Biocompatible Wound Dressing with Hydrogel Release Layer
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Solution Overview
Problem
Existing wound dressings, particularly those using vacuum-induced healing, face challenges in promoting tissue growth and closure, especially in large or infected wounds, as they often require mechanical closure methods that can cause tissue stress and are not compatible with cell growth-enhancing modalities, and frequent dressing changes can damage growing tissue.
Innovation Solution
A multi-layer reduced pressure delivery system with a scaffold, a hydrogel-forming release layer, and a distribution manifold that applies reduced pressure to promote tissue growth, allowing for cell growth enhancement without disrupting existing vacuum therapy protocols and minimizing tissue damage during dressing changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical closure methods (sutures or staples) are used to close wounds, then wound closure is achieved, but tissue stress and tension increase causing tissue rupture and wound dehiscence
Solution Approach 1:
The patent replaces mechanical closure systems (sutures and staples) with a biological closure system using living cells and growth factors. The composition includes cells capable of migration and proliferation, along with growth factors that stimulate tissue regeneration, allowing wounds to close through biological processes rather than mechanical force, thereby eliminating tissue stress and tension at insertion points
Solution Approach 2:
The invention changes the fundamental parameter of wound closure from mechanical force application to biochemical stimulation. By introducing growth factors (such as PDGF, FGF, VEGF) and living cells into the wound bed, the closure mechanism transitions from external mechanical tension to internal biological regeneration, fundamentally altering how wound closure occurs and eliminating the harmful tissue stresses associated with traditional methods
2Reliability
If frequent dressing changes are performed on wounds using traditional V.A.C. therapy, then wound drainage is maintained, but binding of cellular tissue to the wound dressing occurs causing tissue damage during removal
Solution Approach 1:
The patent employs a disposable foam dressing that is designed to be replaced frequently without causing tissue damage. The foam structure provides a non-adherent surface that allows dressing changes to occur without pulling on or damaging the delicate granulation tissue, enabling maintenance of wound drainage while eliminating the tissue binding problem associated with traditional dressings
Solution Approach 2:
The invention uses a flexible foam dressing structure that conforms to the wound cavity and provides a soft, compliant interface with the healing tissue. This flexible foam layer allows for frequent dressing changes without the rigid or adhesive properties that cause traditional dressings to bind to cellular tissue, thereby preventing damage during removal while maintaining effective wound drainage
3Ease of manufacture
If large or infected wounds are treated without vacuum therapy, then traditional treatment methods are used, but prolonged hospitalization and major surgical procedures are required
Solution Approach 1:
The patent merges two previously separate treatment approaches into a single integrated system: vacuum-assisted closure technology and biological wound healing promotion. By combining the physical drainage mechanism of V.A.C. therapy with the biological activation of growth factors and living cells, the system accelerates wound healing in large and infected wounds, reducing hospitalization time and avoiding the need for major surgical procedures while maintaining treatment simplicity
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 system effectively promotes tissue growth and closure by applying reduced pressure through a scaffold while preventing tissue ingrowth into the manifold, allowing for easier dressing changes and combining with existing vacuum therapy without loss of performance or increased cost.
Implementation Method 1
The release layer includes a hydrogel-forming material and a plurality of flow channels, and the manifold layer includes a distribution manifold. The release layer is positioned between the tissue contact layer and the manifold layer, and the hydrogel-forming material of the release layer binds to at least one of the tissue contact layer and the manifold layer.
Implementation Method 2
When applied over a sufficient area of the wound, such negative pressures have been found to promote the migration toward the wound of epithelial and subcutaneous tissues.
Implementation Method 3
The tissue contact layer includes a scaffold adapted to contact the tissue site
Data Source
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AI summary
A multi-layer reduced pressure delivery apparatus is provided for applying reduced pressure tissue treatment to a tissue site. The multi-layer apparatus includes a tissue contact layer, a release layer, and a manifold layer. The tissue contact layer includes a scaffold adapted to contact the tissue site, the release layer includes a hydrogel-forming material and a plurality of flow channels, and the manifold layer includes a distribution manifold. The release layer is positioned between the tissue contact layer and the manifold layer to allow easy release of the manifold layer from the tissue contact layer following the administration of reduced pressure tissue treatment.