Biodegradable Polymer Bioactive Conjugates Controlled Release
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Solution Overview
Problem
Current drug delivery systems using polymers face challenges in controlling the release rate of bioactive moieties, with existing methods either relying on polymer breakdown for drug release, leading to uncontrolled dosages and limited drug loading, or facing steric and thermodynamic constraints that reduce control over bioactive moiety distribution and release.
Innovation Solution
Development of biodegradable polymers with releasable bioactive moieties pendant from the polymer backbone, formed from monomeric units coupled via biodegradable moieties, allowing for controlled release of bioactive moieties at a rate equal to or faster than the polymer backbone degradation, maintaining structural integrity and achieving high bioactive moiety loadings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the admixture approach is used to prepare polymer-drug formulations, then the drug can be loaded into the polymer structure, but the release of the therapeutic agent is largely dependent on the breakdown of the polymer structure resulting in poor control of the rate of drug release
Solution Approach 1:
The patent segments the drug release mechanism from the polymer degradation mechanism by using covalent linkers with different stability characteristics. The drug is attached to the polymer backbone through cleavable linkers that can be designed to hydrolyze at specific rates, allowing the drug release to be controlled independently from the polymer degradation rate. This resolves the contradiction by enabling precise control over drug release kinetics while maintaining high drug loading capacities.
Solution Approach 2:
The patent employs parameter changes by varying the chemical structure of the linker moiety to control the rate of drug release. By selecting linkers with different bond strengths, hydrolysis rates, and chemical compositions, the release kinetics can be precisely tuned. This allows the system to achieve both high drug loading and controlled release rates, resolving the technical contradiction between quantity of substance and manufacturing precision.
2Reliability
If the linking approach is used where drug molecules are covalently attached to a pre-formed polymer backbone, then the drug-polymer conjugate can be formed, but steric and thermodynamic constraints can affect the amount of bioactive moiety that can be covalently attached and impact on the distribution of the bioactive moiety along the polymer backbone
Solution Approach 1:
The patent applies segmentation by introducing flexible spacer moieties between the polymer backbone and the bioactive moiety. These spacers reduce steric hindrance and allow for higher density of attached bioactive moieties along the polymer chain. The segmented structure also improves the distribution uniformity of bioactive moieties, resolving the contradiction between reliable conjugate formation and maximizing the amount of bioactive moiety attached.
3Quantity of substance
If the polymer structure must degrade to release the drug, then the drug can be released from the polymer backbone, but this is disadvantageous where it is desirable to at least maintain the polymer structure while the drug is being released
Solution Approach 1:
The patent extracts the drug release function from the polymer degradation process by using cleavable linker moieties that are specifically designed to hydrolyze and release the drug while leaving the polymer backbone intact. The linker acts as a separate, removable component that mediates drug release without requiring degradation of the main polymer structure. This resolves the contradiction by enabling drug release while maintaining polymer structure integrity.
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 biodegradable polymer system enables controlled and efficient delivery of bioactive moieties, maintaining polymer structural integrity during release, achieving high bioactive moiety loadings and ensuring bioactive compounds are released unencumbered by excess molecular fragments, thus enhancing the efficacy and safety of drug delivery.
Implementation Method 1
the biodegradable polymer backbone is formed from monomeric units that are each coupled via a biodegradable moiety
Data Source
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AI summary
The invention relates to a biodegradable polymer comprising a plurality of releasable bioactive moieties, the releasable bioactive moieties being pendant from and covalently bonded to the biodegradable polymer backbone, wherein the biodegradable polymer backbone is formed from monomeric units that are each coupled via a biodegradable moiety, and wherein the bioactive moieties are capable of being released at a rate equal to or faster than the rate of biodegradation of the polymer backbone.