Polyurethane Foam Dressing With One-Sided Waterproof Adhesion
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Solution Overview
Problem
Existing medical polyurethane foam dressings lack single-side waterproofing and are prone to displacement on wounds, compromising continuous liquid absorption and stability.
Innovation Solution
A medical polyurethane foam dressing comprising a polyurethane film, hydrophilic polyurethane foam layer, release paper, and soft silicone composite layer with defined through holes, providing single-side water proofing and stable adhesion to the wound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gauze dressings are used, then the dressing is simple and easy to manufacture, but the resilience and liquid absorption performance are poor
Solution Approach 1:
The patent employs composite materials by combining polyurethane foam with a polyurethane film coating to create a dressing that integrates both high liquid absorption capability and single-side waterproofing functionality, resolving the contradiction between performance and structural simplicity
Solution Approach 2:
The polyurethane film is applied selectively on one side of the foam layer, providing waterproofing only where needed (outer surface) while maintaining absorption capability on the wound-contact side, thus improving performance without excessive complexity
2Reliability
If polyurethane foam is used for absorption, then the liquid absorption performance is superior, but the dressing is prone to displacement on the wound
Solution Approach 1:
By combining foam material with a film coating that has adhesive properties, the dressing achieves both superior liquid absorption and stable adhesion to the wound surface, eliminating the displacement problem while maintaining absorption performance
3Reliability
If polyurethane foam is used, then the resilience and pressure absorption are improved, but single-side waterproofing is not provided
Solution Approach 1:
The polyurethane film coating is applied specifically on the outer surface of the foam layer, providing waterproofing functionality only where required, while the inner foam structure maintains its pressure absorption and resilience properties
Solution Approach 2:
The combination of foam and film creates a composite structure that integrates pressure absorption capability with selective waterproofing, enabling the dressing to perform multiple functions simultaneously
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
Ensures continuous and stable liquid absorption while preventing displacement, enhancing wound care by maintaining a stable dressing on the wound.
Implementation Method 1
medical polyurethane foam has better resilience, slow pressure release and pressure absorption, and has superior liquid-seeping absorption performance
Implementation Method 2
it is sticky and can be stably fixed on the wound without easy displacement
Data Source
AI summary
A medical polyurethane foam dressing and a preparation method thereof are provided in this disclosure. The medical polyurethane foam dressing includes a polyurethane film, a hydrophilic polyurethane foam layer compounded on the polyurethane film, a release paper provided on the hydrophilic polyurethane foam layer, and a soft silicone composite layer located below the release paper. The polyurethane film consists of a release film and a PU resin layer or TPU resin layer coated on the release film. Products prepared according to the disclosure not only can serve to absorb wound exudate of pressure sore, but also provides single-side water proofing; and it is sticky and can be stably fixed on the wound without easy displacement, thus ensuring continuous and stable liquid absorption.