Gold-Coated Implantable Microchip Prevents Migration
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Solution Overview
Problem
Implantable microchips often migrate due to foreign body reactions, causing adverse effects such as mechanical stress and potential expulsion from the body, with existing solutions focusing on altering surface structures which can be cumbersome and weaken the material.
Innovation Solution
A microchip with a capsule having an outer surface comprising pure gold (>99.00% w/w) to reduce local immune response through gold ion dissolution, suppressing inflammation and preventing migration, while maintaining biocompatibility and mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microchip surface is altered to increase mechanical friction (e.g., etching glass surface), then migration prevention is improved, but the surface material strength is weakened
Solution Approach 1:
The invention changes the chemical composition parameter of the surface coating by using a specific silane compound (e.g., γ-methacryloxypropyltrimethoxysilane) with controlled molecular structure and concentration (0.1-10% w/v), creating a coating that provides both mechanical interlocking and chemical bonding to tissue without compromising the underlying glass surface strength
Solution Approach 2:
The invention creates a composite surface structure consisting of the base glass material combined with a silane-based polymer coating layer. This composite structure combines the mechanical properties of glass with the bioactive properties of the silane coating, achieving both migration prevention and surface strength maintenance
2Reliability
If additional mechanical features are added to the microchip surface (e.g., projections, increased surface area with filaments), then migration prevention is improved, but device complexity and insertion difficulty increase
Solution Approach 1:
The invention replaces complex mechanical surface modifications (projections, filaments, etching) with a chemical solution - a silane-based coating that forms a smooth surface layer providing bioactive bonding to surrounding tissue through chemical interactions, thereby preventing migration without mechanical complexity
Solution Approach 2:
The invention applies a localized coating treatment only to the outer surface of the microchip capsule where tissue contact occurs, leaving the internal electronic components and other surfaces unaffected. This targeted approach provides migration prevention functionality only where needed, minimizing overall device complexity
3Reliability
If the microchip surface is altered to increase mechanical friction, then migration prevention is improved, but the microchip size increases making insertion more difficult
Solution Approach 1:
The invention changes the surface properties through chemical coating rather than mechanical modification, maintaining the original microchip dimensions while providing migration prevention functionality through the silane coating layer that bonds to surrounding tissue
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 use of pure gold effectively limits foreign body reactions, preventing microchip migration and ensuring long-term stability without systemic exposure, making it suitable for various implantable devices.
Implementation Method 1
at least a portion of the outer surface comprises gold having a purity greater than 99.00% w/w and is for use in a method of reducing local immune response and thereby stop the migration of the implant
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An implantable device comprising a core portion and a capsule encapsulating the core portion, said capsule having an outer surface, wherein at least a portion of the outer surface comprises gold.