Chitosan Stenting Paste for Sinus Post-Operative Care
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Solution Overview
Problem
Traditional sinus surgery packing methods are painful and invasive, and existing sinus sealants do not effectively address the need for a biodegradable, antimicrobial, and mucoadhesive solution for post-operative care that can be easily applied and removed without causing discomfort or complications.
Innovation Solution
A chitosan-based paste is developed, which is biodegradable, antimicrobial, and mucoadhesive, formulated with high concentrations of water-soluble chitosan and an osmolality reducing agent in a phosphate-containing solution, allowing for easy application and removal, providing a conformal coating that adheres to mucosal tissues and promotes healing while preventing bacterial colonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gauze packing is used for post-operative sinus care, then the sinus passage is supported and excess fluid is absorbed, but the patient experiences pain and discomfort during application and removal
Solution Approach 1:
The invention changes the physical and chemical parameters of the packing material by using a biodegradable chitosan-based paste with specific viscosity (50-5000 cP), pH (3-7), and osmolality (200-800 mOsm/kg) characteristics. This paste can be injected through a syringe and forms a gel-like structure that adapts to the sinus cavity shape, eliminating the need for mechanical insertion and removal of traditional gauze packs, thereby reducing pain and discomfort while maintaining reliable sinus passage support
Solution Approach 2:
The chitosan-based paste is designed as a biodegradable, temporary packing material that naturally degrades over time (residence time of several days to weeks) without requiring surgical removal. The paste is absorbed or extruded by the body's natural processes, making it a disposable solution that eliminates the harmful effects associated with removing traditional gauze packing
2Object-affected harmful factors
If sinus sealant is used to protect post-operative sinus passageways, then less intrusion and pain are experienced, but the sealant must be biodegradable and easily applied through a syringe
Solution Approach 1:
The invention carefully controls the rheological and chemical parameters of the chitosan paste to achieve optimal dispensability through a syringe. The paste has a viscosity range of 50-5000 cP and exhibits shear-thinning behavior, allowing it to flow easily during injection but maintain structure after deposition. The pH (3-7) and osmolality (200-800 mOsm/kg) are adjusted to ensure biocompatibility and minimize tissue irritation, while the biodegradable nature ensures safe resorption over time
Solution Approach 2:
The sealing paste is formulated as a composite material containing chitosan as the primary biopolymer, combined with other biocompatible components that enhance its gel-forming capability, antimicrobial properties, and degradation characteristics. This composite structure allows the material to be injected as a paste, set in place, and then gradually degrade without requiring removal, minimizing patient discomfort while ensuring ease of application
3Reliability
If chitosan paste is used for stenting internal tissue, then the paste provides conformal coating and promotes healing, but the paste must maintain stability during storage and application
Solution Approach 1:
The invention optimizes the chemical composition parameters of the chitosan paste, including pH (3-7), osmolality (200-800 mOsm/kg), and viscosity (50-5000 cP), to achieve a balance between storage stability and tissue adhesion. The paste remains stable during storage but undergoes controlled gelation upon contact with tissue fluids, forming a conformal coating that adheres to mucosal surfaces and promotes healing while maintaining compositional stability throughout the application process
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 chitosan paste effectively reduces pain and inflammation, prevents bacterial reinfection, and supports tissue healing by maintaining a moist environment, promoting ciliary regrowth and reducing adhesions, with a residence time of several days to weeks, and can be easily dispensed through a syringe for precise application.
Implementation Method 1
mucoadhesive, formulated with high concentrations of water-soluble chitosan... providing a conformal coating that adheres to mucosal tissues
Implementation Method 2
biodegradable, antimicrobial, and mucoadhesive... preventing bacterial colonization
Implementation Method 3
formulated with high concentrations of water-soluble chitosan and an osmolality reducing agent... effectively reduces pain and inflammation
Implementation Method 4
Packing or biomaterial stents that dissolve or otherwise degrade over a certain period are desirable... biodegradable
Data Source
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AI summary
Nasal or sinus sites are treated with a ready-to-use paste having a high concentration of a water-soluble chitosan and an osmolality reducing agent dissolved in a phosphate- containing solution. The ingredients provide a paste at room temperature and have a pH of at least 4. The osmolality reducing agent does not crosslink with the water-soluble chitosan. The paste provides stenting, adheres to the nasal or sinus site and has a residence time of at least 1 day.