Amphiphilic Coating for Bioabsorbable Medical Devices
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Solution Overview
Problem
Implantable medical devices face challenges with immediate degradation, which can lead to immune responses and inflammation, potentially weakening the device before it is fully integrated with tissue.
Innovation Solution
A bioabsorbable polymeric substrate coated with an amphiphic compound having a hydrophilic and hydrophobic portion, where the hydrophobic portion is covalently bonded to the substrate, retarding degradation and promoting cellular integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a biodegradable device is used to allow cellular ingrowth and integration, then the device can be replaced by growing tissue, but the device degrades immediately causing immune response and inflammation that speeds up degradation and weakens the device
Solution Approach 1:
The device is pre-coated with an amphiphilic compound before implantation. This preliminary action creates a protective barrier that slows down the degradation process, allowing the device to maintain its structural integrity and strength during the critical initial period when cellular ingrowth and integration are occurring, thereby preventing premature failure due to immune response and inflammation
Solution Approach 2:
The amphiphilic compound acts as an intermediary layer between the biodegradable device and the biological environment. This intermediate coating modulates the interaction between the device and surrounding tissues, reducing the immune response and inflammatory reaction that would otherwise accelerate degradation and compromise device strength while still permitting cellular ingrowth
2Strength
If a non-biodegradable device is used to provide increased strength and support, then the device maintains structural integrity, but the permanency prevents cellular growth and integration
Solution Approach 1:
The degradation rate parameter of the device is modified by coating it with an amphiphilic compound. This changes the temporal profile of degradation, allowing the device to maintain its strength and structural integrity for a longer period while still ultimately degrading to permit cellular growth and integration, thus bridging the gap between permanent and biodegradable devices
Solution Approach 2:
The device becomes a composite structure combining the biodegradable substrate with the amphiphilic compound coating. This composite material exhibits properties that are a combination of both components: the structural strength of the biodegradable polymer and the controlled degradation characteristics provided by the amphiphilic coating, enabling both strength maintenance and eventual cellular integration
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 coating slows the degradation process, improving in vivo persistence and reducing inflammatory responses, allowing for better integration of the device with tissue.
Implementation Method 1
the hydrophobic portion of the amphiphilic compound being covalently bonded to the bioabsorbable polymeric substrate
Implementation Method 2
Biodegradable devices are designed to degrade (hydrolytically or enzymatically) within the body
Data Source
AI summary
The present disclosure relates to implantable bioabsorbable medical devices having an amphiphilic coating for delaying the degradation of the device and methods of making such devices.