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https://www.readbyqxmd.com/read/28108975/3d-printed-soft-tissue-physical-models-of-renal-malignancies-for-individualized-surgical-simulation-a-feasibility-study
#1
Michael M Maddox, Allison Feibus, James Liu, Julie Wang, Raju Thomas, Jonathan L Silberstein
To construct patient-specific physical three-dimensional (3D) models of renal units with materials that approximates the properties of renal tissue to allow pre-operative and robotic training surgical simulation, 3D physical kidney models were created (3DSystems, Rock Hill, SC) using computerized tomography to segment structures of interest (parenchyma, vasculature, collection system, and tumor). Images were converted to a 3D surface mesh file for fabrication using a multi-jet 3D printer. A novel construction technique was employed to approximate normal renal tissue texture, printers selectively deposited photopolymer material forming the outer shell of the kidney, and subsequently, an agarose gel solution was injected into the inner cavity recreating the spongier renal parenchyma...
January 20, 2017: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/28107832/a-simple-method-to-produce-2d-and-3d-microfluidic-paper-based-analytical-devices-for-clinical-analysis
#2
Ricardo A G de Oliveira, Fiamma Camargo, Naira C Pesquero, Ronaldo Censi Faria
This paper describes the fabrication of 2D and 3D microfluidic paper-based analytical devices (μPADs) for monitoring glucose, total protein, and nitrite in blood serum and artificial urine. A new method of cutting and sealing filter paper to construct μPADs was demonstrated. Using an inexpensive home cutter printer soft cellulose-based filter paper was easily and precisely cut to produce pattern hydrophilic microchannels. 2D and 3D μPADs were designed with three detection zones each for the colorimetric detection of the analytes...
March 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28103751/3d-bioprinting-towards-the-era-of-manufacturing-human-organs-as-spare-parts-for-healthcare-and-medicine
#3
Tanveer Ahmad Mir, Makoto Nakamura
3D printing technology has been used in industrial worlds for decades. 3D bioprinting has recently received an increasing attention across the globe among researchers, academicians, students and even the ordinary people. This emerging technique has a great potential to engineer highly organized functional bioconstructs with complex geometries and tailored components for engineering bio-artificial tissues/organs for widespread applications, including transplantation, therapeutic investigation, drug development, bioassay and disease modelling...
January 19, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28099494/a-3d-printed-toolbox-for-opto-mechanical-components
#4
Luis José Salazar-Serrano, Juan P Torres, Alejandra Valencia
In this article we present the development of a set of opto-mechanical components (a kinematic mount, a translation stage and an integrating sphere) that can be easily built using a 3D printer based on Fused Filament Fabrication (FFF) and parts that can be found in any hardware store. Here we provide a brief description of the 3D models used and some details on the fabrication process. Moreover, with the help of three simple experimental setups, we evaluate the performance of the opto-mechanical components developed by doing a quantitative comparison with its commercial counterparts...
2017: PloS One
https://www.readbyqxmd.com/read/28096747/implementing-a-3d-printing-service-in-a-biomedical-library
#5
Verma Walker
Three-dimensional (3D) printing is opening new opportunities in biomedicine by enabling creative problem solving, faster prototyping of ideas, advances in tissue engineering, and customized patient solutions. The National Institutes of Health (NIH) Library purchased a Makerbot Replicator 2 3D printer to give scientists a chance to try out this technology. To launch the service, the library offered training, conducted a survey on service model preferences, and tracked usage and class attendance. 3D printing was very popular, with new lab equipment prototypes being the most common model type...
January 2017: Journal of the Medical Library Association: JMLA
https://www.readbyqxmd.com/read/28094916/3d-printing-of-carbon-nanotubes-based-microsupercapacitors
#6
Wei Yu, Han Zhou, Ben Q Li, Shujiang Ding
A novel 3D printing procedure is presented for fabrication of carbon nanotubes-based microsupercapacitors. The 3D printer uses CNTs ink slurry with moderate solid content and prints continuous droplets. Appropriate control of a heated base is applied to facilitate the solvent removal and adhesion among printed features and to improve the structure integrity without delamination or distortion upon drying. The printed electrodes for microsupercapacitors are characterized by SEM, a laser scanning confocal microscope and a step profiler...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094392/3d-printing-of-self-assembling-thermoresponsive-nanoemulsions-into-hierarchical-mesostructured-hydrogels
#7
Lilian C Hsiao, Abu Zayed Md Badruddoza, Li-Chiun Cheng, Patrick S Doyle
Spinodal decomposition and phase transitions have emerged as viable methods to generate a variety of bicontinuous materials. Here, we show that when arrested phase separation is coupled to the time scales involved in three-dimensional (3D) printing processes, hydrogels with multiple length scales spanning nanometers to millimeters can be printed with high fidelity. We use an oil-in-water nanoemulsion-based ink with rheological and photoreactive properties that satisfy the requirements of stereolithographic 3D printing...
January 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28094152/use-of-3d-printer-technology-to-facilitate-surgical-correction-of-a-complex-vascular-anomaly-with-esophageal-entrapment-in-a-dog
#8
A Dundie, G Hayes, P Scrivani, L Campoy, D Fletcher, K Ash, E Oxford, N S Moïse
A 10 week old female intact Staffordshire terrier was presented with a total of five congenital cardio-thoracic vascular anomalies consisting of a patent ductus arteriosus (PDA) with an aneurysmic dilation, pulmonic stenosis, persistent right aortic arch, aberrant left subclavian artery and persistent left cranial vena cava. These abnormalities were identified with a combination of echocardiogram and computed tomography angiography (CTA). The abnormalities were associated with esophageal entrapment, regurgitation, and volume overload of the left heart with left atrial and ventricular enlargement...
January 13, 2017: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/28089333/fit-of-interim-crowns-fabricated-using-photopolymer-jetting-3d%C3%A2-printing
#9
Hang-Nga Mai, Kyu-Bok Lee, Du-Hyeong Lee
STATEMENT OF PROBLEM: The fit of interim crowns fabricated using 3-dimensional (3D) printing is unknown. PURPOSE: The purpose of this in vitro study was to evaluate the fit of interim crowns fabricated using photopolymer-jetting 3D printing and to compare it with that of milling and compression molding methods. MATERIAL AND METHODS: Twelve study models were fabricated by making an impression of a metal master model of the mandibular first molar...
January 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28054558/development-of-the-improving-process-for-the-3d-printed-structure
#10
Kensuke Takagishi, Shinjiro Umezu
The authors focus on the Fused Deposition Modeling (FDM) 3D printer because the FDM 3D printer can print the utility resin material. It can print with low cost and therefore it is the most suitable for home 3D printer. The FDM 3D printer has the problem that it produces layer grooves on the surface of the 3D printed structure. Therefore the authors developed the 3D-Chemical Melting Finishing (3D-CMF) for removing layer grooves. In this method, a pen-style device is filled with a chemical able to dissolve the materials used for building 3D printed structures...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28048775/mo-fg-campus-tep1-04-pseudo-in-vivo-dose-verification-of-a-new-mono-isocentric-technique-for-the-treatment-of-multiple-brain-metastases
#11
E P Pappas, N Papanikolaou, G Kalaitzakis, T Boursianis, D Makris, V Lahanas, I Genitsarios, S Stathakis, L Watts, T Maris, E Pappas
PURPOSE: To validate dose calculation and delivery accuracy of a recently introduced mono-isocentric technique for the treatment of multiple brain metastases in a realistic clinical case. METHODS: Anonymized CT scans of a patient were used to model a hollow phantom that duplicates anatomy of the skull. A 3D printer was used to construct the phantom of a radiologically bone-equivalent material. The hollow phantom was subsequently filled with a polymer gel 3D dosimeter which also acted as a water-equivalent material...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048723/su-f-t-181-proton-therapy-tissue-equivalence-of-3d-printed-materials
#12
P Taylor, D Craft, D Followill, R Howell
PURPOSE: This work investigated the proton tissue-equivalence of various 3D printed materials. METHODS: Three 3D printers were used to create 5 cm cubic phantoms made of different plastics with varying percentages of infill. White resin, polylactic acid (PLA), and NinjaFlex plastics were used. The infills ranged from 15% to 100%. Each phantom was scanned with a CT scanner to obtain the HU value. The relative linear stopping power (RLSP) was then determined using a multi-layer ion chamber in a 200 MeV proton beam...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048702/tu-h-brc-01-a-new-fabrication-method-for-secondary-skin-collimation-using-3d-scanner-and-3d-printer
#13
J Jung, N Potter, T Suh, C Liu, B Lu
PURPOSE: Using secondary skin collimation (SSC) to protect the critical organ surrounding the tumors is always desirable for electron and/or ortho-voltage treatments. However, the time-consuming and labor-intensive fabrication processes of current method (manually fabricate the lead mask) restrict the general use of SSC. The aim of this study is to develop a new SSC fabrication method using 3D scanning and 3D printing technologies in order to largely decrease the human labor involvement and fabrication time, also improve the fabrication accuracy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048577/tu-h-campus-iep2-05-breast-and-soft-tissue-equivalent-3d-printed-phantoms-for-imaging-and-dosimetry
#14
D Hintenlang, B Terracino
PURPOSE: The study has the goal to demonstrate that breast and soft tissue-equivalent phantoms for dosimetry applications in the diagnostic energy range can be fabricated using common 3D printing methods. METHODS: 3D printing provides the opportunity to rapidly prototype uniquely designed objects from a variety of materials. Common 3D printers are usually limited to printing objects based on thermoplastic materials such as PLA, or ABS. The most commonly available plastic is PLA, which has a density significantly greater than soft tissue...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048437/su-f-t-580-new-tumor-modeling-using-3d-gel-dosimeter-for-brain-stereoctactic-radiotherpy-srt
#15
K Chang, M Kim, J Kwak, S Kim, Y Ji, B Cho, S Yoon, S Lee
PURPOSE: The purpose of this study is to develop new tumor model using 3D printing with 3D dosimeter for brain stereoctactic radiotherpy (SRT). METHODS: BANG(3) polymer gel was prepared and the gel-filled glass vials were irradiated with a 6 MV photon beam to acquire the calibration curve that present the change of R2 (1/T2 ) value with dose. Graded doses from 0 to 12 Gy with an interval of 2 Gy were delivered. A kit for calibration of gel dosimeter and an 2 tumor model phantoms with a spherical shape were produced using a 3D printer with a polylactic acid after its 3D images were created using Autodesk software...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048045/su-f-t-171-manufacturing-cost-effective-heterogeneous-phantoms-for-use-in-proton-therapy
#16
J Pruett, Y Chen, S Ahmad, D Johnson
PURPOSE: To study the feasibility of 3D printing cost effective heterogeneous phantoms for use in proton therapy treatment planning quality assurance. METHODS: A desktop 3D printer was utilized to create a series of 2 cm × 2 cm × 4 cm PLA plastic blocks of varying fill materials and hexagonal fill pattern. The blocks were than tested when filled with air, polyurethane foam, paraffin, silicone, and caulk of calcium carbonate - acrylic polymer blend. The blocks were evaluated with a "GE Lightspeed" 16 slice CT scanner and average CT# of the materials' centers evaluated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047951/tu-h-campus-tep1-04-novel-3d-printed-plastic-cutouts-filled-with-aluminum-oxide-for-same-day-electron-radiotherapy
#17
J Mikell, C Lee, K Lam
PURPOSE: Clinics that outsource electron cutout manufacturing may be unable to simulate and treat patients on the same day. To enable same day treatment, we investigate the use of 3D printed hollow cutouts filled with 30 grit Al2 O3 powder. We verified the dosimetric equivalence of such a cutout relative to an outsourced Copper cutout. METHODS: Printing was performed using a Ultibots Kossel 250 V-Slot 3D printer and polylactic acid filament. Printing files were derived from an in-house 3D model designed to mate with a Varian 6 cm electron cone...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047856/su-f-t-500-the-effectiveness-of-a-patient-specific-bolus-made-by-using-three-dimensional-printing-technique-in-photon-radiotherapy
#18
K Fujimoto, T Shiinoki, Y Yuasa, H Hanazawa, K Shibuya
PURPOSE: A commercially available bolus (commercial-bolus) would not completely contact with the irregular shape of a patient's skin. The purposes of this study were to customize a patient specific three-dimensional (3D) bolus using a 3D printer (3D-bolus) and to evaluate its clinical feasibility for photon radiotherapy. METHODS: The 3D-bolus was designed using a treatment planning system (TPS) in DICOM-RT format. To print the 3D bolus, the file was converted into stereolithography format...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047657/su-f-j-140-using-handheld-stereo-depth-cameras-to-extend-medical-imaging-for-radiation-therapy-planning
#19
C Jenkins, L Xing, S Yu
PURPOSE: A correct body contour is essential for the accuracy of dose calculation in radiation therapy. While modern medical imaging technologies provide highly accurate representations of body contours, there are times when a patient's anatomy cannot be fully captured or there is a lack of easy access to CT/MRI scanning. Recently, handheld cameras have emerged that are capable of performing three dimensional (3D) scans of patient surface anatomy. By combining 3D camera and medical imaging data, the patient's surface contour can be fully captured...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047544/su-f-j-176-development-of-a-patient-specific-3d-couplant-pad-for-ultrasound-igrt
#20
H Kim, A Chang, S Ye
PURPOSE: to overcome the several issues of ultrasound image-guided radiation therapy (US IGRT) such as probe pressure and optical tracking disability by using a patient-specific three-dimensional couplant pad (CP) fabricated by a patient's skin mold using a 3D printing technique. METHODS: A CP was then fabricated by pouring gelatin solution into a fixed-shape container accommodating the patient skin mold fabricated by a 3D printer. A breast phantom was fabricated with the compound of gelatin and agarose and a phantom study was carried out...
June 2016: Medical Physics
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