Bioactive Composite Stent Coatings via Template-Assisted Deposition
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Solution Overview
Problem
Existing methods for coating implantable medical devices with bioactive materials face challenges such as unpredictable drug release, pro-thrombotic and pro-inflammatory responses, inadequate bonding, uneven coating, and limited bioactive material storage capacity, leading to inefficiencies and adverse effects.
Innovation Solution
The method involves depositing bioactive materials directly into or alternating with metal layers on the surface of medical devices using template-assisted electro- or electroless deposition processes, creating a bioactive composite structure with controlled pore formation and codeposition of metals and bioactive agents, which allows for even coating, stable drug delivery, and reduced adverse reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric coatings are used to adhere bioactive materials to implantable medical devices, then bioactive materials can be held and released, but the degradation kinetics are unpredictable and release timing cannot be controlled
Solution Approach 1:
The patent changes the material parameter from polymeric to metallic coating, fundamentally altering the release mechanism from degradation-based to diffusion-based. This enables predictable release kinetics through controlled pore sizes and metal layer thickness, eliminating the unpredictability inherent in polymeric degradation processes.
Solution Approach 2:
The invention creates a composite structure combining metallic coating with integrated pores and bioactive materials. This composite approach allows simultaneous achievement of mechanical durability, controlled drug release, and predictable kinetics by combining the advantages of metal (strength, stability) with engineered pore structures (controlled release).
2Reliability
If polymeric coatings are used to deliver bioactive materials, then drug delivery is achieved, but pro-thrombotic and pro-inflammatory responses occur
Solution Approach 1:
The patent changes the coating material parameter from polymer to metal, fundamentally altering the biological response profile. Metallic coatings eliminate the pro-thrombotic and pro-inflammatory responses associated with polymeric materials while maintaining the ability to deliver bioactive materials therapeutically.
Solution Approach 2:
The invention converts the potential harm of having any coating material by selecting a metallic material that is biocompatible and non-thrombogenic. The metallic coating acts as a beneficial substrate that prevents adverse reactions while still enabling drug delivery functionality.
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
This approach ensures predictable and prolonged bioactive material release, minimizes adverse reactions, and provides a stable and effective coating that eliminates negative effects post-drug elution, while being cost-effective and scalable.
Implementation Method 1
forming a composite structure on portions of the substrate not covered by the template using an electrochemical process
Implementation Method 2
template-assisted electro- or electroless deposition processes, creating a bioactive composite structure with controlled pore formation
Implementation Method 3
template-assisted electro- or electroless deposition processes
Data Source
AI summary
Disclosed herein are methods to create medical devices and medical devices including bioactive composite structures. The methods include using template-assisted electro- or electroless deposition or codeposition methods for providing implantable medical devices coated with bioactive composite structures and also include layering deposited or codeposited metal layers with layers of bioactive materials. In one use, the implantable medical devices of the present invention include stents with bioactive composite structure coatings.