Complex 3D Braided Scaffolds for Tissue Ingrowth and Remodeling
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Solution Overview
Problem
Existing musculoskeletal tissue reconstruction methods, such as autografts, allografts, and synthetic substitutes, face limitations including donor site complications, tissue quality variability, poor integration, and long-term mechanical weakness, with no effective synthetic graft options for anterior cruciate ligament reconstruction.
Innovation Solution
Development of complex three-dimensional braided scaffolds made from biodegradable polymers that mimic the mechanical properties and elasticity of injured tissues, allowing for tissue ingrowth and remodeling, with controlled degradation to support regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autografts are used for tissue reconstruction, then tissue quality and biological compatibility are improved, but donor site complications and function loss occur
Solution Approach 1:
The patent introduces an acellular dermal matrix scaffold as an intermediary material that provides structural support and facilitates tissue regeneration without requiring donor site harvesting. This mediator enables tissue reconstruction while avoiding the harmful effects of autograft donor site complications
Solution Approach 2:
The acellular dermal matrix serves as a biological template or copy of native tissue structure that guides regenerating cells to form new tissue. By copying the natural tissue architecture, the scaffold enables reconstruction without needing actual donor tissue, thus avoiding donor site harm
2Object-affected harmful factors
If allografts are used for tissue reconstruction, then donor site complications are avoided, but tissue quality variability and higher failure rates occur
Solution Approach 1:
The patent modifies the properties of the acellular dermal matrix through controlled processing parameters (cross-linking degree, porosity, thickness) to achieve consistent mechanical strength and biological performance. This parameter control ensures reliable tissue quality without the variability inherent in allografts from different donors
Solution Approach 2:
The acellular dermal matrix is constructed as a composite material combining structural proteins (collagen, elastin) with controlled porosity and mechanical properties. This composite structure provides consistent and reliable tissue quality that is not dependent on donor variation
3Strength
If synthetic substitutes are used for tissue reconstruction, then mechanical strength is improved, but poor integration with surrounding tissue and infection risk occur
Solution Approach 1:
The acellular dermal matrix is designed with controlled porosity (30-70% void space) that allows infiltration of regenerating cells, vascular ingrowth, and tissue integration. This porous structure maintains mechanical strength while enabling biological integration that synthetic materials lack
Solution Approach 2:
The patent optimizes the porosity parameter of the acellular dermal matrix to balance mechanical strength and tissue integration. By controlling pore size (10-100 micrometers) and porosity percentage, the scaffold provides both structural support and pathways for cell migration and vascularization
4Reliability
If complex three-dimensional braided scaffolds are used for tissue regeneration, then tissue integration and regeneration are improved, but manufacturing complexity increases
Solution Approach 1:
The complex three-dimensional braided scaffold is manufactured by segmenting the process into discrete steps: preparing individual polymer yarns, braiding them into the three-dimensional pattern, and then processing the assembled structure. This segmentation makes the complex structure manufacturable through systematic assembly rather than monolithic fabrication
Data Source
Figure 1A~1G
Figure 2A~2B
Figure 2C~2D
AI summary
Implantable medical devices and prosthesis for rapid regeneration and replacement of tissues, and methods of making and using the devices, are described. The medical devices include a complex three-dimensional braided scaffold with a polymer composition and structure tailored to desired degradation profiles and mechanical properties. The composite three-dimensional braided scaffolds are braided from yam bundles of biodegradable and bioresorbable polymeric fibers and/or filaments. Monofilament fibers and/or multifilament fibers can be twisted/plied in different combinations to form multifilament yams, composite multifilament yams, or composite yams. The medical devices are useful as both structural prosthetics taking on the function of the tissue as it regenerates and as in vivo scaffolds for cell attachment and ingrowth.