Biological Wound Dressing Using Non-Aldehyde Fixatives
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Solution Overview
Problem
Current biological wound dressings face issues with tissue compatibility, mechanical strength, flexibility, gas permeability, and bacterial barrier properties, often resulting in residual toxicity and poor application properties due to the use of synthetic materials and traditional fixation methods.
Innovation Solution
A biological wound dressing is developed using animal tissue substrates crosslinked with non-aldehyde fixatives, minimizing antigens through the use of low molecular weight organic acid anhydrides and guanidine compounds to alter protein configurations, and incorporating an active layer for enhanced biocompatibility and antibacterial properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional glutaraldehyde fixation and chrome tanning method are used on pig skin, then the wound dressing can be produced, but residual toxicity and potential rejection reactions occur due to incomplete elimination of antigens
Solution Approach 1:
The patent extracts and removes antigenic components from the pig skin substrate through enzymatic treatment and chemical processing, specifically eliminating the harmful antigenic substances while retaining the beneficial structural properties of the wound dressing material
Solution Approach 2:
The patent converts the harmful antigenic properties of pig skin into beneficial features by using controlled antigen elimination processes that remove toxic components while preserving or enhancing the biocompatibility and wound healing properties of the final product
2Duration of action of stationary object
If pig skin is processed using traditional methods, then wound dressing can be produced, but flexibility is reduced with enlarged pores after drying
Solution Approach 1:
The patent applies parameter changes by controlling the drying process conditions, crosslinking density, and pore structure characteristics to achieve an optimal balance between durability and flexibility, preventing excessive pore enlargement while maintaining structural integrity
Solution Approach 2:
The patent creates a composite structure by combining pig skin基质 with additional polymers or crosslinking agents that reinforce the structure without compromising flexibility, maintaining both durability and ease of application
3Reliability
If collagen is used for wound dressing, then tissue compatibility is improved, but mechanical strength is poor and requires reinforcement with synthetic film
Solution Approach 1:
The patent creates a composite material system combining natural collagen or pig skin基质 with synthetic reinforcement layers or crosslinking agents, achieving both high tissue compatibility and adequate mechanical strength through the synergistic combination of biocompatible and structurally strong components
4Reliability
If chitin and chitin-collagen composite materials are used, then protective films can be produced, but mechanical strength, durability, and flexibility are poor
Solution Approach 1:
The patent develops optimized composite materials by combining chitin or chitin-collagen with reinforcing agents, crosslinking polymers, or structural support layers, achieving an improved balance between biocompatibility and mechanical properties through careful selection and integration of complementary materials
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 resulting wound dressing is lightweight, flexible, gas permeable, and resistant to bacterial penetration, with improved tissue compatibility and wound healing promotion, while avoiding residual toxicity and enhancing application properties.
Implementation Method 1
crosslinking and fixing the substrate with non-aldehyde fixatives
Implementation Method 2
utilizing an active reagent selected from low molecular weight organic acid anhydride, acyl chloride, or acylamide, to block specific active groups, such as -OH, -NH2, —SH, in the proteins of the substrate
Implementation Method 3
utilizing a reagent with strong hydrogen bonding power, being a guanidine compound, to replace the specific hydrogen bonding in the spiral chains of the protein molecules in the substrate and alter its specific conformation
Data Source
Figure 1
AI summary
A biological wound dressing is made by a method that includes the steps of providing a natural animal tissue that has a substrate (1), crosslinking and fixing the substrate (1), minimizing the antigens from the substrate (1), and incorporating an active layer (2) in the substrate (1).