Implantable Nanotopography for Bioactive Agent Delivery
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Solution Overview
Problem
Implantable devices that deliver bioactive agents face challenges such as local inflammation and immune responses, which prevent effective delivery of the agent across natural barriers like vessel walls, leading to destruction by the body's defense mechanisms.
Innovation Solution
The development of implantable delivery devices with nanotopography patterns on their surfaces, which include fractal geometries and nanostructures, to enhance biointegration and avoid immune responses, allowing for prolonged and efficient delivery of bioactive agents by interacting with biological tissues without triggering foreign body reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If implantable devices are used to deliver bioactive agents, then targeted delivery to specific sites is achieved, but local inflammation and immune responses occur that prevent effective delivery
Solution Approach 1:
The patent applies parameter changes by modifying the surface topography of the implantable device at the nanoscale. Specifically, the device surface is engineered with nanofeatures having characteristic dimensions of 1-100 nanometers, which changes the physical parameters of the device-tissue interface. This nanoscale parameter modification alters protein adsorption patterns and cellular recognition, thereby reducing immune response while maintaining bioactive agent delivery capability.
Solution Approach 2:
The patent employs composite materials by combining the implantable device substrate with nanoscale surface modifications. The device consists of a base material (such as biocompatible metal or polymer)复合ed with nanoscale features that may include nanofibers, nanoparticles, or nanotextures. This composite structure provides both the mechanical functionality of the base material and the immunomodulatory properties of the nanoscale surface features.
2Quantity of substance
If natural barriers like vessel walls are present, then they protect the body, but they prevent delivery of bioactive agents across the barrier to targeted tissue
Solution Approach 1:
The patent applies local quality by creating spatially differentiated surface properties on the implantable device. The nanoscale features are distributed non-uniformly across the device surface, with different regions having varying nanotopography characteristics. This local variation enables specific zones to interact differently with biological barriers, facilitating targeted penetration or adhesion at specific locations while maintaining protective functions in other areas.
Solution Approach 2:
The patent utilizes dimensionality change by transitioning from macroscopic device features to nanoscale surface features. The nanoscale dimensions (1-100 nm) represent a different size dimension that enables interactions with biological molecules and cellular structures that are inaccessible at the macroscopic scale. This dimensional transition allows the device to interact with and potentially traverse biological barriers through mechanisms such as nanopenetration or enhanced cellular uptake.
Data Source
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AI summary
An implantable delivery device and method for utilizing the device to delivery a bioactive agent to a subject in need thereof is described. The device includes a pattern of structures fabricated on a surface of the device to form a nanotopography. A random or non-random pattern of structures may be fabricated such as a complex pattern including structures of differing sizes and/or shapes. The device may be located adjacent tissue such as an endovascular implant or a perivascular implant, and may deliver the bioactive agent without triggering an immune or foreign body response to the bioactive agent.