Bilayered Wound Dressing with Channels and Textured Surface
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Solution Overview
Problem
Current wound dressings, including synthetic and biosynthetic grafts, lack the ability to concurrently treat the dermis and epidermis, and often require multiple applications, leading to complications and increased patient discomfort due to the need for removal of top dressing layers, which disrupts epithelial cell migration and tissue formation.
Innovation Solution
A multilayered wound dressing comprising a first layer with channels for neovascularization and a second layer with a textured surface to facilitate directional cell growth, formed using additive manufacturing, allowing for simultaneous dermal and epidermal healing without the need for frequent dressing changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If synthetic skin grafts are used to enhance dermal healing, then dermal vascularization is improved, but the treatment time is extended up to 3 weeks and complications can occur
Solution Approach 1:
The wound dressing is divided into two distinct functional layers: a first layer with channels for neovascularization and dermal healing, and a second layer with textured surface for epidermal healing. This segmentation allows each layer to independently perform its specialized function, enabling concurrent treatment of both dermis and epidermis without the sequential delays associated with single-layer grafts.
Solution Approach 2:
The invention uses a composite structure combining two different polymeric materials with distinct properties - the first layer uses a polymer formulation optimized for vascularization and dermal regeneration, while the second layer uses a polymer with surface texture optimized for epidermal cell migration. This composite approach allows simultaneous optimization of both healing processes.
2Strength
If silicone-based top layer dressings are used for dermal regeneration, then dermal healing is enhanced, but the need to remove the top layer disrupts epithelial cell migration and increases patient discomfort
Solution Approach 1:
The invention merges the dermal regeneration function and epidermal healing function into a single integrated dressing structure. The second layer is permanently attached to the first layer, creating a continuous healing interface that eliminates the need to remove a top layer. This allows epithelial cells to migrate continuously across the textured surface while the dermal layer regenerates underneath, maintaining both dermal enhancement and patient comfort.
Solution Approach 2:
The textured surface of the second layer is pre-configured with micro-scale features that guide and facilitate epidermal cell migration from the beginning of the healing process. This preliminary structuring of the surface eliminates the need for later intervention to promote cell migration, allowing continuous healing without disruption when the dressing is eventually removed.
3Adaptability or versatility
If multiple dressing layers are applied for full-thickness wound treatment, then both dermis and epidermis can be treated, but the frequency of dressing changes increases and costs increase
Solution Approach 1:
The invention combines multiple functional dressing layers into a single integrated bilayered device. The first layer provides neovascularization and dermal healing capabilities, while the second layer provides epidermal healing with directional cell growth promotion. By merging these functions into one device with permanent bonding between layers, the invention eliminates the need for frequent dressing changes that would be required if separate layers were applied independently.
4Area of stationary object
If allografts are used for temporary wound coverage, then wound coverage is provided, but long culture times, fragility of grafts, and rejection rates remain substantial obstacles
Solution Approach 1:
The invention changes the fundamental parameters of the dressing material from biological tissue (allograft) to synthetic biocompatible polymers. This parameter change eliminates the issues of culture time, fragility, and rejection rates associated with allografts, while providing equivalent or superior wound coverage. The synthetic materials offer enhanced mechanical stability and biocompatibility without the immunological complications of donor tissue.
Data Source
AI summary
Disclosed herein is a multilayered wound dressing comprising a first layer; the first layer including channels that facilitate neovascularization of a wound; and a second layer in contact with the first layer, the second layer having the same or different chemical composition as the first layer; where the second layer comprises at least one surface that has a texture and the direction of the texture is operative to facilitate cell orientation and growth. A method includes forming a first layer of a polymeric material; forming a second layer of the same polymeric material as the first layer on the first layer; and forming a textured surface of the second layer of the same polymeric material as the first layer, the textured surface being operative to facilitate directional cell growth when used in a wound dressing, where the first layer and the second layer are formed using an additive manufacturing process.