Composite Tissue Construct with Vascularized Layer for Cell Alignment
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Solution Overview
Problem
Current tissue engineering methods face challenges such as low cell density, low cell survival rates, and limited nutrient and waste transport due to thick scaffolds and lack of cellular orientation in anisotropic tissues like muscle tissues.
Innovation Solution
A composite tissue construct with a biodegradable substrate and a vascularized layer comprising blood vessels is developed, allowing cell growth and facilitating nutrient and waste transport, while the substrate is patterned to guide cell alignment using microchannels created by femtosecond laser or fibre-spinning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thick scaffold is used to achieve high cell density, then cell density is improved, but nutrient and waste transport becomes limited
Solution Approach 1:
The scaffold is divided into multiple thin layers instead of using a single thick scaffold. Each layer is thin enough to allow efficient nutrient and waste transport while collectively providing sufficient capacity for high cell density. The layered structure segments the transport path into shorter segments that can be effectively serviced by the vascular network.
Solution Approach 2:
The invention transitions from a single-dimensional thick scaffold to a multi-dimensional layered structure. By stacking multiple thin layers with vascularized connective tissue in between, the system creates additional transport dimensions through which nutrients and waste can move, effectively solving the transport limitation while maintaining high cell density capacity.
2Quantity of substance
If a thick scaffold is used to achieve high cell density, then cell density is improved, but cellular orientation in anisotropic tissues deteriorates
Solution Approach 1:
The scaffold is segmented into multiple thin layers, each capable of providing appropriate cellular orientation cues. The thin layer structure allows for better control over cell alignment within each layer, and the overall stacked structure maintains the anisotropic properties needed for tissues like muscle while achieving high cell density.
Solution Approach 2:
The invention uses a composite structure combining multiple scaffold layers with vascularized connective tissue layers. This composite approach allows each scaffold layer to be optimized for cellular orientation while the overall structure provides sufficient volume for high cell density, resolving the contradiction between orientation precision and cell density.
3Productivity
If cell therapy is used to repair damaged tissue, then tissue repair is achieved, but cell survival rate deteriorates
Solution Approach 1:
The scaffold is pre-vascularized with connective tissue and blood vessels before cell implantation. This preliminary action ensures that the vascular network is already in place to support cell survival, eliminating the need for cells to survive without adequate blood supply during the critical early period after implantation.
Solution Approach 2:
The vascularized connective tissue acts as an intermediary between the implanted cells and the host's circulatory system. This intermediary layer provides immediate nutrient supply and waste removal capabilities, significantly improving cell survival rates while enabling effective tissue repair.
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 composite tissue construct achieves high cell density and anisotropic properties, promoting faster and more effective tissue repair by enhancing cell alignment and nutrient transport, thereby improving cell survival and tissue regeneration.
Implementation Method 1
microchannels created by femtosecond laser
Implementation Method 2
a vascularized layer comprising a plurality of blood vessels therein, allowing cell growth and facilitating nutrient and waste transport
Implementation Method 3
providing a biodegradable substrate
Data Source
AI summary
The present invention relates to a method for forming a tissue construct having a composite structure. The method includes providing a biodegradable substrate, wherein the substrate is adapted to allow deposition or growth of a plurality of cells; providing a vascularized layer comprising a plurality of blood vessels therein; and adhering the vascularized layer to the substrate.