Silicone Wound Contact Layer for Leak-Safe Exudate Absorption
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Solution Overview
Problem
Current wound dressings fail to simultaneously optimize absorption of high amounts of wound exudate, provide a wound-healing environment, prevent leakage, adhere to skin without irritation, offer atraumatic properties, act as a barrier against external factors while allowing gas exchange, and maintain comfort for up to seven days without dressing change.
Innovation Solution
A wound dressing comprising a backing layer, absorbent pad, and wound contact layer with a distribution layer between them, utilizing specific materials and configurations to enhance absorption, adhesion, and comfort, including a moisture-vapor permeable backing layer, absorbent core with superabsorbent materials, and a silicone adhesive contact layer with controlled apertures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wound contact layer uses adhesive silicone to adhere to skin, then adhesion is improved, but removing the dressing may cause trauma or irritation
Solution Approach 1:
The patent changes the physical-chemical parameters of the adhesive by using a two-component system (silicone adhesive with specific Shore A hardness between 10-40 and a corresponding adhesive layer) that provides controlled adhesion strength. This allows the dressing to adhere reliably during wear but be removed without causing trauma to the wound or surrounding skin.
2Productivity
If the absorbent pad absorbs high amounts of exudate rapidly, then absorption capacity is improved, but the dressing may become too thick or rigid
Solution Approach 1:
The patent uses composite materials in the absorbent pad, combining superabsorbent polymers with other absorbent materials in specific ratios. This composite structure achieves rapid and high-capacity absorption while maintaining the flexibility and conformability needed for comfortable wearing over extended periods.
Solution Approach 2:
The dressing incorporates flexible film structures and thin-layer designs in the absorbent pad construction, allowing the pad to maintain high absorption capacity while remaining thin and flexible enough to adapt to different body contours and maintain comfort during extended wear.
3Reliability
If the backing layer is substantially liquid-impermeable to prevent leakage, then leakage prevention is improved, but gas exchange may be restricted
Solution Approach 1:
The backing layer is designed as a porous material with specific pore structures that are small enough to prevent liquid exudate leakage but large enough to allow gas molecules to pass through. This enables simultaneous leakage prevention and adequate gas exchange for wound healing.
Solution Approach 2:
The backing layer uses composite material structures combining liquid-impermeable properties with gas-permeable characteristics, achieving both leakage prevention and sufficient vapor transmission rate for wound respiration.
4Duration of action of stationary object
If the dressing is designed to be worn for up to seven days without change, then duration of action is improved, but comfort and skin irritation may worsen
Solution Approach 1:
The patent optimizes multiple parameters including adhesive strength, absorbent capacity, and breathable properties to maintain effective performance throughout seven days of continuous wear. The silicone adhesive with controlled Shore A hardness provides sustained adhesion without excessive skin stress, while the absorbent pad maintains appropriate moisture balance to prevent maceration and irritation over the extended wearing period.
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 dressing achieves rapid and complete absorption of exudate, maintains adhesion to skin for extended periods, prevents leakage, and ensures comfort by balancing adhesiveness and flexibility, while allowing gas exchange and preventing irritation.
Implementation Method 1
an absorbent core comprising a mixture of absorbent fibers and superabsorbent material
Implementation Method 2
superabsorbent material can comprise from 30% to 55% by weight of the absorbent core
Implementation Method 3
The backing layer is substantially liquid-impermeable but permeable for water vapor, suitably in form of a film material. The backing layer suitably has a moisture vapour transmission rate (MVTR) from 300 to 30000 g/m2/24 h
Data Source
AI summary
Wound dressing (10, 20) comprising a backing layer (11, 21), an absorbent pad (12, 22), and a wound contact layer (13, 23), the absorbent pad (12, 22) having an absorbent core (15, 25) wherein the backing layer (11, 21) comprises a water vapour-permeable and substantially liquid-impermeable film material, wherein the wound contact layer (13, 23) comprises a layer of skin-friendly silicone adhesive (13b, 23b), the wound contact layer (13, 23) comprising apertures (13c, 23c), each of the apertures (13c, 23c) having an average area of from 0,03 mm2 to 7,00 mm2, and the entire open area of the wound contact layer (13, 23) formed by the apertures (13c, 23c) is between 10% and 30%, characterized in that a distribution layer (14a, 24a) is arranged between the wound contact layer (13, 23) and the absorbent core (15, 25).