Self-supporting Interface Dressing with Hydrophobic Matrix
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Solution Overview
Problem
Current interface dressings, such as Urgotul®, lack conformability due to their rigid framework, making them unsuitable for difficult-to-cover wounds like those on the fingers or joints, and existing self-supporting options either degrade over time or are not market-ready.
Innovation Solution
A self-supporting interface dressing composed of a hydrophobic matrix with a styrene-saturated olefin-styrene triblock copolymer, plasticizer, and petroleum jelly, specifically chosen for viscosity and proportions to ensure flexibility, cohesion, and non-adherence, along with optional hydrocolloids and antioxidants, to maintain optimal healing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid framework is used to provide structural support, then the dressing maintains its shape and strength, but the conformability to difficult-to-cover wounds (fingers, joints) deteriorates
Solution Approach 1:
The patent replaces the rigid framework with a flexible foam structure that can conform to irregular wound surfaces while maintaining structural integrity. The foam material provides both support and adaptability, eliminating the need for a rigid mesh framework.
Solution Approach 2:
The invention uses a composite structure combining a flexible foam core with adhesive layers and protective films. This composite approach allows the dressing to maintain shape through the foam's structural properties while achieving conformability through the flexibility of the materials and their layered construction.
2Adaptability or versatility
If the dressing is made thinner to improve conformability, then the adaptability to wound surfaces improves, but the cohesion and resistance to tearing during handling deteriorates
Solution Approach 1:
The patent employs a composite structure with multiple layers including a foam core, adhesive layers, and protective films. This multi-layer composite provides both thinness for conformability and sufficient cohesion through the combined strength of all layers, preventing tearing during handling.
Solution Approach 2:
The use of flexible foam and thin film materials allows the dressing to maintain adequate thickness for strength while achieving thinness in critical areas for conformability. The flexible nature of these materials provides tear resistance even at reduced thickness.
3Adaptability or versatility
If an elastomeric matrix with unsaturated blocks (isoprene) is used to achieve flexibility, then the conformability improves, but the stability over time deteriorates due to oxidation and degradation
Solution Approach 1:
The patent changes the chemical composition of the elastomeric matrix by replacing unsaturated isoprene blocks with saturated polyethylene blocks in a triblock copolymer structure. This parameter change maintains flexibility while eliminating the oxidation susceptibility of unsaturated bonds, ensuring long-term stability.
Solution Approach 2:
By using a saturated polymer composition that is resistant to degradation, the dressing maintains its properties throughout its intended lifespan as a disposable product, ensuring reliable performance until removal without premature degradation from oxidation.
4Strength
If a framework structure is used to provide self-support, then the structural integrity improves, but the transparency to allow wound monitoring deteriorates
Solution Approach 1:
The patent replaces the opaque framework with a transparent or translucent foam structure that allows visual monitoring of the wound through the dressing. The foam maintains self-support through its cellular structure while its transparency enables caregivers to observe wound healing without removing the dressing.
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 a conformable, self-supporting dressing that maintains healing properties over time, prevents adhesion, and promotes wound healing without degrading, addressing the limitations of existing products.
Implementation Method 1
a styrene-saturated olefin-styrene triblock copolymer, having a viscosity of between 0.2 and 2 Pa.s, as measured in a 10% (mass/mass) solution in toluene
Implementation Method 2
from 400 to 1220 parts by weight of a plasticizer, preferably a plasticizing oil; and from 0 to 720 parts by weight of petroleum jelly
Implementation Method 3
said dressing being formed from a thin layer of a composition comprising a hydrophobic matrix
Data Source
AI summary
The present invention relates to a self-supporting interface dressing formed by a thin layer of a composition comprising a hydrophobic matrix and having through-holes. According to the invention, this hydrophobic matrix comprises, for 100 parts by weight of a styrene/saturated olefin/styrene triblock copolymer with a viscosity of between 0.2 and 2 Pa.s, as measured in a 10% (weight/weight) solution in toluene, from 400 to 1,220 parts by weight of a plasticizer, preferably a plasticizer oil, and from 0 to 720 parts by weight of petroleum jelly, it being additionally specified that the total quantity of plasticizer and of petroleum jelly is greater than or equal to 750 parts by weight, and the quantity of petroleum jelly is between 400 and 720 parts by weight when the quantity of plasticizer is between 1,000 and 1,220 parts by weight. Application to the treatment of wounds.