Biodegradable Polyesters with NSAID Pendant Groups for Controlled Drug Release
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Solution Overview
Problem
Current drug delivery systems for non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen suffer from low drug loadings, uncontrolled release, and use of non-biodegradable materials, leading to severe gastrointestinal side effects and short duration of action.
Innovation Solution
Development of biodegradable polyesters with NSAIDs as pendant groups, synthesized using tin (II) 2-ethylhexanoate as catalyst, which release the drugs in a controlled manner and are cytocompatible, reducing side effects and extending drug duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high and repeated systemic doses of NSAIDs are administered to treat long-lasting pain and inflammation, then the duration of drug effect is extended, but severe gastrointestinal side effects occur
Solution Approach 1:
The patent segments the drug delivery process by using biodegradable polyester particles that release NSAIDs gradually over time. The polymer matrix is divided into segments that erode progressively, controlling drug release rate and duration while maintaining localized concentration at the injection site, thereby extending drug effect without requiring repeated high systemic doses that cause GI side effects
Solution Approach 2:
The biodegradable polyester acts as an intermediary carrier between the NSAID and the biological system. This intermediary material controls drug release kinetics through its degradation rate, providing sustained delivery while protecting the drug from rapid systemic distribution. The polyester matrix mediates between the need for prolonged action and the need to minimize harmful effects by maintaining controlled local concentrations
2Duration of action of moving object
If drug delivery systems are used to control drug release and prolong duration of effect, then the duration of action is extended, but the systems suffer from low drug loadings and uncontrolled burst release
Solution Approach 1:
The patent merges the NSAID molecules directly into the polyester polymer chain structure through covalent bonding. The drug is incorporated as pendant groups or integrated into the repeating units of the polymer, achieving high drug loading (65-75% by weight). This merging approach eliminates the need for separate drug-polymer mixtures and provides controlled release without burst effect, as the drug is released only through systematic degradation of the polymer matrix
Solution Approach 2:
The invention creates a composite material system where the NSAID and polyester form an integrated structure. The composite consists of the polymer backbone with drug molecules incorporated throughout, creating a homogeneous material with high drug content. The composite structure allows controlled degradation and release, avoiding burst release while achieving high drug loading capacity
3Duration of action of moving object
If conventional drug delivery systems are used, then prolonged drug action is achieved, but non-biodegradable materials are used requiring surgical removal
Solution Approach 1:
The patent changes the key parameter of polymer degradability from non-biodegradable to biodegradable. The polyester is designed with hydrolyzable ester bonds that break down in physiological conditions, transforming the material from permanent to temporarily functional. This parameter change allows the system to provide prolonged drug action (weeks to months) while automatically degrading into harmless byproducts that are easily eliminated by the body, eliminating the need for surgical removal
Solution Approach 2:
The biodegradable polyester delivery system functions as a disposable, temporary implant that serves its purpose and then naturally disappears. The material is designed to be short-lived in the biological sense, degrading completely after delivering the drug over the intended period. This eliminates the need for permanent implants that require surgical removal, making the system easier to manufacture and deploy without complex retrieval procedures
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 polyesters achieve higher drug loadings (65-75%) with controlled and tunable release profiles, minimizing gastrointestinal side effects and providing prolonged drug action, while maintaining the chemical structure and bioactivity of the released NSAIDs.
Implementation Method 1
biodegradable polyesters...which release the drugs in a controlled manner
Implementation Method 2
synthesized using tin (II) 2-ethylhexanoate as catalyst
Data Source
AI summary
The invention provides polymers and methods for the treatment of pain and inflammation.