3D Scaffold with Layered Polymer-Hydrogel Structure
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Solution Overview
Problem
Conventional three-dimensional scaffolds for tissue engineering face limitations in adjusting pore size, position, and porosity, which affect cell deposition, proliferation, and mechanical strength, leading to inadequate tissue regeneration support.
Innovation Solution
A scaffold is formed by alternately stacking biodegradable synthetic polymer-hydrogel layers, where the hydrogel is interposed between polymer lines, using materials like PLA, PGA, and PLGA for the polymer and collagen, gelatin, or hyaluronic acid as hydrogel, with growth factors and cells integrated to enhance cell deposition and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porosity is increased to enhance connection between pores, then cell deposition and proliferation are improved, but mechanical strength is lowered
Solution Approach 1:
The patent uses a composite structure combining biodegradable polymer (providing mechanical strength) and hydrogel (providing porosity and cell compatibility). This composite approach allows simultaneous achievement of high mechanical strength and high porosity, resolving the contradiction between these two properties.
Solution Approach 2:
The scaffold is divided into multiple layers with alternating polymer and hydrogel components. This segmentation allows each material to fulfill its specific function: polymer layers provide structural integrity while hydrogel layers provide porous pathways for cell infiltration, achieving both strength and porosity without compromise.
2Ease of manufacture
If conventional gas foaming or salt leaching methods are used, then scaffold fabrication is achieved, but adjustment of pore size, position and porosity is limited
Solution Approach 1:
The patent employs parameter changes in the fabrication process, specifically controlling the injection parameters of polymer and hydrogel materials to precisely control pore size, position, and porosity. This allows flexible adjustment of scaffold characteristics without compromising manufacturability.
Solution Approach 2:
The hydrogel acts as an intermediary material that is injected between polymer layers to create controlled porous structures. This intermediary approach enables precise control over pore formation and positioning while maintaining ease of manufacture through a straightforward layer-by-layer fabrication process.
3Strength
If biodegradable polymer only is used, then mechanical strength is maintained, but cell recognition of three-dimensional environment and deposition are insufficient
Solution Approach 1:
The patent combines biodegradable polymer with hydrogel to create a composite scaffold where the polymer provides mechanical strength and the hydrogel provides a three-dimensional environment for cell recognition and deposition. This composite structure resolves the contradiction between strength and cell compatibility.
Solution Approach 2:
Different regions of the scaffold have different material compositions: polymer-rich regions provide structural support while hydrogel-rich regions provide cell-friendly environments. This local quality variation allows the scaffold to simultaneously achieve mechanical strength and promote cell deposition and proliferation.
Data Source
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AI summary
A scaffold having a reinforced tissue regeneration ability and a method of manufacturing the same are provided. The scaffold is formed in a lattice form by alternately stacking biodegradable synthetic polymer-hydrogel layers. In this case, the biodegradable synthetic polymer-hydrogel layer is formed by disposing a plurality of biodegradable synthetic polymer-hydrogel units including a biodegradable synthetic polymer and a hydrogel at a predetermined gap.