
Solution Approach 1:
The ceramic component is divided into multiple layers (first ceramic layer, second ceramic layer, and optionally third ceramic layer), each with different material properties and functions. The first layer provides wear resistance, the second layer provides fracture toughness, and the third layer (if present) provides compressive stress to prevent crack propagation. This segmentation allows each layer to optimize for its specific function while working together as an integrated component.
Solution Approach 2:
The second ceramic layer is positioned beneath the first layer to act as a cushioning layer that absorbs impact energies and prevents crack propagation before cracks can reach the articulating surface. This beforehand cushioning prevents catastrophic failure and particle generation by stopping crack propagation in its early stages, protecting the wear-resistant first layer from fracture.
4Object-affected harmful factors
If ceramic components are designed to be more fracture-resistant, then safety is improved, but the ability to detect failure through imaging may be reduced
Solution Approach 1:
The third ceramic layer is designed with radio-opaque properties that allow it to be detected by imaging devices such as X-rays. This layer acts as a visible indicator that remains attached to the component even when other layers fail. The radio-opaque characteristic provides a visual marker that helps clinicians detect component presence and potential failure modes through standard imaging techniques.
Solution Approach 2:
The third ceramic layer serves as an intermediary indicator layer that mediates between the structural ceramic layers and the imaging detection system. It provides a radio-opaque signal that allows imaging devices to detect the component's status without directly imaging the ceramic-material interfaces or crack patterns, thus enabling failure detection while maintaining the structural integrity and fracture resistance of the overall component.
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-layered ceramic construct increases the strength and toughness of the prosthetic joint, changes the failure mode to a more benign outcome, and reduces the risk of further injury by keeping shards together, making them detectable by imaging devices.
Implementation Method 1
one ceramic component induces a compressive stress on another ceramic component that can offset a clinical load on the combined ceramic components and can make fracture of the prosthetic construct less likely
Implementation Method 2
heating the first ceramic material and the second ceramic material, and cooling the first and second ceramic components so that the second ceramic component induces a compressive stress on the first ceramic component
Data Source
AI summary
Multi-layered prosthetic constructs, kits, and methods are disclosed. A prosthetic construct can include a first ceramic component having a first surface, the first ceramic component comprising a first ceramic material, and a second ceramic component having a second surface disposed on the first surface of the first ceramic component, the second ceramic component comprising a second ceramic material. The second ceramic material of the second ceramic component can exert a compressive force on the first ceramic material. A ceramic material of the second ceramic component can include a different coefficient of thermal expansion than a ceramic material of the first ceramic component. Optionally, a ceramic construct can include a ceramic component and a membrane disposed onto and bonded to at least a portion of the ceramic component, the membrane configured to provide fracture reinforcement to the ceramic component.