Collagen Nanofiber Coating for Controlled Antibiotic Release
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Solution Overview
Problem
Current orthopaedic and dental implants face challenges with bioinert metal surfaces that lack osteointegration and require additional surgeries for antibiotic delivery, as existing bioactive coatings suffer from non-controlled antibiotic release and cytotoxicity issues.
Innovation Solution
A bioactive nanocomposite layer composed of collagen type I nanofibers and hydroxyapatite nanoparticles, created through electrospinning and electroblowing, is developed for efficient antibiotic impregnation, ensuring controlled release and biocompatibility by minimizing poly(ethylene oxide content and using crosslinking agents like EDC and NHS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antibiotics are delivered through additional surgeries, then antibiotic delivery is achieved, but patient comfort deteriorates and costs increase
Solution Approach 1:
Antibiotics are pre-loaded into the collagen nanofiber matrix during the coating process, so that the implant is ready for controlled antibiotic release immediately upon implantation, eliminating the need for additional surgical interventions for antibiotic delivery
Solution Approach 2:
The implant coating system autonomously provides antibiotic delivery through controlled release from the collagen nanofiber matrix, without requiring external surgical intervention or additional medical procedures
2Reliability
If hydroxyapatite content is increased to enhance bioactivity, then osteointegration improves, but mechanical resistance decreases
Solution Approach 1:
The coating combines collagen type I nanofibers with hydroxyapatite nanoparticles to create a composite material that leverages the mechanical strength and structural integrity of collagen while incorporating the bioactive osteointegration properties of hydroxyapatite, achieving both high mechanical resistance and excellent osteointegration
Solution Approach 2:
Hydroxyapatite nanoparticles are distributed within the collagen nanofiber matrix at optimized local concentrations, providing sufficient bioactivity and osteointegration enhancement while maintaining the overall mechanical integrity of the coating structure
3Ease of manufacture
If poly(ethylene oxide) is used to facilitate electrospinning, then nanofiber formation improves, but cytotoxicity increases
Solution Approach 1:
Poly(ethylene oxide) is used only as a temporary processing aid during electrospinning and is completely removed through extensive washing with water and ethanol, leaving no detectable residues in the final coating, thus eliminating cytotoxicity while maintaining nanofiber formation capabilities
Solution Approach 2:
Poly(ethylene oxide) serves as a disposable sacrificial component that facilitates the electrospinning process but is intentionally designed to be completely removed after processing, similar to a temporary mold or support structure that is discarded after serving its purpose
4Reliability
If antibiotics are released at high concentrations, then antimicrobial efficacy improves, but systemic toxicity increases
Solution Approach 1:
The coating provides localized high-concentration antibiotic release at the implant surface where it is most needed for preventing infections, while the controlled release mechanism ensures that systemic exposure remains minimal, achieving high local efficacy without proportional systemic toxicity
Solution Approach 2:
Antibiotics are pre-loaded into the coating at high concentrations ready for immediate local release upon implantation, creating a high local concentration gradient that drives effective antimicrobial action at the implant site while limiting systemic absorption
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 solution provides a biocompatible, biodegradable coating that achieves sustained antibiotic release exceeding minimum inhibition concentrations without systemic toxicity, enhancing osteoinductive properties and reducing the need for secondary surgeries.
Implementation Method 1
The layer is prepared by the combination of electrospinning and electroblowing of the collagen solution comprising hydroxyapatite nanoparticles
Implementation Method 2
The layer is prepared by the combination of electrospinning and electroblowing of the collagen solution comprising hydroxyapatite nanoparticles
Implementation Method 3
using crosslinking agents like EDC and NHS
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3~4
AI summary
The subject of the invention is a bioactive nanocomposite layer prepared by the combination of electrospinning and electroblowing of a collagen solution comprising hydroxyapatite nanoparticles and poly(ethylene oxide), where, after the preparation and the crosslinking, the layer consists of 75 to 100 wt. % of collagen type I fibres, 5 - 15 wt. % of hydroxyapatite, and 0 - 1 wt. % of poly(ethylene oxide). The subject of this invention is also a method of production of said layer and a method of depositing antibiotics for a more effective releasing thereof without increasing the cytotoxicity. Said method comprises the impregnation of crosslinked sterilized collagen/hydroxyapatite layers with antibiotics in the form of a solution. The subject of the invention also comprises orthopaedic and dental implants based on metal or metal alloys, electrostatically coated with said composite layer based on collagen nanofibers with integrated hydroxyapatite nanoparticles and an antibiotic or a combination of antibiotics.