Abstract：
:The investigation presented in this paper has attempted to study, from a fluid dynamics point of view, the consequences of the presence of a stent on the flow of blood. The method adopted is mainly by numerical simulation using a finite element technique, but visualization experiments and an analytical study have also been carried out. The flow of blood is treated as being transient, laminar and Newtonian within a rigid section of the stented vessel. The flow is driven by an imposed pressure gradient in the form of a physiological waveform. A periodic boundary condition has been applied. Particle trajectories, fluid shear rate contours and wall shear stress maps, together with the use of a simplified form of particle image velocimetry in the experimental work, have been used to interpret the results. It was found that the vessel wall experienced oscillating levels of wall shear stress, in particular extensive exposure to low shear stress. Regions of flow recirculation, points of flow separation and reattachment constantly move in regions of low shear stress. Vortices form and then are destroyed rapidly by reversing flow. Their potential physiological significance to stented arteries is discussed.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Natarajan S,Mokhtarzadeh-Dehghan MRdoi
10.1016/s1350-4533(00)00072-2subject
Has Abstractpub_date
2000-10-01 00:00:00pages
555-66issue
8eissn
1350-4533issn
1873-4030pii
S1350-4533(00)00072-2journal_volume
22pub_type
杂志文章abstract：:Children with severe physical disabilities often require a range of technological devices to aid them with the fundamental tasks carried out in everyday life. These tasks areas may include mobility, communication, environment control and computer access for education. The most efficient, and often the most cost-effect...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(94)90043-4
更新日期：1994-05-01 00:00:00
abstract：:A major challenge during minimally invasive surgery is transfer of high forces through small, flexible instruments, such as needles and catheters, because of their low buckling resistance. In this study, we determined the feasibility of using a Newton's Cradle-inspired catheter (patented) to transfer high-force impuls...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2018.12.025
更新日期：2019-05-01 00:00:00
abstract：:The concept of a monolithic Ti-Ni spinal rod with variable flexural stiffness is proposed to reduce the risks associated with spinal fusion. The variable stiffness is conferred to the rod using the Joule-heating local annealing technique. The annealing temperature and the mechanical properties' distributions resulted ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.07.012
更新日期：2014-11-01 00:00:00
abstract：:We observed an anomaly in the human electroencephalogram (EEG) associated with exposure to terrestrial trunked radio (TETRA) Radiofrequency Fields (RF). Here, we characterize the time and frequency components of the anomaly and demonstrate that it is an artefact caused by TETRA RF interfering with the EEG recording eq...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2013.04.009
更新日期：2013-11-01 00:00:00
abstract：:In recent years, a combination of traction and vibration therapy is usually used to alleviate low back pain (LBP) in clinical settings. Combining head-down tilt (HDT) traction with vibration was demonstrated to be efficacious for LBP patients in our previous study. However, the biomechanics of the lumbar spine during ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2016.10.004
更新日期：2017-01-01 00:00:00
abstract：:The liquid ventilation (LV) technique was previously demonstrated to be a valuable alternative to ordinary gas ventilation, particularly for newborn patients with severely distressed lungs. This work describes a mathematical model of gas transfer phenomena occurring within the lungs of a preterm newborn baby ventilate...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(96)00041-0
更新日期：1997-03-01 00:00:00
abstract：:Interest in patient-specific blood-flow circulation modeling has increased substantially in recent years. The availability of clinical data for geometric and elastic properties together with efficient numerical methods has now made model rendering feasible. This work uses 3-D fluid-structure interaction (FSI) to provi...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2012.08.009
更新日期：2013-06-01 00:00:00
abstract：:Some pulmonary diseases and injuries are believed to correlate with lung viscoelasticity changes. Hence, a better understanding of lung viscoelastic models could provide new perspectives on the progression of lung pathology and trauma. In the presented study, stress relaxation measurements were performed to quantify r...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.05.003
更新日期：2015-08-01 00:00:00
abstract：:Inserting the distal locking screws is a challenging step of the intramedullary nailing procedures due to the nail deformation that makes the proximally mounted targeting systems ineffective. A pre-planning methodology is proposed, based on an analytical model of the nail-bone construct, to predict the nail deformatio...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.09.012
更新日期：2019-12-01 00:00:00
abstract：:A dynamic biomechanical model to determine loads (joint forces) attained at the lumbosacral joint-centre during the stance phase of normal level walking was developed. The biomechanical model was based on rigid free body-segments; namely, the foot, shank, thigh, pelvis and head, arms and trunk (HAT) segments. In this ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(95)90374-k
更新日期：1995-01-01 00:00:00
abstract：:The second-order difference plot, as a modified Poincaré plot, is one of the important approaches for assessing the dynamics of heart rate variability. However, corresponding quantitative analysis methods are relatively limited. Based on the second-order difference plot, we propose a novel method, called the multi-sca...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.09.015
更新日期：2014-12-01 00:00:00
abstract：OBJECTIVE:To illustrate (a) whether a statistical shape model (SSM) augmented with anatomical landmark set(s) performs better fitting and provides improved clinical relevance over non-augmented SSM and (b) which anatomical landmark set provides the best augmentation strategy for predicting the glenoid region of the sca...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.11.007
更新日期：2020-02-01 00:00:00
abstract：:Two optimization-driven approaches were employed to develop kinematics-driven (KD) and stability-based kinematics-driven (SKD) musculoskeletal models of an adult thoracolumbar to ascertain the significance of spine stability in holding the upright-standing posture after muscular disuse atrophy. Both models were used t...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.07.008
更新日期：2019-11-01 00:00:00
abstract：:Surface electromyography (sEMG) has dominated upper-limb prosthesis control for decades due to its simplicity and effectiveness [1-3]. However, the inherent variability of EMG signal hinders the flexible and accurate control of advanced multi-functional prosthesis. This study is an attempt to use ultrasonography (US) ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2019.11.005
更新日期：2020-01-01 00:00:00
abstract：:This study describes the method of determination of the position and orientation of artificial knee implants using a single-plane radiograph. To simplify the 3D/2D matching problem, we proposed to use small markers embedded in a bone. From the image coordinates of markers, it is possible to estimate the position and o...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(03)00037-7
更新日期：2003-06-01 00:00:00
abstract：:In contrast enhanced magnetic resonance imaging (MRI) and computed tomography (CT), the equilibrium distribution of anionic contrast agent is expected to reflect the fixed charged density (FCD) of articular cartilage. Diffusion is mainly responsible for the transport of contrast agents into cartilage. In osteoarthriti...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2010.06.002
更新日期：2010-10-01 00:00:00
abstract：:This paper reports on the findings of an extensive survey investigating practising design engineers' perceptions of new product development within the UK medical device industry. The design activity recorded was predominantly the small-scale development of low volume products. Explicit formal procedures were rarely us...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(96)00021-5
更新日期：1996-12-01 00:00:00
abstract：:The aim of this study was to evaluate comparatively five methods for automating mesh generation (AMG) when used to mesh a human femur. The five AMG methods considered were: mapped mesh, which provides hexahedral elements through a direct mapping of the element onto the geometry; tetra mesh, which generates tetrahedral...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(97)00049-0
更新日期：1998-01-01 00:00:00
abstract：:The incudostapedial joint (ISJ) is a synovial joint connecting the incus and stapes in the middle ear. Mechanical properties of the ISJ directly affect sound transmission from the tympanic membrane to the cochlea. However, how ISJ properties change with frequency has not been investigated. In this paper, we report the...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2018.02.006
更新日期：2018-04-01 00:00:00
abstract：:This article reviews the role of cavitation in the therapeutic applications of ultrasound and laser surgery, and the cavitation effects in mechanical heart valves. Whenever laser pulses are used to ablate or disrupt tissue in a liquid environment, cavitation bubbles are produced which interact with the tissue. The int...
journal_title：Medical engineering & physics
pub_type： 杂志文章,评审
doi：10.1016/j.medengphy.2009.03.007
更新日期：2009-09-01 00:00:00
abstract：:We have developed a computer-based system to simulate a guidewire in blood vessels for surgical planning, intra-operative assistance, and to facilitate the design of new guidewires. In this study, we compared simulation results with experimental results for validation of the simulation system. First, we inserted a com...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.09.012
更新日期：2014-12-01 00:00:00
abstract：:Hermetic electrical feedthroughs are essential for safe and functional active implantable biomedical devices and for a wide range of other applications such as batteries, supercapacitors, OLEDs and solar cells. Ceramics and metals have previously been the materials of choice for encapsulations, while polymers have adv...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2017.01.010
更新日期：2017-04-01 00:00:00
abstract：:We adopt the Ensemble Empirical Mode Decomposition (EEMD) method, with an appropriate thresholding on the Intrinsic Mode Functions (IMFs), to denoise the magnetocardiography (MCG) signal. To this end, we discuss the two associated problems that relate to: (i) the amplitude of noise added to the observed signal in the ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.06.023
更新日期：2014-10-01 00:00:00
abstract：:A portable, lightweight home ankle exerciser was designed and built by the Biomedical Engineering Department of University Hospital in London, Ontario, Canada. The ankle exerciser incorporates several unique features that overcomes the drawbacks of exercise equipment presently available. For optimal muscle strengtheni...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(95)00057-7
更新日期：1996-06-01 00:00:00
abstract：:The electrocardiogram (ECG) is a well-established technique for determining the electrical activity of the heart and studying its diseases. One of the most common pieces of information that can be read from the ECG is the heart rate (HR) through the detection of its most prominent feature: the QRS complex. This paper ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.03.019
更新日期：2015-06-01 00:00:00
abstract：:In stark contrast to the inspiring functionality of the natural hand, limitations of current upper limb prostheses stemming from marginal feedback control, challenges of mechanical design, and lack of sensory capacity, are well-established. This paper provides a critical review of current sensory systems and the poten...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2005.09.009
更新日期：2006-07-01 00:00:00
abstract：:Airway stents improve pulmonary function and quality of life in patients suffering from airway obstruction. The aim of this study was to compare main types of stents (silicone, balloon-dilated metal, self-expanding metal, and covered self-expanding metal) in terms of their mechanical properties and the radial forces t...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.02.008
更新日期：2015-04-01 00:00:00
abstract：:Investigations into the effects of sterilization on a new biomechanical pressure sensor are necessary before contemplating in vivo use. Ten, designated Experimental, "K-Scan" digital pressure sensor arrays were sterilized with ethylene oxide gas (EtO), and their ability to accurately and reproducibly measure an applie...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(03)00119-x
更新日期：2003-11-01 00:00:00
abstract：:Numerical simulations of eye globes often rely on topographies that have been measured in vivo using devices such as the Pentacam or OCT. The topographies, which represent the form of the already stressed eye under the existing intraocular pressure, introduce approximations in the analysis. The accuracy of the simulat...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2012.09.006
更新日期：2013-02-01 00:00:00
abstract：:Tissue engineering represents a new field aiming at developing biological substitutes to restore, maintain, or improve tissue functions. In this approach, scaffolds provide a temporary mechanical and vascular support for tissue regeneration while tissue in-growth is being formed. These scaffolds must be biocompatible,...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.05.006
更新日期：2014-08-01 00:00:00
