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Maleki T T School of Electrical and Computer Engineering at Purdue University, West Lafayette, IN 47907, - - 2010
In this paper, we present several implantable micro-devices targeted towards improving the efficacy of radiation therapy. Three micro-devices are discussed: a self-biased solid state dosimeter to be used for wireless monitoring of the delivered dose, an electromagnetic tracking system to locate the position of tumor in real-time, and a Guyton-chamber-embedded ...
Alves C E CE Biomedical Instrumentation Laboratory, State University of Rio de Janeiro, Brazil. - - 2010
This article aims to characterize the mechanical behavior of the Acapella Blue, a respiratory rehabilitation device designed to aid sputum clearance. In this scope, the present study initially describes in detail the peak-to-peak oscillation amplitude (App) and peak frequency (fp) behavior, as well as positive pressure level (Ppl), in the ...
Mayer Jochen - - 2009
PURPOSE OF REVIEW: Cardiac output (CO) and other flow-based hemodynamic variables have become increasingly important to guide treatment of patients undergoing major surgery with expected fluid shifts in the operating room as well as critically ill ICU patients. Established techniques such as pulmonary artery thermodilution, however, might not be justified ...
Kim Y K - - 2009
BACKGROUND: Stroke volume variation (SVV) is being increasingly used to predict fluid responsiveness. Since radial arterial pressure (RAP) and femoral arterial pressure (FAP) frequently showing discrepancies during liver transplantation (LT), we sought to investigate the effect of differing arterial waveforms on SVV and cardiac output (CO) derived from the Vigileo ...
Rieves Adam L - - 2009
The present study proposed to estimate phonation threshold pressure (PTP) noninvasively using airflow redirection into a pneumatic capacitance system. Prospective study. Subjects phonated into the device, which interrupts airflow mechanically and redirects the flow into a pneumatic capacitor. Five interruptions were effected per trial. PTP was estimated as the difference ...
Johnson Paul J PJ Department of Mechanical Engineering, University of Utah, 50 S Central Campus Dr, Rm 2110, Salt Lake, UT 84112, - - 2009
Limitations of standard clinical pressure transducers have hampered our ability to provide reliable measurements of intra-abdominal pressure (IAP) during physical activities. To overcome these limitations, a novel intravaginal transducer (IVT) capable of accurate, reliable, and continuous IAP measurements during normal activity was developed. The design was validated through comparison with ...
Nazari Stefano - - 2010
In past years, we developed expandable devices (type I and II) for sutureless aortic anastomosis. We have now further modified the device (type III) incorporating a second expandable ring, external to the main one, which can be operated contrariwise in such a way that the aortic wall (i.e. the dissection ...
Roehr Charles C - - 2010
BACKGROUND: Excessive peak inspiratory pressures (PIP) and high tidal volumes (Vt) during manual ventilation can be detrimental to the neonatal lung. We compared the influence of different manual ventilation devices and individual professional experience on the extent of applied Vt and PIP in simulated neonatal resuscitation. MATERIAL AND METHODS: One ...
Louis Bruno - - 2010
BACKGROUND: Continuous positive airway pressure (CPAP) maintains a constant pressure to reduce the patient's work of breathing (WOB). The aim of this study was to measure the additional WOB imposed by four current CPAP devices during simulation of a difficult but commonly encountered clinical situation. METHOD: Flow contour, respiratory system ...
Alves Silva Carlos Eduardo - - 2009
BACKGROUND: The Acapella is a respiratory rehabilitation device designed to aid sputum clearance. When the patient exhales through this device, continuous and oscillatory pressure levels are produced. The adequate practical use of the Acapella is critically dependent on the characteristics of the produced pressure, which include the production of a ...
Yigit B - - 2009
Keloids are raised reddish nodules that develop at the site of an injury. They are characterized histologically by an abundance of fibroblasts, thick collagen bundles, and ground substance. Auricular keloid formation is a known complication of ear piercing. Many types of treatments have been described for auricular keloids.Pressure therapy in ...
Rafey Mohammad - - 2009
To diagnose and manage hypertension optimally, we may need to do more than measure the patient's blood pressure in the office using traditional sphygmomanometry. A variety of devices--some already available, validated, and reimbursable, some still in development--provide more information and give us a better picture of the patient's true hypertensive ...
Hamaekers A E W - - 2009
In managing an obstructed upper airway, an emergency transtracheal ventilation device needs to function as a bidirectional airway, allowing both insufflation of oxygen and egress of gas. The aim of the present study was to determine the capability of two self-assembled, three-way stopcock based jet devices and the Oxygen Flow ...
Germano Giuseppe - - 2009
OBJECTIVE: Four oscillometric devices for self-measurement of blood pressure (SBPM) were evaluated according to the International Protocol of the European Society of Hypertension (ESH) in four separate studies. The Pic Indolor Personal Check, Comfort Check and My Check measure blood pressure (BP) at the brachial level; the Travel Check measures ...
Narogan Marina V - - 2009
OBJECTIVE: To validate the oscillometric blood pressure monitor UA-778 in children aged 4-15 years according to the British Hypertension Society protocol. METHOD: In 85 children (38 boys, 47 girls), nine sequential readings were taken simultaneously by two trained observers alternating between the mercury sphygmomanometer and the test device. The last ...
Germano Giuseppe - - 2009
OBJECTIVE: Four oscillometric devices for self-measurement of blood pressure (SBPM) were evaluated according to the International Protocol of the European Society of Hypertension (ESH) in four separate studies. The Pic Indolor Personal Check, Comfort Check and My Check measure blood pressure (BP) at the brachial level; the Travel Check measures ...
Francksen H - - 2009
This study assessed two disposable devices; the newly developed supraglottic airway device i-gel and the LMA-Unique in routine clinical practice. Eighty patients (ASA 1-3) undergoing minor routine gynaecologic surgery were randomly allocated to have an i-gel (n = 40) or LMA-Unique (n = 40) inserted. Oxygen saturation, end-tidal carbon dioxide, ...
Okada Yoshikazu - - 2009
OBJECTIVE: We designed a new irrigation-suction system consisting mainly of a pressure-resistant irrigation fluid container, dual irrigation and suction devices, and an intracontainer pressure regulator. METHODS: The intracontainer pressure can be regulated from 0 to 0.02 MPa. This system is simple and can be operated simultaneously by both an operator ...
Herff Holger - - 2009
AIM: Ventilation of a non-intubated emergency patient by inexperienced rescuers with a standard bag-valve device may result in high inspiratory flow rates and subsequently high airway pressures with stomach inflation. Therefore, a self-inflating bag has been developed that requires lay rescuers to blow up a single-use balloon inside an adult ...
Sanches Paulo R S - - 2009
The pelvic-floor muscles (PFM) play an important role in urinary and fecal continence. Several investigators have studied the PFM using intra-vaginal pressure measurements, but their methods have not been validated. We describe the characteristics of a probe transducer developed to measure PFM strength according to its dynamic response and the ...
Fregonezi Guilherme A F - - 2009
PURPOSE: We aimed to evaluate the functionality of an adapted inspiratory muscle training device designed to allow pressures higher than 41 cmH(2)O that can be precisely controlled. The adaptation was made in a commercially available Threshold IMT device, and the opening pressures and linearity of load were evaluated in an ...
Krakoff Lawrence R - - 2009
OBJECTIVE: Accurate and precise estimation of arterial blood pressure is needed for the management of hypertension. Multiple measurements can be obtained from recorded home blood pressures devices. Averages and other statistics can be calculated. Confidence intervals provide an assessment of the precision with which average pressures are measured. This study ...
Mosti G - - 2009
AIM: Methods to compress thigh veins effectively after venous surgery or endovenous procedures are still disputed. The aim of this paper was to compare the clinical outcomes with three different compression devices as a function of the pressures exerted. METHODS: Fifty-four patients undergoing invagination stripping of the great saphenous vein ...
Wan Yi - - 2009
OBJECTIVE: Accurate blood pressure measurement is important for both the patients and the health service in appropriate treatment and estimation of clinical risk. Few automated devices have been shown to be accurate when compared with mercury sphygmomanometer. This study presents the validation results of the Andon KD-391 semiautomated blood pressure ...
van Dijke Koen - - 2009
We here report on three parallelized designs of the new edge-based droplet generation mechanism, which, unlike existing mechanisms, produces many equally sized droplets simultaneously at a single droplet formation unit. Operation of the scaled-out systems is straight forward; only the oil inlet pressure has to be controlled to let all ...
Lee Jung Joo - - 2009
The bellows-type pneumatic ventricular assist device (VAD) generates pneumatic pressure with compression of bellows instead of using an air compressor. This VAD driver has a small volume that is suitable for portable devices. However, improper pneumatic pressure setup can not only cause a lack of adequate flow generation, but also ...
Jackson Colin - - 2009
INTRODUCTION: Glider flights may require the pilot to sit for many hours in a cramped cockpit that allows little movement. Experiments were undertaken to evaluate the performance of different seat cushions in a glider simulator. METHODS: Subjects were male glider pilots with a maximum height of 1.85 m (6.07 ft) ...
Lei Ming - - 2009
We report fabrication and characterization of a new hydrogel-based microsensor for wireless chemical monitoring. The basic device structure is a high-sensitivity capacitive pressure sensor coupled to a stimuli-sensitive hydrogel that is confined between a stiff porous membrane and a thin glass diaphragm. As small molecules pass through the porous membrane, ...
Sheng Chang-Sheng - - 2009
OBJECTIVE: This study aimed to evaluate the accuracy of the automated Health & Life oscillometric wrist blood pressure monitor HL168JD for home blood pressure monitoring according to the European Society of Hypertension International Protocol. METHODS: Systolic and diastolic blood pressures were sequentially measured in 33 adult Chinese using the mercury ...
Duhig Kate E - - 2009
OBJECTIVE: Hypertension affects approximately one billion individuals worldwide. The effective management of hypertension requires accurate measurement and monitoring of blood pressure. We evaluated the accuracy of a low cost self-measurement oscillometric device, with features suitable for use in a low-resource setting, in an adult population in the developing world according ...
Zhang Yi - - 2009
OBJECTIVE: This study aimed to evaluate the accuracy of the automated oscillometric upper arm blood pressure monitor LD-578 (HONSUN Group, Shanghai, China) for home blood pressure monitoring according to the International Protocol. METHOD: Systolic and diastolic blood pressures were sequentially measured in 33 adult Chinese using a mercury sphygmomanometer (two ...
Hashemian H M - - 2009
This paper discusses the key causes of calibration drift in pressure transmitters and procedures for calibrating pressure transmitters to ensure their accuracy. Calibrating pressure transmitters involves adjusting the potentiometers in the sensor that controls the zero (lowest pressure at which a transmitter is calibrated) and span (the range of pressure ...
Lai Candy H Y - - 2009
INTRODUCTION: Pressure monitoring is crucial for effective pressure therapy. Precise and reliable interface pressure measurement system, however, remains unavailable in current practice. METHODOLOGY: This is a validation study on the application of a recently developed device, the Pliance X System, for static interface pressure measurement. Sensor properties were evaluated through ...
Wiesel Joseph - - 2009
Hypertension is a major risk factor for the development of atrial fibrillation (AF) and for stroke due to AF. Asymptomatic AF can result in a stroke, in patients with risk factors, if it is not detected and treated appropriately. This study evaluated the sensitivity and specificity of an automatic oscillometric ...
Xu Da - - 2009
A well-tested and safe implantable device is now available for long-term ambulatory monitoring of the right ventricular pressure (RVP) waveform of congestive heart failure patients. However, cardiac output (CO) and left atrial pressure (LAP) are more useful for assessing cardiac function and managing volume status. We developed a new technique ...
Zhao Jing - - 2009
The evolution of the crystal structure of rhombohedral PrAlO(3) perovskite with pressure has been investigated by single-crystal x-ray diffraction and Raman scattering experiments. The structural evolution as indicated by lattice strains, octahedral tilts, and the distortions of the octahedral AlO(6) and polyhedral PrO(12) groups with increasing pressure, is controlled by ...
Welsch A-M - - 2009
The pressure evolution of the local structure and dynamics of polar nanoregions in PbSc(0.5)Nb(0.5)O(3) relaxor ferroelectric is analysed by Raman spectroscopy. The pressure dependence of phonon modes up to 10 GPa reveals three characteristic pressures related to changes in the local structure: near 2 GPa, at which ferroic ordering in the Pb ...
Pletea M - - 2009
The stress, growth, and morphology evolution of Al thin films up to 300 nm thick, sputter deposited at a constant rate of 0.04 nm s(-1) onto thermally oxidized Si(100) substrates have been investigated for various sputter pressures in the range from 0.05 to 6 Pa. The stress evolution has been studied during and after ...
Højbjerre Lise - - 2009
BACKGROUND: Subcutaneous tissue is an important target for drug deposition or infusion. A local trauma may induce alterations in local microcirculation and diffusion barriers with consequences for drug bioavailability. We examined the influence of infusion catheters' wear time on local microcirculation and infusion counter pressure. METHODS: One steel catheter and ...
Braga Valdir A - - 2009
Although considered the 'gold standard' for measuring blood pressure in laboratory animals, telemetry would benefit from refinement. In the present study, we tested the hypothesis that the small telemetric device used for blood pressure recording in mice would work for rats as well and would serve as an alternative for ...
Park Sang Hoon - - 2009
PURPOSE: To compare the actual vacuum pressure at the end of an aspiration bypass system (ABS) phaco tip and a conventional tip in conditions similar to those during human cataract surgery. SETTING: Kangbuk Samsung Hospital, Seoul, Korea. METHODS: A 4.0 mm diameter rubber eraser ball was inserted in a phacoemulsified ...
van der Zwan Eduard - - 2009
In this study, we compared microchannel droplet formation in a microfluidics device with a two phase lattice Boltzmann simulation. The droplet formation was found to be qualitatively described, with a slightly smaller droplet in the simulation. This was due to the finite thickness of the interface in the simulations. Dependence ...
Satarkar Nitin S - - 2009
In recent years, hydrogels have attracted attention as active components in microfluidic devices. Here, we present a demonstration of remote controlled flow regulation in a microfluidic device using a hydrogel nanocomposite valve. To create the nanocomposite hydrogel, magnetic nanoparticles were dispersed in temperature-responsive N-isopropylacrylamide (NIPAAm) hydrogels. The swelling and collapse ...
Vaccari M - - 2009
Structural transformations at high pressure in amorphous and quartz-like crystalline GeO(2) have been investigated by using a Paris-Edinburgh press coupled to EXAFS spectroscopy. From both the germanium absorption edge position and the Ge-O distance evolution, new detailed information has been obtained about the pressure behavior of the short range order. ...
Becker Valentin - - 2009
To evaluate a new commercially available system for the intra-gastric measurement of intra-abdominal pressure (IAP). Prospective interventional trial in an intensive care unit of a university hospital. Ten patients with cirrhosis and tense ascites scheduled for paracentesis and instrumented with a ballon-tipped nasogastric tube. Intermittent paracentesis with repeat paired measurements ...
Rapp Joseph H - - 2009
Choices for embolic protection during carotid stent procedures include distal filtration (DF) and proximal occlusion with flow reversal (POFR). DF devices are widely used but have produced only modest improvements in clinical outcomes. There is less experience with POFR devices but single center reports suggest reduced emboli detected by transcranial ...
Herff Holger - - 2011
Background: Automated ventilation devices are becoming more popular for emergency ventilation, but there is still not much experience concerning the optimal ventilation mode. Methods: In a bench model representing a non-intubated patient in respiratory and cardiac arrest, we compared a pressure-cycled with a time- and volume-cycled automated ventilation device in ...
Hoppe U C - - 2009
OBJECTIVE: To evaluate the feasibility and safety of home monitoring of chronic heart failure (CHF) patients using acoustic wireless communication with an implant directly measuring pulmonary artery (PA) pressures. DESIGN: The PAPIRUS (Pulmonary Artery Pressure by Implantable device Responding to Ultrasonic Signal) II trial was a prospective, multicentre phase I ...
Tan Robert - - 2009
A fully implantable wireless pressure sensor system was developed to monitor bladder pressures in vivo. The system comprises a small commercial pressure die connected via catheter to amplifying electronics, a microcontroller, wireless transmitter, battery, and a personal digital assistant (PDA) or computer to receive the wireless data. The sensor is ...
Descatoire Aurélien - - 2009
Numerous studies on the development of new biofeedback device conception have already been undertaken. The devices are used for some methods of compensation for the data loss on sensors set. Patients with loss of protective pain sensation are unable to modify their gait when abnormal and excessive plantar pressure occurs. ...
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