Sublimable Matrix Sustained Release Drug Delivery
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Solution Overview
Problem
Current bioerodable matrices for controlled drug release face challenges in maintaining stability and efficacy due to chemical and physical degradation of proteins and unstable bioactive agents, particularly in acidic environments and at body temperature, leading to limited success in sustained release applications.
Innovation Solution
A chemically inert drug delivery system utilizing a sublimable matrix material that undergoes sublimation rather than dissolution or chemical erosion, providing a hydrophobic environment for sustained release of biologically active agents, with adjustable release rates and profiles through blending of matrix materials and inclusion of sublimation rate modifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If biodegradable polymers are used as matrices for controlled drug release, then sustained release of therapeutic compounds is achieved, but chemical and physical degradation of proteins occurs leading to loss of biological activity
Solution Approach 1:
The patent employs an inert hydrophobic matrix environment that excludes water and prevents chemical reactions with oxygen, thereby protecting proteins from degradation. The matrix creates a controlled inert atmosphere that maintains protein stability throughout the sustained release period without the harmful chemical environment of traditional biodegradable polymers.
Solution Approach 2:
The patent uses composite material systems combining hydrophobic matrix materials with protein drugs. This composite approach allows the matrix to provide structural integrity and controlled release while simultaneously protecting the protein from degradation, resolving the contradiction between sustained release duration and biological activity stability.
2Reliability
If oleagenuous delivery vehicles are used to protect protein drugs from aqueous degradation, then protection from hydrolysis is improved, but the vehicles themselves become unstable at body temperature leading to oxidative degradation
Solution Approach 1:
The patent converts the potential harm of hydrophobicity (which can lead to aggregation) into a benefit by using it to exclude water and protect proteins from hydrolysis. The hydrophobic matrix creates a water-free environment that prevents aqueous degradation pathways while maintaining vehicle stability through careful material selection.
Solution Approach 2:
The patent changes the physical and chemical parameters of the delivery vehicle by selecting materials with appropriate glass transition temperatures, melting points, and hydrophobicity levels. These parameter changes ensure the vehicle remains stable at body temperature while providing effective protection from hydrolysis and oxidative degradation.
3Ease of operation
If biodegradable polymers are used for sustained release, then patient compliance is increased, but acidic environment during matrix erosion causes chemical inactivation of proteins
Solution Approach 1:
The patent creates an inert microenvironment within the matrix that prevents acidification during erosion. By using non-biodegradable hydrophobic materials, the matrix avoids the acidic byproducts of polymer degradation, thereby protecting proteins from chemical inactivation while maintaining sustained release capabilities that improve patient compliance.
Solution Approach 2:
The hydrophobic matrix acts as an intermediary barrier between the protein drug and the external environment. This intermediary prevents contact with water and acid, protecting the protein from degradation while allowing controlled release over time, thus maintaining both patient compliance and protein stability.
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 ensures the stability and sustained release of reactive or unstable bioactive agents by minimizing chemical and physical degradation, allowing for controlled and prolonged delivery of therapeutic agents, including proteins, with adjustable release rates and profiles.
Implementation Method 1
A chemically inert drug delivery system utilizing a sublimable matrix material that undergoes sublimation rather than dissolution or chemical erosion
Data Source
AI summary
The invention relates to compositions suitable for the delivery and/or stabilization of biologically active substances. The compositions comprise a sublimable matrix material and the biologically active agent to be delivered. The compositions can be used as drug delivery systems to treat a wide variety of diseases or as systems for the protection and stabilization of such substances. Also disclosed are methods for preparing compositions of the present invention.