Cross-Linked Retention Vehicle Polymer for Local Drug Delivery
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Solution Overview
Problem
Drug delivery vehicles and pharmaceutical compositions often face rapid clearance from the site of administration, necessitating frequent re-administration and leading to unwanted side effects due to diffusion and migration, which complicates prolonged treatment duration.
Innovation Solution
Compositions comprising a retention vehicle polymer cross-linked with a controlled release cross-linking agent to improve local retention of bioactive agents at the administration site, utilizing biodegradable polymeric microparticles and ligands for tissue adherence, such as hyaluronic acid and metal salts, to maintain extended release and reduce migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a retention vehicle polymer is used to deliver bioactive agents locally, then local delivery is achieved, but rapid clearance occurs requiring frequent re-administration
Solution Approach 1:
The cross-linking agent is incorporated into the retention vehicle polymer formulation before administration. Upon injection, the cross-linking agent immediately begins to form cross-links within the polymer network, creating a stable structure that prevents rapid clearance. This preliminary preparation ensures that the polymer network is already configured to maintain bioactive agents at the administration site for extended periods, eliminating the need for frequent re-administration.
Solution Approach 2:
The invention creates a composite polymer network by combining the retention vehicle polymer with a cross-linking agent. This composite structure integrates the bioactive agent-containing polymer chains into a three-dimensional cross-linked network, which significantly enhances the retention capability. The composite material approach allows the polymer to maintain its bioactive properties while gaining improved stability and resistance to clearance mechanisms.
2Reliability
If the polymer network is made more stable to prevent clearance, then local retention improves, but diffusion and migration away from the site increases
Solution Approach 1:
The cross-linking agent is designed to selectively cross-link the retention vehicle polymer at the administration site, creating a localized dense polymer network. This local quality change ensures that the cross-linked structure remains confined to the injection site, preventing both clearance and unwanted diffusion/migration to other areas. The localized cross-linking density provides stability exactly where needed without creating harmful effects elsewhere.
3Duration of action of stationary object
If cross-linking is used to improve retention, then local retention is enhanced, but system complexity increases
Solution Approach 1:
The cross-linking agent serves as an intermediary substance that facilitates the formation of the stable polymer network without being part of the final retained structure. After the cross-linking reaction occurs, the cross-linking agent becomes integrated into the polymer network or degrades, leaving behind the stable cross-linked polymer structure. This intermediary approach simplifies the overall system by using a single additive to achieve complex network formation, rather than requiring multiple components or sophisticated delivery mechanisms.
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
Achieves prolonged retention of bioactive agents at the site of administration for up to several months, reducing the need for re-dosing and minimizing systemic side effects by forming a stable polymer network that adheres to tissues like joints, thereby enhancing local therapy efficacy.
Implementation Method 1
a curing agent, such as a catalyst like for example stannous octoate or stannous chloride, is added to a prepolymer polymer mixture. Such a mixture may form in situ a polymer solid or gelatinous matrix by covalent linking.
Implementation Method 2
biodegradable polymeric microparticles and ligands for tissue adherence, such as hyaluronic acid and metal salts, to maintain extended release and reduce migration.
Data Source
AI summary
Disclosed herein are compositions comprising cross-linkers for cross-linking a retention vehicle polymer. The compositions are particularly useful for local administration of a bioactive agent, wherein prolonged or extended availability of the bioactive agent at the site of administration is desired. Also disclosed are methods of delivering the compositions to a subject.