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https://www.readbyqxmd.com/read/28749372/3d-printing-a-family-of-biomimetic-models-to-explain-armored-grasping-in-syngnathid-fishes
#1
Michael M Porter, Nakul Ravikumar
Seahorses and pipehorses evolved at least two independent strategies for tail grasping, despite being armored with a heavy body plating. To help explain mechanical trade-offs associated with the different designs, we created a "family" of 3D-printed models that mimic variations in the presence and size of their armored plates. We measured the performance of the biomimetic proxies across seven mechanical metrics, representative of their protective and prehensile capacities. Our results show that the models mimicking the tails of seahorses are the best all-around performers, while those of the distal-most, prehensile region of pipehorses are more flexible, but less protected...
July 27, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28747594/mechanical-and-biological-effects-of-infiltration-with-biopolymers-on-3d-printed-tricalciumphosphate-scaffolds
#2
Matthias Cornelsen, Florian Andreas Probst, Christina Schwarz, Egon Burian, Matthias Tröltzsch, Sven Otto, Maximilian Michael Saller, Matthias Schieker, Hermann Seitz
The aim of this study was to evaluate the influence of infiltrating 3D printed (TCP) scaffolds with different biodegradable polymers on their mechanical and biological properties. 3D printed TCP scaffolds with interconnecting channels measuring 450±50 µm were infiltrated with four different biodegradable copolymers. To determine the average compressive strength, a uniaxial testing system was used. Additionally, scaffolds were seeded with MC3T3 cells and cell viability was assessed by live/dead-assay. Uninfiltrated TCP had an average compression strength of 1...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28746418/a-user-friendly-low-cost-turbidostat-with-versatile-growth-rate-estimation-based-on-an-extended-kalman-filter
#3
Stefan A Hoffmann, Christian Wohltat, Kristian M Müller, Katja M Arndt
For various experimental applications, microbial cultures at defined, constant densities are highly advantageous over simple batch cultures. Due to high costs, however, devices for continuous culture at freely defined densities still experience limited use. We have developed a small-scale turbidostat for research purposes, which is manufactured from inexpensive components and 3D printed parts. A high degree of spatial system integration and a graphical user interface provide user-friendly operability. The used optical density feedback control allows for constant continuous culture at a wide range of densities and offers to vary culture volume and dilution rates without additional parametrization...
2017: PloS One
https://www.readbyqxmd.com/read/28742761/preparation-and-assessment-of-an-individualized-navigation-template-for-lower-cervical-anterior-transpedicular-screw-insertion-using-a-three-dimensional-printing-technique
#4
FengNing Li, Xuan Huang, Kun Wang, BeiEr Luo, Fan Zhang, Zhi Chen, Quan Li, YongJin Zhang, Ke Qi, ChengChun Jin, WangShenJie Chen, CangLong Hou, HongXing Shen
STUDY DESIGN: Prospective trial. OBJECTIVE: To establish an individualized navigation template for safe and accurate insertion of lower cervical anterior transpedicular screw (ATPS) based on a three-dimensional (3D) printing technique. SUMMARY OF BACKGROUND DATA: Conventional screw insertion manually under fluoroscopy easily leading to deviation of ATPS screw channel, cervical instrumentation procedures demand the need for a precise technique for screw placement...
July 24, 2017: Spine
https://www.readbyqxmd.com/read/28741361/3d-printed-shape-memory-objects-based-on-olefin-ionomer-of-zinc-neutralized-poly-ethylene-co-methacrylic-acid
#5
Zhiyang Zhao, Fang Peng, Kevin A Cavicchi, Mukerrem Miko Cakmak, Robert A Weiss, Bryan D Vogt
3D printing enables the net shape manufacturing of objects with minimal material waste and low tooling costs, but the functionality is generally limited by available materials, especially for extrusion based printing such as Fused Deposition Modeling (FDM). Here we demonstrate shape memory behavior of 3D printed objects with FDM using a commercially available olefin ionomer, Surlyn 9520, which is zinc neutralized poly(ethylene-co-methacrylic acid). The initial fixity for 3D printed and compression molded samples was similar, but the initial recovery was much lower for the 3D printed sample (R=58%) than the compression molded sample (R=83%)...
July 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28741350/3d-printed-and-microcontrolled-the-one-hundred-dollars-scanning-electrochemical-microscope
#6
Gabriel Negrão Meloni
The design and fabrication of a versatile and low-cost Electrochemical Scanning Probe Microscope (EC-SPM) is presented. The proposed equipment relies on the use of modern prototyping tools such as 3D printers and microcontroller boards and only a few "off-the-shelf" parts to deliver a simple yet powerful EC-SPM equipment capable of performing simple space resolved electrochemical measurements. The equipment was able to perform space resolved electrochemical measurements using a Platinum ultramicroelectrode (UME) as the working electrode on a Scanning Electrochemical Microscope (SECM) configuration and was used to record approach curves, line scans and array scans over an insulating substrate...
July 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28741218/asymmetric-pedicle-subtractionosteotomy-apso-guided-by-a-3d-printed-model-to-correct-a-combined-fixed-sagittal-and-coronal-imbalance
#7
Pierre-Pascal Girod, S Hartmann, P Kavakebi, J Obernauer, M Verius, C Thomé
Surgical correction of fixed thoracolumbar deformity is usually achieved by estimating the preoperatively planned correction angles during surgery and is therefore prone to inaccuracy. This is particularly problematic in biplanar deformities. To overcome these difficulties, 3D model for planning, preparation, and simulation of an asymmetric pedicle subtraction osteotomy (aPSO) was printed and used to realign coronal and sagittal balance in case of rigid degenerative kyphoscoliosis. A 59-year-old woman presented with severe back pain and spinal claudication and was diagnosed with a rigid kyphoscoliosis with multilevel spinal stenosis...
July 24, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28740679/three-dimensional-printing-guided-precise-surgery-for-right-sided-aortic-arch-associated-with-kommerell-s-diverticulum
#8
Nan Chen, Kai Zhu, Hongqiang Zhang, Xiaoning Sun, Chunsheng Wang
Right-sided aortic arch associated with Kommerell's diverticulum is a rare congenital defect of aorta with complexity. The challenging surgical treatment calls for a direct and entire visibility of aorta and its branches which can be provided by the three-dimensional (3D) printing technique. A 42-year-old man with right-sided aortic arch, Kommerell's diverticulum and an aberrant left subclavian artery underwent the surgery with the guiding assistance of 3D printed model. The satisfying outcome suggests the novel combination of 3D printing technique and surgical procedure a promising perspective on treating complex aortic defect...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28738372/advances-in-oral-appliances-for-obstructive-sleep-apnea
#9
Ofer Jacobowitz
Oral appliances that advance the mandible are widely used as alternatives to positive airway pressure (PAP) devices or as primary therapy for obstructive sleep apnea (OSA) in adults. Although PAP is more efficacious at lowering the polysomnographic indices of OSA, the clinical effectiveness of PAP and oral appliances is similar, and patients are more likely to adhere to oral appliance therapy than to PAP treatment. Clinical examination is used to determine the candidacy of oral appliances and to select a particular appliance for a given patient...
2017: Advances in Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28737375/matrix-assisted-3d-printing-of-cellulose-nanofibers-for-paper-microfluidics
#10
Sungchul Shin, Jinho Hyun
Cellulose nanofiber (CNF), one of the most attractive green bioresources, was adopted for construction of microfluidic devices using matrix-assisted 3D printing. CNF hydrogels can support structures printed using CAD design in a 3D hydrogel environment with the appropriate combination of rheological properties between the CNF hydrogel and ink materials. Amazingly, the structure printed freely in bulky CNF hydrogels was able to retain its highly resolved 3D features in an ultrathin 2D paper using a simple drying process...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28736923/applications-of-additive-manufacturing-in-dentistry-a-review
#11
REVIEW
Aishwarya Bhargav, Vijayavenkatraman Sanjairaj, Vinicius Rosa, Lu Wen Feng, Jerry Fuh Yh
Additive manufacturing (AM) or 3D printing has been hailed as the third industrial revolution as it has caused a paradigm shift in the way objects have been manufactured. Conventionally, converting a raw material to a fully finished and assembled, usable product comprises several steps which can be eliminated by using this process as functional products can be created directly from the raw material at a fraction of the time originally consumed. Thus, AM has found applications in several sectors including automotive, aerospace, printed electronics, and healthcare...
July 24, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28736514/design-and-validation-of-exoskeleton-actuated-by-soft-modules-toward-neurorehabilitation-vision-based-control-for-precise-reaching-motion-of-upper-limb
#12
Victoria W Oguntosin, Yoshiki Mori, Hyejong Kim, Slawomir J Nasuto, Sadao Kawamura, Yoshikatsu Hayashi
We demonstrated the design, production, and functional properties of the Exoskeleton Actuated by the Soft Modules (EAsoftM). Integrating the 3D printed exoskeleton with passive joints to compensate gravity and with active joints to rotate the shoulder and elbow joints resulted in ultra-light system that could assist planar reaching motion by using the vision-based control law. The EAsoftM can support the reaching motion with compliance realized by the soft materials and pneumatic actuation. In addition, the vision-based control law has been proposed for the precise control over the target reaching motion within the millimeter scale...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28734609/reinforcements-in-avian-wing-bones-experiments-analysis-and-modeling
#13
E Novitskaya, C J Ruestes, M M Porter, V A Lubarda, M A Meyers, J McKittrick
Almost all species of modern birds are capable of flight; the mechanical competency of their wings and the rigidity of their skeletal system evolved to enable this outstanding feat. One of the most interesting examples of structural adaptation in birds is the internal structure of their wing bones. In flying birds, bones need to be sufficiently strong and stiff to withstand forces during takeoff, flight, and landing, with a minimum of weight. The cross-sectional morphology and presence of reinforcing structures (struts and ridges) found within bird wing bones vary from species to species, depending on how the wings are utilized...
July 14, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28734022/3d-printed-vascularized-device-for-subcutaneous-transplantation-of-human-islets
#14
Marco Farina, Andrea Ballerini, Daniel Fraga, Eugenia Nicolov Matthew Hogan, Danilo Demarchi, Francesco Scaglione, Omaima Sabek, Philip Horner, Usha Thekkedath, Osama Gaber, Alessandro Grattoni
Transplantation of pancreatic islets or stem cell derived insulin secreting cells is an attractive treatment strategy for diabetes. However, islet transplantation is associated with several challenges including function-loss associated with dispersion and limited vascularization as well as the need for continuous immunosuppression. To overcome these limitations, here we present a novel 3D printed and functionalized encapsulation system for subcutaneous engraftment of islets or islet like cells. The devices were 3D printed with polylactic acid and the surfaces treated and patterned to increase the hydrophilicity, cell attachment and proliferation...
July 22, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28732777/how-useful-is-3d-printing-in-maxillo-facial-surgery
#15
A Louvrier, P Marty, E Weber, E Euvrard, B Chatelain, A Barrabé, C Meyer
INTRODUCTION: 3D-printing seems to have more and more applications in maxillofacial surgery (MFS), particularly since the release on the market of general use 3D-printers several years ago. The aim of our study was to answer 4 questions: 1. Who uses 3D printing in MFS and is it routine or not? 2. What are the main clinical indications for 3D-printing in MFS and what are the kinds of objects that are used? 3. Are these objects printed by an official medical device (MD) manufacturer or made directly within the department or the lab? 4...
July 18, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28731812/3d-printed-visceral-aneurysm-models-based-on-ct-data-for-simulations-of-endovascular-embolization-evaluation-of-size-and-shape-accuracy
#16
Eisuke Shibata, Hidemasa Takao, Shiori Amemiya, Kuni Ohtomo
OBJECTIVE: The objective of this study is to verify the accuracy of 3D-printed hollow models of visceral aneurysms created from CT angiography (CTA) data, by evaluating the sizes and shapes of aneurysms and related arteries. SUBJECTS AND METHODS: From March 2006 to August 2015, 19 true visceral aneurysms were embolized via interventional radiologic treatment provided by the radiology department at our institution; aneurysms with bleeding (n = 3) or without thin-slice (< 1 mm) preembolization CT data (n = 1) were excluded...
August 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28729190/systematic-review-of-the-use-of-3-dimensional-printing-in-surgical-teaching-and-assessment
#17
Benjamin Langridge, Sheikh Momin, Ben Coumbe, Evelina Woin, Michelle Griffin, Peter Butler
OBJECTIVE: The use of 3-dimensional (3D) printing in medicine has rapidly expanded in recent years as the technology has developed. The potential uses of 3D printing are manifold. This article provides a systematic review of the uses of 3D printing within surgical training and assessment. METHODS: A structured literature search of the major literature databases was performed in adherence to PRISMA guidelines. Articles that met predefined inclusion and exclusion criteria were appraised with respect to the key objectives of the review and sources of bias were analysed...
July 17, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28728010/advances-in-point-of-care-technologies-for-molecular-diagnostics
#18
REVIEW
Mohammad Zarei
Advances in miniaturization, nanotechnology, and microfluidics, along with developments in cloud-connected point-of-care (POC) diagnostics technologies are pushing the frontiers of POC devices toward low-cost, user-friendly, and enhanced sensitivity molecular-level diagnostics. The combination of various bio-sensing platforms within smartphone-integrated electronic readers provides accurate on-site and on-time diagnostics based on various types of chemical and biological targets. Further, 3D printing technology shows a huge potential toward fabrication and improving the performance of POC devices...
July 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28727917/a-3d-printed-portable-optical-sensing-platform-for-smartphones-capable-of-detecting-the-herbicide-2-4-dichlorophenoxyacetic-acid
#19
Yijia Wang, Mohamed Maarouf Ali Zeinhom, Mingming Yang, Rongrong Sun, Shengfu Wang, Jordan N Smith, Charles Timchalk, Lei Li, Yuehe Lin, Dan Du
Onsite rapid detection of herbicide and herbicide residuals in environmental and biological specimens is important for agriculture, environment, food safety, and health care. Traditional method for herbicide detection requires expensive laboratory equipment and a long turn-round time. In this work, we developed a single-stripe microliter plate smartphone colorimetric device for rapid and low-cost in-field test. This portable smartphone platform is capable of screening 8 samples in a microplate single-stripe...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28727787/feasibility-of-a-3d-printed-anthropomorphic-patient-specific-head-phantom-for-patient-specific-quality-assurance-of-intensity-modulated-radiotherapy
#20
Ji Woon Yea, Jae Won Park, Sung Kyu Kim, Dong Youn Kim, Jae Gu Kim, Chan Young Seo, Won Hyo Jeong, Man Youl Jeong, Se An Oh
This study evaluated the feasibility of utilizing a 3D-printed anthropomorphic patient-specific head phantom for patient-specific quality assurance (QA) in intensity-modulated radiotherapy (IMRT). Contoured left and right head phantoms were converted from DICOM to STL format. Fused deposition modeling (FDM) was used to construct an anthropomorphic patient-specific head phantom with a 3D printer. An established QA technique and the patient-specific head phantom were used to compare the calculated and measured doses...
2017: PloS One
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