Composite Soft Tissue Scaffold With Porous Core and Tension Support
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Solution Overview
Problem
Current scaffolds for soft tissue repair and reconstruction lack optimal porosity, surface area, and mechanical properties necessary for effective cellular ingrowth and tissue regeneration, often causing inflammation and incomplete healing due to inadequate void volume and mechanical load sharing.
Innovation Solution
A composite scaffold with a porous structure and hydrogel, providing mechanical reinforcement and a large surface area for cellular proliferation, featuring interconnected void spaces that resist collapse under tension, and is bioabsorbable to support healing and tissue regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mesh-like scaffolds are used to provide mechanical support, then mechanical strength is improved, but porosity and void volume are insufficient for tissue regeneration
Solution Approach 1:
The scaffold is divided into two distinct functional layers: a mesh-like support structure providing mechanical strength and a porous material filling the voids to enable tissue regeneration. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The invention combines two different materials with complementary properties: a mesh-like scaffold material for mechanical support and a porous biologic or synthetic material for tissue regeneration. This composite structure resolves the contradiction by integrating both mechanical strength and adequate void volume in a single device.
2Strength
If permanent synthetic polymers are used in scaffolds, then mechanical properties are improved, but inflammation and adverse reactions occur
Solution Approach 1:
The invention changes the material parameter from permanent synthetic polymers to bioabsorbable materials that maintain mechanical properties during the healing period and then gradually degrade. This parameter change reduces long-term inflammation while preserving necessary mechanical support during tissue regeneration.
Solution Approach 2:
The scaffold is designed to be temporarily present to provide mechanical support and then gradually degraded and absorbed by the body as tissue regeneration completes. This temporary presence followed by discarding eliminates long-term foreign body response while maintaining mechanical properties when needed.
3Volume of stationary object
If biologic scaffolds are highly processed to improve porosity, then tissue ingrowth is improved, but mechanical strength and resistance to collapse are reduced
Solution Approach 1:
The scaffold separates the mechanical support function (mesh-like structure) from the tissue regeneration function (porous material). The mesh layer maintains structural integrity and resistance to collapse, while the porous material filling the mesh voids provides high porosity for tissue ingrowth without bearing mechanical loads.
4Volume of stationary object
If fiber spacing is increased to improve void volume, then tissue regeneration space is improved, but surface area for cell ingrowth is reduced
Solution Approach 1:
The invention transitions from a one-dimensional fiber spacing problem to a three-dimensional solution by filling the mesh voids with porous material. This creates multiple levels of surface area: the mesh provides external surface area while the porous filling material provides internal surface area, simultaneously achieving adequate void volume and extensive surface area for cell ingrowth.
Data Source
AI summary
A composite scaffold having a highly porous interior with increased surface area and void volume is surrounded by a flexible support structure that substantially maintains its three-dimensional shape under tension and provides mechanical reinforcement during repair or reconstruction of soft tissue while simultaneously facilitating regeneration of functional tissue.