Multiphase Hydrogel Structure for Tissue Adhesion Prevention
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Solution Overview
Problem
Current antiadhesive materials used in surgery often disrupt the structural integrity of tissues due to chaotropic effects, leading to undesirable tissue adhesion and inflammation, as they degrade into chaotropic byproducts that denature proteins and nucleic acids.
Innovation Solution
A multiphasic hydrogel system comprising distinct gel and solid phases, where the gel phase provides a temporary barrier and the solid phase offers a tissue scaffold, with controlled release of biologically active agents to modulate cellular events and reduce tissue adhesion, inflammation, and promote healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antiadhesive materials are used to prevent tissue adhesion, then tissue separation is improved, but tissue integrity is disrupted due to chaotropic effects and protein denaturation
Solution Approach 1:
The patent converts the harmful chaotropic effect into a beneficial mechanism by using controlled protein denaturation at the material surface to create a protective layer of denatured proteins that prevents further tissue adhesion while minimizing damage to underlying healthy tissue. The denaturation is localized and controlled rather than widespread and destructive.
Solution Approach 2:
The antiadhesive material exhibits different properties at different locations: the surface layer is designed to undergo controlled denaturation to prevent adhesion, while the bulk material maintains structural integrity and does not denature proteins. This spatial differentiation of properties allows the material to prevent adhesion without causing widespread tissue damage.
2Object-affected harmful factors
If absorbable materials are used to minimize site colonization, then long-term infection risk is reduced, but chaotropic byproducts are generated that denature macromolecules
Solution Approach 1:
The patent extracts or removes the chaotropic component from the degradation process by designing materials that degrade into non-chaotropic byproducts. The material is engineered to break down into benign substances that do not disrupt macromolecular structure, thereby eliminating the harmful effect while retaining the benefit of absorbability and reduced infection risk.
Solution Approach 2:
The patent changes the chemical parameters of the degradation products by selecting specific polymer compositions and crosslinking densities that result in non-chaotropic degradation byproducts. The material is designed to degrade into substances with specific molecular weight ranges and chemical compositions that do not exhibit chaotropic properties, thus preventing protein denaturation.
3Strength
If hydrophobic effects are disrupted to allow material interaction with tissue, then material-tissue bonding is improved, but hydrophobic boundaries between tissue layers are compromised leading to adhesion
Solution Approach 1:
The material is designed with heterogeneous surface properties where specific regions have hydrophobic characteristics for strong tissue bonding while other regions maintain hydrophilic characteristics to preserve tissue layer boundaries. This spatial differentiation allows the material to simultaneously achieve strong attachment and prevent adhesion between tissue layers.
Solution Approach 2:
The patent uses composite materials combining hydrophobic and hydrophilic components in a single structure. The hydrophobic portions provide strong tissue bonding through hydrophobic interactions, while the hydrophilic portions maintain the hydrophobic boundaries between tissue layers, preventing adhesion. The composite structure allows both functions to coexist without compromising either.
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 multiphasic hydrogel system effectively prevents tissue adhesion and inflammation by maintaining tissue integrity, promoting healing, and facilitating controlled drug delivery, while avoiding chaotropic effects.
Implementation Method 1
Ground substance is amorphous, gel-like, and is primarily composed of glycosaminoglycans (most notably hyaluronan), proteoglycans, and glycoproteins
Implementation Method 2
Cells are surrounded by extracellular matrix in tissues, which acts as a support for the cells
Implementation Method 3
controlled release of biologically active agents to modulate cellular events
Data Source
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AI summary
Disclosed are hydrogels polymerized with or around a solid biofunctional moiety, biodegradable or permanent, designed to be implantable in a mammalian body, intended to block or mitigate the formation of tissue adhesions, and intended to aid in functional healing. The hydrogels of the present invention comprise multiphasic structural elements: a) at least one gel phase, b) at least one solid phase, c) optional polymeric chains connecting gel and solid phases, d) optional shape designs that provide for an interpenetrating geometry between gels and solids, e) optional shape designs that enhance a tissue-hydrogel interface, and f) optional shape designs that provide a biofunctional aspect. The hydrophobicity of the various phases is chosen to reduce tissue adhesion and enhance tissue healing. The gel phase polymer morphology is typically of high molecular weight and has morphology that encourages entanglement. Useful polymeric structures include branching chains, comb or brush, and dendritic morphologies.