Microwave-Powered Reactor for In Situ Forming Implants
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Solution Overview
Problem
Current methods for forming crosslinked polymers for medical devices using click chemistry and microwave technology face challenges in achieving efficient and selective crosslinking, particularly for injectable applications where rapid and pure yield is desired.
Innovation Solution
An apparatus comprising a supply assembly for dispensing and mixing first and second precursors functionalized with reactive members, combined with microwave energy to facilitate crosslinking within a mixing cavity, potentially aided by a catalyst coating, to produce a flowable composition suitable for medical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microwave energy is used to accelerate crosslinking reactions, then reaction speed and yield are improved, but control over gelation time and homogeneity may deteriorate
Solution Approach 1:
The patent applies parameter changes by using microwave irradiation at specific power levels (e.g., 50-200 W) and controlling temperature ranges (e.g., 25-40°C) to achieve rapid crosslinking while maintaining control over gelation time. The microwave energy provides rapid heating and activation of crosslinking reactions, while the controlled parameters ensure homogeneous gelation and prevent runaway reactions.
Solution Approach 2:
The patent employs catalysts (such as transition metal ions like Cu2+, Fe3+, or Zn2+) as intermediaries to mediate the crosslinking reaction between first and second precursors. These catalysts facilitate the click chemistry reactions, enabling controlled and rapid crosslinking under microwave irradiation, thus achieving both high productivity and precise gelation time control.
2Reliability
If click chemistry is used for crosslinking, then reaction selectivity and yield are improved, but reaction time and mixing requirements may worsen
Solution Approach 1:
The patent implements continuous mixing during microwave irradiation to maintain homogeneous distribution of precursors and catalysts throughout the reaction process. This continuous action ensures that the selective click chemistry reactions proceed uniformly throughout the mixture, achieving high selectivity and yield while minimizing reaction time through uninterrupted progress of the crosslinking reaction.
Solution Approach 2:
The patent employs periodic or pulsed microwave irradiation cycles, alternating between heating phases and mixing phases. This periodic action allows the system to achieve rapid crosslinking during microwave exposure while ensuring thorough mixing and heat distribution during intervals, thus maintaining reaction selectivity and reducing overall reaction time.
3Stability of the object's composition
If precursors are mixed and irradiated in a closed reactor, then reaction homogeneity and safety are improved, but device complexity and cost may worsen
Solution Approach 1:
The patent employs a multi-functional mixing cavity that serves as both a mixing chamber and a microwave irradiation reactor. This single component performs multiple functions: it mixes the precursors homogeneously, contains the reaction mixture during irradiation, and facilitates heat transfer, thereby achieving reaction homogeneity and safety without significantly increasing device complexity.
Solution Approach 2:
The patent combines the mixing assembly and irradiation chamber into a single integrated mixing cavity. This merging of functions allows the system to achieve homogeneous mixing and controlled microwave irradiation simultaneously in one component, reducing the number of separate devices needed and simplifying the overall reactor structure while maintaining stability and safety.
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 solution enables the rapid and selective crosslinking of polymers, producing a stable and biocompatible medical device with enhanced adherence to tissue, biodegradability, and controlled gelation time, suitable for various surgical and wound treatment applications.
Implementation Method 1
The microwave energy source is configured and adapted to irradiate the mixed first and second precursors within the mixing cavity
Implementation Method 2
A catalyst, such as a transition metal ion, may be incorporated into the mixing cavity of the present apparatus to further aid in the polymerization of the first and second precursors
Implementation Method 3
Click chemistry refers to a collection of reactions capable of forming a highly reliable molecular connection in solution or bulk state
Data Source
AI summary
The present disclosure relates to an apparatus and process for forming medical devices from an injectable composition. The apparatus includes a supply assembly, a mixing assembly, and at least one source of microwave energy. The supply assembly is configured to maintain and selectively dispense a first precursor functionalized with a first reactive member and a second precursor functionalized with a second reactive member. The mixing assembly is configured to mix the first and second precursors within a mixing cavity defined therein. The microwave energy source is configured and adapted to irradiate the mixed first and second precursors within the mixing cavity.