Self-Assembling Molecular Nano Film for Implantable Devices
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Solution Overview
Problem
Chronic implantation of medical devices leads to fibrous tissue growth around the devices, making it difficult to replace or re-locate them due to collagen capsule formation and micro cracks on the electrode surface, which existing methods like PTFE coatings and silicone rubber injection only partially address.
Innovation Solution
A self-assembling, cross-linking molecular nano film is applied to the surface of implantable medical devices, preventing leukocyte attachment and reducing fibroblast adhesion, proliferation, and tissue encapsulation by forming a thin, porous, conductive barrier that minimizes air gaps and allows for electrical discharge without dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a porous PTFE coating is applied to prevent tissue in-growth, then tissue attachment is reduced, but the coating adds device complexity and may not fully prevent micro crack formation
Solution Approach 1:
The patent applies a thin film coating (5-500 nanometers) on the electrode surface that acts as a flexible barrier to prevent tissue attachment while maintaining electrical conductivity. This thin film approach reduces the complexity compared to thicker porous coatings while achieving the same protective function.
Solution Approach 2:
The patent uses composite material structures combining conductive polymers with porous frameworks or carbon nanotubes to create a coating that simultaneously provides tissue rejection properties and electrical conductivity, eliminating the need for separate functional layers.
2Object-affected harmful factors
If silicone rubber is injected into electrode coil spaces to minimize tissue in-growth, then tissue bonding is reduced, but the method increases manufacturing complexity and may affect electrical stimulation delivery
Solution Approach 1:
The patent replaces the mechanical injection process with chemical vapor deposition or solution-based coating methods that form the protective layer through chemical reactions, eliminating complex injection equipment and processes while achieving uniform coverage.
Solution Approach 2:
The patent employs self-assembling monolayers that automatically organize themselves on the electrode surface through molecular interactions, eliminating the need for manual injection or complex manufacturing steps while providing consistent tissue-rejection properties.
3Object-affected harmful factors
If existing coatings are applied to prevent tissue in-growth, then fibrous tissue growth is reduced, but electrical conductivity may be compromised due to dielectric breakdown
Solution Approach 1:
The patent uses porous conducting polymers and carbon nanotube structures that provide physical pathways for electrical current while the porous framework prevents tissue attachment, simultaneously achieving both tissue rejection and electrical conductivity functions.
Solution Approach 2:
The patent changes the electrical properties of the coating by using intrinsically conducting materials with tunable conductivity parameters, allowing optimization of both tissue-rejection and electrical-functionality performance through material composition rather than thickness control.
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 molecular nano film effectively prevents tissue attachment and encapsulation, facilitating easier removal of chronically-implanted devices by reducing fibrous tissue growth and maintaining electrical functionality.
Implementation Method 1
The film comprises self-assembling cross-linking molecules
Implementation Method 2
provides a barrier to tissue attachment
Implementation Method 3
The film comprises self-assembling cross-linking molecules
Implementation Method 4
forming a thin, porous, conductive barrier
Implementation Method 5
allows for electrical discharge without dielectric breakdown
Data Source
AI summary
The present invention is a molecular nano film formed on a surface of an implantable medical device to provide a barrier to tissue attachment. The film comprises self-assembling cross-linking molecules.