Porous Ceramic Bone Substitute via Polyurethane Foam Template
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Solution Overview
Problem
Current ceramic and metal-based intervertebral disk replacement materials face issues such as foreign body reactions, inadequate mechanical properties, high production costs, and lack of interconnectivity for bone growth, which hinder effective osseoconduction and osseoinduction.
Innovation Solution
A method for producing porous ceramic bone substitute materials using a polyurethane foam template infiltrated with a ceramic suspension, followed by debinding and sintering, resulting in an open-pore, honeycomb-like structure that promotes osseoconduction and vascularization, with specific pore sizes and densities optimized for mechanical strength and bone integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silicon nitride ceramic is used for intervertebral disk replacement, then high-temperature properties and machining performance are improved, but mechanical strength, hardness, and long-term stability are insufficient compared to other oxidic ceramics
Solution Approach 1:
The patent changes the chemical composition parameters of the ceramic material by incorporating specific amounts of MgO (0.1-5 wt%), SiO2 (1-10 wt%), and Al2O3 (0.1-5 wt%) into the CaSiO3-based system. This compositional adjustment optimizes the balance between high-temperature resistance and mechanical strength, resolving the contradiction between thermal properties and mechanical performance.
2Temperature
If silicon nitride ceramic with needle-shaped particles and glass matrix is used, then high-temperature properties are improved, but sintering complexity and mechanical processing difficulty increase
Solution Approach 1:
The patent employs a porous foam structure as a template that is subsequently removed, creating a controlled porous architecture in the ceramic. This approach simplifies manufacturing by avoiding complex sintering of needle-shaped particles while maintaining high-temperature properties. The foam template method provides a straightforward pathway to create the desired structure without demanding mechanical processing.
3Temperature
If silicon nitride ceramic is used, then high-temperature properties are improved, but production costs increase due to complex sintering and mechanical processing
Solution Approach 1:
The patent modifies the chemical composition parameters by adding specific oxides (MgO, SiO2, Al2O3) to the CaSiO3-based ceramic system. This compositional optimization enables achieving the desired high-temperature properties and mechanical strength with simpler, more cost-effective sintering processes, thereby reducing production costs while maintaining performance.
4Temperature
If silicon nitride ceramic with gray to black coloration is used, then high-temperature properties are improved, but aesthetic acceptance in the medical field decreases
Solution Approach 1:
The patent changes the chemical composition by incorporating CaSiO3 as the base material with specific additions of MgO, SiO2, and Al2O3. This compositional modification results in a lighter coloration that is more aesthetically acceptable in the medical field while preserving the high-temperature properties required for the application.
5Strength
If dense monolithic ceramic material is used for the cage structure, then mechanical strength is improved, but osseoconduction and bone growth promotion are reduced
Solution Approach 1:
The patent utilizes a porous foam structure as a template that is removed to create an interconnected pore network within the ceramic. This porous architecture provides osseoconductive pathways for bone growth while the surrounding dense ceramic shell maintains mechanical strength, effectively resolving the contradiction between structural integrity and biological functionality.
6Adaptability or versatility
If polyurethane foam template with CVD tantalum deposition is used, then porous interconnecting structures for bone growth are created, but production complexity and cost increase
Solution Approach 1:
The patent employs a polyurethane foam template that is intentionally designed to be temporary and disposable. The foam is used solely as a sacrificial template during manufacturing to create the porous structure, then completely removed through combustion. This approach simplifies production by eliminating the need for expensive and complex CVD tantalum deposition processes, achieving osseoconductive structures through a more economical route.
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 produces ceramic bone substitute materials with enhanced mechanical strength, interconnectivity, and osseoconductive properties, enabling effective bone growth and integration while reducing production costs and aesthetic concerns.
Implementation Method 1
infiltrating the foam with the ceramic infiltrate suspension
Implementation Method 2
burning out the foam
Implementation Method 3
sintering
Data Source
AI summary
A method for producing a ceramic osseoconductive bone substitute material, the bone substitute material, intervertebral disk implants containing the substitute bone material, and to methods of using the bone substitute material.