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Implant passivity

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https://www.readbyqxmd.com/read/29782947/multifunctional-degradable-electronic-scaffolds-for-cardiac-tissue-engineering
#1
Ron Feiner, Sharon Fleischer, Assaf Shapira, Or Kalish, Tal Dvir
The capability to on-line sense tissue function, provide stimulation to control contractility and efficiently release drugs within an engineered tissue microenvironment may enhance tissue assembly and improve the therapeutic outcome of implanted engineered tissues. To endow cardiac patches with such capabilities we developed elastic, biodegradable, electronic scaffolds. The scaffolds were composed of electrospun albumin fibers that served as both a substrate and a passivation layer for evaporated gold electrodes...
May 18, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29775630/the-basolateral-amygdala-dopaminergic-system-contributes-to-the-improving-effect-of-nicotine-on-stress-induced-memory-impairment-in-rats
#2
Elnaz Keshavarzian, Zahra Ghasemzadeh, Ameneh Rezayof
Stress seems to be an important risk factor in the beginning and continuing stages of cigarette tobacco smoking in humans. Considering that both of nicotine administration and stress exposure affect cognitive functions including memory formation, the aim of the present study was 1) to evaluate the effect of subcutaneous (s.c.) administration of nicotine on memory formation under stress and 2) to assess the possible role of the basolateral amygdala (BLA) dopamine D1 and D2 receptors in the effect of nicotine on stress-induced memory retrieval impairment...
May 15, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29772033/passivity-of-fit-of-a-novel-prefabricated-implant-supported-mandibular-full-arch-reconstruction-a-comparative-in-vitro-study
#3
Matthias Karl, Roberto Carretta, Kenji W Higuchi
PURPOSE: To quantify the strain development of a new prefabricated implant-supported mandibular full-arch reconstruction. MATERIALS AND METHODS: Five resin models reflecting edentulous mandibles were each restored with three interforaminal implants and prefabricated frameworks with a novel compensation mechanism, cast frameworks, and computer-aided design/computer-assisted manufacturing (CAD/CAM)-fabricated frameworks. Strains were recorded during superstructure fixation...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29756600/the-development-of-neural-stimulators-a-review-of-preclinical-safety-and-efficacy-studies
#4
Robert K Shepherd, Joel Villalobos, Owen Burns, David Nayagam
OBJECTIVE: Given the rapid expansion of the field of neural stimulation and the rigorous regulatory approval requirements required before these devices can be applied clinically, it is important that there is clarity around conducting preclinical safety and efficacy studies required for the development of this technology. APPROACH: The present review examines basic design principles associated with the development of a safe neural stimulator and describes the suite of preclinical safety studies that need to be considered when taking a device to clinical trial...
May 14, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29744918/retrospective-analysis-of-rf-heating-measurements-of-passive-medical-implants
#5
Ting Song, Zhiheng Xu, Maria Ida Iacono, Leonardo M Angelone, Sunder Rajan
PURPOSE: The test reports for the RF-induced heating of metallic devices of hundreds of medical implants have been provided to the U.S. Food and Drug Administration as a part of premarket submissions. The main purpose of this study is to perform a retrospective analysis of the RF-induced heating data provided in the reports to analyze the trends and correlate them with implant geometric characteristics. METHODS: The ASTM-based RF heating test reports from 86 premarket U...
May 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29744469/recent-progress-on-biodegradable-materials-and-transient-electronics
#6
REVIEW
Rongfeng Li, Liu Wang, Deying Kong, Lan Yin
Transient electronics (or biodegradable electronics) is an emerging technology whose key characteristic is an ability to dissolve, resorb, or physically disappear in physiological environments in a controlled manner. Potential applications include eco-friendly sensors, temporary biomedical implants, and data-secure hardware. Biodegradable electronics built with water-soluble, biocompatible active and passive materials can provide multifunctional operations for diagnostic and therapeutic purposes, such as monitoring intracranial pressure, identifying neural networks, assisting wound healing process, etc...
September 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29740971/target-position-reproducibility-in-left-breast-irradiation-with-deep-inspiration-breath-hold-using-multiple-optical-surface-control-points
#7
Aurora Fassi, Giovanni B Ivaldi, Paola Tabarelli de Fatis, Marco Liotta, Ilaria Meaglia, Patrizia Porcu, Lea Regolo, Marco Riboldi, Guido Baroni
The aim of this study was to investigate the use of 3D optical localization of multiple surface control points for deep inspiration breath-hold (DIBH) guidance in left-breast radiotherapy treatments. Ten left-breast cancer patients underwent whole-breast DIBH radiotherapy controlled by the Real-time Position Management (RPM) system. The reproducibility of the tumor bed (i.e., target) was assessed by the position of implanted clips, acquired through in-room kV imaging. Six to eight passive fiducials were positioned on the patients' thoraco-abdominal surface and localized intrafractionally by means of an infrared 3D optical tracking system...
May 8, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29740728/transvenous-cardiac-implantable-electronic-device-implantation-in-patients-with-persistent-left-superior-vena-cava-in-a-tertiary-center
#8
Xueying Chen, Ziqing Yu, Jin Bai, Wei Wang, Shengmei Qin, Jingfeng Wang, Zhe Sun, Fei Han, Yangang Su, Junbo Ge
PURPOSE: Persistent left superior vena cava (PLSVC) is rare and often asymptomatic, which might cause difficulties in the implantation of cardiac implantable electronic devices (CIEDs). The aim of this study was to determine the prevalence of PLSVC and to study the clinical characteristics and significance of PLSVC in patients with CIED implantation. METHODS: Thirty-three patients with PLSVC were collected from 7047 CIED recipients over recent 10 years in our center...
May 9, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29728186/passive-sentence-comprehension-difficulties-and-its-related-factors-in-children-with-cochlear-implants
#9
Youngmee Lee, Jee Eun Sung, Hyunsub Sim
OBJECTIVES: The purposes of this study were to investigate which syntactic structures, from active and passive sentences, sensitively differentiate children with cochlear implants (CIs) from children with normal hearing (NH), to explore the correlations among working memory (WM) and other factors for each group, and to examine predictors of the active and passive sentence scores for both groups. METHODS: Twenty deaf children with CIs and 20 children with NH, aged 8-14 years, were included in this study...
June 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29721227/accuracy-of-fit-of-implant-supported-bars-fabricated-on-definitive-casts-made-by-different-dental-stones
#10
Ioannis Kioleoglou, Argirios Pissiotis, Michalakis Konstantinos
Background: The purpose of this study was to evaluate the accuracy of fitting of an implant supported screw-retained bar made on definitive casts produced by 4 different dental stone products. Material and Methods: The dental stones tested were QuickRock (Protechno), FujiRock (GC), Jade Stone (Whip Mix) and Moldasynt (Heraeus). Three external hexagon implants were placed in a polyoxymethylene block. Definitive impressions were made using monophase high viscosity polyvinylsiloxane in combination with custom trays...
March 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29699827/iatrogenic-bone-and-soft-tissue-trauma-in-robotic-arm-assisted-total-knee-arthroplasty-compared-with-conventional-jig-based-total-knee-arthroplasty-a-prospective-cohort-study-and-validation-of-a-new-classification-system
#11
Babar Kayani, Sujith Konan, Jurek R T Pietrzak, Fares S Haddad
BACKGROUND: The objective of this study was to compare macroscopic bone and soft tissue injury between robotic-arm assisted total knee arthroplasty (RA-TKA) and conventional jig-based total knee arthroplasty (CJ-TKA) and create a validated classification system for reporting iatrogenic bone and periarticular soft tissue injury after TKA. METHODS: This study included 30 consecutive CJ-TKAs followed by 30 consecutive RA-TKAs performed by a single surgeon. Intraoperative photographs of the femur, tibia, and periarticular soft tissues were taken before implantation of prostheses...
March 27, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29697055/local-schottky-contacts-of-embedded-ag-nanoparticles-in-al2o3-sinx-h-stacks-on-si-a-design-to-enhance-field-effect-passivation-of-si-junctions
#12
Omar Ibrahim Elmi, Odile Cristini-Robbe, Minyu Chen, Bin Wei, Rémy Bernard, Etienne Okada, Dmitri A Yarekha, Saliha Ouendi, Xavier Portier, Fabrice Gourbilleau, Tao Xu, Didier Stievenard
This paper describes an original design leading to the field effect passivation of Si n+-p junctions. Ordered Ag nanoparticle (Ag-NP) arrays with optimal size and coverage fabricated by means of nanosphere lithography and thermal evaporation, were embedded in ultrathin-Al2O3/SiNx:H stacks on the top of implanted Si n+-p junctions, to achieve effective surface passivation. One way to characterize surface passivation is to use photocurrent, sensitive to recombination centers. We evidenced an improvement of photocurrent by a factor of 5 with the presence of Ag nanoparticles...
April 26, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29691097/remote-monitoring-of-cardiac-implantable-electronic-devices
#13
Christopher C Cheung, Marc W Deyell
Over the past decade, technological advancements have transformed the delivery of care for arrhythmia patients. From early transtelephonic monitoring to new devices capable of wireless and cellular transmission, remote monitoring has revolutionized device care. In this article, we review the current evolution and evidence for remote monitoring in patients with cardiac implantable electronic devices. From passive transmission of device diagnostics, to active transmission of patient- and device-triggered alerts, remote monitoring can shorten the time to diagnosis and treatment...
January 8, 2018: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/29666009/in-vitro-validation-of-a-self-driving-aortic-turbine-venous-assist-device-for-fontan-patients
#14
Kerem Pekkan, Ibrahim Basar Aka, Ece Tutsak, Erhan Ermek, Haldun Balim, Ismail Lazoglu, Riza Turkoz
BACKGROUND: Palliative repair of single ventricle defects involve a series of open-heart surgeries where a single-ventricle (Fontan) circulation is established. As the patient ages, this paradoxical circulation gradually fails, because of its high venous pressure levels. Reversal of the Fontan paradox requires an extra subpulmonic energy that can be provided through mechanical assist devices. The objective of this study was to evaluate the hemodynamic performance of a totally implantable integrated aortic-turbine venous-assist (iATVA) system, which does not need an external drive power and maintains low venous pressure chronically, for the Fontan circulation...
March 11, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29664613/advanced-materials-and-devices-for-bioresorbable-electronics
#15
Seung-Kyun Kang, Jahyun Koo, Yoon Kyeung Lee, John A Rogers
Recent advances in materials chemistry establish the foundations for unusual classes of electronic systems, characterized by their ability to fully or partially dissolve, disintegrate, or otherwise physically or chemically decompose in a controlled fashion after some defined period of stable operation. Such types of "transient" technologies may enable consumer gadgets that minimize waste streams associated with disposal, implantable sensors that disappear harmlessly in the body, and hardware-secure platforms that prevent unwanted recovery of sensitive data...
April 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29625464/safety-studies-for-a-44-channel-suprachoroidal-retinal-prosthesis-a-chronic-passive-study
#16
Carla J Abbott, David A X Nayagam, Chi D Luu, Stephanie B Epp, Richard A Williams, Cesar M Salinas-LaRosa, Joel Villalobos, Ceara McGowan, Mohit N Shivdasani, Owen Burns, Jason Leavens, Jonathan Yeoh, Alice A Brandli, Patrick C Thien, Jenny Zhou, Helen Feng, Chris E Williams, Robert K Shepherd, Penelope J Allen
Purpose: Following successful clinical outcomes of the prototype suprachoroidal retinal prosthesis, Bionic Vision Australia has developed an upgraded 44-channel suprachoroidal retinal prosthesis to provide a wider field of view and more phosphenes. The aim was to evaluate the preclinical passive safety characteristics of the upgraded electrode array. Methods: Ten normal-sighted felines were unilaterally implanted with an array containing platinum electrodes (44 stimulating and 2 returns) on a silicone carrier near the area centralis...
March 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29618145/reliability-of-intraoperative-knee-range-of-motion-measurements-by-goniometer-compared-with-robot-assisted-arthroplasty
#17
Hyuck Min Kwon, Ick-Hwan Yang, Woo-Suk Lee, Alvin Ray L Yu, Sang Yun Oh, Kwan Kyu Park
Accurate measurement of knee range of motion (ROM) is critical to predict the outcomes of knee surgery and prognosis. We investigated the reliability of knee ROM measurements by goniometer compared with robotic system. Fifty-three patients with medial osteoarthritis who were planning to undergo unicompartmental knee arthroplasty (UKA) with robotic UKA were prospectively enrolled. During the operation, knee ROM measurement was performed in both flexion and extension before and after insertion of the implant using both a goniometer and robotic system...
April 4, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29605355/a-functional-and-anatomical-comparison-between-two-passive-transcutaneous-bone-conduction-implants-in-children
#18
Sara Giannantonio, Alessandro Scorpecci, Concettina Pacifico, Pasquale Marsella
OBJECTIVE: To compare anatomical and functional outcomes of two passive transcutaneous bone conduction implant systems: Sophono™ and BAHA Attract™. MATERIALS AND METHODS: Twenty patients, affected by bilateral conductive hearing loss, underwent unilateral transcutaneous bone conduction implant surgery. Ten children received a Sophono™ implant (6 males, 4 females, mean age 11 years, mean unaided Pure Tone Average (PTA) 0.25-4kHz = 69.70dB HL) and 10 a BAHA Attract™ system (7 males, 3 females, mean age 19 years, mean unaided PTA0...
May 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29603857/approaches-based-on-passive-and-active-antibacterial-coating-on-titanium-to-achieve-antibacterial-activity
#19
REVIEW
Sheng Qin, Kaihang Xu, Binen Nie, Fang Ji, Hao Zhang
Titanium (Ti) and its alloys are widely applied as orthopedic implants for hip and knee prosthesis, fixation, and dental implants. However, Ti and its alloys are bioinert and susceptible to bacteria and biofilm formation. Strategies for improving the antibacterial properties of Ti can be divided into two approaches, namely passive coating and active coating on the Ti surface. Passive coating on Ti mainly kills the bacteria in contact, but does not kill plankton or bacteria dwell in the bone tissue around the Ti implant...
March 31, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29602350/nonsurgical-correction-of-a-severe-anterior-open-bite-with-mandibular-molar-intrusion-using-mini-implants-and-the-multiloop-edgewise-archwire-technique
#20
Benedito Viana Freitas, Mayara Cristina Abas Frazão, Luana Dias, Pedro César Fernandes Dos Santos, Heloiza Viana Freitas, Jose A Bosio
This article reports the case of a 24-year-old man with a large anterior open bite, mild mandibular crowding, increased overjet, no passive lip sealing, and Angle Class I malocclusion. The treatment results were achieved by mandibular molar intrusion using 1.8 × 8.5-mm mini-implants (C-implants) inserted between the mandibular first and second molars bilaterally. A 2.5-mm molar intrusion and open-bite closure occurred within 8 months. The multiloop edgewise archwire technique helped to intrude the posterior teeth...
April 2018: American Journal of Orthodontics and Dentofacial Orthopedics
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