Phosphate-Modified PEEK Bone-Bonding Implant Material
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Solution Overview
Problem
Current medical polymer materials for implants lack excellent bone-bonding properties, tissue compatibility, and mechanical properties, particularly in spinal cages, where they fail to replicate the Young's modulus of bone and are often brittle or allergenic.
Innovation Solution
A medical polymer material with a phosphate group having a C—O—P chemical bond in the main chain, combined with a hydroxy group and optionally calcium, chemically bonded to the surface of polymers like PEEK, which enhances bone-bonding properties without being brittle or allergenic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calcium phosphate is provided on the surface of an engineering plastic, then bone-bonding property is improved, but an interface is formed between calcium phosphate and the engineering plastic with small bonding force
Solution Approach 1:
The invention merges the engineering plastic and calcium phosphate into a single-phase composite material where calcium phosphate particles are uniformly dispersed within the polymer matrix. This eliminates the problematic interface between separate materials and creates a unified structure with improved bone-bonding properties while maintaining structural integrity.
Solution Approach 2:
The invention creates a composite material system combining organic polymer components (providing mechanical properties and flexibility) with inorganic calcium phosphate components (providing bone-bonding capability). This composite approach allows both materials to contribute their advantages while avoiding the interface bonding issues of layered structures.
2Stability of the object's composition
If calcium phosphate is mixed into an engineering plastic, then separation of interface is less likely to arise, but the physical properties of the engineering plastic itself are reduced
Solution Approach 1:
The invention optimizes the particle size, concentration, and distribution of calcium phosphate within the polymer matrix. By controlling these parameters, the material achieves uniform dispersion that prevents interface separation while maintaining the mechanical properties of the base engineering plastic through proper formulation and processing conditions.
3Reliability
If the surface of an engineering plastic is made porous or concave-convex for mechanical bonding to bone, then bone-bonding is achieved, but the bonding to bone is time-consuming
Solution Approach 1:
The invention provides different surface characteristics at different scales: the bulk material maintains smooth properties for quick handling and implantation, while the micro-scale structure contains dispersed calcium phosphate particles that provide immediate chemical bonding capability. This eliminates the need for time-consuming porous structure formation while achieving both mechanical and chemical bonding.
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 material achieves excellent tissue compatibility, bone-bonding, and mechanical properties, with improved osteoconductivity and bone integration, as demonstrated by enhanced bone-bonding rates and strength in implantation studies.
Implementation Method 1
a phosphate group having a C—O—P chemical bond including elemental C in a main chain of a structural formula is present on a surface of a polymer material
Implementation Method 2
a hydroxy group having a C—O—H chemical bond including elemental C in the main chain are both present on the surface of the polymer material
Data Source
AI summary
A medical polymer material in which a phosphate group having a C—O—P chemical bond including elemental C in a main chain of a structural formula is present on a surface of a polymer material substantially free of phosphate and hydroxy groups except for ends in the structural formula.