Drug Eluting Composite Segmented Polymeric Release Pathways
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Solution Overview
Problem
Conventional drug delivery systems face challenges in controlling the release rate of therapeutic agents over long periods without leaving residual drug, often requiring high polymer mass fractions that can entrap drugs permanently or for undesirable periods, and struggle with unstable compositions that necessitate rapid release.
Innovation Solution
The development of biocompatible polymeric materials with permeable and impermeable compositions and structures that create specific pathways for therapeutic agents to exit, allowing tailored release rates by altering the dimensions, placement, and characteristics of impermeable or semi-impermeable components without changing the drug amount or distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high polymer mass fractions are used to control release rate over long periods, then duration of action is improved, but loss of substance worsens due to permanent drug entrapment
Solution Approach 1:
The polymeric material is segmented into permeable and impermeable regions, creating a heterogeneous structure. The permeable regions allow drug molecules to diffuse through and exit, while impermeable regions provide structural support and control the release kinetics. This segmentation prevents complete drug entrapment while maintaining long-term release capability.
Solution Approach 2:
Different regions of the polymeric material have different permeability properties. Permeable regions are designed with specific pore structures or hydrophilic characteristics that facilitate drug diffusion, while impermeable regions have dense or hydrophobic characteristics that restrict drug passage. This local quality variation enables controlled release without permanent entrapment.
2Loss of substance
If permeable compositions are used to allow drug exit, then loss of substance is improved (reduced entrapment), but duration of action worsens due to rapid drug release
Solution Approach 1:
The permeability parameter of the polymeric material is changed spatially, creating regions with different drug diffusion coefficients. By adjusting the proportion, distribution, and characteristics of permeable versus impermeable regions, the release kinetics can be tuned to achieve both reduced entrapment and extended duration of action.
3Duration of action of moving object
If impermeable compositions are used to extend drug release time, then duration of action is improved, but loss of substance worsens due to increased drug entrapment
Solution Approach 1:
The polymeric material is designed as a composite system combining permeable and impermeable phases. The impermeable regions provide the necessary duration of action by controlling diffusion rates, while the permeable regions ensure complete drug delivery. The synergistic interaction between these phases resolves the contradiction between extended release and complete drug release.
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
This approach enables controlled and extended release of therapeutic agents, minimizing residual drug and ensuring timely delivery, even for unstable compositions, by manipulating the elution pathways and diffusion coefficients within the polymeric materials.
Implementation Method 1
The time taken for therapeutic agents to exit the invention is also extended or affected by the pathways. Pathways are established in the present invention with combinations of permeable and impermeable compositions and/or structures located within the material containing the therapeutic agents.
Data Source
AI summary
The present invention relates to materials having therapeutic compositions releasably contained within the materials. The materials are configured to release therapeutic compositions at a desired rate. The present invention also relates to devices incorporating the materials.