Serially Deposited Fiber Mats for Porosity and Tissue Integration
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Solution Overview
Problem
Current medical appliances, such as stent grafts and vascular grafts, face challenges in achieving optimal biocompatibility and tissue integration due to limitations in material properties and structural design, particularly in terms of porosity, fiber alignment, and mechanical strength.
Innovation Solution
The use of serially deposited fiber mats and lattices, created through rotational spinning or electrospinning, which can be processed by heating and stretching to enhance fiber alignment, porosity, and mechanical properties, allowing for customizable layers with controlled porosity and fiber orientation to promote tissue integration and mechanical resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional materials and structures are used in medical appliances, then manufacturing simplicity is maintained, but biocompatibility and tissue integration are insufficient
Solution Approach 1:
The patent employs porous fiber mats and lattices with controlled pore sizes and distributions to enable tissue ingrowth and integration while maintaining mechanical strength. The porous structure allows cellular penetration and tissue formation, directly improving biocompatibility without requiring complex multi-component systems
Solution Approach 2:
The patent utilizes composite fiber structures combining different materials with complementary properties, such as biodegradable polymers with non-biodegradable reinforcement fibers. This composite approach achieves optimal biocompatibility and mechanical performance while maintaining relatively simple manufacturing processes
2Strength
If fiber alignment is increased through processing, then mechanical strength is improved, but porosity may be reduced
Solution Approach 1:
The patent implements spatially varying fiber alignment and porosity within the same structure, creating regions of high alignment for mechanical strength (e.g., load-bearing areas) and regions of high porosity for tissue integration (e.g., implant-tissue interface zones). This local differentiation resolves the contradiction by optimizing both properties in their respective locations
Solution Approach 2:
The patent transitions from two-dimensional fiber mats to three-dimensional lattice structures, where fibers are arranged in interconnected networks. This dimensional change allows simultaneous achievement of high mechanical strength through load distribution and high porosity through the open three-dimensional architecture
3Reliability
If porosity is increased to promote tissue integration, then biocompatibility is improved, but mechanical strength may be reduced
Solution Approach 1:
The patent employs specifically engineered porous structures with optimized pore size, shape, and distribution to maximize tissue integration while maintaining mechanical integrity. The porous architecture facilitates cellular infiltration and tissue formation without compromising the load-bearing capacity of the implant
Solution Approach 2:
The patent combines porous biodegradable polymer matrices with non-biodegradable reinforcement elements (such as metal meshes or high-strength fibers) to create composite structures that provide both high porosity for tissue integration and sufficient mechanical strength for load-bearing applications
4Reliability
If fiber diameter is reduced to enhance tissue integration, then biocompatibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical fiber drawing and spinning methods with electrospinning technology, which uses electric fields to draw and deposit ultra-fine fibers. This substitution enables precise control of fiber diameters in the sub-micron range while maintaining manufacturing feasibility, directly addressing the contradiction between fine fiber dimensions and manufacturing precision
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
This approach results in improved biocompatibility, enhanced tissue integration, and increased mechanical strength in medical appliances, reducing the risk of migration and leakage while maintaining structural integrity.
Implementation Method 1
electrospinning
Implementation Method 2
rotational spinning
Implementation Method 3
processed by heating and stretching
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3D
AI summary
Fibrous materials and methods of manufacturing fibrous materials are disclosed. In particular, this application discloses methods of making and processing serially deposited fibrous structures, such as serially deposited fibrous mats. Serially deposited fibrous mats may be used in implantable medical devices with various characteristics and features. Serially deposited fibrous mats of various mat thickness, fiber size, porosity, pore size, and fiber density are disclosed. Additionally, serially deposited fibrous mats having various amounts of fiber structures (such as intersections, branches, and bundles) per unit area are also disclosed.