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3d-printing

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https://www.readbyqxmd.com/read/29775913/mobile-phone-based-evaluation-of-latent-tuberculosis-infection-proof-of-concept-for-an-integrated-image-capture-and-analysis-system
#1
Safa Naraghi, Tinashe Mutsvangwa, René Goliath, Molebogeng X Rangaka, Tania S Douglas
BACKGROUND: The tuberculin skin test is the most widely used method for detecting latent tuberculosis infection in adults and active tuberculosis in children. We present the development of a mobile-phone based screening tool for measuring the tuberculin skin test induration. METHOD: The tool makes use of a mobile application developed on the Android platform to capture images of an induration, and photogrammetric reconstruction using Agisoft PhotoScan to reconstruct the induration in 3D, followed by 3D measurement of the induration with the aid of functions from the Python programming language...
May 8, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29774617/3d-structured-stretchable-strain-sensors-for-out-of-plane-force-detection
#2
Zhiyuan Liu, Dianpeng Qi, Wan Ru Leow, Jiancan Yu, Michele Xiloyannnis, Leonardo Cappello, Yaqing Liu, Bowen Zhu, Ying Jiang, Geng Chen, Lorenzo Masia, Bo Liedberg, Xiaodong Chen
Stretchable strain sensors, as the soft mechanical interface, provide the key mechanical information of the systems for healthcare monitoring, rehabilitation assistance, soft exoskeletal devices, and soft robotics. Stretchable strain sensors based on 2D flat film have been widely developed to monitor the in-plane force applied within the plane where the sensor is placed. However, to comprehensively obtain the mechanical feedback, the capability to detect the out-of-plane force, caused by the interaction outside of the plane where the senor is located, is needed...
May 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29774211/3d-printed-e-tongue
#3
Gabriel Gaál, Tatiana A da Silva, Vladimir Gaál, Rafael C Hensel, Lucas R Amaral, Varlei Rodrigues, Antonio Riul
Nowadays, one of the biggest issues addressed to electronic sensor fabrication is the build-up of efficient electrodes as an alternative way to the expensive, complex and multistage processes required by traditional techniques. Printed electronics arises as an interesting alternative to fulfill this task due to the simplicity and speed to stamp electrodes on various surfaces. Within this context, the Fused Deposition Modeling 3D printing is an emerging, cost-effective and alternative technology to fabricate complex structures that potentiates several fields with more creative ideas and new materials for a rapid prototyping of devices...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29774184/a-systematic-review-of-clinical-value-of-three-dimensional-printing-in-renal-disease
#4
Zhonghua Sun, Dongting Liu
The aim of this systematic review is to analyse current literature related to the clinical value of three-dimensional (3D) printed models in renal disease. A literature search of PubMed and Scopus databases was performed to identify studies reporting the clinical application and usefulness of 3D printed models in renal disease. Fifteen studies were found to meet the selection criteria and were included in the analysis. Eight of them provided quantitative assessments with five studies focusing on dimensional accuracy of 3D printed models in replicating renal anatomy and tumour, and on measuring tumour volume between 3D printed models and original source images and surgical specimens, with mean difference less than 10%...
April 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29772802/effect-of-ultrasonic-vibration-on-mechanical-properties-of-3d-printing-non-crystalline-and-semi-crystalline-polymers
#5
Guiwei Li, Ji Zhao, Wenzheng Wu, Jili Jiang, Bofan Wang, Hao Jiang, Jerry Ying Hsi Fuh
Fused deposition modeling 3D printing has become the most widely used additive manufacturing technology because of its low manufacturing cost and simple manufacturing process. However, the mechanical properties of the 3D printing parts are not satisfactory. Certain pressure and ultrasonic vibration were applied to 3D printed samples to study the effect on the mechanical properties of 3D printed non-crystalline and semi-crystalline polymers. The tensile strength of the semi-crystalline polymer polylactic acid was increased by 22...
May 17, 2018: Materials
https://www.readbyqxmd.com/read/29771086/-design-of-cross-sectional-anatomical-model-focused-on-drainage-pathways-of-paranasal-sinuses
#6
Y Zha, W Lv, Y L Gao, Z Z Zhu, Z Q Gao
Objective: To design and produce cross-sectional anatomical models of paranasal sinuses for the purpose of demonstrating drainage pathways of each nasal sinus for the young doctors. Method: We reconstructed the three-dimensional model of sinuses area based on CT scan data, and divided it into 5 thick cross-sectional anatomy models by 4 coronal plane,which cross middle points of agger nasi cell, ethmoid bulla, posterior ethmoid sinuses and sphenoid sinus respectively. Then a 3D printerwas used to make anatomical cross-sectional anatomical models...
May 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29770296/an-overview-of-mechanical-circulatory-support-in-single-ventricle-patients
#7
REVIEW
Jacob R Miller, Timothy S Lancaster, Connor Callahan, Aaron M Abarbanell, Pirooz Eghtesady
The population of people with a single-ventricle is continually increasing due to improvements across the spectrum of medical care. Unfortunately, a proportion of these patients will develop heart failure. Often, for these patients, mechanical circulatory support (MCS) represents the only available treatment option. While single-ventricle patients currently represent a small proportion of the total number of patients who receive MCS, as the single-ventricle patient population increases, this number will increase as well...
April 2018: Translational Pediatrics
https://www.readbyqxmd.com/read/29770294/three-dimensional-modelling-and-three-dimensional-printing-in-pediatric-and-congenital-cardiac-surgery
#8
REVIEW
Laszlo Kiraly
Three-dimensional (3D) modelling and printing methods greatly support advances in individualized medicine and surgery. In pediatric and congenital cardiac surgery, personalized imaging and 3D modelling presents with a range of advantages, e.g., better understanding of complex anatomy, interactivity and hands-on approach, possibility for preoperative surgical planning and virtual surgery, ability to assess expected results, and improved communication within the multidisciplinary team and with patients. 3D virtual and printed models often add important new anatomical findings and prompt alternative operative scenarios...
April 2018: Translational Pediatrics
https://www.readbyqxmd.com/read/29770292/innovative-interventional-catheterization-techniques-for-congenital-heart-disease
#9
REVIEW
Jeffrey D Zampi, Wendy Whiteside
Since 1929, when the first cardiac catheterization was safely performed in a human by Dr. Werner Forssmann (on himself), there has been a rapid progression of cardiac catheterization techniques and technologies. Today, these advances allow us to treat a wide variety of patients with congenital heart disease using minimally invasive techniques; from fetus to infants to adults, and from simple to complex congenital cardiac lesions. In this article, we will explore some of the exciting advances in cardiac catheterization for the treatment of congenital heart disease, including transcatheter valve implantation, hybrid procedures, biodegradable technologies, and magnetic resonance imaging (MRI)-guided catheterization...
April 2018: Translational pediatrics
https://www.readbyqxmd.com/read/29770160/active-tube-shaped-actuator-with-embedded-square-rod-shaped-ionic-polymer-metal-composites-for-robotic-assisted-manipulation
#10
Yanjie Wang, Jiayu Liu, Denglin Zhu, Hualing Chen
This paper reports a new technique involving the design, fabrication, and characterization of an ionic polymer-metal composite- (IPMC-) embedded active tube, which can achieve multidegree-of-freedom (MODF) bending motions desirable in many applications, such as a manipulator and an active catheter. However, traditional strip-type IPMC actuators are limited in only being able to generate 1-dimensional bending motion. So, in this paper, we try to develop an approach which involves molding or integrating rod-shaped IPMC actuators into a soft silicone rubber structure to create an active tube...
2018: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29768115/three-dimensional-printing-of-vitrification-loop-prototypes-for-aquatic-species
#11
Nolan J Tiersch, William M Childress, Terrence R Tiersch
Vitrification is a method of cryopreservation that freezes samples rapidly, while forming an amorphous solid ("glass"), typically in small (μL) volumes. The goal of this project was to create, by three-dimensional (3D) printing, open vitrification devices based on an elliptical loop that could be efficiently used and stored. Vitrification efforts can benefit from the application of 3D printing, and to begin integration of this technology, we addressed four main variables: thermoplastic filament type, loop length, loop height, and method of loading...
May 16, 2018: Zebrafish
https://www.readbyqxmd.com/read/29765087/fabrica-a-bioreactor-platform-for-printing-perfusing-observing-stimulating-3d-tissues
#12
Lester J Smith, Ping Li, Mark R Holland, Burcin Ekser
We are introducing the FABRICA, a bioprinter-agnostic 3D-printed bioreactor platform designed for 3D-bioprinted tissue construct culture, perfusion, observation, and analysis. The computer-designed FABRICA was 3D-printed with biocompatible material and used for two studies: (1) Flow Profile Study: perfused 5 different media through a synthetic 3D-bioprinted construct and ultrasonically analyzed the flow profile at increasing volumetric flow rates (VFR); (2) Construct Perfusion Study: perfused a 3D-bioprinted tissue construct for a week and compared histologically with a non-perfused control...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29764458/cone-beam-computed-tomography-in-implant-dentistry-recommendations-for-clinical-use
#13
Reinhilde Jacobs, Benjamin Salmon, Marina Codari, Bassam Hassan, Michael M Bornstein
BACKGROUND: In implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines...
May 15, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29763597/a-hem-o-lok-induced-tracheoesophageal-fistula-cured-by-temporary-airway-stenting-modified-with-three-dimensional-printing
#14
Yichao Han, Su Yang, Wei Huang, Zhongmin Wang, Hecheng Li
We present the case of a fistula between the trachea and the esophagogastric anastomosis in a 58-year-old male after esophagectomy. A Hem-o-Lok clip used at the time to ligate the azygos vein was discovered by esophagoscopy and bronchoscopy to be eroding into the both structures. A covered self-expandable Y-shaped metallic tracheobronchial stent was customized with a 3D printed airway model and inserted in place, with endoscopic injection of fibrin glue to the anastomotic site. 64 days after implantation, the stent was withdrawn with complete healing of the fistula...
May 12, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29763548/zein-increases-the-cytoaffinity-and-biodegradability-of-scaffolds-3d-printed-with-zein-and-poly-%C3%AE%C2%B5-caprolactone-composite-ink
#15
Linzhi Jing, Xiang Wang, Hang Liu, Yuyun Lu, Jinsong Bian, Jie Sun, Dejian Huang
Electrohydrodynamic printing (EHDP) has attracted extensive interests as a powerful technology to fabricate micro to nanoscale fibrous scaffolds in a custom-tailored manner for biomedical applications. A few synthetic biopolymer inks are applicable to this EHDP technology, but the fabricated scaffolds suffered from low mechanical strength, biocompatibility and biodegradability. In this study, a series of poly(ε-caprolactone)(PCL)/zein composite inks were developed and their printability was examined on a solution-based EHDP system for scaffold fabrication...
May 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29761988/-research-on-preparation-and-performance-of-ceramic-denture-materials-applied-for-three-dimensional-printing
#16
Jing Zhou, Guolin Duan
The micro-flow extrusion forming of ceramic material has not been developed in three dimensional (3D) printing field. The shape forming of material is by bonding and stacking of filaments of ceramic slurry extruded through micro-sized pores with rather large gaps and porosities, which can affect material's density after sintering and its mechanical property thereafter. Aiming at such a deficiency of this process, the preparation method of ceramic denture printing paste applicable to the process is studied, and the properties of slurry and sintering performance are analyzed and tested...
December 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29761982/-study-on-the-geometric-characteristics-and-distribution-of-porosities-in-three-dimensional-printed-ti-6al-4v-titanium-alloy
#17
Zhipeng Wan, Wentao Jiang, Chong Wang, Qingyuan Wang, Yalan Li
Three dimensional (3D) printing is considered as an advanced manufacturing technology because of its additive nature. Electron beam melting (EBM) is a widely used 3D printing processes for the manufacturing of metal components. However, the products printed via this process generally contain micro porosities which affect mechanical properties, especially the fatigue property. In this paper, two types of EBM printed samples of the Ti-6Al-4V alloy, one with a round cross section and the other with a triangle cross section, were employed to investigate the existence of porosities using computed tomography (CT)...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29761422/computational-pre-surgical-planning-of-arterial-patch-reconstruction-parametric-limits-and-in-vitro-validation
#18
S Samaneh Lashkarinia, Senol Piskin, Tijen A Bozkaya, Ece Salihoglu, Can Yerebakan, Kerem Pekkan
Surgical treatment of congenital heart disease (CHD) involves complex vascular reconstructions utilizing artificial and native surgical materials. A successful surgical reconstruction achieves an optimal hemodynamic profile through the graft in spite of the complex post-operative vessel growth pattern and the altered pressure loading. This paper proposes a new in silico patient-specific pre-surgical planning framework for patch reconstruction and investigates its computational feasibility. The proposed protocol is applied to the patch repair of main pulmonary artery (MPA) stenosis in the Tetralogy of Fallot CHD template...
May 14, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29759249/in-line-carbon-nanofiber-reinforced-hollow-fiber-mediated-liquid-phase-microextraction-using-a-3d-printed-extraction-platform-as-a-front-end-to-liquid-chromatography-for-automatic-sample-preparation-and-analysis-a-proof-of-concept-study
#19
Chanatda Worawit, David J Cocovi-Solberg, Pakorn Varanusupakul, Manuel Miró
A novel concept for automation of nanostructured hollow-fiber supported microextraction, combining the principles of liquid-phase microextraction (LPME) and sorbent microextraction synergically, using mesofluidic platforms is proposed herein for the first time, and demonstrated with the determination of acidic drugs (namely, ketoprofen, ibuprofen, diclofenac and naproxen) in urine as a proof-of-concept applicability. Dispersed carbon nanofibers (CNF) are immobilized in the pores of a single-stranded polypropylene hollow fiber (CNF@HF) membrane, which is thereafter accommodated in a stereolithographic 3D-printed extraction chamber without glued components for ease of assembly...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29759214/improving-thermal-control-of-capillary-electrophoresis-with-mass-spectrometry-and-capacitively-coupled-contactless-conductivity-detection-by-using-3d-printed-cartridges
#20
Kelliton José Mendonça Francisco, Claudimir Lucio do Lago
A 3D-printed cartridge was developed to improve the interface between a capillary electrophoresis instrument and a mass spectrometer. The thermostated airflow from the CE was guided to the entrance of the electrospray source keeping as much as possible the silica capillary in a proper Joule-heating dissipation environment. Hollow 3D-printed walls made of ABS covered by a 0.2 mm thick copper foil on the inner side were used. The cartridge also allows including up to two capacitively coupled contactless conductivity detectors (C4 Ds)...
August 1, 2018: Talanta
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