Thermosensitive Submucosal Injection for Stable ESD Elevation
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Solution Overview
Problem
Current submucosal injections for endoscopic submucosal dissection (ESD) fail to maintain stable mucosal layer elevation, leading to prolonged procedure times and increased complications such as perforation and bleeding, due to rapid absorption and mucosal damage, and lack suitable alternatives for widespread use.
Innovation Solution
A thermosensitive submucosal injection is prepared using high-pH chitosan, polyvinylpyrrolidone, calcium ions, and disodium β-glycerophosphate to form a three-dimensional molecular-coupled gel that supports mucosal elevation, incorporating hemostatic drugs and growth factors for sustained release, enhancing stability and wound healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If normal saline is used for submucosal injection, then the injection is isotonic and easy to administer, but it is rapidly absorbed by surrounding tissues causing significant decrease in mucosal layer elevation height within 5 minutes
Solution Approach 1:
The patent changes the tonicity parameter of the injection solution from isotonic (normal saline) to hypertonic (containing sodium chloride at 0.9%-2.0%, glucose at 5%-25%, or glycerol fructose at 10%-30%). This parameter change increases the osmotic pressure, preventing rapid absorption by surrounding tissues and maintaining mucosal elevation for extended periods (above 50% of initial height after 20 minutes).
Solution Approach 2:
The patent creates a composite injection solution combining multiple components: hypertonic agents (sodium chloride, glucose, or glycerol fructose), hyaluronic acid (0.1%-1.0%), and medical colorants (methylene blue or indigo carmine at 0.04%-0.2%). This composite formulation achieves both prolonged elevation duration and reduced mucosal damage compared to single-component solutions.
2Reliability
If hypertonic saline, glucose solutions, or glycerol fructose injection are used, then improved efficacy is achieved compared to normal saline, but the maintenance of mucosal elevation remains suboptimal with elevation height reducing to below 50% within 20 minutes and hypertonicity causes mucosal damage
Solution Approach 1:
The patent formulates a composite solution combining hypertonic agents with hyaluronic acid (0.1%-1.0%) and medical colorants. The hyaluronic acid component forms a protective gel matrix that reduces direct contact between hypertonic solutions and mucosal tissues, thereby mitigating mucosal damage while maintaining the elevation efficacy provided by the hypertonic agents.
Solution Approach 2:
The patent optimizes the concentration parameters of hypertonic agents (sodium chloride at 0.9%-2.0%, glucose at 5%-25%, or glycerol fructose at 10%-30%) within specific ranges that balance elevation efficacy with tissue tolerance. This parameter optimization ensures sustained elevation above 50% of initial height after 20 minutes while minimizing mucosal injury.
3Duration of action of moving object
If hyaluronic acid is used for submucosal injection, then prolonged mucosal elevation is achieved, but it is expensive and carries the risk of stimulating residual tumor tissue growth
Solution Approach 1:
The patent uses hyaluronic acid not only for its primary function of prolonging mucosal elevation but also incorporates medical colorants (methylene blue or indigo carmine) that provide dual functionality: visual indication of injection sites and potential anti-proliferative effects on residual tumor tissue. This multi-functional approach addresses both the duration requirement and the concern about tumor stimulation.
4Reliability
If submucosal injections are performed to cause mucosal layer elevation, then better visual fields and operating space are provided to minimize vascular damage, but prolonged procedure time and high technical difficulty result in persistently high probability of complications
Solution Approach 1:
The patent employs a thermosensitive hydrogel formulation that undergoes phase transition from liquid to gel upon injection. The gelation process is dynamic and temperature-dependent, forming a stable gel structure at body temperature that maintains mucosal elevation throughout the procedure. This dynamic property eliminates the need for repeated injections, reducing procedure time while maintaining 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 injection provides rapid gel formation, stable mucosal elevation, reduces intraoperative and postoperative bleeding, and promotes wound healing, significantly improving the safety and efficiency of ESD procedures.
Implementation Method 1
chitosan solution with a high-pH value, a polyvinylpyrrolidone solution, a disodium β-glycerophosphate solution, and a calcium ion solution to obtain a thermosensitive submucosal injection solution capable of rapid gel formation
Implementation Method 2
thermosensitive submucosal injection solution capable of rapid gel formation
Data Source
AI summary
A method for preparing a thermosensitive submucosal injection for endoscopic submucosal dissection (ESD), relating to the technical field of regenerative medicine. The specific method involves constructing a novel thermosensitive submucosal injection solution capable of sustained-release hemostatic drugs and growth factors using high-pH chitosan, polyvinylpyrrolidone, calcium ions, and disodium β-glycerophosphate. This injection has very low viscosity, does not require special injection devices, is able to be injected using conventional endoscopic injection needles currently used in clinical practice, and exhibits high injection rate. Additionally, after being injected into the submucosal layer, this injection rapidly forms a high-strength hydrogel under body temperature, more stably supporting the raised state of the mucosal layer to facilitate ESD operations. It also reduces intraoperative and postoperative bleeding, promotes postoperative wound healing, and holds significant clinical practical application value.