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https://www.readbyqxmd.com/read/28149624/an-engineering-perspective-on-3d-printed-personalized-scaffolds-for-tracheal-suspension-technique
#1
COMMENT
Jia An, Chee Kai Chua
3D printing is a large family of many distinct technologies covering a wide range of topics. From an engineering point of view, there should be considerations for selection of design, material, and process when using 3D printing for surgical technique innovation such as personalized scaffolds. Moreover, cost should also be considered if there are equally effective alternatives to the innovation. Furthermore, engineering considerations and options should be clearly communicated and readily available to surgeons for advancement in future...
December 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28131109/fabrication-of-chitosan-silk-based-tracheal-scaffold-using-freeze-casting-method
#2
Zeinab Nematollahi, Mohammad Tafazzoli-Shadpour, Ali Zamanian, Amir Seyedsalehi, Shadmehr Mohammad-Behgam, Fariba Ghorbani, Fereshte Mirahmadi
Background: Since the treatments of long tracheal leisions are associated with some limitations, tissue enginered trachea is considered as an alternative option. This study aimed at preparing a composite scaffold, based on natural and synthetic materials for tracheal tissue engineering. Methods: Nine chitosan silk-based scaffolds were fabricated using three freezing rates (0.5, 1, and 2°C/min) and glutaraldehyde (GA) concentrations (0, 0.4, and 0.8 wt%). Samples were characterized, and scaffolds having mechanical properties compatible with those of human trachea and proper biodegradability were selected for chondrocyte cell seeding and subsequent biological assessments...
29, 2017: Iranian Biomedical Journal
https://www.readbyqxmd.com/read/28101973/heparin-cross-linked-collagen-sponge-scaffolds-improve-functional-regeneration-of-rat-tracheal-epithelium
#3
Ryosuke Nakamura, Akiko Tani, Susumu Yoshie, Masakazu Ikeda, Ikuo Wada, Akihiro Hazama, Yukio Nomoto, Yasuhiro Tada, Tatsuo Nakamura, Koichi Omori
Tracheal epithelial cells maintain airway homeostasis by mediating mucociliary clearance. Following tracheal reconstruction, timely epithelial regeneration is required to prevent respiratory compromise and infectious diseases. To achieve rapid tracheal epithelial regeneration, a heparin cross-linked collagen sponge containing fibroblast growth factor-2 (FGF-2) was prepared as a graft for tracheal reconstruction. The heparin cross-linked sponge exhibited a high FGF-2 retaining capacity, and tracheal epithelial and mesenchymal cells cultured in this sponge containing FGF-2 showed high proliferative capacities...
January 19, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28066613/tracheal-suspension-by-using-3-dimensional-printed-personalized-scaffold-in-a-patient-with-tracheomalacia
#4
Lijun Huang, Lei Wang, Jiankang He, Jinbo Zhao, Daixing Zhong, Guanying Yang, Ting Guo, Xiaolong Yan, Lixiang Zhang, Dichen Li, Tiesheng Cao, Xiaofei Li
The major methods are used to fix or stabilize the central airways and major bronchi with either anterior suspension and/or posterior fixation for severe tracheomalacia (TM). Many support biomaterials, like mesh and sternal plate, can be used in the surgery. But there are no specialized biomaterials for TM which must be casually fabricated by the doctors in operation. Three dimensional printing (3DP) has currently untapped potential to provide custom, protean devices for challenging and life-threatening disease processes...
November 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28038750/a-tracheal-scaffold-of-gelatin-chondroitin-sulfate-hyaluronan-polyvinyl-alcohol-with-orientated-porous-structure
#5
Xueping Yu, Guowen Qian, Si Chen, Dong Xu, Xiujuan Zhao, Chang Du
Scaffold of gelatin-chondroitin sulfate-hyaluronan-polyvinyl alcohol (GCH-PVA) with orientated microtubule structure and good hydrophilicity was fabricated by unidirectional freeze-drying method mimicking the composition and structure of tracheal cartilage extracellular matrix. PVA was incorporated to improve flexibility and viscoelasticity of GCH scaffold. All wet scaffolds showed similar compressive elastic modulus with native cartilage. GCH-PVA scaffolds showed high relative remaining stress during relaxation indicating good mechanical stability...
March 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27925229/plga-ptmc-cultured-bone-mesenchymal-stem-cell-scaffold-enhances-cartilage-regeneration-in-tissue-engineered-tracheal-transplantation
#6
Bingyang Yan, Zhipei Zhang, Xiaoping Wang, Yunfeng Ni, Yongshi Liu, Tao Liu, Wuping Wang, Hao Xing, Ying Sun, Jian Wang, Xiao-Fei Li
The treatment of long-segment tracheal defect requires the transplantation of effective tracheal substitute, and the tissue-engineered trachea (TET) has been proposed as an ideal tracheal substitute. The major cause of the failure of segmental tracheal defect reconstruction by TET is airway collapse caused by the chondromalacia of TET cartilage. The key to maintain the TET structure is the regeneration of chondrocytes in cartilage, which can secrete plenty of cartilage matrices. To address the problem of the chondromalacia of TET cartilage, this study proposed an improved strategy...
December 7, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27863642/tissue-engineered-trachea-a-review
#7
REVIEW
Jia Xian Law, Ling Ling Liau, Bin Saim Aminuddin, Bt Hj Idrus Ruszymah
Tracheal replacement is performed after resection of a portion of the trachea that was impossible to reconnect via direct anastomosis. A tissue-engineered trachea is one of the available options that offer many advantages compared to other types of graft. Fabrication of a functional tissue-engineered trachea for grafting is very challenging, as it is a complex organ with important components, including cartilage, epithelium and vasculature. A number of studies have been reported on the preparation of a graftable trachea...
December 2016: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/27859361/an-in-vitro-scaffold-free-epithelial-fibroblast-coculture-model-for-the-larynx
#8
Tanaya Walimbe, Alyssa Panitch, M Preeti Sivasankar
OBJECTIVES/HYPOTHESIS: Physiologically relevant, well-characterized in vitro vocal fold coculture models are needed to test the effects of various challenges and therapeutics on vocal fold physiology. We characterize a healthy state coculture model, created by using bronchial/tracheal epithelial cells and immortalized vocal fold fibroblasts. We also demonstrate that this model can be induced into a fibroplastic state to overexpress stress fibers using TGFβ1. STUDY DESIGN: In vitro...
November 16, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27788126/3d-printed-polyurethane-prosthesis-for-partial-tracheal-reconstruction-a-pilot-animal-study
#9
Soo Yeon Jung, Sang Jin Lee, Ha Yeong Kim, Hae Sang Park, Zhan Wang, Hyun Jun Kim, James J Yoo, Sung Min Chung, Han Su Kim
A ready-made, acellular patch-type prosthesis is desirable in repairing partial tracheal defects in the clinical setting. However, many of these prostheses may not show proper biological integration and biomechanical function when they are transplanted. In this study, we developed a novel 3D printed polyurethane (PU) tracheal scaffold with micro-scale architecture to allow host tissue infiltration and adequate biomechanical properties to withstand physiological tracheal condition. A half-pipe shaped PU scaffold (1...
October 27, 2016: Biofabrication
https://www.readbyqxmd.com/read/27770937/evaluation-of-the-potential-of-rhtgf-%C3%AE-3-encapsulated-p-lla-cl-collagen-nanofibers-for-tracheal-cartilage-regeneration-using-mesenchymal-stems-cells-derived-from-wharton-s-jelly-of-human-umbilical-cord
#10
Jing Wang, Binbin Sun, Lingling Tian, Xiaomin He, Qiang Gao, Tong Wu, Seeram Ramakrishna, Jinghao Zheng, Xiumei Mo
Tracheal injuries are one of major challenging issues in clinical medicine because of the poor intrinsic ability of tracheal cartilage for repair. Tissue engineering provides an alternative method for the treatment of tracheal defects by generating replacement tracheal structures. In this study, core-shell nanofibrous scaffold was fabricated to encapsulate bovine serum albumin & rhTGF-β3 (recombinant human transforming growth factor-β3) into the core of the nanofibers for tracheal cartilage regeneration. Characterization of the core-shell nanofibrous scaffold was carried out by scanning electron microscope (SEM), transmission electron microscope (TEM), laser scanning confocal microscopy (LSCM), and tensile mechanical test...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27712036/in-vitro-evaluation-of-poly-lactic-co-glycolic-acid-polyisoprene-fibers-for-soft-tissue-engineering
#11
Douglas R Marques, Luís A L Dos Santos, Marie A O'Brien, Sarah H Cartmell, Julie E Gough
The polymeric blend of poly (lactic-co-glycolic acid) (PLGA) and polyisoprene (PI) has recently been explored for application as stents for tracheal stenosis and spring for the treatment of craniosynostosis. From the positive results presented in other biomedical applications comes the possibility of investigating the application of this material as scaffold for tissue engineering (TE), acquiring a deeper knowledge about the polymeric blend by exploring a new processing technique while attending to the most fundamental demands of TE scaffolds...
October 6, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27696973/tracheal-tissue-engineering-in-vivo-biocompatibility-of-mechanically-stripped-allogenic-rabbit-trachea-with-autologous-epithelial-covering
#12
Margot Den Hondt, Bart M Vanaudenaerde, Erik K Verbeken, Jan J Vranckx
BACKGROUND: Successful trachea transplantation comprises the use of biocompatible constructs with little immune-reactivity, submucosal revascularization and creation of an epithelial covering. Allogenic chondrocytes might be protected from an overt immune-response due to physical isolation. Our aim was to evaluate in-vivo biocompatibility of allotracheae, stripped of their highly-immunogenic inner lining. Secondly, we established whether these constructs might serve as suitable scaffolds for autologous epithelial grafting...
October 4, 2016: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/27618230/viscoelastic-properties-of-human-tracheal-tissues
#13
Farzaneh Safshekan, Mohammad Tafazzoli-Shadpour, Majid Abdouss, Mohammad B Shadmehr
The physiological performance of trachea is highly dependent on its mechanical behavior, and therefore, the mechanical properties of its components. Mechanical characterization of trachea is key to succeed in new treatments such as tissue engineering, which requires the utilization of scaffolds which are mechanically compatible with the native human trachea. In this study, after isolating human trachea samples from brain-dead cases and proper storage, we assessed the viscoelastic properties of tracheal cartilage, smooth muscle and connective tissue, based on stress relaxation tests (at 5% and 10% strains for cartilage and 20%, 30% and 40% for smooth muscle and connective tissue)...
September 12, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27520928/engineered-tissue-stent-biocomposites-as-tracheal-replacements
#14
Liping Zhao, Sumati Sundaram, Andrew V Le, Angela H Huang, Jiasheng Zhang, Go Hatachi, Arkadi Beloiartsev, Michael G Caty, Tai Yi, Katherine Leiby, Ashley Gard, Mehmet H Kural, Liqiong Gui, Kevin A Rocco, Amogh Sivarapatna, Elizabeth Calle, Allison Greaney, Luca Urbani, Panagiotis Maghsoudlou, Alan Burns, Paolo DeCoppi, Laura E Niklason
Here we report the creation of a novel tracheal construct in the form of an engineered, acellular tissue-stent biocomposite trachea (TSBT). Allogeneic or xenogeneic smooth muscle cells are cultured on polyglycolic acid polymer-metal stent scaffold leading to the formation of a tissue comprising cells, their deposited collagenous matrix, and the stent material. Thorough decellularization then produces a final acellular tubular construct. Engineered TSBTs were tested as end-to-end tracheal replacements in 11 rats and 3 nonhuman primates...
September 2016: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27417155/characterization-of-a-biologically-derived-rabbit-tracheal-scaffold
#15
P Lange, H Shah, M Birchall, P Sibbons, T Ansari
There is a clinical need to provide replacement tracheal tissue for the pediatric population affected by congenital defects, as current surgical solutions are not universally applicable. A potential solution is to use tissue engineered scaffold as the framework for regenerating autologous tissue. Rabbit trachea were used and different detergents (Triton x-100 and sodium deoxycholate) and enzymes (DNAse/RNAse) investigated to create a decellularization protocol. Each reagent was initially tested individually and the outcome used to design a combined protocol...
July 15, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27106472/successful-treatment-of-a-recurrent-wide%C3%A2-tracheoesophageal-fistula-with-a%C3%A2-bioabsorbable-patch
#16
Lucia Battistella, Giuseppe Marulli, Giovanni Maria Comacchio, Marco Mammana, Guido Di Gregorio, Federico Rea
Acquired nonmalignant tracheoesophageal fistula (TEF) is a rare condition that requires proper treatment. We present the case of a 55-year-old woman with a 4.5-cm recurrent TEF, which had developed after an attempted surgical repair. After closure of the esophageal defect in two layers, a tracheoplasty technique was used to repair the tracheal membranous wall with a synthetic bioabsorbable patch (Gore Bio-A tissue reinforcement) covered with an intercostal muscle flap. The use of Gore Bio-A tissue reinforcement is an innovative and effective method to close a wide tracheal defect while achieving a scaffold for epithelial colonization...
May 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27097554/mechanical-evaluation-of-gradient-electrospun-scaffolds-with-3d-printed-ring-reinforcements-for-tracheal-defect-repair
#17
Lindsey M Ott, Taylor A Zabel, Natalie K Walker, Ashley L Farris, Jason T Chakroff, Devan G Ohst, Jed K Johnson, Steven H Gehrke, Robert A Weatherly, Michael S Detamore
Tracheal stenosis can become a fatal condition, and current treatments include augmentation of the airway with autologous tissue. A tissue-engineered approach would not require a donor source, while providing an implant that meets both surgeons' and patients' needs. A fibrous, polymeric scaffold organized in gradient bilayers of polycaprolactone (PCL) and poly-lactic-co-glycolic acid (PLGA) with 3D printed structural ring supports, inspired by the native trachea rings, could meet this need. The purpose of the current study was to characterize the tracheal scaffolds with mechanical testing models to determine the design most suitable for maintaining a patent airway...
April 21, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27080716/genipin-cross-linked-decellularized-tracheal-tubular-matrix-for-tracheal-tissue-engineering-applications
#18
Fei Sun, Yuan Jiang, Yanfei Xu, Hongcan Shi, Siquan Zhang, Xingchen Liu, Shu Pan, Gang Ye, Weidong Zhang, Fangbiao Zhang, Chonghao Zhong
Decellularization techniques have been widely used as an alternative strategy for organ reconstruction. This study investigated the mechanical, pro-angiogenic and in vivo biocompatibility properties of decellularized airway matrices cross-linked with genipin. New Zealand rabbit tracheae were decellularized and cross-linked with genipin, a naturally derived agent. The results demonstrated that, a significant (p < 0.05) increase in the secant modulus was computed for the cross-linked tracheae, compared to the decellularized samples...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27062124/in-vitro-characterization-of-design-and-compressive-properties-of-3d-biofabricated-decellularized-hybrid-grafts-for-tracheal-tissue-engineering
#19
Christopher Johnson, Priyanka Sheshadri, Jessica M Ketchum, Lokesh K Narayanan, Paul M Weinberger, Rohan A Shirwaiker
Infection or damage to the trachea, a thin walled and cartilage reinforced conduit that connects the pharynx and larynx to the lungs, leads to serious respiratory medical conditions which can often prove fatal. Current clinical strategies for complex tracheal reconstruction are of limited availability and efficacy, but tissue engineering and regenerative medicine approaches may provide viable alternatives. In this study, we have developed a new "hybrid graft" approach that utilizes decellularized tracheal tissue along with a resorbable polymer scaffold, and holds promise for potential clinical applications...
June 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/26949099/behavior-of-vascular-resistance-undergoing-various-pressure-insufflation-and-perfusion-on-decellularized-lungs
#20
Renata Kelly da Palma, Paula Naomi Nonaka, Noelia Campillo, Juan J Uriarte, Jessica Julioti Urbano, Daniel Navajas, Ramon Farré, Luis V F Oliveira
Bioengineering of functional lung tissue by using whole lung scaffolds has been proposed as a potential alternative for patients awaiting lung transplant. Previous studies have demonstrated that vascular resistance (Rv) could be altered to optimize the process of obtaining suitable lung scaffolds. Therefore, this work was aimed at determining how lung inflation (tracheal pressure) and perfusion (pulmonary arterial pressure) affect vascular resistance. This study was carried out using the lungs excised from 5 healthy male Sprague-Dawley rats...
3, 2016: Journal of Biomechanics
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