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Biomedical Engineering Online

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https://read.qxmd.com/read/31096969/development-and-evaluation-of-a-jaw-tracking-system-for-mice-reconstruction-of-three-dimensional-movement-trajectories-on-an-arbitrary-point-on-the-mandible
#1
Emi Moriuchi, Ryo Hamanaka, Yoshiyuki Koga, Ayumi Fujishita, Tomoko Yoshimi, Go Yasuda, Haruka Kohara, Noriaki Yoshida
BACKGROUND: Mastication is one of the most fundamental functions for the conservation of life. The demand for devices for evaluating stomatognathic function, for instance, recording mandibular movements or masticatory muscle activities using animal models, has been increasing in recent years to elucidate neuromuscular control mechanisms of mastication and to investigate the etiology of oral motor disorders. To identify the fundamental characteristics of the jaw movements of mice, we developed a new device that reconstructs the three-dimensional (3D) movement trajectories on an arbitrary point on the mandible during mastication...
May 16, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31092260/a-multivariate-relationship-between-the-kinematic-and-clinical-parameters-of-knee-osteoarthritis-population
#2
Fatima Bensalma, Neila Mezghani, Youssef Ouakrim, Alexandre Fuentes, Manon Choinière, Nathalie J Bureau, Madelaine Durand, Nicola Hagemeister
BACKGROUND: Biomechanical and clinical parameters contribute very closely to functional evaluations of the knee joint. To better understand knee osteoarthritis joint function, the association between a set of knee biomechanical data and a set of clinical parameters of an osteoarthritis population (OA) is investigated in this study. METHODS: The biomechanical data used here are a set of characteristics derived from 3D knee kinematic patterns: flexion/extension, abduction/adduction, and tibial internal/external rotation measurements, all determined during gait recording...
May 15, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31088563/a-novel-vision-based-system-for-quantitative-analysis-of-abdominal-aortic-aneurysm-deformation
#3
Andrzej Polanczyk, Michal Podgorski, Maciej Polanczyk, Aleksandra Piechota-Polanczyk, Ludomir Stefanczyk, Michal Strzelecki
BACKGROUND: In clinical diagnostics, combination of different imaging techniques is applied to assess spatial configuration of the abdominal aortic aneurysm (AAA) and deformation of its wall. As deformation of aneurysm wall is crucial parameter in assessing wall rupture, we aimed to develop and validate a Non-Invasive Vision-Based System (NIVBS) for the analysis of 3D elastic artificial abdominal aortic models. 3D-printed elastic AAA models from four patients were applied for the reconstruction of real hemodynamic...
May 14, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31088462/the-usefulness-of-isometric-protocol-for-foot-flexors-and-extensors-in-assessing-the-effects-of-16-week-rehabilitation-regiment-in-poststroke-patients
#4
Ewa Chlebuś, Agnieszka Wareńczak, Margaret Miedzyblocki, Przemysław Lisiński
BACKGROUND: Ankle joint function in a paretic limb has a fundamental impact on mobility. Return of joint function is a measure of early poststroke physical rehabilitation. This study aims to assess the suitability of using the isometric protocol for objective evaluation of flexor and extensor muscle strength in the paretic limb of poststroke patients. METHODS: 34 patients (F: 9, M: 25) aged 51-79 years with hemiparesis following an acute ischemic stroke and 34 healthy controls were examined using the isometric protocol measured on the Biodex System® ...
May 14, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31072348/an-on-line-processing-strategy-for-head-movement-interferences-removal-of-dynamic-brain-electrical-impedance-tomography-based-on-wavelet-decomposition
#5
Ge Zhang, Weichen Li, Hang Ma, Xuechao Liu, Meng Dai, Canhua Xu, Haoting Li, Xiuzhen Dong, Xingwang Sun, Feng Fu
BACKGROUND: Head movement interferences are a common problem during prolonged dynamic brain electrical impedance tomography (EIT) clinical monitoring. Head movement interferences mainly originate from body movements of patients and nursing procedures performed by medical staff, etc. These body movements will lead to variation in boundary voltage signals, which affects image reconstruction. METHODS: This study employed a data preprocessing method based on wavelet decomposition to inhibit head movement interferences in brain EIT data...
May 9, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31068196/characterization-of-moderate-tendinopathy-in-ex-vivo-stress-deprived-rat-tail-tendons
#6
Leila Jafari, Martin Savard, Fernand Gobeil, Eve Langelier
BACKGROUND: Stress deprivation (SD) has frequently been used as a model to study tendinopathy. Most of these studies have investigated either short-term (early tendinopathy) or long-term SD (advanced tendinopathy), while the transient mid-term SD has been given less attention. Therefore, the main objective of this study was to characterize mid-term SD. METHODS: To this end, live, healthy rat tail tendons (RTTs) were harvested and cultured without mechanical stress and then were divided into five groups based on their culture time (fresh, 2-day SD, 4-day SD, 6-day SD, and 10-day SD)...
May 8, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31064354/would-a-thermal-sensor-improve-arm-motion-classification-accuracy-of-a-single-wrist-mounted-inertial-device
#7
Jordan Lui, Carlo Menon
BACKGROUND: Inertial Measurement Unit (IMU)-based wearable sensors have found common use to track arm activity in daily life. However, classifying a high number of arm motions with single IMU-based systems still remains a challenging task. This paper explores the possibility to increase the classification accuracy of these systems by incorporating a thermal sensor. Increasing the number of arm motions that can be classified is relevant to increasing applicability of single-device wearable systems for a variety of applications, including activity monitoring for athletes, gesture control for video games, and motion classification for physical rehabilitation patients...
May 7, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31060550/evaluation-of-needle-movement-effect-on-root-canal-irrigation-using-a-computational-fluid-dynamics-model
#8
Shanshan Hu, Lunliang Duan, Qianbing Wan, Jian Wang
BACKGROUND: Irrigation is considered to be a critical part of root canal treatment. However, little is known about the effect of needle movement on the irrigation process. Therefore, this study aimed to investigate the influence of the syringe and needle movement on root canal irrigation using a three-dimensional computational fluid dynamics (CFD) numerical model. METHODS: The CFD codes Flow-3D was adopted to simulate the root canal irrigation process with the syringe and needle moving up and down in motions at different amplitudes and frequencies...
May 6, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31053071/look-me-in-the-eye-evaluating-the-accuracy-of-smartphone-based-eye-tracking-for-potential-application-in-autism-spectrum-disorder-research
#9
Maximilian A R Strobl, Florian Lipsmeier, Liliana R Demenescu, Christian Gossens, Michael Lindemann, Maarten De Vos
BACKGROUND: Avoidance to look others in the eye is a characteristic symptom of Autism Spectrum Disorders (ASD), and it has been hypothesised that quantitative monitoring of gaze patterns could be useful to objectively evaluate treatments. However, tools to measure gaze behaviour on a regular basis at a manageable cost are missing. In this paper, we investigated whether a smartphone-based tool could address this problem. Specifically, we assessed the accuracy with which the phone-based, state-of-the-art eye-tracking algorithm iTracker can distinguish between gaze towards the eyes and the mouth of a face displayed on the smartphone screen...
May 3, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31023303/hydraulic-conductivity-and-low-density-lipoprotein-transport-of-the-venous-graft-wall-in-an-arterial-bypass
#10
Zhenze Wang, Ming Liu, Xiao Liu, Anqiang Sun, Yubo Fan, Xiaoyan Deng
BACKGROUND: Blood flow condition may have influence upon the hydraulic conductivity of venous graft (Lp,vein ) in an arterial bypass, then affecting the accumulation of low-density lipoproteins (LDLs) within the graft wall. To probe this possibility, we first measured in vitro the filtration rates of swine lateral saphenous vein segments under different flow rates, and the correlation of Lp,vein with wall shear stress (WSS) was then obtained. RESULTS: The experimental results showed that when WSS was very low, Lp,vein would increase drastically with WSS from 1...
April 25, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31018860/biomechanical-investigation-of-dynamic-hip-screw-and-wire-fixation-on-an-unstable-intertrochanteric-fracture
#11
Hsu-Fu Wu, Chih-Han Chang, Gwo-Jaw Wang, Kuo-An Lai, Chung-Hwan Chen
BACKGROUND: Although use of a dynamic hip screw (DHS) for stable intertrochanteric hip fracture fixation has been successfully applied in fracture healing for more than 20 years, DHS fixation on unstable intertrochanteric fractures still has a high failure rate, especially in patients with osteoporosis. Although the wire fixation is usually incorporated with orthopedic device to treat fracture, the wiring techniques are developed through experiences. Thus, this study is objective to investigate the biomechanical property of different wire fixation methods incorporated with DHS system to provide the lesser trochanter fragment stable fixation on osteoporotic TypeA2...
April 24, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31014339/cardiac-monitoring-of-dogs-via-smartphone-mechanocardiography-a-feasibility-study
#12
Olli Lahdenoja, Tero Hurnanen, Matti Kaisti, Juho Koskinen, Jarno Tuominen, Matti Vähä-Heikkilä, Laura Parikka, Maria Wiberg, Tero Koivisto, Mikko Pänkäälä
BACKGROUND: In the context of monitoring dogs, usually, accelerometers have been used to measure the dog's movement activity. Here, we study another application of the accelerometers (and gyroscopes)-seismocardiography (SCG) and gyrocardiography (GCG)-to monitor the dog's heart. Together, 3-axis SCG and 3-axis GCG constitute of 6-axis mechanocardiography (MCG), which is inbuilt to most modern smartphones. Thus, the objective of this study is to assess the feasibility of using a smartphone-only solution to studying dog's heart...
April 23, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/31014338/short-lag-spatial-coherence-imaging-using-minimum-variance-beamforming-on-dual-apertures
#13
Yanxing Qi, Yuanyuan Wang, Jinhua Yu, Yi Guo
BACKGROUND: Short-lag spatial coherence (SLSC) imaging, a newly proposed ultrasound imaging scheme, can offer a higher lesion detectability than conventional B-mode imaging. It requires a high focusing quality which can be satisfied by the synthetic aperture imaging mode. However, traditional nonadaptive synthesis for the SLSC still offers an unsatisfactory resolution. The spatial coherence estimation on the receive aperture cannot fully utilize the coherence information in two-dimensional (2D) echo data...
April 23, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30999918/a-concentric-tube-based-4-dof-puncturing-needle-with-a-novel-miniaturized-actuation-system-for-vitrectomy
#14
Muhammad Umar Farooq, Binxiang Xu, Seong Young Ko
BACKGROUND: Vitreoretinal surgeries require precise, dexterous, and steady instruments for operation in delicate parts of the eye. Robotics has presented solutions for many vitreoretinal surgical problems, but, in a few operations, the available tools are still not dexterous enough to carry out procedures with minimum trauma to patients. Vitrectomy is one of those procedures and requires some dexterous instruments to replace straight ones for better navigation to affected sides inside the eyeball...
April 18, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30991997/retraction-mechanics-of-finochietto-style-self-retaining-thoracic-retractors
#15
Guillaume Chanoit, Charles A Pell, Gil Bolotin, Gregory D Buckner, Jeffrey P Williams, Hugh C Crenshaw
OBJECTIVES: Analyze the mechanics of Finochietto-style retractors, including the responses of thoracic tissues during thoracotomy, with an emphasis on tissue trauma and means for its reduction. METHODS: Mechanical analyses of the retractor were performed, including analysis of deformation under load and kinematics of the crank mechanism. Thoracotomies in a porcine model were performed in anesthetized animals (7) and fresh cadavers (17) using an instrumented retractor...
April 16, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30961620/microneurography-as-a-tool-to-develop-decoding-algorithms-for-peripheral-neuro-controlled-hand-prostheses
#16
Francesco M Petrini, Alberto Mazzoni, Jacopo Rigosa, Federica Giambattistelli, Giuseppe Granata, Beatrice Barra, Alessandra Pampaloni, Eugenio Guglielmelli, Loredana Zollo, Marco Capogrosso, Silvestro Micera, Stanisa Raspopovic
BACKGROUND: The usability of dexterous hand prostheses is still hampered by the lack of natural and effective control strategies. A decoding strategy based on the processing of descending efferent neural signals recorded using peripheral neural interfaces could be a solution to such limitation. Unfortunately, this choice is still restrained by the reduced knowledge of the dynamics of human efferent signals recorded from the nerves and associated to hand movements. FINDINGS: To address this issue, in this work we acquired neural efferent activities from healthy subjects performing hand-related tasks using ultrasound-guided microneurography, a minimally invasive technique, which employs needles, inserted percutaneously, to record from nerve fibers...
April 8, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30961605/continuous-distraction-osteogenesis-device-with-maac-controller-for-mandibular-reconstruction-applications
#17
Shahrokh Hatefi, Milad Etemadi Sh, Yimesker Yihun, Roozbeh Mansouri, Alireza Akhlaghi
BACKGROUND: Distraction osteogenesis (DO) is a novel technique widely used in human body reconstruction. DO has got a significant role in maxillofacial reconstruction applications (MRA); through this method, bone defects and skeletal deformities in various cranio-maxillofacial areas could be reconstructed with superior results in comparison to conventional methods. Recent studies revealed in a DO solution, using an automatic continuous distractor could significantly improve the results while decreasing the existing issues...
April 8, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30947733/evaluation-of-corneal-elastic-modulus-based-on-corneal-visualization-scheimpflug-technology
#18
Xiao Qin, Lei Tian, Haixia Zhang, Xinyan Chen, Lin Li
BACKGROUND: Corneal biomechanical properties are important for the diagnosis of corneal diseases, individualized design and prognosis of corneal surgery. Clinical available devices such as Ocular Response Analyzer (ORA) and Corneal Visualization Scheimpflug Technology (Corvis ST) can provide corneal biomechanics related parameters, while corneal elastic modulus cannot be extracted directly from them at present. The aim of this study is to suggest a method to determine corneal elastic modulus based on the results of Corvis ST test according to Reissner's theory on the relation between stress and small displacement in shallow spherical shell...
April 4, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30940146/mechanical-analysis-of-a-novel-biodegradable-zinc-alloy-stent-based-on-a-degradation-model
#19
Kun Peng, Xinyang Cui, Aike Qiao, Yongliang Mu
BACKGROUND: Biodegradable stents display insufficient scaffold performance due to their poor Young's Modulus. In addition, the corresponding biodegradable materials harbor weakened structures during degradation processes. Consequently, such stents have not been extensively applied in clinical therapy. In this study, the scaffold performance of a patented stent and its ability to reshape damaged vessels during degradation process were evaluated. METHODS: A common stent was chosen as a control to assess the mechanical behavior of the patented stent...
April 2, 2019: Biomedical Engineering Online
https://read.qxmd.com/read/30940144/a-review-on-low-dimensional-physics-based-models-of-systemic-arteries-application-to-estimation-of-central-aortic-pressure
#20
REVIEW
Shuran Zhou, Lisheng Xu, Liling Hao, Hanguang Xiao, Yang Yao, Lin Qi, Yudong Yao
The physiological processes and mechanisms of an arterial system are complex and subtle. Physics-based models have been proven to be a very useful tool to simulate actual physiological behavior of the arteries. The current physics-based models include high-dimensional models (2D and 3D models) and low-dimensional models (0D, 1D and tube-load models). High-dimensional models can describe the local hemodynamic information of arteries in detail. With regard to an exact model of the whole arterial system, a high-dimensional model is computationally impracticable since the complex geometry, viscosity or elastic properties and complex vectorial output need to be provided...
April 2, 2019: Biomedical Engineering Online
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