PEEK Implant Double Titanium Coating for Bone Integration
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Solution Overview
Problem
Current PEEK implants lack sufficient bone integration, leading to instability and the need for additional surgeries, as they do not adequately adhere to human or animal bones, and existing coatings like hydroxylapatite do not provide sufficient tensile strength and resistance to shearing forces.
Innovation Solution
A double coating comprising a dense adhesion promoter layer and an osteointegrative layer of pure titanium, with specific thicknesses and porosity, applied to selected surface sections of a PEEK implant main body, enhancing bone adhesion and stability through improved surface roughness and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PEEK material is used for implant main body, then elastic modulus matches cortical bone and X-ray permeability is improved, but bone adhesion and integration are insufficient
Solution Approach 1:
The implant combines PEEK material with a titanium coating layer to create a composite structure. The PEEK provides biocompatibility and X-ray permeability, while the titanium coating enhances bone adhesion and integration, resolving the contradiction between material advantages and bone integration deficiencies
Solution Approach 2:
The titanium coating is designed with porous structure and specific roughness to facilitate bone ingrowth and improve mechanical interlocking. The porous morphology increases surface area and provides pathways for bone cells to penetrate and integrate with the implant, thereby enhancing bone adhesion strength
2Reliability
If hydroxylapatite coating is applied to improve bone growth, then bone integration is enhanced, but tensile strength and resistance to shearing forces are insufficient
Solution Approach 1:
The coating combines hydroxylapatite with titanium to create a composite coating structure. Hydroxylapatite promotes osteointegration and bone growth, while the titanium substrate provides mechanical strength and resistance to shearing forces, achieving both bone integration and mechanical durability
Solution Approach 2:
The coating is applied selectively to specific surface sections of the implant where bone contact is required. This localized application ensures that the bone-integrative properties are concentrated at the implant-bone interface, while maintaining the overall structural integrity of the implant
3Strength
If coating is applied to entire surface of implant, then bone adhesion is maximized, but manufacturing complexity and cost increase
Solution Approach 1:
The coating is applied selectively to specific surface sections of the implant where bone contact is required, rather than the entire surface. This localized approach reduces coating material consumption, simplifies the manufacturing process, and decreases production costs while maintaining effective bone adhesion at critical interfaces
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 double coating significantly increases tensile strength and resistance to shearing forces, ensuring long-term implant stability and bone integration, reducing the need for additional surgeries and improving patient outcomes.
Implementation Method 1
a) applying a mask to the implant main body, wherein the mask comprises dimensions and recesses, such that the at least one calculated and defined surface section is exposed
Implementation Method 2
b) applying the at least one surface section to be coated with a blasting material, in order to cause roughening of the surface section
Implementation Method 3
c) coating the roughened surface section with a very dense adhesion promoter layer of pure titanium
Data Source
AI summary
An implant is provided with a main body (1) and with a double coating applied to at least one surface section of the main body (1), wherein the double coating comprises an adhesion promoter layer (2), applied directly to the at least one surface section of the main body, and of an osteointegrative layer (3) covering the adhesion promoter layer (2). The layers (2;3) consist of pure titanium, wherein the adhesion promoter layer (2) has a thickness of 2-6 μm, in particular a thickness of 3-5 μm, and the osteointegrative layer (3) has a thickness of 50-70 μm, in particular of 55-65 μm. Moreover, the osteointegrative layer (3) has a porosity of 70-90% and a roughness Rz of at least 45 μm. A related method is also provided for producing such an implant.