419 resources related to Heart valves
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INTERMAG is the premier conference on all aspects of applied magnetism and provides a range of oral and poster presentations, invited talks and symposia, a tutorial session, and exhibits reviewing the latest developments in magnetism.
The conference program will consist of plenary lectures, symposia, workshops andinvitedsessions of the latest significant findings and developments in all the major fields ofbiomedical engineering.Submitted papers will be peer reviewed. Accepted high quality paperswill be presented in oral and postersessions, will appear in the Conference Proceedings and willbe indexed in PubMed/MEDLINE & IEEE Xplore
The IEEE International Symposium on Biomedical Imaging (ISBI) is the premier forum for the presentation of technological advances in theoretical and applied biomedical imaging.ISBI 2019 will be the 16th meeting in this series. The previous meetings have played a leading role in facilitating interaction between researchers in medical and biological imaging. The 2019 meeting will continue this tradition of fostering cross fertilization among different imaging communities and contributing to an integrative approach to biomedical imaging across all scales of observation.
2019 IEEE 58th Conference on Decision and Control (CDC)
The CDC is recognized as the premier scientific and engineering conference dedicated to the advancement of the theory and practice of systems and control. The CDC annually brings together an international community of researchers and practitioners in the field of automatic control to discuss new research results, perspectives on future developments, and innovative applications relevant to decision making, systems and control, and related areas.The 58th CDC will feature contributed and invited papers, as well as workshops and may include tutorial sessions.The IEEE CDC is hosted by the IEEE Control Systems Society (CSS) in cooperation with the Society for Industrial and Applied Mathematics (SIAM), the Institute for Operations Research and the Management Sciences (INFORMS), the Japanese Society for Instrument and Control Engineers (SICE), and the European Union Control Association (EUCA).
The conference covers all aspects of the technology associated with ultrasound generation and detection and their applications.
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Both general and technical articles on current technologies and methods used in biomedical and clinical engineering; societal implications of medical technologies; current news items; book reviews; patent descriptions; and correspondence. Special interest departments, students, law, clinical engineering, ethics, new products, society news, historical features and government.
Telemedicine, teleradiology, telepathology, telemonitoring, telediagnostics, 3D animations in health care, health information networks, clinical information systems, virtual reality applications in medicine, broadband technologies, and global information infrastructure design for health care.
Measurements and instrumentation utilizing electrical and electronic techniques.
Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The Transactions publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
3rd International Conference 'Novel Applications of Wide Bandgap Layers' Abstract Book (Cat. No.01EX500), 2001
Development in thin-layer diamond-like coatings is a very crucial advance in the field of improvement of biomaterial biocompatibility. Owing to their already investigated properties, diamond-like carbon (DLC) and nanocrystalline diamond (NCD) coatings deposited on implants, which are made of materials that can cause undesirable reactions in the organism, can significantly improve the parameters a spare part of the human body ...
Proceedings of the Second Joint 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] [Engineering in Medicine and Biology, 2002
Numerical studies, in vitro and in vivo measurements were conducted, aimed at quantifying free emboli formation and procoagulant properties of platelets induced by flow past mechanical heart valves (MHV). 2D and 3D pulsatile turbulent flow simulations were conducted past a St. Jude Medical MHV in the aortic position, to study the effects of MHV implantation on valve thrombogenicity. Shear stress ...
Proceedings of the 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (Cat. No.00CH37143), 2000
Presents some recently obtained results regarding possibility of application of wavelet neural networks (WNN) for both description and further analysis of events happening with the artificial heart valves. It is extremely important to create a tool allowing analysis of flow pattern through an artificial heart valve prosthesis, which makes possible the extraction of some conclusions leading to valve prosthesis design ...
IEEE Engineering in Medicine and Biology Magazine, 1995
Several major suppliers of material used in medical devices, including Dow Chemical, Dow Corning and DuPont have recently decided not to sell these materials to device manufacturers. Other material suppliers have done the same or are reviewing their policies on this matter. Some of the biomaterials that have been or may soon become unavailable for medical device manufacturing include polyurethane ...
Proceedings Pacific Medical Technology Symposium-PACMEDTek. Transcending Time, Distance and Structural Barriers (Cat. No.98EX211), 1998
The Pacific Island Health Care Project cares for 250-500 patients from the US- associated Pacific Islands. Unique to the Pacific Basin is a high incidence of acute rheumatic fever, a condition that not uncommonly results in valvular heart disease. Identification of patients with severe valvular heart disease may qualify them for care in the military medical system under this project. ...
Microfluidic devices for precision biological measurement: Stephen Quake
IMS 2015: Maxwells Legacy: The Heart and Soul of the EM Discipline
Sections Congress 2014 IGNITE! Sessions pt. 4
Part Two: Interview with John Tisdale—IEEE VIC Summit 2018
IMS 2014: Dr. Rudolph Henning Memorial
IEEE Region 10 Congress 2015
Part 1: Interview with John Tisdale—IEEE VIC Summit 2018
IEEE Medal for Innovations in Healthcare Technology - Thomas F. Budinger - 2018 IEEE Honors Ceremony
Materials Challenges for Next-Generation, High-Density Magnetic Recording - Kazuhiro Hono: IEEE Magnetics Distinguished Lecture 2016
IEEE Sections Congress 2014: Luc Van den Hove, Wearable Medical Technology
Next Generation Power Supplies - APEC 2016
Robot Storytelling for Ethical Origins, Services, and Futures: IEEE TechEthics Featured Talk with Heather Knight
Washington Internships for Students of Engineering
EDOC 2010 - Dr. Benjamin Grosof Keynote
IEEE Life Sciences - Joseph M. Smith Interview
Development in thin-layer diamond-like coatings is a very crucial advance in the field of improvement of biomaterial biocompatibility. Owing to their already investigated properties, diamond-like carbon (DLC) and nanocrystalline diamond (NCD) coatings deposited on implants, which are made of materials that can cause undesirable reactions in the organism, can significantly improve the parameters a spare part of the human body should be characterised by. Diamond- like carbon (DLC) is attractive as a wear-resistant coating for biomedical applications due to its high hardness and low coefficient of friction, chemical inertness and smooth surface finish. One important property of both hard and soft DLC is their biocompatibility, and the potential of DLC coatings for biomedical applications has been extensively reported in the literature. In addition to biocompatibility, this potential is related to the fact that DLC is wear-resistant, smooth/low friction, and inert to chemical attack, and it forms a hermetic coating.
Numerical studies, in vitro and in vivo measurements were conducted, aimed at quantifying free emboli formation and procoagulant properties of platelets induced by flow past mechanical heart valves (MHV). 2D and 3D pulsatile turbulent flow simulations were conducted past a St. Jude Medical MHV in the aortic position, to study the effects of MHV implantation on valve thrombogenicity. Shear stress histories of platelets along turbulent trajectories exposed the platelets to elevated shear stresses around the leaflets, leading them to entrapment within the shed vortices formed in the wake of the valve. In vitro platelet studies were conducted in a model of left ventricular assist device (LVAD), using an innovative platelet activity state (PAS) assay. The platelet activation significantly increased as a function of the recirculation time past the valve, and as compared to controls. Transcranial Doppler (TCD) measurements were conducted in the carotid artery of sheep with implanted MHV, showing a marked increase in the number of HITS (high intensity transient signals) signifying the passage of free emboli generated by the valve. The HITS were analyzed to distinguish between gaseous and thrombi emboli. Finally, PAS measurements were conducted with sheep platelets, showing marked increase of platelet activation after valve implantation.
Presents some recently obtained results regarding possibility of application of wavelet neural networks (WNN) for both description and further analysis of events happening with the artificial heart valves. It is extremely important to create a tool allowing analysis of flow pattern through an artificial heart valve prosthesis, which makes possible the extraction of some conclusions leading to valve prosthesis design process improvement.
Several major suppliers of material used in medical devices, including Dow Chemical, Dow Corning and DuPont have recently decided not to sell these materials to device manufacturers. Other material suppliers have done the same or are reviewing their policies on this matter. Some of the biomaterials that have been or may soon become unavailable for medical device manufacturing include polyurethane for heart valves, polyethelene for artificial joints and silicone for implants. The withdrawal of biomaterials suppliers is the result of a number of lawsuits filed against materials suppliers by persons claiming to have been injured by medical devices. The largest group consists of plaintiffs in breast implant litigation. The author considers contributing factors in law, the seriousness of the problem and solutions to the problem.<<ETX>>
The Pacific Island Health Care Project cares for 250-500 patients from the US- associated Pacific Islands. Unique to the Pacific Basin is a high incidence of acute rheumatic fever, a condition that not uncommonly results in valvular heart disease. Identification of patients with severe valvular heart disease may qualify them for care in the military medical system under this project. Echocardiography has become an essential diagnostic tool for the cardiologist in identifying heart valve problems. Brooke Army Medical Center (BAMC) has established a digital echocardiography network to serve the Great Plains Region. Currently, echocardiograms are digitized at remote sites, transferred to BAMC for evaluation and stored in DICOM standard format on optical disk. The digital network system provides improved care for patients, reduces patient transport costs, permits local follow-up and reduces health care costs. New digital technologies currently under evaluation at our institution will provide smaller, less costly, portable digital imaging systems and make digital echocardiography imaging networks feasible for remote health care facilities. Combining this technology with the new era of digital imaging will allow portable echoes to be used as an extension of the stethoscope. Evaluating heart function and valvular disease in a local health facility will decrease the need for transportation of the patient to a larger facility for diagnosis or follow-up evaluation.
We have previously examined the effects of fatigue on bioprosthetic heart valve (BHV) cusp 3D geometry and structure. It was found that the regions of the cusp with highest curvature correlated to the regions that experienced the highest damage. However, while of high spatial resolution, the data obtained in that study was done under static, zero load conditions. To date, there are no dynamic data on how the aortic valve deforms and how this changes with chemical fixation and fatigue. In the study, we utilize dynamic imaging data from both the natural and pericardial BHV to begin to study the shape and deformation in real time of natural and BHV deformations during the cardiac cycle.
Evaluation of prosthetic heart valves using Doppler echocardiography remains still controversial although Doppler technique has become standardized for assessing native heart valve function. One of the reasons is the discrepancy between Doppler and catheter gradient due to pressure recovery. This threshold can be overcome by in vitro standardization effects because both gradients are coupled by /spl Delta/p/sub doppler/=8g/K /spl Delta/p/sub catheter/ with K pressure loss coefficient dependent on prosthetic valve geometry and g gravitational acceleration. The authors try to give some clarification in this matter.<<ETX>>
The geometry and orientation of implantation of prosthetic heart valves have a major influence on the flow pattern in the left ventricle. Consequently, for developers of prosthetic heart valves, knowledge of flow properties in the ventricle is of great importance to optimization of designs and determination of the optimal orientation. The objective of this study is to analyse flow in a left ventricle model by means of an experimentally validated 3D computational method The computational method, using an arbitrary Euler- Lagrange finite element method to solve nonstationary Navier-Stokes equations for Newtonian fluids, was applied to two orientations of a model mitral valve prosthesis and showed significantly different flow fields for the two cases. Quantitative experimental measurements using particle image velocimetry were carried out to enable validation of the computational method.
Heart sound is one of the oldest means for assessing the function of heart valves. It helps, together with echocardiograms and electrocardiographs, to give a clear and proper diagnosis of several diseases. Artificial neural networks are used to classify several valve-related heart disorders. A library of heart sound files, recorded via the traditional stethoscope, are used to extract relevant features using several signal processing tools, e.g., discrete wavelet transform (DWT), fast Fourier transform (FFT) and linear predictive coding (LPC). The achieved recognition rates were around 95.7%.
In order to improve long-term durability of bioprosthetic heart valve, stress distribution of bioprosthetic heart valve leaflets with different shapes under the same load is analyzed and compared based on finite element method. Combining traditional design theories and modern design methods, we create the cylindrical, spherical, paraboloidal and ellipsoidal curved surfaces in accordance with the geometrical equations in the appropriate frame ordinal. Based on the stress analysis of two kinds of curved surfaces, we take turns to create relative inverse conic curved surfaces which satisfy the actual condition. Meanwhile, the space positions of boundary curves and important points are determined by the intersected curves and axis of revolution. Geometrical design and the finite element analysis could provide direct and useful information for the bioprosthetic heart valve designer. The experimental results of the finite element analysis reveal that stress distribution of different bioprosthetic heart valve leaflets is quite different in diastole time. Ellipsoidal valve leaflets have the following advantages over spherical, paraboloidal and cylindrical valves leaflets: one is that the peak stress area of ellipsoidal valve leaflets is comparatively far from seam position, the other is that the maximal primary stress of ellipsoidal valve leaflets is lower than that of spherical, paraboloidal and cylindrical valves leaflets. Therefore, mechanical properties of ellipsoidal valves leaflets are superior to those of spherical, paraboloidal and cylindrical valves leaflets.
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