Negative Pressure Wound Dressing With Perforated Adhesive Sealing
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Solution Overview
Problem
Conventional wound dressings face issues with adhesive skin contact layers that either lose breathability due to perforation closure or fail to adhere properly, leading to fluid accumulation and air leaks, while absorbent layers often become stiff and inefficient, causing discomfort and hygiene issues.
Innovation Solution
A wound dressing with an adhesive skin contact layer having perforations between 1.25 mm and 5.00 mm in diameter and a weight of 40 gsm to 250 gsm, combined with an absorbent structure, maintains breathability and adhesion, preventing tissue ingrowth and ensuring airtight sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diameter of perforations in the adhesive skin contact layer is increased to improve breathability, then water vapour and gas can pass through more easily, but adhesion of the skin contact layer to the dermal surface is reduced, causing the dressing to detach
Solution Approach 1:
The patent applies parameter changes by specifying perforation diameters within the range of 0.5mm to 2.0mm (with preferred ranges of 0.6-1.5mm or 0.7-1.2mm). This optimized parameter range resolves the contradiction by finding the sweet spot where breathability is sufficient while adhesion remains effective, preventing both perforation closure and dressing detachment.
2Reliability
If the diameter of perforations is decreased to improve adhesion, then the skin contact layer adheres better to the dermal surface, but breathability is reduced, causing fluid accumulation at the wound site
Solution Approach 1:
The patent resolves this contradiction by establishing the perforation diameter within the optimized range of 0.5mm to 2.0mm. This parameter change ensures that perforations are large enough to maintain breathability and prevent fluid accumulation, yet small enough to preserve adhesion strength and prevent dressing detachment.
3Quantity of substance
If absorbent material is used to collect exudate, then fluid handling capacity is improved, but the dressing becomes bulky and less portable
Solution Approach 1:
The patent applies this principle by using a thin, flexible adhesive skin contact layer with integrated perforations that acts as both the adhesive interface and a breathability management system. This eliminates or reduces the need for bulky separate absorbent canisters, achieving exudate management through the thin film structure itself while maintaining portability.
Solution Approach 2:
The patent merges the functions of the adhesive skin contact layer with breathability and exudate management functions. By integrating perforations directly into the adhesive layer, the patent combines multiple functions (adhesion, breathability, and fluid management) into a single thin component, reducing overall dressing volume while maintaining exudate absorption capacity.
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 solution provides optimal wound healing conditions by maintaining breathability and adhesion, preventing fluid pooling, and ensuring reliable negative pressure application without air leaks, enhancing user comfort and hygiene.
Implementation Method 1
the adhesive skin contact layer is a perforated mesh comprising perforations each having a diameter of between 1.25 mm and 5.00 mm
Implementation Method 2
an absorbent structure arranged between the backing layer and the adhesive skin contact layer
Data Source
AI summary
A negative pressure wound dressing the dressing comprising a backing layer, an adhesive skin contact layer and an absorbent structure arranged between the backing layer and the adhesive skin contact layer, wherein the adhesive skin contact layer is configured to detachably adhere the dressing to a dermal surface, wherein the backing layer comprises a coupling member configured to connect the dressing to a negative pressure source, wherein the absorbent structure comprises a wound contact layer arranged to contact the wound when the adhesive skin contact layer is adhered to the dermal surface, a transmission layer overlying the wound contact layer, and an absorbent layer overlying the transmission layer, further wherein the wound contact layer may be formed of sodium carboxymethylcellulose fibres having a degree of substitution of between 0.05 carboxymethyl groups per glucose unit and 0.50 carboxymethyl groups per glucose unit, and the absorbent layer may be a superabsorbent layer.