Wound Dressing Beveled Edge Production via Compression and Ultrasonic Cutting
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Solution Overview
Problem
Existing methods for producing multi-layer wound dressings with hydrogel and polymer foam layers face challenges in creating beveled edges, as thermal cutting methods are hindered by the hydrogel's energy absorption, and processes involving uncured polymer mixtures are not applicable, limiting the creation of complex edge structures.
Innovation Solution
A method involving a laminate with a porous layer and a wound contact layer, where a stencil is used to compress and cut the laminate, allowing for precise shaping and edge formation, including flattened edges, using magnetic forces for efficient processing and ultrasonic cutting for edge creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If thermal cutting methods are used to create beveled edges on wound dressings, then edge shaping is achieved, but the hydrogel layer absorbs thermal energy and hinders the cutting process
Solution Approach 1:
The patent replaces thermal cutting methods with mechanical compression and ultrasonic cutting methods. A compression mold is used to compress the laminate at the edges to form a densified layer, followed by ultrasonic cutting to create precise beveled edges. This mechanical approach avoids the thermal energy absorption problem caused by the hydrogel layer.
Solution Approach 2:
The patent changes the physical parameters of the foam layer through compression, creating a densified layer with different density characteristics. This parameter change allows the edge to be shaped without relying on thermal cutting, thereby avoiding the hydrogel's thermal energy absorption issue.
2Shape
If processes involving uncured polymer mixtures are used for edge shaping, then complex edge structures can be created, but these processes are not applicable to gel-foam laminates
Solution Approach 1:
The patent replaces chemical processes involving uncured polymer mixtures with mechanical compression and ultrasonic cutting methods. The compression mold mechanically densifies the foam layer at the edges, and ultrasonic cutting mechanically shapes the edge, making the process universally applicable to gel-foam laminates without relying on chemical reactivity.
Solution Approach 2:
The patent employs ultrasonic vibration for cutting the compressed laminate to create precise beveled edges. This mechanical vibration-based cutting method is universally applicable to cured foam-gel laminates and does not require the material to be in an uncured state, thereby solving the adaptability issue.
3Reliability
If the dressing edge contacts the surrounding skin, then the dressing can be secured, but considerable stress is placed on the skin
Solution Approach 1:
The patent creates beveled (angled) edges on the wound dressing instead of sharp or flat edges. This geometric modification allows the dressing to taper gradually at the edges, reducing the concentration of mechanical stress on the surrounding skin while maintaining adequate contact for securation. The angled edge profile distributes pressure more evenly across the skin surface.
4Manufacturing precision
If a stencil is used to compress the laminate for edge shaping, then precise shaping is achieved, but the process requires additional equipment and steps
Solution Approach 1:
The compression mold serves multiple functions: it compresses the foam layer to create a densified edge layer, defines the edge geometry through its mold shape, and prepares the edge for subsequent ultrasonic cutting. This multi-functional tool achieves precise shaping while consolidating several operations into a single device.
Solution Approach 2:
The stencil or compression mold is used in advance to pre-compress and pre-shape the laminate edges before the final ultrasonic cutting step. This preliminary action creates a densified layer that is easier to cut precisely and reduces the complexity of the final cutting operation.
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
Enables the efficient, precise, and reliable production of wound dressings with three-dimensional structures and flattened edges, suitable for automated series production, promoting wound healing by maintaining a moist environment and reducing skin stress.
Implementation Method 1
compressing a partially cured foam at the edges. The foam present in the edge area then has a higher density compared to the central area
Implementation Method 2
ultrasonic cutting for edge creation
Implementation Method 3
maintaining a moist environment
Data Source
Figure 1
Figure 2a~2b
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AI summary
The present invention relates to a method for producing a wound dressing and to a wound dressing produced accordingly.