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3d printer

Marco A Rendón-Medina, Laura Andrade-Delgado, Jose E Telich-Tarriba, Antonio Fuente-Del-Campo, Carlos A Altamirano-Arcos
Rapid prototyping models (RPMs) had been extensively used in craniofacial and maxillofacial surgery, especially in areas such as orthognathic surgery, posttraumatic or oncological reconstructions, and implantology. Economic limitations are higher in developing countries such as Mexico, where resources dedicated to health care are limited, therefore limiting the use of RPM to few selected centers. This article aims to determine the dimensional error of a low-cost fused deposition modeling 3D printer (Tronxy P802MA, Shenzhen, Tronxy Technology Co), with Open source software...
January 2018: Plastic and Reconstructive Surgery. Global Open
Michael P Chae, David J Hunter-Smith, Marie Rostek, Julian A Smith, Warren Matthew Rozen
Optimizing preoperative planning is widely sought in deep inferior epigastric artery perforator (DIEP) flap surgery. One reason for this is that rates of fat necrosis remain relatively high (up to 35%), and that adjusting flap design by an improved understanding of individual perforasomes and perfusion characteristics may be useful in reducing the risk of fat necrosis. Imaging techniques have substantially improved over the past decade, and with recent advances in 3D printing, an improved demonstration of imaged anatomy has become available...
January 2018: Plastic and Reconstructive Surgery. Global Open
Matthias Felix Haefner, Frederik Lars Giesel, Matthias Mattke, Daniel Rath, Moritz Wade, Jacob Kuypers, Alan Preuss, Hans-Ulrich Kauczor, Jens-Peter Schenk, Juergen Debus, Florian Sterzing, Roland Unterhinninghofen
We developed a new approach to produce individual immobilization devices for the head based on MRI data and 3D printing technologies. The purpose of this study was to determine positioning accuracy with healthy volunteers. 3D MRI data of the head were acquired for 8 volunteers. In-house developed software processed the image data to generate a surface mesh model of the immobilization mask. After adding an interface for the couch, the fixation setup was materialized using a 3D printer with acrylonitrile butadiene styrene (ABS)...
January 19, 2018: Oncotarget
Tobias Dahlberg, Tim Stangner, Hanqing Zhang, Krister Wiklund, Petter Lundberg, Ludvig Edman, Magnus Andersson
We report a novel method for fabrication of three-dimensional (3D) biocompatible micro-fluidic flow chambers in polydimethylsiloxane (PDMS) by 3D-printing water-soluble polyvinyl alcohol (PVA) filaments as master scaffolds. The scaffolds are first embedded in the PDMS and later residue-free dissolved in water leaving an inscription of the scaffolds in the hardened PDMS. We demonstrate the strength of our method using a regular, cheap 3D printer, and evaluate the inscription process and the channels micro-fluidic properties using image analysis and digital holographic microscopy...
February 20, 2018: Scientific Reports
Xuan Zhou, Haitao Cui, Margaret Nowicki, Shida Miao, Se-Jun Lee, Fahed Masood, Brent T Harris, Lijie Grace Zhang
Central nerve repair and regeneration remain challenging problems worldwide largely because of the extremely weak inherent regenerative capacity and accompanying fibrosis of native nerves. Inadequate solutions to unmet needs for clinical therapeutics encourage the development of novel strategies to promote nerve regeneration. Recently, 3D bioprinting techniques, as one of a set of valuable tissue engineering technologies, have shown great promise toward fabricating complex and customizable artificial tissue scaffolds...
February 20, 2018: ACS Applied Materials & Interfaces
Liang Wang, Xun Ye, Qiang Hao, Li Ma, Xiaolin Chen, Hao Wang, Yuanli Zhao
To develop a realistic model of middle cerebral artery (MCA) aneurysms using three-dimensional (3D) printing for surgical planning, research, and training of neurosurgical residents. This study included eight MCA aneurysm cases. The aneurysm together with the adjacent arteries and skull base were printed based on raw computed tomography angiography (CTA) data using a 3D printer with acrylonitrile-butadiene-styrene as the model material. The aneurysm models were used for surgical planning, and craniotomy and clipping practice by neurosurgical residents...
February 10, 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
De-Zhi Kang, Ping Chen, Qing-Song Lin, Yuan-Xiang Lin, Xi-Yue Wu, Pei-Sen Yao
OBJECTIVE: To investigate the value of 3D printed models with pathological entities in enhancing the learning curve of surgery of tuberculum sellae meningioma. METHODS: We printed four 3D printed models of tuberculum sellae meningiomas based on radiological data using a 3D printer. Participants were allocated to 3D group and atlas group. In the 3D group, participants learned surgery with the assistance of 3D models. In the atlas group, participants used only two-dimensional materials to assist their learning...
February 9, 2018: World Neurosurgery
Neerajha Nagarajan, Agnes Dupret-Bories, Erdem Karabulut, Pinar Zorlutuna, Nihal Engin Vrana
The impact of additive manufacturing in our lives has been increasing constantly. One of the frontiers in this change is the medical devices. 3D printing technologies not only enable the personalization of implantable devices with respect to patient-specific anatomy, pathology and biomechanical properties but they also provide new opportunities in related areas such as surgical education, minimally invasive diagnosis, medical research and disease models. In this review, we cover the recent clinical applications of 3D printing with a particular focus on implantable devices...
February 8, 2018: Biotechnology Advances
Bora Lee, Kyung Chul Oh, Daewon Haam, Joon-Hee Lee, Hong-Seok Moon
STATEMENT OF PROBLEM: Intraoral scanners are effective for direct digital impression when dental restorations are fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM); however, if the abutment tooth cannot be dried completely or the prepared margin is placed subgingivally, accurate digital images cannot always be guaranteed. PURPOSE: The purpose of this in vitro study was to compare the internal and marginal discrepancies of zirconia copings fabricated directly using an intraoral scanner with those fabricated indirectly with impression scanning...
February 7, 2018: Journal of Prosthetic Dentistry
Jing Nie, Qing Gao, Jing-Jiang Qiu, Miao Sun, An Liu, Lei Shao, Jianzhong Fu, Peng Zhao, Yong He
The field of how to rapidly assemble microfluidics with modular components continuously attracts researchers' attention, however extra efforts must be devoted to solving the problems of leaking and aligning between individual modules. This paper presents a novel type of modular microfluidic device, driven by capillary force. There is no necessity for a strict seal or special alignment, and its open structures make it easy to integrate various stents and reactants. The key rationale for this method is to print different functional modules with a low-cost three-dimensional (3D) printer, then fill the channels with capillary materials and assemble them with plugs like Lego® bricks...
February 8, 2018: Biofabrication
Juan Yi, Xiaojiao Chen, Chaoyang Song, Zheng Wang
A novel pneumatic soft linear actuator Fiber-reinforced Origamic Robotic Actuator (FORA) is proposed with significant improvements on the popular McKibben-type actuators, offering nearly doubled motion range, substantially improved force profile, and significantly lower actuation pressure. The desirable feature set is made possible by a novel soft origamic chamber that expands radially while contracts axially when pressurized. Combining this new origamic chamber with a reinforcing fiber mesh, FORA generates very high traction force (over 150N) and very large contractile motion (over 50%) at very low input pressure (100 kPa)...
February 2018: Soft Robotics
Borhan Alhosseini Hamedani, Alexa Melvin, Kirubahara Vaheesan, Sameer Gadani, Keith Pereira, Andrew F Hall
PURPOSE: The goal of this work was to develop phantoms for the optimization of pre-operative computed tomography (CT) scans of the prostate artery, which are used for embolization planning. METHODS: Acrylonitrile butadiene styrene (ABS) pellets were doped with barium sulfate and extruded into filaments suitable for 3D printing on a fused deposition modeling (FDM) printer. Cylinder phantoms were created to evaluate radiopacity as a function of doping percentage. Small-diameter tree phantoms were created to assess their composition and dimensional accuracy...
February 7, 2018: Journal of Applied Clinical Medical Physics
Yunyao Jiang, Yaning Li
By combining the two basic deformation mechanisms for auxetic open-cell metamaterials, re-entrant angle and chirality, new hybrid chiral mechanical metamaterials are designed and fabricated via a multi-material 3D printer. Results from mechanical experiments on the 3D printed prototypes and systematic Finite Element (FE) simulations show that the new designs can achieve subsequential cell-opening mechanism under a very large range of overall strains (2.91%-52.6%). Also, the effective stiffness, the Poisson's ratio and the cell-opening rate of the new designs can be tuned in a wide range by tailoring the two independent geometric parameters: the cell size ratio [Formula: see text], and re-entrant angle θ...
February 5, 2018: Scientific Reports
Guodong Zhang, Zhengxi Yu, Xuanhuang Chen, Xu Chen, Changfu Wu, Yijun Lin, Wenhua Huang, Haibin Lin
OBJECTIVE: Accurate placement of cervical pedicle screws remains a surgical challenge. This study aimed to test the feasibility of using a novel three-dimensional (3D-)printed navigational template to overcome this challenge. METHODS: Cervical spines were scanned using computed tomography (CT). A 3D model of the cervical spines was created. The screw trajectory was designed to pass through the central axis of the pedicle. Thereafter, a navigational template was designed by removing the soft tissue from the bony surface in the 3D model...
January 31, 2018: Der Orthopäde
Kent Evans, Zachary C Kennedy, Bruce W Arey, Josef F Christ, Herbert Todd Schaef, Satish K Nune, Rebecca L Erikson
Metal-organic frameworks (MOFs) exhibit exceptional properties and are widely investigated because of their structural and functional versatility relevant to catalysis, separations, and sensing applications. However, their commercial or large-scale application is often limited by their powder forms which make integration into devices challenging. Here, we report the production of MOF-thermoplastic polymer composites in well-defined and customizable forms and with complex internal structural features accessed via a standard 3D printer...
January 31, 2018: ACS Applied Materials & Interfaces
Peter McAllister, Melanie Watson, Ezra Burke
Introduction: Technological advances in 3D printing can dramatically improve orthognathic surgical planning workflow. Custom positioning and cutting guides enable intraoperative reproduction of pre-planned osteotomy cuts and can result in greater surgical accuracy and patient safety. Objectives: This short paper describes the use of freeware (some with open-source) combined with in-house 3D printing facilities to produce reliable, affordable osteotomy cutting guides...
March 2018: Journal of Maxillofacial and Oral Surgery
M T Ugidos Lozano, F Blaya Haro, Alessandro Ruggiero, S Manzoor, S Nuere Menendez-Pidal, J A Juanes Méndez
The use of different technological devices that allow the creation of three-dimensional models is in constant evolution, allowing a greater application of these technologies in different fields of health sciences and medical training. The equipment for digitalization is becoming increasingly sophisticated allowing obtaining three-dimensional which are more defined and similar to real image and original object. In this work, different modalities of designing 3D anatomical models of bone pieces are presented, for use by students of different disciplines in Health Sciences...
January 25, 2018: Journal of Medical Systems
Bilal Khatri, Karl Lappe, Dorit Noetzel, Kilian Pursche, Thomas Hanemann
In this work, a 3D printed polymer-metal soft-magnetic composite was developed and characterized for its material, structural, and functional properties. The material comprises acrylonitrile butadiene styrene (ABS) as the polymer matrix, with up to 40 vol. % stainless steel micropowder as the filler. The composites were rheologically analyzed and 3D printed into tensile and flexural test specimens using a commercial desktop 3D printer. Mechanical characterization revealed a linearly decreasing trend of the ultimate tensile strength (UTS) and a sharp decrease in Young's modulus with increasing filler content...
January 25, 2018: Materials
Nicolaos Scoutaris, Steven A Ross, Dennis Douroumis
PURPOSE: Three- dimensional (3D) printing has received significant attention as a manufacturing process for pharmaceutical dosage forms. In this study, we used Fusion Deposition Modelling (FDM) in order to print "candy - like" formulations by imitating Starmix® sweets to prepare paediatric medicines with enhanced palatability. METHODS: Hot melt extrusion processing (HME) was coupled with FDM to prepare extruded filaments of indomethacin (IND), hypromellose acetate succinate (HPMCAS) and polyethylene glycol (PEG) formulations and subsequently feed them in the 3D printer...
January 16, 2018: Pharmaceutical Research
Junhui Fu, Xiang Yu, Yiguang Jin
Vaginal rings are gynecological drug delivery devices with fixed shapes, sizes and drug doses. Here 3D printed personalized progesterone-loaded vaginal rings were prepared. Progesterone was mixed with polyethylene glycol (PEG) 4000 to form a solid dispersion that was cut into pieces. The mixture of poly(lactic acid) (PLA)/polycaprolactone (PCL) (8:2) and Tween 80 were mixed with the above pieces and hot-melted to form filaments. A fused deposition modeling (FDM) printer was used to prepare "O", "Y" or "M"-shaped vaginal rings with the filaments...
January 21, 2018: International Journal of Pharmaceutics
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