Thermosensitive Chitin Hydrogel Sustained-Release Analgesia
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Solution Overview
Problem
Current local anesthetic drugs have short action times, requiring frequent administration and posing safety risks due to systemic side effects, and existing sustained-release systems face challenges with organic solvents, chemical crosslinking, and burst release issues.
Innovation Solution
A thermosensitive modified chitin hydrogel system that forms a gel at body temperature, incorporating local anesthetic and analgesic drugs, along with degradable polymer microspheres, to provide a sustained-release analgesia system without organic solvents or chemical crosslinking, ensuring prolonged analgesia and reduced side effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If local anesthetic drugs are administered frequently to prolong analgesia effect, then the duration of action is improved, but systemic side effects and safety risks increase
Solution Approach 1:
The patent segments the drug delivery system into degradable polymer microspheres embedded within a hydrogel matrix. This segmentation allows the anesthetic drug to be released in a controlled, sustained manner from the microspheres, extending the duration of action while maintaining lower local concentrations that reduce systemic side effects.
Solution Approach 2:
The hydrogel acts as an intermediary carrier that encapsulates the degradable polymer microspheres. This intermediary system provides a dual-layer controlled release mechanism: the hydrogel provides initial sustained release while the embedded microspheres provide prolonged release, thereby extending analgesia duration without requiring frequent re-administration and reducing cumulative systemic exposure.
2Duration of action of moving object
If traditional sustained-release systems use organic solvents and chemical crosslinking, then the sustained-release effect is improved, but residual toxicity and environmental pollution increase
Solution Approach 1:
The patent employs physical crosslinking through temperature-induced gelation instead of chemical crosslinking agents. The hydrogel forms through physical interactions (hydrogen bonding, hydrophobic interactions) when the temperature increases, eliminating the need for toxic chemical crosslinkers while maintaining the sustained-release effect. This parameter change from chemical to physical crosslinking resolves the contradiction between sustained-release performance and residual toxicity.
Solution Approach 2:
The patent uses degradable polymer microspheres that break down into harmless byproducts after releasing the drug. These short-living microsphere carriers are designed to degrade completely in the body, eliminating persistent toxic residues. The temporary nature of these carriers provides sustained drug release while ensuring no long-term harmful accumulation.
3Duration of action of moving object
If local anesthetic drugs are administered at high doses to extend analgesia time, then the duration of action is improved, but the risk of cardio cerebral side effects increases
Solution Approach 1:
The patent implements continuous controlled release of the anesthetic drug through the hydrogel-microsphere system. Instead of administering high doses intermittently, the system provides a continuous, low-dose release profile that maintains therapeutic effect over extended periods. This continuous action at lower concentrations achieves prolonged analgesia while staying below toxic thresholds for cardio cerebral side effects.
Solution Approach 2:
The degradable polymer microspheres provide periodic drug release as they gradually degrade over time. This periodic release pattern, combined with the hydrogel's sustained release, creates a multi-phase release profile that extends analgesia duration without requiring high initial doses, thereby reducing the risk of acute cardio cerebral side effects.
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 system achieves prolonged analgesia with reduced frequency of administration, lower systemic side effects, and improved safety by using a biocompatible and degradable hydrogel that slowly releases drugs, maintaining efficacy and minimizing toxicity and environmental impact.
Implementation Method 1
thermosensitive modified chitin hydrogel... gel transition temperature of the thermosensitive modified chitin is lower than a body temperature
Implementation Method 2
release the drug slowly at the site, thereby prolonging the analgesia time
Data Source
AI summary
The invention discloses a thermosensitive modified chitin hydrogel local anesthetic-loaded sustained-release analgesia system, a preparation method and use. A thermosensitive chitin derivative is dissolved into water at a low temperature, a local anesthetic and analgesic drug aqueous solution or degradable polymer microspheres loaded with local anesthetic and analgesic drugs are added under a liquid state, the above materials are evenly mixed at a low temperature, the obtained mixture is injected into a site needing local anesthesia and analgesia so as to quickly form a gel under a body temperature and release the drug. The local anesthetic drug sustained-release analgesia composite hydrogel system is mainly characterized in that preparation is simple, organic solvents are not used, the local anesthetic and analgesic drug can be slowly released, and the problems that the existing local anesthetic drugs have a short action time are solved partly.