Microlayer Coextrusion for Uniform Drug Release
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Solution Overview
Problem
Current medical devices using polymers for drug delivery face challenges in achieving controlled, sustained release of pharmaceutical agents due to limitations in biocompatibility and versatility, particularly in achieving uniform and constant drug release rates.
Innovation Solution
The development of medical devices through microlayer coextrusion, which involves amplifying laminated flow streams to create thin, nanometer-range geometries with layered biocompatible polymers and drug substances, allowing for controlled time-dependent drug delivery across various medical devices such as catheters, stents, and pills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer drug delivery systems are used, then biocompatibility is achieved, but uniform and constant drug release rates cannot be achieved
Solution Approach 1:
The device is segmented into multiple distinct layers with different polymer compositions and drug concentrations. Each layer is designed to release drug at a specific rate, and the combination of layers produces an overall uniform release profile. This segmentation allows precise control over drug delivery kinetics while maintaining biocompatibility of individual layers.
Solution Approach 2:
The invention uses composite multilayer structures combining different biocompatible polymers (e.g., PLGA, PLA, PCL) with varying degradation rates and drug loading capacities. By selecting and combining specific polymer materials with complementary properties, the system achieves both biocompatibility and controlled uniform drug release through the synergistic effects of the composite structure.
2Adaptability or versatility
If microlayer coextrusion is used to create thin geometries, then controlled time-dependent drug delivery is achieved, but device complexity increases
Solution Approach 1:
The invention controls drug release by systematically varying parameters across layers including polymer composition, layer thickness, drug concentration, and crystallinity. These parameter changes are achieved through controlled coextrusion processing, allowing precise temporal control of drug delivery without requiring overly complex device architectures. The multilayer structure itself provides the complexity needed for controlled release.
Solution Approach 2:
The invention transitions from simple single-layer structures to multilayer geometries, adding the dimension of layering to control drug release. This dimensional approach allows independent control of release kinetics through layer composition and thickness variations, achieving complex time-dependent delivery profiles while maintaining relatively simple overall device geometry suitable for various medical applications.
3Adaptability or versatility
If multiple polymers are layered to control release, then drug release profile customization is improved, but manufacturing precision requirements increase
Solution Approach 1:
The coextrusion process is designed to simultaneously produce multiple layers with different polymer compositions, drug loadings, and thicknesses in a single manufacturing step. This multi-functional approach allows customization of drug release profiles for different therapeutic needs while maintaining consistent manufacturing precision through process control rather than requiring separate manufacturing steps for each layer variation.
Data Source
AI summary
The present disclosure relates to medical devices containing time-release drug substance, and more particularly, to medical tubing, catheters, stents, cables (including fiber optic cables), pills, capsules, sheaths, threads, clamps, sutures, and endotracheal devices. The invention also generally relates to a method for extruding multiple laminated flow streams using microlayer coextrusion to create these various time-release drug delivery products.