Shear-Thinning Hydrogel for Adhesion Prevention
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Solution Overview
Problem
Current adhesion prevention technologies, such as polymer films and sprayable hydrogel solutions, are ineffective in fully preventing post-operative adhesions due to rapid degradation, inefficacy, and difficulty in handling during surgery, leading to significant clinical challenges and costs.
Innovation Solution
A shear-thinning, viscoelastic, and self-healing polymeric hydrogel is developed, comprising hydroxypropylmethylcellulose (HPMC) and poly(ethylene glycol)-block-poly(lactic acid) (PEG-PLA) nanoparticles, which can be applied to tissues to maintain separation and prevent adhesion formation by exhibiting tunable mechanical properties and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If polymer films or sprayable hydrogel solutions are used for adhesion prevention, then a physical barrier is formed between tissues, but the material degrades rapidly and loses effectiveness
Solution Approach 1:
The patent uses a composite hydrogel system combining hyaluronic acid (HA) with crosslinking agents and potential reinforcement particles to create a material that maintains structural integrity longer while preventing adhesion. The composite structure allows the hydrogel to resist degradation while maintaining its barrier function.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the hydrogel through controlled crosslinking density, molecular weight adjustment, and composition ratios to enhance durability. By changing these parameters, the hydrogel maintains its protective function for extended periods without rapid degradation.
2Reliability
If solid membranes are used to cover affected tissues, then adhesion prevention is provided, but complete coverage is difficult in areas with many surfaces
Solution Approach 1:
The patent employs sprayable hydrogel formulations that can be delivered as aerosols or mist to completely coat complex tissue surfaces. The liquid spray form allows penetration into crevices and complete coverage of irregular geometries, which is difficult to achieve with solid membranes.
Solution Approach 2:
The patent utilizes the ability to change the physical state of the hydrogel from liquid spray to gel barrier. The sprayable formulation allows easy application, and upon contact with tissue or air exposure, it transitions to a gel state that maintains the barrier function, combining ease of application with effective coverage.
3Ease of operation
If polymer solutions are used for adhesion prevention, then application is simplified, but the residence time at injured tissues is too short
Solution Approach 1:
The patent exploits phase transition of the hydrogel from liquid to gel state. The solution is applied easily in liquid form, then undergoes phase transition to gel through crosslinking or temperature change, which dramatically extends residence time at the tissue site while maintaining ease of initial application.
Solution Approach 2:
The hydrogel formulation contains self-crosslinking components that automatically trigger gelation at the application site without requiring additional steps. This self-service mechanism extends residence time automatically after application, combining ease of operation with prolonged duration of action.
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 hydrogel effectively reduces the incidence and severity of adhesions, maintaining its mechanical properties for an extended period, allowing natural movement between tissues and organs, and demonstrating excellent biocompatibility and ease of application, thereby addressing the limitations of existing adhesion prevention methods.
Implementation Method 1
The adhesion prevention hydrogel can be shear-thinning
Implementation Method 2
The adhesion prevention hydrogel can be shear-thinning, viscoelasticity, and rapid self-healing
Implementation Method 3
The adhesion prevention hydrogel can be shear-thinning, viscoelasticity, and rapid self-healing
Data Source
AI summary
A method of preventing tissue adhesion includes forming an incision in tissue, applying a hydrogel to tissue through the incision, and closing the incision with the hydrogel therein. The hydrogel includes a polymer non-covalently cross-linked with a plurality of nanoparticles and prevents a formation of adhesions between tissues and/or organs.