scholarly journals Multinozzle Multichannel Temperature Deposition System for Construction of a Blood Vessel

2017 ◽  
Vol 23 (1) ◽  
pp. 64-69 ◽  
Author(s):  
Huanbao Liu ◽  
Huixing Zhou ◽  
Haiming Lan ◽  
Fu Liu ◽  
Xuhan Wang
Keyword(s):  
Tissue Engineering ◽  
Blood Vessel ◽  
3D Model ◽  
Model Structure ◽  
3D Bioprinting ◽  
Porous Structures ◽  
Bioactive Materials ◽  
Organ Regeneration ◽  
Hierarchical Porous ◽  
Temperature Deposition

3D bioprinting is an emerging technology that drives us to construct the complicated tissues and organs consisting of various materials and cells, which has been in widespread use in tissue engineering and organ regeneration. However, the protection and accurate distribution of cells are the most urgent problems to achieve tissue and organ reconstruction. In this article, a multinozzle multichannel temperature deposition and manufacturing (MTDM) system is proposed to fabricate a blood vessel with heterogeneous materials and gradient hierarchical porous structures, which enables not only the reconstruction of a blood vessel with an accurate 3D model structure but also the capacity to distribute bioactive materials such as growth factors, nutrient substance, and so on. In addition, a coaxial focusing nozzle is proposed and designed to extrude the biomaterial and encapsulation material, which can protect the cell from damage. In the MTDM system, the tubular structure of a blood vessel was successfully fabricated with the different biomaterials, which proved that the MTDM system has a potential application prospect in tissue engineering and organ regeneration.

scholarly journals Applying macromolecular crowding to 3D bioprinting: fabrication of 3D hierarchical porous collagen-based hydrogel constructs

2018 ◽  
Vol 6 (3) ◽  
pp. 562-574 ◽  
Author(s):  
Wei Long Ng ◽  
Min Hao Goh ◽  
Wai Yee Yeong ◽  
May Win Naing
Keyword(s):  
Tissue Engineering ◽  
Macromolecular Crowding ◽  
3D Bioprinting ◽  
Porous Structures ◽  
Hierarchical Porous

3D bioprinting of hierarchical porous structures for tissue engineering.

scholarly journals Three-dimensional printing of cell-laden bioink for blood vessel tissue engineering: Influence of process parameters and components on cell viability

2021 ◽  
Author(s):  
CONGCONG ZHAN ◽  
Yasong Hu ◽  
ANDUO ZHOU ◽  
SHANFENG ZHANG ◽  
Xia Huang
Keyword(s):  
Tissue Engineering ◽  
Blood Vessel ◽  
Cell Viability ◽  
Process Parameters ◽  
Umbilical Vein ◽  
Three Dimensional ◽  
Small Diameter ◽  
3D Bioprinting ◽  
Influence Of Process Parameters ◽  
Composite Gels

Three-dimensional (3D) bioprinting is a potential therapeutic method for tissue engineering owing to its ability to prepare cell-laden tissue constructs. The properties of bioink are crucial to accurately control the printing structure. Meanwhile, the effect of process parameters on the precise structure is not nonsignificant. We investigated the correlation between process parameters of 3D bioprinting and the structural response of κ-carrageenan-based hydrogels to explore the controllable structure, printing resolution, and cell survival rate. Small-diameter (<6 mm) gel filaments with different structures were printed by varying the shear stress of the extrusion bioprinter to simulate the natural blood vessel structure. The cell viability of the scaffold was evaluated. The in vitro culture of human umbilical vein endothelium cells (HUVECs) on the κ-carrageenan (kc) and composite gels (carrageenan/carbon nanotube and carrageenan/sodium alginate) demonstrated that the cell attachment and proliferation on composite gels were better than those on pure kc. Our results revealed that the carrageenan-based composite bioinks offer better printability, sufficient mechanical stiffness, interconnectivity, and biocompatibility. This process can facilitate precise adjustment of the pore size, porosity, and pore distribution of the hydrogel structure by optimising the printing parameters as well as realise the precise preparation of the internal structure of the 3D hydrogel-based tissue engineering scaffold. Moreover, we obtained perfused tubular filament by 3D printing at optimal process parameters.

Resolution of 3D bioprinting inside bulk gel and granular gel baths

Soft Matter ◽  
2021 ◽  
Author(s):  
Zheng-Tian Xie ◽  
Dong-Hee Kang ◽  
Michiya Matsusaki
Keyword(s):  
Tissue Engineering ◽  
Three Dimensional ◽  
Cutting Edge ◽  
3D Bioprinting ◽  
Organ Regeneration

Three-dimensional (3D) bioprinting has rapidly developed in the last decade, playing an increasingly important role in applications including pharmacokinetics research, tissue engineering, and organ regeneration. As a cutting-edge technology in...

scholarly journals 3D-Bioprinting Strategies Based on In Situ Bone-Healing Mechanism for Vascularized Bone Tissue Engineering

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 287
Author(s):  
Ye Lin Park ◽  
Kiwon Park ◽  
Jae Min Cha
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Bone Healing ◽  
Critical Size ◽  
Current Knowledge ◽  
3D Bioprinting ◽  
The Past ◽  
Regeneration Processes

Over the past decades, a number of bone tissue engineering (BTE) approaches have been developed to address substantial challenges in the management of critical size bone defects. Although the majority of BTE strategies developed in the laboratory have been limited due to lack of clinical relevance in translation, primary prerequisites for the construction of vascularized functional bone grafts have gained confidence owing to the accumulated knowledge of the osteogenic, osteoinductive, and osteoconductive properties of mesenchymal stem cells and bone-relevant biomaterials that reflect bone-healing mechanisms. In this review, we summarize the current knowledge of bone-healing mechanisms focusing on the details that should be embodied in the development of vascularized BTE, and discuss promising strategies based on 3D-bioprinting technologies that efficiently coalesce the abovementioned main features in bone-healing systems, which comprehensively interact during the bone regeneration processes.

scholarly journals GAKTpore: Stereological Characterisation Methods for Porous Foams in Biomedical Applications

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1269
Author(s):  
Gareth Sheppard ◽  
Karl Tassenberg ◽  
Bogdan Nenchev ◽  
Joel Strickland ◽  
Ramy Mesalam ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Biomedical Applications ◽  
Large Scale ◽  
Collagen Scaffold ◽  
Porous Structures ◽  
Tissue Engineering Scaffolds ◽  
Biological Responses ◽  
Sem Micrograph ◽  
Cell Adhesion And Proliferation ◽  
Characterisation Methods

In tissue engineering, scaffolds are a key component that possess a highly elaborate pore structure. Careful characterisation of such porous structures enables the prediction of a variety of large-scale biological responses. In this work, a rapid, efficient, and accurate methodology for 2D bulk porous structure analysis is proposed. The algorithm, “GAKTpore”, creates a morphology map allowing quantification and visualisation of spatial feature variation. The software achieves 99.6% and 99.1% mean accuracy for pore diameter and shape factor identification, respectively. There are two main algorithm novelties within this work: (1) feature-dependant homogeneity map; (2) a new waviness function providing insights into the convexity/concavity of pores, important for understanding the influence on cell adhesion and proliferation. The algorithm is applied to foam structures, providing a full characterisation of a 10 mm diameter SEM micrograph (14,784 × 14,915 px) with 190,249 pores in ~9 min and has elucidated new insights into collagen scaffold formation by relating microstructural formation to the bulk formation environment. This novel porosity characterisation algorithm demonstrates its versatility, where accuracy, repeatability, and time are paramount. Thus, GAKTpore offers enormous potential to optimise and enhance scaffolds within tissue engineering.

3D bioprinting for lung and tracheal tissue engineering: Criteria, advances, challenges, and future directions

Bioprinting ◽  
2021 ◽  
Vol 21 ◽  
pp. e00124
Author(s):  
Seyed Hossein Mahfouzi ◽  
Seyed Hamid Safiabadi Tali ◽  
Ghassem Amoabediny
Keyword(s):  
Tissue Engineering ◽  
3D Bioprinting ◽  
Future Directions ◽  
Tracheal Tissue

Design of aerogels, cryogels and xerogels of cellulose with hierarchical porous structures

2016 ◽  
Vol 92 ◽  
pp. 345-355 ◽  
Author(s):  
Kathirvel Ganesan ◽  
Anne Dennstedt ◽  
Adam Barowski ◽  
Lorenz Ratke
Keyword(s):  
Porous Structures ◽  
Hierarchical Porous

scholarly journals Vascularization Strategies in Bone Tissue Engineering

Cells ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1749
Author(s):  
Filip Simunovic ◽  
Günter Finkenzeller
Keyword(s):  
Tissue Engineering ◽  
Blood Vessel ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Critical Size ◽  
Ex Vivo ◽  
Angiogenic Growth Factors ◽  
Hypoxic Conditions ◽  
Surgical Methods ◽  
Artificial Tissue

Bone is a highly vascularized tissue, and its development, maturation, remodeling, and regeneration are dependent on a tight regulation of blood vessel supply. This condition also has to be taken into consideration in the context of the development of artificial tissue substitutes. In classic tissue engineering, bone-forming cells such as primary osteoblasts or mesenchymal stem cells are introduced into suitable scaffolds and implanted in order to treat critical-size bone defects. However, such tissue substitutes are initially avascular. Because of the occurrence of hypoxic conditions, especially in larger tissue substitutes, this leads to the death of the implanted cells. Therefore, it is necessary to devise vascularization strategies aiming at fast and efficient vascularization of implanted artificial tissues. In this review article, we present and discuss the current vascularization strategies in bone tissue engineering. These are based on the use of angiogenic growth factors, the co-implantation of blood vessel forming cells, the ex vivo microfabrication of blood vessels by means of bioprinting, and surgical methods for creating surgically transferable composite tissues.

Key advances of carboxymethyl cellulose in tissue engineering & 3D bioprinting applications

2021 ◽  
Vol 256 ◽  
pp. 117561
Author(s):  
Allen Zennifer ◽  
Praseetha Senthilvelan ◽  
Swaminathan Sethuraman ◽  
Dhakshinamoorthy Sundaramurthi
Keyword(s):  
Tissue Engineering ◽  
Carboxymethyl Cellulose ◽  
3D Bioprinting
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