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Journal of Medical Engineering & Technology

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https://www.readbyqxmd.com/read/30203698/nonlinear-analysis-of-heart-rate-variability-of-healthy-subjects-and-patients-with-chronic-obstructive-pulmonary-disease
#1
S G Caliskan, M Polatli, M D Bilgin
Chronic obstructive pulmonary disease (COPD) is one of the causes of mortality worldwide with an increasing prevalence. Heart rate variability (HRV) reflects the regulation mechanism of the cardiac activity by the autonomic nervous system. The assessment of HRV by using nonlinear methods is more sensitive for the detection of complexity when compared to linear methods. This study aims to get information about the autonomic dysfunction occurred in patients with COPD by analysing the complexity of HRV. Electrocardiogram signals recorded from healthy subjects, patients with moderate COPD and severe COPD (eight subjects per group) were analysed...
September 11, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/30198806/validation-of-the-fitbit-zip-and-fitbit-flex-with-pregnant-women-in-free-living-conditions
#2
A St-Laurent, M M Mony, M È Mathieu, S M Ruchat
Physical activity (PA) is a part of a healthy pregnancy. To date, no consumer-based activity monitors have been validated with this population. The aim of this study was to validate the Fitbit Zip and Fitbit Flex monitors in free-living conditions with pregnant women using the ActiGraph GT3X as the ?gold standard?. We compared the accuracy of the Fitbit Zip and Fitbit Flex devices in measuring steps, sedentary time and time spent in different activity intensities. Sixteen women in their third trimester of pregnancy wore the ActiGraph GT3X (hip) plus one Fibit Zip (hip) and one Fitbit Flex (wrist) during seven consecutive days...
September 10, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/30175934/neuromodulatory-effect-of-repetitive-transcranial-magnetic-stimulation-pulses-on-functional-motor-performances-of-spastic-cerebral-palsy-children
#3
Meena Gupta, Bablu Lal Rajak, Dinesh Bhatia, Arun Mukherjee
BACKGROUND: Neuromodulation is emerging as a new therapeutic field towards treatment of neurological disorders through advances in medical devices. Repetitive Transcranial Magnetic Stimulation (rTMS) is one such neuromodulatory device that has received increasing interest as a tool for modulating cortical excitability that influence motor activity in both normal and diseased population. However, the therapeutic effect of rTMS varies depending on stimulation frequency, intensity, pulse trains, duration, etc...
September 3, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/30124110/strain-distribution-on-a-finger-link-a-static-simulation-study
#4
Jiawen Liu, Paul Chappell, Neil White
Functional prosthetics hands which have the ability to help amputees perform tasks in daily life have been developed over many years. These hands need a control system which is fed information from sensors mounted on a prosthetic hand and human-machine interface. A variety of sensors therefore been developed for the prosthetic hand to measure fingertip force, joint angle (position), object slip, texture and temperature. However, most of the strain/stress sensors are attached to the fingertip. In this paper, the potential positions for strain sensors on the side of the finger link of the prosthetic hand are investigated that, in the future, will allow for force control in a lateral or key grip...
August 20, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/30019971/low-cost-multifrequency-electrical-impedance-based-system-mfeibs-for-clinical-imaging-design-and-performance-evaluation
#5
Gurmeet Singh, Sneh Anand, Brejesh Lall, Anurag Srivastava, Vaneet Singh
Electrical impedance tomography (EIT) is an upcoming and capable imaging modality used for clinical imaging. It is non-invasive, non-ionising and an inexpensive technique. This paper explains the designing and the analysis of a low-cost multifrequency electrical impedance-based system (MFEIBS) having a flexible mechanism of interfacing up to 32 electrodes, suitable for 1 kHz-2 MHz. Various indicators to check the performance of the EIT system were evaluated and presented here. The performance of VCO and VCCS was measured up to 2 MHz...
July 18, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/30014752/an-energy-efficiency-routing-protocol-for-wireless-body-area-networks
#6
Bahae Abidi, Abdelillah Jilbab, El Haziti Mohamed
The wireless body area networks (WBANs) play an important role in monitoring and minimising the duration of patients stays at the hospital. The aim of our study was to design an energy efficient routing protocol for WBANs taking into consideration the minimisation of energy and maximisation of the network lifetime, such as that the routing is recognised as a resource hungry operation. In this protocol, to confront the different constraints, we use the concept of the gateway body sensor which is responsible for sending data to the base station...
July 17, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29912600/a-non-invasive-measurement-of-the-knee-contact-force-using-a-subject-specific-musculoskeletal-model-to-investigate-osteotomy
#7
Fateme Badie, Hamid Reza Katouzian, Mostafa Rostami
The varus knee has been defined as a Hip-Knee-Ankle alignment of less than 180 degrees. Varus knee alignment increases the load on the medial knee and also the risk of osteoarthritis. High tibial osteotomy has been designed to modify the malalignment of varus knee. The aim of this study was to investigate the osteotomy effects on knee adduction moment (KAM) and contact forces using a musculoskeletal and subject-specific knee model. A patient with varus knee and no symptoms of any other disease or disability participated in this study...
June 18, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29911930/impact-of-epoc-adjustment-on-estimation-of-energy-expenditure-using-activity-monitors
#8
Veronika Pribyslavska, Jennifer L Caputo, John M Coons, Vaughn W Barry
PURPOSE: To examine the accuracy of activity monitors in estimating energy expenditure (EE) during activities of varying mode and intensity and to evaluate the impact of including energy expended during recovery from activity (EPOC) on the EE estimate. EE estimates obtained from the Fitbit Surge (FBS), Garmin Vívofit (GV) and SenseWear Armband Mini (SWA) were compared to criterion EE with and without EPOC adjustments during moderate- and vigorous-intensity treadmill and cycling activities...
June 18, 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29863426/evaluation-of-inflammatory-processes-by-ftir-spectroscopy
#9
Laís Morandini Rodrigues, Luís Felipe das Chagas E Silva Carvalho, Franck Bonnier, Ana Lia Anbinder, Herculano da Silva Martinho, Janete Dias Almeida
Fourier transform infrared (FTIR) spectroscopy is a powerful diagnosis technique and has been used to identify patterns of molecular changes based on vibration modes. The objective of this study was to evaluate inflammatory fibrous hyperplasia (IFH) lesions and oral normal mucosa (NM) initially with histopathological exam and then using micro-FTIR spectroscopy to analyse the samples. Eleven IFH and 11 NM samples were analysed at five different points to cover the largest area possible by the micro-FTIR technique...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29846134/a-comprehensive-comparison-of-simple-step-counting-techniques-using-wrist-and-ankle-mounted-accelerometer-and-gyroscope-signals
#10
Matthew B Rhudy, Joseph M Mahoney
The goal of this work is to compare the differences between various step counting algorithms using both accelerometer and gyroscope measurements from wrist and ankle-mounted sensors. Participants completed four different conditions on a treadmill while wearing an accelerometer and gyroscope on the wrist and the ankle. Three different step counting techniques were applied to the data from each sensor type and mounting location. It was determined that using gyroscope measurements allowed for better performance than the typically used accelerometers, and that ankle-mounted sensors provided better performance than those mounted on the wrist...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29846101/validity-of-the-total-body-centre-of-gravity-during-gait-using-a-markerless-motion-capture-system
#11
Ryo Tanaka, Takuya Kubota, Takahiro Yamasaki, Ariaki Higashi
PURPOSE: The purpose of this study was to examine the validity of total body centre of gravity (COG) measurement during gait with markerless motion capture system (MLS) on the basis of values acquired with a marker-based motion capture system (MBS). MATERIALS AND METHODS: Thirty young healthy subjects walked on a flat surface as coordinate data from their bodies were acquired using the Kinect v2 (as a MLS) and Vicon systems (as a MBS). COG was calculated using coordinate data of the total body...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29798699/effect-of-filtering-with-time-domain-features-for-the-detection-of-epileptic-seizure-from-eeg-signals
#12
A Sharmila, P Geethanjali
Pattern recognition plays an important role in the detection of epileptic seizure from electroencephalogram (EEG) signals. In this pattern recognition study, the effect of filtering with the time domain (TD) features in the detection of epileptic signal has been studied using naive Bayes (NB) and supports vector machines (SVM). It is the first time the authors attempted to use TD features such as waveform length (WL), number of zero-crossings (ZC) and number of slope sign changes (SSC) derived from the filtered and unfiltered EEG data, and performance of these features is studied along with mean absolute value (MAV) which has been already attempted by the researchers...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29798696/epileptic-seizure-anticipation-and-localisation-of-epileptogenic-region-using-eeg-signals
#13
Aarti Sharma, J K Rai, R P Tewari
Electric activity of brain gets disturbed prior to epileptic seizure onset. Early prediction of an upcoming seizure can help to increase effectiveness of antiepileptic drugs. The scalp electroencephalogram signals contain information about the dynamics of brain and have been used to predict an upcoming seizure and localise its zone. The objective of this paper is to localise the epileptogenic region and predict an upcoming seizure at the earliest. To localise epileptogenic region, Electroencephalogram signals are categorised into four regions of brain (Frontal, Temporal, Parietal and Central)...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29671367/3d-bio-printing-technology-for-body-tissues-and-organs-regeneration
#14
Esmaeil Biazar, Masoumeh Najafi S, Saeed Heidari K, Meysam Yazdankhah, Ataollah Rafiei, Dariush Biazar
In the last decade, the use of new technologies in the reconstruction of body tissues has greatly developed. Utilising stem cell technology, nanotechnology and scaffolding design has created new opportunities in tissue regeneration. The use of accurate engineering design in the creation of scaffolds, including 3D printers, has been widely considered. Three-dimensional printers, especially high precision bio-printers, have opened up a new way in the design of 3D tissue engineering scaffolds. In this article, a review of the latest applications of this technology in this promising area has been addressed...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29671366/a-new-approach-for-identification-of-heartbeats-in-multimodal-physiological-signals
#15
Omkar Singh, Ramesh Kumar Sunkaria
In this paper, a technique is proposed for detection of heartbeats in multimodal data. Recording of multiple physiological signals from the same subject is common practice nowadays. Multiple physiological signals are generally available but are processed separately without taking into consideration information from other relevant signals. The heartbeats are generally detected from R peaks in electrocardiogram (ECG) signal, however, if ECG is noisy, other signals reflecting the cardiac activity may be used for identifying heartbeats...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29582695/development-of-a-pressure-sensor-system-for-unobtrusive-monitoring-of-abdominal-muscle-activities
#16
Joonnyong Lee, Jonghyun Park, Kyu Jin Lee, Minkyung Cho, Keewon Kim, Hee Chan Kim, Sun Gun Chung
Surface electromyogram (sEMG) is often used by to objectively measure muscular activity during rehabilitation exercises. sEMG is accurate, but it is unsuitable for uses outside the clinic, and patients can benefit from an unobtrusive device which can be readily used to ubiquitously measure abdominal muscle activation. In this study, we present a pressure sensor system which can be latched onto a belt to measure abdominal muscle activation. sEMG and pressure sensor output were measured in 15 healthy young males during isometric trunk flexion exercise (public trials registration number, KCT0002351), and the results were highly correlated (median R > 0...
April 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29575961/effect-of-magnetic-field-on-haemodynamic-perturbations-in-atherosclerotic-coronary-arteries
#17
Ashkan Javadzadegan, Abouzar Moshfegh, Masud Behnia
Haemodynamic perturbations including elevated blood viscosity, low and oscillatory shear stress are understood to be important pathogenic mediators in atherosclerosis. These haemodynamic abnormalities are influenced by the presence of a magnetic field. This study conducted computational fluid dynamics (CFD) analysis in 4 coronary artery models, derived from authentic human coronaries, with mild and moderate and severe stenosis severity. The aim was to investigate the effect of a static magnetic field of varying intensities on blood viscosity, areas of low wall shear stress (ALWSS), maximum wall shear stress (MWSS) and length and volume of flow recirculation zones...
February 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29569983/the-development-of-a-novel-high-precision-major-depressive-disorder-screening-system-using-transient-autonomic-responses-induced-by-dual-mental-tasks
#18
Takemi Matsui, Toshikazu Shinba, Guanghao Sun
12.6% of major depressive disorder (MDD) patients have suicide intent, while it has been reported that 43% of patients did not consult their doctors for MDD, automated MDD screening is eagerly anticipated. Recently, in order to achieve automated screening of MDD, biomarkers such as multiplex DNA methylation profiles or physiological method using near infra-red spectroscopy (NIRS) have been studied, however, they require inspection using 96-well DNA ELIZA kit after blood sampling or significant cost. Using a single-lead electrocardiography (ECG), we developed a high-precision MDD screening system using transient autonomic responses induced by dual mental tasks...
February 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29569970/spinal-dura-mater-biophysical-characteristics-relevant-to-medical-device-development
#19
REVIEW
Sean J Nagel, Chandan G Reddy, Leonardo A Frizon, Matthieu K Chardon, Marshall Holland, Andre G Machado, George T Gillies, Matthew A Howard, Saul Wilson
Understanding the relevant biophysical properties of the spinal dura mater is essential to the design of medical devices that will directly interact with this membrane or influence the contents of the intradural space. We searched the literature and reviewed the pertinent characteristics for the design, construction, testing, and imaging of novel devices intended to perforate, integrate, adhere or reside within or outside of the spinal dura mater. The spinal dura mater is a thin tubular membrane composed of collagen and elastin fibres that varies in circumference along its length...
February 2018: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29560773/acoustic-emission-technology-can-warn-of-impending-iatrogenic-femur-fracture-during-femoral-canal-preparation-for-uncemented-hip-replacement-a-cadaveric-animal-bone-study
#20
Pierre H M Pechon, Rhys Pullin, Mark J Eaton, Stephan A Jones, Sam Evans
During uncemented hip arthroplasty the femoral prosthesis can be fitted too tightly into the femoral canal, causing a hoop-stress fracture of the proximal femur. The research undertaken evaluated Acoustic Emission (AE) technology as a potential method of detecting a fracture forming in this manner, in an attempt to assess whether this technology may be used as a means of early warning of impending fracture during surgery. Deer femora were prepared in a manner similar to surgery and uncemented hip arthroplasty broaches were inserted until fracture occurred...
February 2018: Journal of Medical Engineering & Technology
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