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Biomedical Engineering Online

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https://www.readbyqxmd.com/read/28810871/effect-of-different-inner-core-diameters-on-structural-strength-of-cannulated-pedicle-screws-under-various-lumbar-spine-movements
#1
Chia-Ming Chang, Yu-Shu Lai, Cheng-Kung Cheng
BACKGROUND: Currently, cannulated pedicle screws have been widely used in minimal invasive or navigation techniques. However, the stress distribution and the strength of different core diameters of cannulated screw are not clear. This study aimed to investigate the mechanical strength of cannulated screws with different inner core diameter under various lumbar spine movements using finite element analysis. RESULTS: The results showed that the von-Mises stress of a cannulated screw was larger than that of a solid screw in all loading conditions, especially above 2 mm in cannulated core diameter...
August 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28806960/16-channel-biphasic-current-mode-programmable-charge-balanced-neural-stimulation
#2
Xiaoran Li, Shunan Zhong, James Morizio
BACKGROUND: Neural stimulation is an important method used to activate or inhibit action potentials of the neuronal anatomical targets found in the brain, central nerve and peripheral nerve. The neural stimulator system produces biphasic pulses that deliver balanced charge into tissue from single or multichannel electrodes. The timing and amplitude of these biphasic pulses are precisely controlled by the neural stimulator software or imbedded algorithms. Amplitude mismatch between the anodic current and cathodic current of the biphasic pulse will cause permanently damage for the neural tissues...
August 14, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28800744/physiological-artifacts-in-scalp-eeg-and-ear-eeg
#3
Simon L Kappel, David Looney, Danilo P Mandic, Preben Kidmose
BACKGROUND: A problem inherent to recording EEG is the interference arising from noise and artifacts. While in a laboratory environment, artifacts and interference can, to a large extent, be avoided or controlled, in real-life scenarios this is a challenge. Ear-EEG is a concept where EEG is acquired from electrodes in the ear. METHODS: We present a characterization of physiological artifacts generated in a controlled environment for nine subjects. The influence of the artifacts was quantified in terms of the signal-to-noise ratio (SNR) deterioration of the auditory steady-state response...
August 11, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28789685/remote-monitoring-of-cardiorespiratory-signals-from-a-hovering-unmanned-aerial-vehicle
#4
Ali Al-Naji, Asanka G Perera, Javaan Chahl
BACKGROUND: Remote physiological measurement might be very useful for biomedical diagnostics and monitoring. This study presents an efficient method for remotely measuring heart rate and respiratory rate from video captured by a hovering unmanned aerial vehicle (UVA). The proposed method estimates heart rate and respiratory rate based on the acquired signals obtained from video-photoplethysmography that are synchronous with cardiorespiratory activity. METHODS: Since the PPG signal is highly affected by the noise variations (illumination variations, subject's motions and camera movement), we have used advanced signal processing techniques, including complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) and canonical correlation analysis (CCA) to remove noise under these assumptions...
August 8, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28789661/reference-free-determination-of-tissue-absorption-coefficient-by-modulation-transfer-function-characterization-in-spatial-frequency-domain
#5
Weiting Chen, Huijuan Zhao, Tongxin Li, Panpan Yan, Kuanxin Zhao, Caixia Qi, Feng Gao
BACKGROUND: Spatial frequency domain (SFD) measurement allows rapid and non-contact wide-field imaging of the tissue optical properties, thus has become a potential tool for assessing physiological parameters and therapeutic responses during photodynamic therapy of skin diseases. The conventional SFD measurement requires a reference measurement within the same experimental scenario as that for a test one to calibrate mismatch between the real measurements and the model predictions. Due to the individual physical and geometrical differences among different tissues, organs and patients, an ideal reference measurement might be unavailable in clinical trials...
August 8, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28789655/efficacy-and-safety-of-a-new-elastic-tourniquet-cuff-in-total-knee-arthroplasty-a-prospective-randomized-controlled-study
#6
O-Sung Lee, Myung Chul Lee, Hyuk-Soo Han
BACKGROUND: The effects of cuff shape, timing of tourniquet application, and automated systems using limb occlusion pressure (LOP) have been reported to minimize the appropriate tourniquet pressure. However, studies on the raw material of the cuff itself to reduce the complications related to the tourniquet have been very rarely reported. The purpose of this study is to report the efficacy and safety of a tourniquet system with a new elastic cuff in which pressure is set with LOP in total knee arthroplasty (TKA)...
August 8, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28789651/effect-of-athletic-fatigue-damage-and-the-associated-bone-targeted-remodeling-in-the-rat-ulna
#7
Li Hao, Li Rui-Xin, Han Biao, Zhao Bin, Hao Bao-Hui, Liu Ying-Jie, Zhang Xi-Zheng
BACKGROUND: Fatigue damage of the long bones is prevalent in running athletes and military recruits due to vigorous mid- and long-term physical activity. The current study attempted to know the features of bony athletic fatigue damage and to explore the mechanism of fatigue damage repair through bone targeted remodeling process. METHODS: Right ulnae of the Wistar rats were fatigue loaded on an INSTRON 5865 to construct the athletic fatigue damage model, and several time points (i...
August 8, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28774336/damping-ratio-analysis-of-tooth-stability-under-various-simulated-degrees-of-vertical-alveolar-bone-loss-and-different-root-types
#8
Kuo-Ning Ho, Sheng-Yang Lee, Haw-Ming Huang
BACKGROUND: The purpose of this study was to evaluate the feasibility of using damping ratio (DR) analysis combined with resonance frequency (RF) and periotest (PTV) analyses to provide additional information about natural tooth stability under various simulated degrees of alveolar vertical bone loss and various root types. METHODS: Three experimental tooth models, including upper central incisor, upper first premolar, and upper first molar were fabricated using Ti6Al4V alloy...
August 3, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28774311/design-and-implementation-of-a-bsn-based-system-for-plantar-health-evaluation-with-exercise-load-quantification
#9
Yang Wang, Zhiwen Liu, Jian Yang, Shaodong Ma
BACKGROUND: Plantar pressure measurement has become increasingly useful in the evaluation of plantar health conditions thanks to the recent progression in sensing technology. Due to the large volume and high energy consumption of monitoring devices, traditional systems for plantar pressure measurement are only focused on static or short-term dynamic monitoring. It makes them inappropriate for early detections of plantar symptoms usually presented in long-term activities. METHODS: A prototype of monitoring system based on body sensor network (BSN) is proposed for quantitative assessment of plantar conditions...
August 3, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28768540/in-vivo-and-in-vitro-performance-of-a-china-made-hemodialysis-machine-a-multi-center-prospective-controlled-study
#10
Yong Wang, Xiang-Mei Chen, Guang-Yan Cai, Wen-Ge Li, Ai-Hua Zhang, Li-Rong Hao, Ming Shi, Rong Wang, Hong-Li Jiang, Hui-Min Luo, Dong Zhang, Xue-Feng Sun
OBJECTIVE: To evaluate the in vivo and in vitro performance of a China-made dialysis machine (SWS-4000). METHODS: This was a multi-center prospective controlled study consisting of both long-term in vitro evaluations and cross-over in vivo tests in 132 patients. The China-made SWS-4000 dialysis machine was compared with a German-made dialysis machine (Fresenius 4008) with regard to Kt/V values, URR values, and dialysis-related adverse reactions in patients on maintenance hemodialysis, as well as the ultrafiltration rate, the concentration of electrolytes in the proportioned dialysate, the rate of heparin injection, the flow rate of the blood pump, and the rate of malfunction...
August 2, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28768507/book-review-further-understanding-of-the-human-machine-the-road-to-bioengineering
#11
Alvin Wald
Max E. Valentinuzzi (editor) Further understanding of the human machine. The road to bioengineering Series on bioengineering and biomedical engineering, volume 7.Singapore/New Jersey: World Scientific Publishing Co. Pte. Ltd.pp. xxxi+546. ISBN 9789813147256.
August 2, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28764713/non-iterative-geometric-approach-for-inverse-kinematics-of-redundant-lead-module-in-a-radiosurgical-snake-like-robot
#12
Olatunji Mumini Omisore, Shipeng Han, Lingxue Ren, Nannan Zhang, Kamen Ivanov, Ahmed Elazab, Lei Wang
BACKGROUND: Snake-like robot is an emerging form of serial-link manipulator with the morphologic design of biological snakes. The redundant robot can be used to assist medical experts in accessing internal organs with minimal or no invasion. Several snake-like robotic designs have been proposed for minimal invasive surgery, however, the few that were developed are yet to be fully explored for clinical procedures. This is due to lack of capability for full-fledged spatial navigation. In rare cases where such snake-like designs are spatially flexible, there exists no inverse kinematics (IK) solution with both precise control and fast response...
August 1, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28764711/video-tactile-pneumatic-sensor-for-soft-tissue-elastic-modulus-estimation
#13
M M Gubenko, A V Morozov, A N Lyubicheva, I G Goryacheva, M Z Dosaev, M-Sh Ju, Ch-H Yeh, F-Ch Su
BACKGROUND: A new sensor for estimating elasticity of soft tissues such as a liver was developed for minimally invasive surgery application. METHODS: By measuring deformation and adjusting internal pressure of the pneumatic sensor head, the sensor can be used to do palpation (indentation) of tissues with wide range of stiffness. A video camera installed within the sensor shell is used to register the radius of the contact area. Based on finite element model simulations and the measured data, elastic modulus of the indented soft tissue can be calculated...
August 1, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28755660/computational-and-experimental-assessment-of-influences-of-hemodynamic-shear-stress-on-carotid-plaque
#14
Hui Zhou, Long Meng, Wei Zhou, Lin Xin, Xiangxiang Xia, Shuai Li, Hairong Zheng, Lili Niu
BACKGROUND: Studies have identified hemodynamic shear stress as an important determinant of endothelial function and atherosclerosis. In this study, we assess the influences of hemodynamic shear stress on carotid plaques. METHODS: Carotid stenosis phantoms with three severity (30, 50, 70%) were made from 10% polyvinyl alcohol (PVA) cryogel. The phantoms were placed in a pulsatile flow loop with the same systolic/diastolic phase (35/65) and inlet flow rate (16 L/h)...
July 29, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28743262/the-effects-of-semantic-congruency-a-research-of-audiovisual-p300-speller
#15
Yong Cao, Xingwei An, Yufeng Ke, Jin Jiang, Hanjun Yang, Yuqian Chen, Xuejun Jiao, Hongzhi Qi, Dong Ming
BACKGROUND: Over the past few decades, there have been many studies of aspects of brain-computer interface (BCI). Of particular interests are event-related potential (ERP)-based BCI spellers that aim at helping mental typewriting. Nowadays, audiovisual unimodal stimuli based BCI systems have attracted much attention from researchers, and most of the existing studies of audiovisual BCIs were based on semantic incongruent stimuli paradigm. However, no related studies had reported that whether there is difference of system performance or participant comfort between BCI based on semantic congruent paradigm and that based on semantic incongruent paradigm...
July 25, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28705250/effect-of-manufacturing-and-experimental-conditions-on-the-mechanical-and-surface-properties-of-silicone-elastomer-scaffolds-used-in-endothelial-mechanobiological-studies
#16
Marc-Antoine Campeau, Audrey Lortie, Pierrick Tremblay, Marc-Olivier Béliveau, Dominic Dubé, Ève Langelier, Léonie Rouleau
BACKGROUND: Mechanobiological studies allow the characterization of cell response to mechanical stresses. Cells need to be supported by a material with properties similar to the physiological environment. Silicone elastomers have been used to produce various in vitro scaffolds of different geometries for endothelial cell studies given its relevant mechanical, optical and surface properties. However, obtaining defined and repeatable properties is a challenge as depending on the different manufacturing and processing steps, mechanical and surface properties may vary significantly between research groups...
July 14, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28679415/classification-of-caesarean-section-and-normal-vaginal-deliveries-using-foetal-heart-rate-signals-and-advanced-machine-learning-algorithms
#17
Paul Fergus, Abir Hussain, Dhiya Al-Jumeily, De-Shuang Huang, Nizar Bouguila
BACKGROUND: Visual inspection of cardiotocography traces by obstetricians and midwives is the gold standard for monitoring the wellbeing of the foetus during antenatal care. However, inter- and intra-observer variability is high with only a 30% positive predictive value for the classification of pathological outcomes. This has a significant negative impact on the perinatal foetus and often results in cardio-pulmonary arrest, brain and vital organ damage, cerebral palsy, hearing, visual and cognitive defects and in severe cases, death...
July 6, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28676056/investigation-of-implantable-signal-transmission-characteristics-based-on-visible-data-of-the-human-leg
#18
Yue-Ming Gao, Yan-Ting Ye, Shi Lin, Željka Lučev Vasić, Mang-I Vai, Min Du, Mario Cifrek, Sio-Hang Pun
BACKGROUND: Signal transmission characteristics between implanted medical devices and external equipment has been a common key issue, as has the problem of supplying energy to the devices. It can be used to enable signal transmission from implanted devices that the human body's conductive properties. Using signal transmission by galvanic coupling is one of the most effective signal transmission methods. METHODS: The signal transmission characteristics by galvanic coupling of implantable devices using a frequency range of 10 kHz to 1 MHz was analyzed in this article...
July 4, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28659191/an-ultrasound-transient-elastography-system-with-coded-excitation
#19
Xianfen Diao, Jing Zhu, Xiaonian He, Xin Chen, Xinyu Zhang, Siping Chen, Weixiang Liu
BACKGROUND: Ultrasound transient elastography technology has found its place in elastography because it is safe and easy to operate. However, it's application in deep tissue is limited. The aim of this study is to design an ultrasound transient elastography system with coded excitation to obtain greater detection depth. METHODS: The ultrasound transient elastography system requires tissue vibration to be strictly synchronous with ultrasound detection. Therefore, an ultrasound transient elastography system with coded excitation was designed...
June 28, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28655316/reconstruction-of-fluorescence-molecular-tomography-with-a-cosinoidal-level-set-method
#20
Xuanxuan Zhang, Xu Cao, Shouping Zhu
BACKGROUND: Implicit shape-based reconstruction method in fluorescence molecular tomography (FMT) is capable of achieving higher image clarity than image-based reconstruction method. However, the implicit shape method suffers from a low convergence speed and performs unstably due to the utilization of gradient-based optimization methods. Moreover, the implicit shape method requires priori information about the number of targets. METHODS: A shape-based reconstruction scheme of FMT with a cosinoidal level set method is proposed in this paper...
June 27, 2017: Biomedical Engineering Online
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