Porous Ceramic Implant Coating via Polymer-Ceramic Sintering
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Solution Overview
Problem
Existing methods for producing porous ceramic surface layers on implants are limited in their ability to achieve predefined porosity and roughness, which is crucial for creating a strong mechanical bond between the implant and bone tissue, and are mainly applicable to bioceramic materials.
Innovation Solution
A method involving a mixture of polymer and ceramic materials applied directly to a substrate, followed by a sintering process, to create a porous ceramic surface layer with controlled porosity and roughness, utilizing a dispersion that includes a solvent and inorganic binder for optimal adhesion and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sandblasting and etching processes are used to create pores on the implant surface, then mechanical strength of the bone-implant connection is improved, but the process complexity and manufacturing difficulty increase
Solution Approach 1:
The porous surface layer is created as a separate coating layer on top of the implant substrate, rather than modifying the substrate itself. This segmentation allows the porous structure to be formed independently through the application and sintering of a ceramic slurry containing pore-forming agents, simplifying the overall manufacturing process while achieving the desired mechanical interlocking with bone tissue.
Solution Approach 2:
The invention changes the physical and chemical parameters of the surface layer by applying a ceramic slurry with specific composition (containing pore-forming agents like hollow spheres or foams) and then sintering it at controlled temperatures. This transforms the surface from a dense state to a porous state with controlled porosity (30-70%), achieving mechanical strength without complex mechanical processing.
2Strength
If a porous surface layer is applied to enhance mechanical bond strength, then the connection between implant and bone tissue is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Pore-forming agents act as intermediaries in the ceramic slurry that create the porous structure during sintering. These agents (hollow spheres, foams, or other pore-forming materials) are temporarily introduced to define the pore geometry and are then removed or transformed during sintering, leaving behind the desired porous structure with controlled porosity and surface roughness that enhances mechanical bond strength.
3Reliability
If ceramic material is applied directly to the substrate, then adhesion and biocompatibility are improved, but the application process complexity increases
Solution Approach 1:
The invention uses a composite ceramic slurry containing ceramic particles, pore-forming agents, and binding materials that can be applied directly to the implant substrate. This composite formulation allows the porous surface layer to be formed in a single application and sintering step, improving adhesion through direct contact with the substrate while maintaining biocompatibility through the use of appropriate ceramic 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 method enables the formation of a biocompatible porous ceramic surface layer with predefined porosity and roughness, enhancing the mechanical strength of the bond between the implant and bone tissue, and can be applied to various implant materials, including ceramic and technical ceramics.
Implementation Method 1
A porous, ceramic surface layer is a layer that has a ceramic composition with a predefined porosity and roughness in order to enable 'interlocking' of regrowing tissue with an implant
Implementation Method 2
The application can preferably be carried out directly. Direct application means that the mixture is applied directly to the substrate and to the substrate without intermediate layers
Data Source
Figure 1~2
AI summary
The present invention provides a method for the production of a porous, ceramic surface layer (10) on a substrate (1), wherein the method comprises the step of applying a mixture to the substrate (1), wherein the mixture comprises a polymer, and at least one ceramic material.