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https://www.readbyqxmd.com/read/28539002/from-in-vivo-to-in-vitro-the-medical-device-testing-paradigm-shift
#1
Dayna Kerecman Myers, Alan M Goldberg, Albrecht Poth, Michael F Wolf, Joseph Carraway, James McKim, Kelly P Coleman, Richard Hutchinson, Ronald Brown, Harald F Krug, Anthony Bahinski, Thomas Hartung
Amid growing efforts to advance the replacement, reduction, and refinement of the use of animals in research, there is a growing recognition that in vitro testing of medical devices can be more effective, both in terms of cost and time, and also more reliable than in vivo testing. Although the technological landscape has evolved rapidly in support of these concepts, regulatory acceptance of alternative testing methods has not kept pace. Despite the acceptance by regulators of some in vitro tests (cytotoxicity, gene toxicity, and some hemocompatibility assays), many toxicity tests still rely on animals (irritation, sensitization, acute toxicity, reproductive/developmental toxicity), even where other industrial sectors have already abandoned them...
May 25, 2017: ALTEX
https://www.readbyqxmd.com/read/28538806/development-of-a-new-model-of-actinic-enteritis-in-rats-using-a-cobalt-60-open-source-and-a-protection-device-as-a-collimator
#2
Vinicius Rodrigues Taranto Nunes, Paula Vieira Teixeira Vidigal, Márcio Tadeu Pereira, Luís Carlos Duarte Ladeira, Rafael Calvão Barbuto, Ivana Duval-Araujo
Purpose: To describe a new model of actinic enteritis that does not use radiotherapy machines. Methods: Sixteen Wistar rats were divided into four groups, consisting of four animals each: control (group A), two weeks after irradiation (group B), five weeks after irradiation (group C) and eight weeks after irradiation (group D). Animals were given a 10Gy radiation from a Cobalt-60 natural source in a nuclear technology research center. Protections of the surrounding tissues were obtained through the usage of plumb devices with a hole in the center, which served as a collimator...
April 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28538708/accuracy-in-wrist-worn-sensor-based-measurements-of-heart-rate-and-energy-expenditure-in-a-diverse-cohort
#3
Anna Shcherbina, C Mikael Mattsson, Daryl Waggott, Heidi Salisbury, Jeffrey W Christle, Trevor Hastie, Matthew T Wheeler, Euan A Ashley
The ability to measure physical activity through wrist-worn devices provides an opportunity for cardiovascular medicine. However, the accuracy of commercial devices is largely unknown. The aim of this work is to assess the accuracy of seven commercially available wrist-worn devices in estimating heart rate (HR) and energy expenditure (EE) and to propose a wearable sensor evaluation framework. We evaluated the Apple Watch, Basis Peak, Fitbit Surge, Microsoft Band, Mio Alpha 2, PulseOn, and Samsung Gear S2. Participants wore devices while being simultaneously assessed with continuous telemetry and indirect calorimetry while sitting, walking, running, and cycling...
May 24, 2017: Journal of Personalized Medicine
https://www.readbyqxmd.com/read/28538684/magnetic-nanoparticles-for-antibiotics-detection
#4
REVIEW
Cecilia Cristea, Mihaela Tertis, Ramona Galatus
Widespread use of antibiotics has led to pollution of waterways, potentially creating resistance among freshwater bacterial communities. Microorganisms resistant to commonly prescribed antibiotics (superbug) have dramatically increased over the last decades. The presence of antibiotics in waters, in food and beverages in both their un-metabolized and metabolized forms are of interest for humans. This is due to daily exposure in small quantities, that, when accumulated, could lead to development of drug resistance to antibiotics, or multiply the risk of allergic reaction...
May 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28538679/a-simple-drain-current-model-for-mos-transistors-with-the-lorentz-force-effect
#5
Hwang-Cherng Chow, Prasenjit Chatterjee, Wu-Shiung Feng
A novel concept of drain current modelling in rectangular normal MOS transistors with the Lorentz force has been proposed for the first time. The single-drain MOS transistor is qualified as a magnetic sensor. To create the Lorentz force, a DC loop current is applied through an on-chip metal loop around the device, and the relation between the applied loop current and the created magnetic field is assumed to be linear in nature. The drain current of the MOS transistor is reduced with the applied Lorentz force from both directions...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538654/a-monitoring-system-for-laying-hens-that-uses-a-detection-sensor-based-on-infrared-technology-and-image-pattern-recognition
#6
Mauro Zaninelli, Veronica Redaelli, Fabio Luzi, Valentino Bontempo, Vittorio Dell'Orto, Giovanni Savoini
In Italy, organic egg production farms use free-range housing systems with a big outdoor area and a flock of no more than 500 hens. With additional devices and/or farming procedures, the whole flock could be forced to stay in the outdoor area for a limited time of the day. As a consequence, ozone treatments of housing areas could be performed in order to reduce the levels of atmospheric ammonia and bacterial load without risks, due by its toxicity, both for hens and workers. However, an automatic monitoring system, and a sensor able to detect the presence of animals, would be necessary...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538653/development-of-diamond-and-silicon-mems-sensor-arrays-with-integrated-readout-for-vapor-detection
#7
Maira Possas-Abreu, Farbod Ghassemi, Lionel Rousseau, Emmanuel Scorsone, Emilie Descours, Gaelle Lissorgues
This paper reports on the development of an autonomous instrument based on an array of eight resonant microcantilevers for vapor detection. The fabricated sensors are label-free devices, allowing chemical and biological functionalization. In this work, sensors based on an array of silicon and synthetic diamond microcantilevers are sensitized with polymeric films for the detection of analytes. The main advantage of the proposed system is that sensors can be easily changed for another application or for cleaning since the developed gas cell presents removable electrical connections...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538624/comparison-of-compensatory-reserve-and-arterial-lactate-as-markers-of-shock-and-resuscitation
#8
Michael Johnson, Abdul Alarhayem, Victor Convertino, Robert Carter, Kevin Chung, Ronald Stewart, John Myers, Daniel Dent, Lilian Liao, Ramon Cestero, Susannah Nicholson, Mark Muir, Martin Schwaca, David Wampler, Mark DeRosa, Brian Eastridge
BACKGROUND: During traumatic hemorrhage, the ability to identify shock and intervene prior to decompensation is paramount to survival. Lactate is extremely sensitive to shock and its clearance has been demonstrated a useful gauge of shock and resuscitation status. Though lactate can be measured in the field, logistical constraints render it impractical in certain environments. The Compensatory Reserve represents a new clinical measurement reflecting the remaining capacity to compensate for hypoperfusion...
May 22, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28538613/acute-retinal-damage-after-using-a-toxic-perfluoro-octane-for-vitreo-retinal-surgery
#9
J Carlos Pastor, Rosa M Coco, Ivan Fernandez-Bueno, Maria L Alonso-Alonso, Jesús Medina, Aurelio Sanz-Arranz, Fernando Rull, Manuel J Gayoso, Antonio Dueñas, Maria T Garcia-Gutierrez, Lucia Gonzalez-Buendia, Santiago Delgado-Tirado, Emilio Abecia, Miguel Ruiz-Miguel, Miguel A Serrano, Jose M Ruiz-Moreno, Girish K Srivastava
PURPOSE: To describe a series of retinal acute toxicity cases with severe visual loss after intraocular use of a toxic perfluoro-octane (PFO). The clinical presentation is described, and the likely causes are analyzed. New biological methods for testing safety of intraocular medical devices are proposed. METHODS: Information regarding a series of eyes suffering acute severe events after intraocular use of a toxic PFO was analyzed. Four types of spectroscopy, nuclear magnetic resonance, and chromatography were used to identify the potential PFO contaminants...
June 2017: Retina
https://www.readbyqxmd.com/read/28538596/acute-and-hyper-acute-thoracolumbar-corpectomy-for-traumatic-burst-fractures-using-a-mini-open-lateral-approach
#10
William D Smith, Nick Ghazarian, Ginger Christian
STUDY DESIGN: Retrospective chart review. OBJECTIVE: The study purpose was to examine the feasibility of acute (<24 hours) and hyper-acute (<8 hours) treatment of thoracolumbar burst fractures to maintain or improve spinal injury scores. SUMMARY OF BACKGROUND DATA: Historically, treatment of spinal burst fractures within 24 hours from injury was considered an "acute" treatment timeframe. Patient polytrauma triage, multiple surgical specialty and hospital resource coordination affect time to treatment...
May 22, 2017: Spine
https://www.readbyqxmd.com/read/28538580/what-s-new-in-cleft-palate-and-velopharyngeal-dysfunction-management
#11
Sanjay Naran, Matthew Ford, Joseph E Losee
LEARNING OBJECTIVES: After studying this article, the participant should be able to: 1. Have a clear understanding of the evolution of concepts of velopharyngeal dysfunction, especially as it relates to patients with a cleft palate. 2. Explain the subjective and objective evaluation of speech in children with velopharyngeal dysfunction. 3. On the basis of these diagnostic findings, be able to classify types of velopharyngeal dysfunction. 4. Develop a safe, evidence-based, patient-customized treatment plan for velopharyngeal dysfunction founded on objective considerations...
June 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28538573/pursuing-mirror-image-reconstruction-in-unilateral-microtia-customizing-auricular-framework-by-application-of-three-dimensional-imaging-and-three-dimensional-printing
#12
Hsin-Yu Chen, Li-Shia Ng, Chun-Shin Chang, Ting-Chen Lu, Ning-Hung Chen, Zung-Chung Chen
BACKGROUND: Advances in three-dimensional imaging and three-dimensional printing technology have expanded the frontier of presurgical design for microtia reconstruction from two-dimensional curved lines to three-dimensional perspectives. This study presents an algorithm for combining three-dimensional surface imaging, computer-assisted design, and three-dimensional printing to create patient-specific auricular frameworks in unilateral microtia reconstruction. METHODS: Between January of 2015 and January of 2016, six patients with unilateral microtia were enrolled...
June 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28538561/is-rotation-a-concern-with-anatomical-breast-implants-a-statistical-analysis-of-factors-predisposing-to-rotation
#13
Paolo Montemurro, Athanasios Papas, Per Hedén
BACKGROUND: Since their introduction in 1993, anatomical implants have provided a more natural appearance in breast augmentation, and many surgeons advocate their use and promote the good aesthetic results. However, the risk of implant rotation makes some of them reluctant to use these devices. The rotation rate varies among authors. METHODS: The authors present a 6.5-year series of 531 patients who underwent primary breast augmentation with macrotextured anatomical implants in a Swedish facility performed by one consultant surgeon (P...
June 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28538495/committee-opinion-no-701-choosing-the-route-of-hysterectomy-for-benign-disease
#14
(no author information available yet)
Hysterectomy is one of the most frequently performed surgical procedures in the United States. Selection of the route of hysterectomy for benign causes can be influenced by the size and shape of the vagina and uterus; accessibility to the uterus; extent of extrauterine disease; the need for concurrent procedures; surgeon training and experience; average case volume; available hospital technology, devices, and support; whether the case is emergent or scheduled; and preference of the informed patient. Vaginal and laparoscopic procedures are considered "minimally invasive" surgical approaches because they do not require a large abdominal incision and, thus, typically are associated with shortened hospitalization and postoperative recovery times compared with open abdominal hysterectomy...
June 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28538491/committee-opinion-no-701-summary-choosing-the-route-of-hysterectomy-for-benign-disease
#15
(no author information available yet)
Hysterectomy is one of the most frequently performed surgical procedures in the United States. Selection of the route of hysterectomy for benign causes can be influenced by the size and shape of the vagina and uterus; accessibility to the uterus; extent of extrauterine disease; the need for concurrent procedures; surgeon training and experience; average case volume; available hospital technology, devices, and support; whether the case is emergent or scheduled; and preference of the informed patient. Vaginal and laparoscopic procedures are considered "minimally invasive" surgical approaches because they do not require a large abdominal incision and, thus, typically are associated with shortened hospitalization and postoperative recovery times compared with open abdominal hysterectomy...
June 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28538475/naproxen-sodium-for-pain-control-with-intrauterine-device-insertion-a-randomized-controlled-trial
#16
Mitchell D Creinin
No abstract text is available yet for this article.
June 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28538369/significant-reduction-of-fluoroscopy-repetition-with-lumbar-localization-system-in-minimally-invasive-spine-surgery-a-prospective-study
#17
Guoxin Fan, Hailong Zhang, Xin Gu, Chuanfeng Wang, Xiaofei Guan, Yunshan Fan, Shisheng He
The conventional location methods for minimally invasive spinal surgery (MISS) were mainly based on repeated fluoroscopy in a trial-and-error manner preoperatively and intraoperatively. Localization system mainly consisted of preoperative applied radiopaque frame and intraoperative guiding device, which has the potential to minimize fluoroscopy repetition in MISS. The study aimed to evaluate the efficacy of a novel lumbar localization system in reducing radiation exposure to patients.Included patients underwent minimally invasive transforaminal lumbar interbody fusion (MISTLIF) or percutaneous transforaminal endoscopic discectomy (PTED)...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28538336/impact-of-dry-eye-symptoms-and-daily-activities-in-a-modern-office
#18
Mirjam M van Tilborg, Paul J Murphy, Katharine S Evans
PURPOSE: Modern offices and the use of electronic devices are increasing factors in work-related eye symptoms. However, symptoms of eye fatigue or dry eye sensation can be mixed and confusing. This study surveys the eye symptoms reported during a working day at modern offices to investigate the possible inhibition on daily work activities. METHODS: Two online digital surveys were sent to three different work locations, by direct e-mail. Survey A consisted of 14 questions that investigated eye symptoms experienced during daily activities at work and the impact on daily activities...
June 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28538317/effects-of-inertial-setting-on-power-force-work-and-eccentric-overload-during-flywheel-resistance-exercise-in-women-and-men
#19
Luis M Martinez-Aranda, Rodrigo Fernandez-Gonzalo
Martinez-Aranda, LM and Fernandez-Gonzalo, R. Effects of inertial setting on power, force, work and eccentric overload during flywheel resistance exercise in women and men. J Strength Cond Res 31(6): 1653-1661, 2017-Exercise load is a key component in determining end-point adaptations to resistance exercise. Yet, there is no information regarding the use of different inertia (i.e., loads) during isoinertial flywheel resistance exercise, a very popular high-intensity training model. Thus, this study examined power, work, force, and eccentric overload produced during flywheel resistance exercise with different inertial settings in men and women...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28538302/physiological-demands-of-elite-cross-country-skiing-during-a-real-competition
#20
Cristina Gonzalez-Millan, Dario Perez-Brunicardi, Juan J Salinero, Beatriz Lara, Javier Abián-Vicen, Francisco Areces, Diana Ruiz-Vicente, Lidon Soriano, Juan Del Coso
Gonzalez-Millan, C, Perez-Brunicardi, D, Salinero, JJ, Lara, B, Abián-Vicen, J, Areces, F, Ruiz-Vicente, D, Soriano, L, and Del Coso, J. Physiological demands of elite cross-country skiing during a real competition. J Strength Cond Res 31(6): 1536-1543, 2017-The aim of this study was to assess different physiological variables before and after a 5-km (women) and 10-km (men) cross-country skiing competition to determine potential mechanisms of fatigue. Fourteen elite-level skiers competed in an official cross-country skiing competition using the classical style (9 men and 5 women)...
June 2017: Journal of Strength and Conditioning Research
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