Difunctionalized Aromatic Polymers Gamma Sterilization
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Solution Overview
Problem
Current synthetic absorbable polymers used in medical applications are not biodegradable and are degraded by gamma radiation, limiting their sterilization options and controlled drug release capabilities.
Innovation Solution
Development of difunctionalized aromatic compounds with controllable hydrolysis profiles, which can be used to create absorbable polymers that are sterilizable by gamma radiation while maintaining physical and biological properties, enabling controlled drug release and extended bioavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gamma radiation is used for sterilization of synthetic absorbable polymers, then sterilization is achieved, but the polymer is significantly degraded
Solution Approach 1:
The patent modifies the chemical structure of the polymer by incorporating aromatic rings with specific functional groups (esters, amides, carbonates) that change the radiation sensitivity parameters. This structural modification allows the polymer to withstand gamma radiation sterilization without significant degradation while maintaining absorbability in the body.
Solution Approach 2:
The invention creates composite polymer structures combining aliphatic chains (for absorbability) with aromatic segments (for radiation resistance). This composite approach integrates the beneficial properties of both components: the aliphatic portions provide hydrolytic degradability while the aromatic portions provide radiation stability.
2Strength
If non-absorbable polymers like PET are used for surgical applications, then excellent physical properties and biocompatibility are achieved, but the polymers cannot be used for controlled drug release or absorbable sutures
Solution Approach 1:
The patent introduces localized hydrolytically labile functional groups (esters, amides, carbonates) at specific positions within the polymer chain. These local modifications create controlled degradation sites while the majority of the polymer backbone maintains its structural integrity and physical properties. This allows different regions of the polymer to have different functions: structural stability and controlled degradability.
3Duration of action of stationary object
If aromatic compounds are functionalized to create absorbable polymers, then biodegradability and controlled degradation profiles are achieved, but the complexity of polymer synthesis increases
Solution Approach 1:
The patent employs preliminary protection of functional groups during synthesis using standard protecting group chemistry. This allows sequential reactions to occur without unwanted side reactions, simplifying the overall synthesis pathway. The protecting groups are removed in final steps to reveal the desired functional groups, making the multi-step synthesis more controllable and predictable.
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 novel polymers exhibit enhanced bioavailability, controllable degradation profiles, and retain desirable physical and biological properties, allowing for effective sterilization and controlled drug release, addressing the limitations of existing polymers.
Implementation Method 1
The present invention provides novel difunctionalized aromatic compounds and absorbable polymers derived from them. The polymers are expected to have controllable degradation profiles.
Implementation Method 2
Implantable surgical devices must be sterile prior to implanting in the body. Sterilization of devices is usually accomplished by the use of heat, ethylene oxide, or gamma radiation using a 60Co source. However, all of the synthetic absorbable polymers now in commercial use are significantly degraded by gamma radiation.
Data Source
AI summary
The present invention relates to compounds of formula I, which are difunctionalized aromatic compounds, and polymers formed from the same.Polymers formed from the di-functionalized aromatics are expected to have controllable degradation profiles, enabling them to release an active component over a desired time range. The polymers are also expected to be useful in a variety of medical applications.