Abstract：
:Pressure ulcers are a major problem worldwide believed to affect over 5% of all hospital in-patients, and countless others in the community at large. Many types of Patient Support Systems (PSS) are sold as pressure ulcer prevention equipment, but no consensus exists as to their mechanical efficacy. The use of human volunteers to assess the mechanical properties of PSS introduces non-repeatability and variability in results which cannot give a statistically significant difference in performance between systems. Mechanical testing without human volunteers provides faster evaluations of PSS, with improved precision and repeatability. An instrumented articulated anthropometric phantom has been developed to investigate the distortion of simulated soft body "tissues" of the buttock and sacral areas due to precise and repeatable static loading on a PSS. The weight of the phantom can be adjusted to 50, 70 and 90 kg and can be applied with the torso inclined at 0 degrees, 45 degrees and 80 degrees. Validation of the phantom by measuring interface pressure using a force sensing array mat indicates that the phantom represents realistic physiological loading conditions. The new method of measuring the distortion of the "artificial tissues" provides a highly selective ranking of PSS.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Bain DS,Scales JT,Nicholson GPdoi
10.1016/s1350-4533(99)00053-3subject
Has Abstractpub_date
1999-06-01 00:00:00pages
293-301issue
5eissn
1350-4533issn
1873-4030pii
S1350-4533(99)00053-3journal_volume
21pub_type
杂志文章abstract：:In this paper, we derive a comprehensive computational model to estimate the arterial pressure and the cardiac output of humans, by refining and adapting the well-established equations of the Windkessel theory. The model inputs are based on patient specific factors such as age, sex, smoking and fitness habits as well ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2008.11.010
更新日期：2009-06-01 00:00:00
abstract：:In this study, a new ensemble averaging technique was developed to measure cardiac output during treadmill exercise. Each dz/dt peak is used as a starting point for ensemble averaging, instead of the conventionally used R point of ECG, in order to prevent the peak dz/dt waveform (C point) to be smoothed, which results...
journal_title：Medical engineering & physics
pub_type： 临床试验,杂志文章
doi：10.1016/s1350-4533(03)00024-9
更新日期：2003-07-01 00:00:00
abstract：:We introduce a novel dual-switch control paradigm based on the simultaneous measurement of frontalis muscle mechanomyography (MMG) and vocalizations (humming) using a single contact microphone attached to the forehead. Vibrations of the face and skull during vocalization are manifested as periodic high-frequency compo...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2010.06.003
更新日期：2010-10-01 00:00:00
abstract：:We attempted to distinguish walking on level ground from walking on a stairway using waist acceleration signals. A triaxial accelerometer was fixed to the subject's waist and the three acceleration signals were recorded by a portable data logger at a sampling rate of 256 Hz. Twenty healthy male subjects were asked to ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(00)00041-2
更新日期：2000-05-01 00:00:00
abstract：:For many decades correlation and power spectrum have been primary tools for digital signal processing applications in the biomedical area. The information contained in the power spectrum is essentially that of the autocorrelation sequence; which is sufficient for complete statistical descriptions of Gaussian signals o...
journal_title：Medical engineering & physics
pub_type： 杂志文章,评审
doi：10.1016/j.medengphy.2010.04.009
更新日期：2010-09-01 00:00:00
abstract：:In most computational fluid dynamic (CFD) analysis of the human lung, it has been assumed that the trachea and branches of the lung have smooth walls. In order to determine if this is a valid assumption, the effects of cartilage rings on airflow and particle deposition in the lungs was determined through conducting si...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2007.06.010
更新日期：2008-06-01 00:00:00
abstract：:We present a finite element based simulation and analysis method to describe the spatial extent of stimulation and the effects of electrode-tissue interactions in subretinal prostheses. In particular, we estimate the threshold stimulation current needed to depolarise and evoke action potentials in the ganglion cells t...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2011.01.015
更新日期：2011-07-01 00:00:00
abstract：:This study proposes semi-automatic determination of geometrical features in hip magnetic resonance (MR) images in order to evaluate the Legg-Calvé-Perthes disease (LCPD). Nine anatomical points on a hip image are selected by a clinician; then eight geometrical indexes of the hip joint are calculated: acetabulum head i...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2004.10.003
更新日期：2005-06-01 00:00:00
abstract：:Stress shielding of the periprosthetic femur following total hip arthroplasty is a problem that can promote the premature loosening of femoral stems. In order to reduce the need for revision surgery it is thought that more flexible implant designs need to be considered. In this work, the mechanical properties of laser...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2014.02.008
更新日期：2014-04-01 00:00:00
abstract：:The present study demonstrates the design, simulation, fabrication and testing of a label-free continuous manipulation and separation micro-device of particles/biological cells suspended on medium based on conventional dielectrophoresis. The current dielectrophoretic device uses three planner electrodes to generate no...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2013.12.010
更新日期：2014-06-01 00:00:00
abstract：:Trunk muscle electromyographic (EMG) signals are often contaminated by the electrical activity of the heart. During low or moderate muscle force, these electrocardiographic (ECG) signals disturb the estimation of muscle activity. Butterworth high-pass filters with cut-off frequency of up to 60 Hz are often used to sup...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2018.04.007
更新日期：2018-07-01 00:00:00
abstract：:The biomechanical strength of the skeleton, and hence the risk of future fractures, depends on both the bone quantity (assessed in terms of bone mineral density) and bone quality (assessed in terms of the integrity of its internal architecture). Precise methods of measuring the calcium-equivalent density of both the t...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(96)00011-2
更新日期：1996-10-01 00:00:00
abstract：:Sclerosis rim surrounding the necrotic area is commonly found in necrotic femoral head, but the biomechanical function of sclerosis rim has received relatively little attention. Little is known about the formation and natural history of sclerosis rim. In the present work, we assume that the necrotic change may trigger...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.09.005
更新日期：2015-12-01 00:00:00
abstract：:A kinematical model of the lower spine was designed and used to obtain a robust estimation of the vertebral rotations during torso movements from skin-surface markers recorded by video-cameras. Markers were placed in correspondence of the anatomical landmarks of the pelvic bone and vertebral spinous and transverse pro...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2004.08.005
更新日期：2004-12-01 00:00:00
abstract：:Postural control deficits are the most disabling aspects of Parkinson's disease (PD), resulting in decreased mobility and functional independence. The aim of this study was to assess the postural control stability, revealed by variables based on the centre of pressure (CoP), in individuals with PD while performing a s...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.08.011
更新日期：2015-11-01 00:00:00
abstract：:Longitudinal anatomic mismatch (LAM) of stenting (i.e., a stenotic artery segment is not fully covered by a deployed stent) worsens the mechanical environment in the treated artery, which most likely is the cause for the associated high risks of restenosis, myocardial infarction and stent thrombosis. To probe the poss...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2017.06.010
更新日期：2017-10-01 00:00:00
abstract：:Intradialytic hypotension (IDH) is a major complication during hemodialysis treatment, and therefore it is highly desirable to identify, at an early stage during treatment, whether the patient is prone to IDH. Heart rate variability (HRV), blood pressure variability (BPV) and baroreflex sensitivity (BRS) were analyzed...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.10.003
更新日期：2015-12-01 00:00:00
abstract：:In this study we integrated between confocal-based cell-specific finite element (FE) modeling and Virtual Cell (VC) transport simulations in order to determine trends of relationship between externally applied compressive deformations and build-up rates of oxygen in myoblast cells, and to further test how mild culture...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2011.04.008
更新日期：2011-11-01 00:00:00
abstract：:Ultrasonic scalers are used in dentistry for removing mineralised plaque, known as calculus, from tooth surfaces. Though there is much information relating to the longitudinal vibrations of scaler probes, corresponding lateral data is limited. Understanding the lateral motion of ultrasonic probes is essential as, when...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2010.02.010
更新日期：2010-07-01 00:00:00
abstract：:Balance impairment is critical for many patient groups such as those with neural and musculoskeletal disorders and also the elderly. Accurate and objective assessment of balance performance has led to the development of several indices based on the measurement of the center of pressure. In this study, a robotic device...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2020.07.006
更新日期：2020-09-01 00:00:00
abstract：:Investigations focused on the gait and physiological limits of human speed have been on-going for more than a century. However, due to measurement limitation a kinetic understanding of the foot-ground collision and how these dynamics differ between individuals to confer speed and limit gait has only recently begun to ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.04.009
更新日期：2015-09-01 00:00:00
abstract：:Cutting and drilling operations in bone are involved in many orthopedic and otolaryngological surgeries. The temperature elevation of these procedures is potentially harmful to bone and soft tissue cells. The research on this topic aims therefore at minimizing temperature elevation and finding optimal process paramete...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2016.06.019
更新日期：2016-10-01 00:00:00
abstract：:A ligamentous, nonlinear, sliding contact, three-dimensional finite element (FE) model of L2-L3 complex was developed to investigate the biomechanical effect of laminectomy with and without facetectomy. The L2-L3 FE model was validated against experimental study under various physiological loadings and found to match ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2003.11.006
更新日期：2004-04-01 00:00:00
abstract：:A flow model utilizing an irrotational, inviscid algorithm of vortex-ring elements simulating the leaflets and source/sink elements simulating the aortic root coupled with a boundary layer model has been developed to model the internal flow phenomena of bi-leaflet mechanical heart valves implanted in the aortic root. ...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/1350-4533(95)00075-5
更新日期：1996-09-01 00:00:00
abstract：:The acetabular cup (AC) is an implant impacted into a bone cavity and used for hip prosthesis surgery. Initial stability of the AC is an important factor for long term surgical success. The aim of this study is to determine the variations of the impact duration during AC implant insertion. Twenty-two bone samples take...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2013.04.005
更新日期：2013-11-01 00:00:00
abstract：:Sequentially drilling multiple holes in bone is used clinically for surface preparation to aid in fusion of a joint, typically under non-irrigated conditions. Drilling induces a significant amount of heat and accumulates after multiple passes, which can result in thermal osteonecrosis and various complications. To und...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2015.06.002
更新日期：2015-09-01 00:00:00
abstract：:Complex congenital heart defects due to the absence of a ventricular chamber can often be treated by the Fontan surgical procedure. The objective of this work was to quantify the haemodynamics in the Fontan operation (cavopulmonary connection) with extracardiac lateral conduit. Four different models based on the finit...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(99)00042-9
更新日期：1999-04-01 00:00:00
abstract：:Dynamic models of the human trunk have been extensively used to investigate the biomechanics of lower back pain and postural instability in different populations. Despite their diverse applications, previous models rely on intrinsic upper body segment parameters (UBSP), e.g., each segment's mass-inertia characteristic...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2010.09.008
更新日期：2011-01-01 00:00:00
abstract：:The strains developed on the surface of a femur with and without an implanted femoral hip replacement were investigated using holographic interferometry (HI). Interferometric fringe data from the four aspects of the loaded femur were quantified and the resulting curvature calculated. Curvature was related to the strai...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/s1350-4533(98)00003-4
更新日期：1998-03-01 00:00:00
abstract：:In this paper a self-opening intrafascicular neural interface (SELINE) has been modeled using both a theoretical approach and a Finite Element (FE) analysis. This innovative self opening interface has several potential advantages such as: higher selectivity due to its three-dimensional structure and efficient anchorag...
journal_title：Medical engineering & physics
pub_type： 杂志文章
doi：10.1016/j.medengphy.2011.06.001
更新日期：2011-12-01 00:00:00
