Metal-Ceramic Composite Joint Prosthesis with Root-like Filament Structure
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Solution Overview
Problem
Current artificial joint implants face challenges in achieving both low wear resistance for joint friction surfaces and effective bone ingrowth for osseointegration, as ceramic materials are difficult to make porous and metal surfaces lack the wear resistance of ceramics.
Innovation Solution
A metal-ceramic composite joint prosthesis is developed, featuring a ceramic joint friction surface and a porous metal osseointegration interface with a root-like filament structure, where the ceramic body covers the root-like filament clusters and is bonded to a tantalum metal body, ensuring both wear resistance and bone ingrowth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic material is used for the joint friction surface, then wear resistance is improved, but the material cannot achieve bone ingrowth and cannot be made porous
Solution Approach 1:
The prosthesis is divided into two distinct functional zones: a ceramic joint friction surface for wear resistance and a porous metal osseointegration interface for bone ingrowth. This segmentation allows each material to perform its specialized function without compromise
Solution Approach 2:
The invention creates a composite structure combining ceramic and porous metal materials in a single prosthesis. The ceramic body provides the friction surface while the porous metal body provides the osseointegration interface, achieving both wear resistance and bone ingrowth capability
2Adaptability or versatility
If a metal material is used for the joint friction surface, then bone ingrowth is achieved through porous structure, but wear resistance is insufficient
Solution Approach 1:
The prosthesis is divided into two distinct functional zones: a ceramic joint friction surface for wear resistance and a porous metal osseointegration interface for bone ingrowth. This segmentation allows each material to perform its specialized function without compromise
Solution Approach 2:
The invention creates a composite structure combining ceramic and porous metal materials in a single prosthesis. The ceramic body provides the friction surface while the porous metal body provides the osseointegration interface, achieving both wear resistance and bone ingrowth capability
3Reliability
If a ceramic body is formed over root-like filament clusters, then the ceramic body is prevented from cracking, but manufacturing complexity increases
Solution Approach 1:
The root-like filament clusters form a porous metal structure that allows the ceramic body to be formed over it. This porous structure accommodates thermal expansion differences and prevents ceramic cracking during cooling
Solution Approach 2:
The root-like filament clusters act as an intermediary structure between the ceramic body and the metal body, facilitating stress distribution and preventing direct thermal shock to the ceramic
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 composite prosthesis reduces wear on the joint friction surface while facilitating bone integration, providing a stable and durable implant with improved load distribution and reduced risk of ceramic cracking due to thermal expansion matching and ductility of the metal body.
Implementation Method 1
a surface of a porous metal has a good bone ingrowth effect, and permits human bone cell tissue to easily grow into pores inside the porous material
Implementation Method 2
a ceramic interface serving as a joint friction surface on one or even two sides of a friction pair can effectively reduce wear of an articular surface
Data Source
AI summary
The present invention discloses a metal-ceramic composite joint prosthesis and applications and a manufacturing method thereof. The joint prosthesis comprises a metal body and a ceramic body, wherein the metal body is integrally formed and comprises a porous structure layer, a boundary layer and a root-like layer, the boundary layer is located between the porous structure layer and the root-like layer, the root-like layer comprises a plurality of root-like filament clusters connected to the boundary layer but not in contact with one another, each root-like filament cluster comprises a main root perpendicularly connected to the boundary layer and a plurality of fibrous roots connected to the lateral side of the main root, the fibrous roots extend obliquely towards the side away from the boundary layer, and the ceramic body covers the root-like filament clusters and is formed on the boundary layer. The joint prosthesis achieves the compositing of metal and ceramic, thereby achieving both a wear-resistant ceramic body required for a joint friction surface and a porous metal structure with a good bone ingrowth effect required for an osseointegration surface. The root-like filament clusters of the root-like layer are rooted in the ceramic body, to form a tight and stable connection between the ceramic body and the metal body, and the root-like clusters being not in contact with one another prevents the ceramic body from locally breaking or cracking.