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https://www.readbyqxmd.com/read/28530209/reproducible-3d-printed-head-tanks-for-electrical-impedance-tomography-with-realistic-shape-and-conductivity-distribution
#1
James Avery, Kirill Aristovich, Barney Low, David Holder
OBJECTIVE: Electrical impedance tomography (EIT) has many promising applications in brain injury monitoring. To evaluate both instrumentation and reconstruction algorithms, experiments are first performed in head tanks. Existing methods, whilst accurate, produce a discontinuous conductivity, and are often made by hand, making it hard for other researchers to replicate. APPROACH: We have developed a method for constructing head tanks directly in a 3D printer. Conductivity was controlled through perforations in the skull surface, which allow for saline to pass through...
May 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28520846/patient-specific-augmentation-rhinoplasty-using-a-three-dimensional-simulation-program-and-three-dimensional-printing
#2
Yim Don Choi, Youngjun Kim, EunSoo Park
Background: The convergence of three-dimensional (3D) simulation, tissue engineering, and 3D printing technology is creating a paradigm shift in plastic surgery. In augmentation rhinoplasty, determining the ideal material and design method has been a critical issue for many years. Thus, these technologies are expected to make important contributions to augmentation rhinoplasty. Objectives: We sought to validate the feasibility of the 3D carving simulation and patient-specific implant fabrication system (3D carving system) in a clinical trial using reproducibility tests...
May 17, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28518077/inkjet-printed-polyvinyl-alcohol-multilayers
#3
Iulia Salaoru, Zuoxin Zhou, Peter Morris, Gregory J Gibbons
Inkjet printing is a modern method for polymer processing, and in this work, we demonstrate that this technology is capable of producing polyvinyl alcohol (PVOH) multilayer structures. A polyvinyl alcohol aqueous solution was formulated. The intrinsic properties of the ink, such as surface tension, viscosity, pH, and time stability, were investigated. The PVOH-based ink was a neutral solution (pH 6.7) with a surface tension of 39.3 mN/m and a viscosity of 7.5 cP. The ink displayed pseudoplastic (non-Newtonian shear thinning) behavior at low shear rates, and overall, it demonstrated good time stability...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28513626/fabrication-of-cerebral-aneurysm-simulator-with-a-desktop-3d-printer
#4
Yu Liu, Qing Gao, Song Du, ZiChen Chen, JianZhong Fu, Bing Chen, ZhenJie Liu, Yong He
Now, more and more patients are suffering cerebral aneurysm. However, long training time limits the rapid growth of cerebrovascular neurosurgeons. Here we developed a novel cerebral aneurysm simulator which can be better represented the dynamic bulging process of cerebral aneurysm The proposed simulator features the integration of a hollow elastic vascular model, a skull model and a brain model, which can be affordably fabricated at the clinic (Fab@Clinic), under $25.00 each with the help of a low-cost desktop 3D printer...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28508160/operative-simulation-of-anterior-clinoidectomy-using-a-rapid-prototyping-model-molded-by-a-three-dimensional-printer
#5
Shinichi Okonogi, Kosuke Kondo, Naoyuki Harada, Hiroyuki Masuda, Masaaki Nemoto, Nobuo Sugo
BACKGROUND: As the anatomical three-dimensional (3D) positional relationship around the anterior clinoid process (ACP) is complex, experience of many surgeries is necessary to understand anterior clinoidectomy (AC). We prepared a 3D synthetic image from computed tomographic angiography (CTA) and magnetic resonance imaging (MRI) data and a rapid prototyping (RP) model from the imaging data using a 3D printer. The objective of this study was to evaluate anatomical reproduction of the 3D synthetic image and intraosseous region after AC in the RP model...
May 15, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28507870/intraoperative-change-in-defect-size-during-maxillary-reconstruction-using-surgical-guides-created-by-cad-cam
#6
Daiki Morita, Toshiaki Numajiri, Hiroko Nakamura, Shoko Tsujiko, Yoshihiro Sowa, Makoto Yasuda, Shigeru Hirano
Surgical osteotomy guides created by computer-aided design/computer-aided manufacturing (CAD/CAM) have been developed and are now widely used in maxillofacial reconstruction. However, there are no standard procedures for dealing with an intraoperative change in defect size. We report on a case in which we used our CAD/CAM guides to deal with an intraoperative change in defect size in a maxillary reconstruction. We planned the maxillary reconstruction using a free fibula flap because of left maxillary sinus cancer in a 73-year-old man...
April 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28502686/customized-polymethylmethacrylate-cranioplasty-implants-using-3d-printed-polylactic-acid-molds-technical-note-with-2-illustrative-cases
#7
Joe Abdel Hay, Tarek Smayra, Ronald Moussa
OBJECTIVE: Prefabricated customized cranioplasty implants are anatomically more accurate than manually shaped acrylic implants but remain costly. The authors describe a new cost-effective technique of producing customized polymethylmethacrylate (PMMA) cranioplasty implants using prefabricated 3D printed molds. METHODS: The first patient had a left frontal cranial defect following a craniotomy for a glial tumor. A 3D image of his skull was obtained from axial 0.6mm computed tomography (CT) scan images...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28501270/a-novel-stereotactic-frame-for-real-pet-guided-biopsies-a-preclinical-proof-of-concept
#8
J Cortes-Rodicio, G Sanchez-Merino, M A Garcia-Fidalgo, I Tobalina-Larrea
PURPOSE: To design, build and test a stereotactic device that allows PET image-guided biopsies to be performed. METHODS: An initial prototype consisting of four main pieces, one of which contains radioactive markers to make it visible in the PET images, was built using a 3D printer. Once the device is mounted, a spherical coordinate system is built with the entrance needle point in the skin as the origin of coordinates. Two in-house software programs, namely getCoord...
May 10, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28500466/a-three-dimensional-pelvic-model-made-with-a-three-dimensional-printer-applications-for-laparoscopic-surgery-to-treat-rectal-cancer
#9
A Hamabe, M Ito
To help understand the three-dimensional (3D) spatial relationships among the highly complex structures of the pelvis, we made a novel 3D pelvic model with a 3D printing system. We created two pelvic models including the muscles, vessels, nerves, and urogenital organs; the first based on the pelvic anatomy of a healthy male volunteer and the second on the pelvic anatomy of a female volunteer with rectal cancer. The models clearly demonstrated the complicated spatial relationships between anatomical structures in the pelvis...
May 12, 2017: Techniques in Coloproctology
https://www.readbyqxmd.com/read/28499127/3d-printed-scaffolds-with-synergistic-effect-of-hollow-pipe-structure-and-bioactive-ions-for-vascularized-bone-regeneration
#10
Wenjie Zhang, Chun Feng, Guangzheng Yang, Guanglong Li, Xun Ding, Shaoyi Wang, Yuandong Dou, Zhiyuan Zhang, Jiang Chang, Chengtie Wu, Xinquan Jiang
Segmental bone regeneration remains a considerable challenge due to the associated low degree of vascularization. To solve this problem, in this study, hollow-pipe-packed silicate bioceramic (BRT-H) scaffolds are fabricated using a coaxial three-dimensional (3D) printing technique. Based on a modified core/shell printer nozzle and a modulated viscoelastic bioceramic paste, hollow struts with an external diameter of 1 mm and internal dimeter of 500 μm can be directly printed, yielding a compressive strength of the BRT-H scaffolds as high as 26 MPa...
May 3, 2017: Biomaterials
https://www.readbyqxmd.com/read/28475739/a-step-by-step-development-of-real-size-chest-model-for-simulation-of-thoracoscopic-surgery
#11
Toshiaki Morikawa, Makoto Yamashita, Makoto Odaka, Yo Tsukamoto, Takamasa Shibasaki, Shohei Mori, Hisatoshi Asano, Tadashi Akiba
OBJECTIVES: For the purpose of simulating thoracoscopic surgery, we have conducted stepwise development of a life-like chest model including thorax and intrathoracic organs. METHODS: First, CT data of the human chest were obtained. First-generation model: based on the CT data, each component of the chest was made from a 3D printer. A hard resin was used for the bony thorax and a rubber-like resin for the vessels and bronchi. Lung parenchyma, muscles and skin were not created...
May 4, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28472175/characterization-of-3d-printing-techniques-toward-patient-specific-quality-assurance-spine-shaped-phantom-for-stereotactic-body-radiation-therapy
#12
Min-Joo Kim, Seu-Ran Lee, Min-Young Lee, Jason W Sohn, Hyong Geon Yun, Joon Yong Choi, Sang Won Jeon, Tae Suk Suh
Development and comparison of spine-shaped phantoms generated by two different 3D-printing technologies, digital light processing (DLP) and Polyjet has been purposed to utilize in patient-specific quality assurance (QA) of stereotactic body radiation treatment. The developed 3D-printed spine QA phantom consisted of an acrylic body phantom and a 3D-printed spine shaped object. DLP and Polyjet 3D printers using a high-density acrylic polymer were employed to produce spine-shaped phantoms based on CT images. Image fusion was performed to evaluate the reproducibility of our phantom, and the Hounsfield units (HUs) were measured based on each CT image...
2017: PloS One
https://www.readbyqxmd.com/read/28471308/fabrication-of-orientation-controlled-3d-tissues-using-a-layer-by-layer-technique-and-3d-printed-a-thermo-responsive-gel-frame
#13
Yoshinari Tsukamoto, Takami Akagi, Fumiaki Shima, Mitsuru Akashi
Herein, we report the fabrication of orientation-controlled tissues similar to heart and nerve tissues using a cell accumulation and three-dimensional (3D) printing technique. We firstly evaluated the 3D shaping ability of hydroxybutyl chitosan (HBC), a thermo-responsive polymer, by using a robotic dispensing 3D printer. HBC polymer could be laminated to a height of 1,124 ± 14 μm. Based on this result, we fabricated 3D gel frames of various shapes such as square, triangular, rectangular and circular for shape control of 3D tissue and then normal human cardiac fibroblasts (NHCFs) coated with extracellular matrix (ECM) nanofilms were seeded in the frames...
May 4, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28459672/surfcuit-surface-mounted-circuits-on-3d-prints
#14
Nobuyuki Umetani, Ryan Schmidt
The SurfCuit system integrates circuits into 3D prints by mounting them on the printed surface. SurfCuit does not require tedious circuit casing design or expensive setups, allowing users to build complex, highly conductive circuit patterns for consumer-level desktop fused decomposition modeling (FDM) 3D printers and thus expediting the process of circuit construction for 3D models.https://extras.computer.org/extra/mcg2017030052s1.mp4.
2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/28450234/comparison-of-two-three-dimensional-printed-models-of-complex-intracranial-aneurysms-for-surgical-simulation
#15
Liang Wang, Xun Ye, Qiang Hao, Yu Chen, Xiaolin Chen, Hao Wang, Rong Wang, Yuanli Zhao, Jizong Zhao
OBJECT: To compare two three-dimensional (3D) printed models of intracranial aneurysms for simulation and training for complex aneurysm surgery. METHODS: The study included six complex or large aneurysm cases. We printed two 3D models of complex aneurysms based on computed tomography angiography (CTA) data using a 3D printer: a whole model, which was all-in-one printed hollow aneurysm method with colorful and multiple materials and included the hollow aneurysm, adjacent arteries, skull base, and nerves, and a regional model that included the hollow aneurysm and adjacent arteries...
April 24, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28445902/a-3d-printed-cap-with-sideoptics-for-colonoscopy-a-randomized-ex-vivo-study
#16
Benjamin M Walter, Alexander Hann, Rena Frank, Alexander Meining
Background Adequate polyp detection is crucial to colonoscopy; however, detection can be impaired. In particular, flat polyps located behind folds or near the colonic flexures appear to be a problem. We present a cheap and easily adjustable 3D-printed tool to enhance the view of a standard colonoscope using additional commercially available sideoptics. Materials and methods A cap adjustable to a standard endoscope was printed by a 3 D printer and had two microcameras fixed to offer two additional views...
April 26, 2017: Endoscopy
https://www.readbyqxmd.com/read/28436920/hybrid-3d-printing-and-electrodeposition-approach-for-controllable-3d-alginate-hydrogel-formation
#17
Wanfeng Shang, Yanting Liu, Wenfeng Wan, Chengzhi Hu, Zeyang Liu, Chin To Wong, Toshio Fukuda, Yajing Shen
Calcium alginate hydrogel is one of the most widely used biocompatible materials in biomedical and tissue engineering. This paper reports a hybrid 3D printing and electrodeposition approach to form the 3D calcium alginate hydrogel in a controllable manner. Firstly, a specific 3D printing system is developed by combining a 3D printer and a customized ejection syringe. Then, the mixed solution (1% w/v sodium alginate and 0.25% w/v CaCO3 nano particles) is filled in the syringe and ejected out from the nozzle to the substrate continuously...
April 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28425999/three-dimensional-printing-of-transparent-fused-silica-glass
#18
Frederik Kotz, Karl Arnold, Werner Bauer, Dieter Schild, Nico Keller, Kai Sachsenheimer, Tobias M Nargang, Christiane Richter, Dorothea Helmer, Bastian E Rapp
Glass is one of the most important high-performance materials used for scientific research, in industry and in society, mainly owing to its unmatched optical transparency, outstanding mechanical, chemical and thermal resistance as well as its thermal and electrical insulating properties. However, glasses and especially high-purity glasses such as fused silica glass are notoriously difficult to shape, requiring high-temperature melting and casting processes for macroscopic objects or hazardous chemicals for microscopic features...
April 19, 2017: Nature
https://www.readbyqxmd.com/read/28420749/inner-workings-3d-printer-innovations-tackle-complexity-of-metamaterials-living-tissue
#19
Katherine Bourzac
No abstract text is available yet for this article.
April 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28420248/creating-an-optimal-3d-printed-model-for-temporal-bone-dissection-training
#20
Kuniyuki Takahashi, Yuka Morita, Shinsuke Ohshima, Shuji Izumi, Yamato Kubota, Yutaka Yamamoto, Sugata Takahashi, Arata Horii
OBJECTIVE: Making a 3-dimensional (3D) temporal bone model is simple using a plaster powder bed and an inkjet printer. However, it is difficult to reproduce air-containing spaces and precise middle ear structures. The objective of this study was to overcome these problems and create a temporal bone model that would be useful both as a training tool and for preoperative simulation. METHODS: Drainage holes were made to remove excess materials from air-containing spaces, ossicle ligaments were manually changed to bony structures, and small and/or soft tissue structures were colored differently while designing the 3D models...
April 1, 2017: Annals of Otology, Rhinology, and Laryngology
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