Contracting-Layer Dressing for Negative-Pressure Wound Closure
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Solution Overview
Problem
The high cost and complexity of negative-pressure therapy systems pose challenges for manufacturers, healthcare providers, and patients, and mechanical closure methods like sutures can cause discomfort and additional injury.
Innovation Solution
A dressing system with a contracting layer that applies a closing force perpendicular to the tissue site using a material with perforations and a strut angle, collapsing under negative pressure to facilitate wound closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If negative-pressure therapy is applied to accelerate tissue growth and wound healing, then healing speed and tissue regeneration are improved, but system cost and operational complexity increase
Solution Approach 1:
The patent extracts the core function of negative-pressure therapy (applying closing force to wound edges) and implements it through a simplified mechanical dressing structure with a contracting layer, eliminating the need for complex vacuum pumps and pressure control systems while maintaining the therapeutic effect
Solution Approach 2:
The dressing is designed as a disposable mechanical device that provides the closing force function without requiring expensive, reusable equipment. The contracting layer with its specific geometry (perforations, strut angles) is engineered to deliver the necessary mechanical action in a single-use format, reducing overall system cost
2Productivity
If mechanical closure methods like sutures are used to close wounds, then wound closure is achieved, but patient discomfort and additional tissue injury increase
Solution Approach 1:
The patent replaces the traditional mechanical suture system (needles, threads, knots) with a distributed mechanical pressure system. The contracting layer applies continuous closing force through its collapsed structure, avoiding the puncture injuries and localized stress concentrations caused by sutures
Solution Approach 2:
The contracting layer incorporates a porous or perforated structure that allows distributed force application across the wound surface. This geometry enables the layer to collapse and apply closing force while maintaining tissue permeability and avoiding the concentrated mechanical trauma of suture points
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 provides effective wound closure with reduced patient discomfort and injury, while maintaining a healing environment, by applying a closing force parallel to the tissue surface.
Implementation Method 1
a negative-pressure source adapted to be fluidly coupled to the sealed space to provide negative pressure to the sealed space
Implementation Method 2
The holes may have a perforation shape factor and a strut angle causing the plurality of holes to collapse in a direction substantially perpendicular to the opening. The contracting layer may generate a closing force substantially parallel to the surface of the tissue site to close the opening in response to application of the negative pressure.
Data Source
AI summary
Systems, apparatuses, and methods for closing an opening through a surface of a tissue site are described. The system includes a sealing member adapted to cover the opening to form a sealed space and a negative-pressure source adapted to be fluidly coupled to the sealed space to provide negative pressure to the sealed space. The system also includes a contracting layer adapted to be positioned adjacent the opening and formed from a material having a firmness factor and a plurality of holes extending through the contracting layer to form a void space. The holes have a perforation shape factor and a strut angle causing the plurality of holes to collapse in a direction substantially perpendicular to the opening. The contracting layer generates a closing force substantially parallel to the surface of the tissue site to close the opening in response to application of the negative pressure.