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Implant passivity

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https://www.readbyqxmd.com/read/28106696/use-of-acellular-dermal-matrix-in-treatment-of-congenital-muscular-torticollis-in-patients-over-eight-years-of-age
#1
Hyung Min Hahn, Kyung Hoon Cook, Il Jae Lee, Dong Ha Park, Myong Chul Park
BACKGROUND: Treatment for neglected or recurred congenital muscular torticollis should be differentiated from primary patients due to the long-standing adjacent tissue contracture. The aim of this study was to evaluate the effect of acellular dermal matrix (ADM) on surgery of recurred and neglected patients of congenital muscular torticollis. METHODS: Forty-nine patients were included in the study. All patients underwent resection at the distal end of the sternocleidomastoid muscle...
January 18, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28095914/vascular-mapping-of-the-retroauricular-skin-proposal-for-a-posterior-superior-surgical-incision-for-transcutaneous-bone-conduction-hearing-implants
#2
Adam Perenyi, Zsofia Bere, Janos Jarabin, Balazs Sztano, Edit Kukla, Ziad Bikhazi, Laszlo Tiszlavicz, Ferenc Toth, Jozsef Geza Kiss, Laszlo Rovo
BACKGROUND: Passive transcutaneous osseointegrated hearing implant systems have become increasingly popular more recently. The area over the implant is vulnerable due to vibration and pressure from the externally worn sound processor. Good perfusion and neural integrity has the potential to reduce complications. The authors' objective was to determine the ideal surgical exposure to maintain perfusion and neural integrity and decrease surgical time as a result of reduced bleeding. METHODS: The vascular anatomy of the temporal-parietal soft tissue was examined in a total of 50 subjects...
January 17, 2017: Journal of Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28078394/kinematics-of-a-bicruciate-retaining-total-knee-arthroplasty
#3
Thomas J Heyse, Joshua Slane, Geert Peersman, Margo Dirckx, Arne van de Vyver, Philipp Dworschak, Susanne Fuchs-Winkelmann, Lennart Scheys
PURPOSE: The recently reintroduced bicruciate-retaining Total Knee Arthroplasty (BCR TKA) is an interesting approach in the quest for close replication of knee joint biomechanics and kinematics closer to the native knee. Therefore, this study aimed at providing a detailed biomechanical view on the functional resemblance of BCR TKA to the native knee joint. METHODS: Seven fresh-frozen full leg cadaver specimens (76 ± 10 year) were mounted in a 6 degrees-of-freedom kinematic rig that applied a dynamic squatting motion knee flexion...
January 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28064219/active-and-passive-immunization-against-staphylococcus-aureus-periprosthetic-osteomyelitis-in-rats
#4
Niels H Søe, Nina Vendel Jensen, Asger Lundorff Jensen, Janne Koch, Steen Seier Poulsen, Gerald B Pier, Helle Krogh Johansen
BACKGROUND/AIM: Staphylococcus aureus infection associated with orthopedic implants cannot always be controlled. We used a knee prosthesis model with implant-related osteomyelitis in rats to explore induction of an effective immune response with active and passive immunization. MATERIALS AND METHODS: Fifty-two Sprague-Dawley rats were divided into active (N=28) and passive immunization groups (N=24). A bacterial inoculum of 10(3) S. aureus MN8 was injected into the tibia and the femur marrow before insertion of a non-constrained knee prosthesis in each rat...
January 2017: In Vivo
https://www.readbyqxmd.com/read/28031691/cardiac-tamponade-after-right-ventricular-perforation-caused-by-screw-in-lead
#5
Lovel Giunio, Teo Boric, Cristijan Bulat, Dragan Dragicevic, Mislav Lozo
A 69-year-old man was admitted after syncope followed with chest pain and signs of cardiac tamponade. He had undergone permanent dual-chamber pacemaker implantation 3 weeks earlier. Transthoracic echocardiography (TTE) confirmed a pericardial effusion, and urgent pericardial drainage was performed. Right ventricular perforation caused by active-fixation (screw-in) lead was verified by multislice computed tomography. The lead was extracted under fluoroscopy and bedside TTE monitoring in the operating room with cardiothoracic surgery backup...
December 2016: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28029613/a-mems-condenser-microphone-based-intracochlear-acoustic-receiver
#6
Flurin Pfiffner, Lukas Prochazka, Dominik Peus, Ivo Dobrev, Adrian Dalbert, Jae Hoon Sim, Rahel Kesterke, Joris Walraevens, Francesca Paris, Christof Roosli, Dominik Obrist, A M Huber
GOAL: Intracochlear sound pressure (ICSP) measurements are limited by the small dimensions of the human inner ear and the requirements imposed by the liquid medium. A robust intracochlear acoustic receiver (ICAR) for repeated use with a simple data acquisition system that provides the required high sensitivity and small dimensions does not yet exist. The work described in this report aims to fill this gap and presents a new MEMS condenser microphone (CMIC) based ICAR concept suitable for ICSP measurements in human temporal bones...
December 16, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28024820/simplified-fabrication-of-an-implant-supported-framework-with-luted-abutment-cylinders
#7
Lambert J Stumpel
A technique is described to generate a framework for an implant-supported fixed complete denture. The main advantage of the described technique is the low production cost of a framework that has high strength, passive fit, and distinct retentive structures for each denture tooth.
December 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28024610/alkalescent-nanotube-films-on-a-titanium-based-implant-a-novel-approach-to-enhance-biocompatibility
#8
Yanxian Zhang, Chaofang Dong, Sefei Yang, Junsheng Wu, Kui Xiao, Yunhua Huang, Xiaogang Li
The interfacial pH value has a marked effect on cell viability because the pro-mineralization activity of osteoblasts increases at alkaline extracellular pH, whereas the pro-resorptive activity of osteoclasts increases under more acidic conditions. To obtain the more favorable alkaline interface, we developed a novel nanotube layer that was incorporated with magnesium oxide on a titanium implant substrate (MgO/NT/Ti) via ethylenediamine tetraacetic acid (EDTA) chelation. This facile immersion-annealing process successfully created a homogeneous magnesium oxide layer with sustained release kinetics and superior hydrophilicity according to the surface characterization and microenvironment measurement...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28008765/a-comparative-analysis-of-the-effectiveness-of-active-versus-passive-atrial-lead-fixation-in-chinese-patients-with-cardiac-implantable-electrical-devices-a-long-term-retrospective-observational-single-center-study
#9
Yinglu Hao, Yanping Li, Derong Liao, Ling Yang, Fangyan Liu
BACKGROUND: Data comparing active atrial lead fixation with passive atrial lead fixation in Chinese patients with cardiovascular implantable electronic devices (CIEDs) for atrial pacing is limited. Our study evaluated the effectiveness of active fixation versus passive-fixation of atrial leads by observing the lead performance parameters. METHODS: This retrospective, long-term, single-center study included a cohort of Chinese patients who underwent CIED implantation at the Department of Cardiology of People's Hospital of Yuxi City, China, from 1(st) March 2010 to 1(st) March 2015...
December 23, 2016: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/27999392/smart-pipe-system-for-a-shipyard-4-0
#10
Paula Fraga-Lamas, Diego Noceda-Davila, Tiago M Fernández-Caramés, Manuel A Díaz-Bouza, Miguel Vilar-Montesinos
As a result of the progressive implantation of the Industry 4.0 paradigm, many industries are experimenting a revolution that shipyards cannot ignore. Therefore, the application of the principles of Industry 4.0 to shipyards are leading to the creation of Shipyards 4.0. Due to this, Navantia, one of the 10 largest shipbuilders in the world, is updating its whole inner workings to keep up with the near-future challenges that a Shipyard 4.0 will have to face. Such challenges can be divided into three groups: the vertical integration of production systems, the horizontal integration of a new generation of value creation networks, and the re-engineering of the entire production chain, making changes that affect the entire life cycle of each piece of a ship...
December 20, 2016: Sensors
https://www.readbyqxmd.com/read/27987778/the-role-of-grain-refinement-and-film-formation-potential-on-the-electrochemical-behavior-of-commercial-pure-titanium-in-hank-s-physiological-solution
#11
Arash Fattah-Alhosseini, Omid Imantalab, Ghazaleh Ansari
In this study, the electrochemical behavior and semiconducting properties of the passive film formed on the nano-grained commercial pure titanium (CP-Ti), successfully made by seven-cycle accumulative roll bonding process, were compared to those for annealed CP-Ti in Hank's physiological solution at 37°C. Polarization plots and electrochemical impedance spectroscopy measurements revealed that the passive behavior of the nano-grained sample was significantly improved in comparison with that of annealed CP-Ti...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987772/effect-of-immersion-time-on-the-passive-and-electrochemical-response-of-annealed-and-nano-grained-commercial-pure-titanium-in-ringer-s-physiological-solution-at-37%C3%A2-c
#12
Arash Fattah-Alhosseini, Ali Reza Ansari, Yousef Mazaheri, Mohsen K Keshavarz
In the present study, various electrochemical tests were used to investigate the passive and electrochemical response of annealed and nano-grained commercial pure Titanium in Ringer's physiological solution at 37°C. Nano-grained pure Titanium, which typically has an average grain size of 90±5nm, was obtained by six-cycle accumulative roll bonding process. Polarization and electrochemical impedance spectroscopy plots illustrated that as a result of grain refinement process, the passive response of the nano-grained sample was improved compared to that of its coarse-grained counterpart in Ringer's physiological solution...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987714/microstructure-surface-characterization-and-long-term-stability-of-new-quaternary-ti-zr-ta-ag-alloy-for-implant-use
#13
C Vasilescu, P Osiceanu, J M Calderon Moreno, S I Drob, S Preda, M Popa, I Dan, M Marcu, M Prodana, I A Popovici, D Ionita, E Vasilescu
The novel Ti-20Zr-5Ta-2Ag alloy was characterised concerning its microstructure, morphology, mechanical properties, its passive film composition and thickness, its long-term electrochemical stability, corrosion resistance, ion release rate in Ringer solution of acid, neutral and alkaline pH values and antibacterial activity. The new alloy has a crystalline α microstructure (by XRD). Long-term XPS and SEM analyses show the thickening of the passive film and the deposition of hydroxyapatite in neutral and alkaline Ringer solution...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987680/mediating-bone-regeneration-by-means-of-drug-eluting-implants-from-passive-to-smart-strategies
#14
REVIEW
Sara Bagherifard
In addition to excellent biocompatibility and mechanical performance, the new generation of bone and craniofacial implants are expected to proactively contribute to the regeneration process and dynamically interact with the host tissue. To this end, integration and sustained delivery of therapeutic agents has become a rapidly expanding area. The incorporated active molecules can offer supplementary features including promoting oteoconduction and angiogenesis, impeding bacterial infection and modulating host body reaction...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987300/implantable-sensors-for-regenerative-medicine
#15
Brett S Klosterhoff, Melissa Tsang, Didi She, Keat Ghee Ong, Mark G Allen, Nick J Willett, Robert E Guldberg
The translation of many tissue engineering/regenerative medicine (TE/RM) therapies that demonstrate promise in vitro are delayed or abandoned due to reduced and inconsistent efficacy when implemented in more complex and clinically relevant preclinical in vivo models. Determining mechanistic reasons for impaired treatment efficacy is challenging after a regenerative therapy is implanted due to technical limitations in longitudinally measuring the progression of key environmental cues in vivo. The ability to acquire real-time measurements of environmental parameters of interest including strain, pressure, pH, temperature, oxygen tension, and specific biomarkers within the regenerative niche in situ would significantly enhance the information available to tissue engineers to monitor and evaluate mechanisms of functional healing or lack thereof...
February 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27982769/a-novel-assistive-method-for-rigidity-evaluation-during-deep-brain-stimulation-surgery-using-acceleration-sensors
#16
Ashesh Shah, Jérôme Coste, Jean-Jacques Lemaire, Erik Schkommodau, Ethan Taub, Raphael Guzman, Philippe Derost, Simone Hemm
OBJECTIVE Despite the widespread use of deep brain stimulation (DBS) for movement disorders such as Parkinson's disease (PD), the exact anatomical target responsible for the therapeutic effect is still a subject of research. Intraoperative stimulation tests by experts consist of performing passive movements of the patient's arm or wrist while the amplitude of the stimulation current is increased. At each position, the amplitude that best alleviates rigidity is identified. Intrarater and interrater variations due to the subjective and semiquantitative nature of such evaluations have been reported...
December 16, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27982188/tensile-strength-of-resin-cements-used-with-base-metals-in-a-simulating-passive-cementation-technique-for-implant-supported-prostheses
#17
Hilmo Barreto Leite Falcão, Ricardo Faria Ribeiro, Raphael Freitas de Souza, Ana Paula Macedo, Rossana Pereira de Almeida
The aim of this study was to analyze the tensile strength of two different resin cements used in passive cementation technique for implant-supported prosthesis. Ninety-six plastic cylinders were waxed in standardized forms, cast in commercially pure titanium, nickel-chromium and nickel-chromium-titanium alloys. Specimens were cemented on titanium cylinders using self-adhesive resin cement or conventional dual-cured resin cement. Specimens were divided in 12 groups (n=8) in accordance to metal, cement and ageing process...
October 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27980243/analysis-of-serum-cholesterol-efflux-capacity-in-a-minipig-model-of-nonischemic-heart-failure
#18
Federico Bigazzi, Maria Pia Adorni, Mariarita Puntoni, Francesco Sbrana, Vincenzo Lionetti, Beatrice Dal Pino, Elda Favari, Fabio A Recchia, Franco Bernini, Tiziana Sampietro
AIM: Circulating levels of high-density lipoprotein cholesterol (HDL-C) are decreased in patients with heart failure (HF). We tested whether HDL-C serum levels are associated with cardiac contractile dysfunction in a minipig HF model. METHODS: Blood samples were collected from 13 adult male minipigs: 1) before pacemaker implantation, 2) 10 days after surgery, and 3) 3 weeks after high-rate LV pacing. Serum cholesterol efflux capacity (CEC), an index of HDL functionality, was assessed through four mechanisms: ATP Binding Cassette transporter A1 (ABCA1), ATP Binding Cassette transporter G1 (ABCG1), Scavenger Receptor-Class B Type I (SR-BI) and Passive Diffusion (PD)...
December 15, 2016: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/27958428/barrier-layer-induced-channeling-effect-of-as-ion-implantation-in-hgcdte-and-its-influences-on-electrical-properties-of-p-n-junctions
#19
Changzhi Shi, Chun Lin, Yanfeng Wei, Lu Chen, Mingxing Zhu
The HgCdTe layers (x<sub>Cd</sub>∼0.285 and 0.225) were grown by molecular beam epitaxy and liquid phase epitaxy, respectively, followed by the deposition of CdTe and ZnS films as barrier layers by thermal evaporation. Then, the p-on-n photodiodes were fabricated by AS ion implantation, Hg overpressure annealing, passivation, and metallization. The secondary ion mass spectrometry and transmission electron microscopy results indicate that the evaporated CdTe layer with a column structure induces the channeling effect of As ion implantation causing the device performance degradation...
December 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27943597/re-endothelialization-of-rat-lung-scaffolds-through-passive-gravity-driven-seeding-of-segment-specific-pulmonary-endothelial-cells
#20
Michelle E Scarritt, Nicholas C Pashos, Jessica M Motherwell, Zachary R Eagle, Brian J Burkett, Ashley N Gregory, Ricardo Mostany, Daniel J Weiss, Diego F Alvarez, Bruce A Bunnell
Effective re-endothelialization is critical for the use of decellularized scaffolds for ex vivo lung engineering. Current approaches yield insufficiently re-endothelialized scaffolds that hemorrhage and become thrombogenic upon implantation. Herein, gravity-driven seeding coupled with bioreactor culture facilitated widespread distribution and engraftment of endothelial cells throughout rat lung scaffolds. Initially, human umbilical vein endothelial cells (HUVECs) were seeded into the pulmonary artery by either gravity-driven, variable flow perfusion seeding or pump-driven, pulsatile flow perfusion seeding...
December 12, 2016: Journal of Tissue Engineering and Regenerative Medicine
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