Microgrooved Titanium Implant Coated with Electrospun Nanofibers
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Solution Overview
Problem
Current metal implants for joint arthroplasty and dental surgeries face issues with poor osseointegration due to inadequate adhesion of polycaprolecton electrospun nanofibers (PCL ENF) to implant surfaces, leading to implant loosening and delayed bone healing, resulting in significant medical and economic burdens.
Innovation Solution
A method involving the creation of microgrooves and titanium nitride (TiN) ridges on titanium implants, combined with a polycaprolactone (PCL) electrospun nanofiber matrix (ENF) and collagen (CG) coating, enhances adhesion and osseointegration by increasing surface area contact and mechanical stability, using techniques like machine sawing and plasma nitride deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PCL electrospun nanofibers are applied as a coating around the implant, then bone growth is improved, but adhesion to implant surface deteriorates
Solution Approach 1:
The implant surface is segmented into microgrooves that divide the continuous surface into discrete channels, creating localized regions that enhance fiber attachment and distribution while maintaining overall structural integrity
Solution Approach 2:
The microgroove structure creates localized variations in surface topology, concentrating the nanofiber coating in specific regions where it is most needed for adhesion, while allowing other areas to maintain different properties
Solution Approach 3:
The coating system combines PCL electrospun nanofibers with collagen and incorporates them into a microgrooved titanium substrate, creating a composite structure that integrates multiple materials to achieve both adhesion and bone growth promotion
2Reliability
If microgrooves and TiN ridges are created on implant surface, then adhesion and osseointegration are improved, but manufacturing complexity increases
Solution Approach 1:
The microgrooves and TiN ridges are created on the implant surface before nanofiber coating application, preparing the surface in advance to enhance subsequent adhesion and osseointegration
Solution Approach 2:
TiN ridges serve as an intermediary layer between the titanium implant surface and the PCL nanofiber coating, facilitating adhesion and promoting osseointegration
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 significantly improves mechanical stability and osseointegration of titanium implants by enhancing the bonding between the implant and bone tissue, reducing implant loosening and promoting bone growth, as demonstrated by increased shear strength and bone tissue integration.
Implementation Method 1
polycaprolecton (PCL) electrospun nanofibers
Implementation Method 2
plasma nitride deposition
Data Source
AI summary
The present invention implements a set of grooves/ridges created on Ti at the circumferential direction to increase surface area of implant in contact with bone. These grooves/ridges protect nanofiber matrix (NFM) made with Polycaprolactone (PCL) electrospun nanofiber (ENF) and collagen at the groove from physiological loading. Controlled fabrication of a ridge made with titanium nitride (TiN) around the circumference of Ti is provided using a plasma nitride deposition technique. PCL ENF may be deposited along the sub-micrometer grooves using the electrospin setup disclosed. The method provides for fabrication of microgroove on Ti using machining or TiN deposition and filling the microgrooves with the NFM. This method has proven through experimentation to be successful in increasing in vivo mechanical stability and promoting osseointegration on Ti implants. The immobilization of MgO NP and FN with the PCL-CG NFM on microgrooved Ti as provided in the invention optimizes biological performances of Ti.