Vascularized Bioink Composition for Immediate Tissue Perfusion
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Solution Overview
Problem
Current methods for generating 3D engineered tissue constructs face challenges in vascularization, leading to delayed blood supply and limited survival of clinically relevant tissue sizes due to insufficient vascular networks, which hinder the development of functional bioengineered organs.
Innovation Solution
A bioink composition comprising silk methacrylate, heparin methacrylate, and gelatin methacrylate, along with photoinitiators and UV absorbers, is used to bioprint transplantable vascularized tissue constructs that allow for direct surgical anastomosis with host vasculature, ensuring immediate blood perfusion and long-term survival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cells are seeded onto 3D scaffolds to generate bioengineered tissue constructs, then tissue structure and function can be restored, but long-term tissue survival and normal function in vivo fail due to delayed vascularization and insufficient blood supply
Solution Approach 1:
The patent applies preliminary action by pre-forming vascular channels within the scaffold structure before tissue implantation. The scaffold is designed with integrated vascular networks that are prepared in advance, allowing immediate blood flow upon implantation rather than waiting for spontaneous vascularization. This pre-established vascular infrastructure ensures timely blood supply to support long-term tissue survival.
Solution Approach 2:
The patent applies segmentation by dividing the scaffold into functional zones with distinct vascular architectures. The vascular network is segmented into hierarchical levels (inlet vessels, branching vessels, capillary-like structures) that can be independently optimized and assembled. This modular vascular design allows for systematic integration of blood supply pathways throughout the tissue construct.
2Reliability
If the scaffold porosity and channeling are adjusted to promote vascularization, then blood supply improves, but the vascular organization and connectivity with host vasculature remain slow and non-biomimetic, resulting in disorganized, unstable, leaky, and hemorrhagic vessels
Solution Approach 1:
The patent applies parameter changes by systematically optimizing scaffold porosity, pore size distribution, and channel geometry to match physiological vascular parameters. The scaffold incorporates controlled porosity gradients and specific pore size ranges (e.g., 100-500 μm) that promote organized vascular infiltration while maintaining structural integrity. These parameter optimizations enable formation of stable, non-leaky vessels that properly connect to host vasculature.
Solution Approach 2:
The patent applies local quality by creating spatially varying properties within the scaffold to guide vascular organization. Different regions of the scaffold have tailored porosity, stiffness, and surface characteristics that direct endothelial cell behavior and vascular network formation. This localized optimization ensures appropriate vascular architecture in different tissue zones while maintaining overall network stability and connectivity.
3Length of stationary object
If cells are placed within 100-200 μm of an oxygen and nutrient source for survival, then cell viability is maintained, but the construct size is limited to small, thin, or porous structures that cannot form thick, solid organs
Solution Approach 1:
The patent applies dimensionality change by transitioning from 2D surface vascularization to 3D integrated vascular networks. The scaffold incorporates three-dimensional vascular channels that extend throughout the tissue volume, allowing blood supply to reach cells deep within thick constructs. This 3D vascular architecture enables formation of solid, thick organs by providing oxygen and nutrients along multiple spatial dimensions rather than relying on surface diffusion alone.
Solution Approach 2:
The patent applies the nested doll principle by embedding vascular channels within the scaffold matrix in a hierarchical arrangement. Smaller capillary-like structures are nested within larger vascular channels, which are themselves nested within the overall scaffold architecture. This nested vascular design ensures that cells at any depth within the thick construct remain within adequate diffusion distance of a blood vessel, enabling formation of solid organs several millimeters thick.
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 method enables the production of clinically applicable regenerative medicine products with viable and functional tissue constructs that can be directly connected to the patient's vascular system, overcoming the limitations of existing techniques in vascularization and ensuring immediate blood perfusion and long-term tissue survival.
Implementation Method 1
at least one UV absorber; and at least one photoinitiator
Implementation Method 2
at least one UV absorber
Data Source
AI summary
Compositions and methods for bioprinting a transplantable vascularized tissue construct that allows for direct surgical anastomosis to a host, to achieve immediate blood perfusion with host vasculature for long-term cell survival and function.