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Biomedizinische Technik. Biomedical Engineering

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https://www.readbyqxmd.com/read/29161232/development-concepts-of-a-smart-cyber-operating-theater-scot-using-orin-technology
#1
Jun Okamoto, Ken Masamune, Hiroshi Iseki, Yoshihiro Muragaki
Currently, networking has not progressed in the treatment room. Almost every medical device in the treatment room operates as a stand-alone device. In this project, we aim to develop a networked operating room called "Smart Cyber Operating Theater (SCOT)". Medical devices are connected using Open Resource interface for the Network (ORiN) technology. In this paper, we describe the concept of the SCOT project. SCOT is integrated using the communication interface ORiN, which was originally developed for industry...
November 18, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29135451/software-design-and-implementation-concepts-for-an-interoperable-medical-communication-framework
#2
Andreas Besting, Sebastian Bürger, Martin Kasparick, Benjamin Strathen, Frank Portheine
The new IEEE 11073 service-oriented device connectivity (SDC) standard proposals for networked point-of-care and surgical devices constitutes the basis for improved interoperability due to its independence of vendors. To accelerate the distribution of the standard a reference implementation is indispensable. However, the implementation of such a framework has to overcome several non-trivial challenges. First, the high level of complexity of the underlying standard must be reflected in the software design. An efficient implementation has to consider the limited resources of the underlying hardware...
November 14, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29135450/influence-of-acquisition-frame-rate-and-video-compression-techniques-on-pulse-rate-variability-estimation-from-vppg-signal
#3
Luca Cerina, Luca Iozzia, Luca Mainardi
In this paper, common time- and frequency-domain variability indexes obtained by pulse rate variability (PRV) series extracted from video-photoplethysmographic signal (vPPG) were compared with heart rate variability (HRV) parameters calculated from synchronized ECG signals. The dual focus of this study was to analyze the effect of different video acquisition frame-rates starting from 60 frames-per-second (fps) down to 7.5 fps and different video compression techniques using both lossless and lossy codecs on PRV parameters estimation...
November 14, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29095692/long-term-recording-of-electromyographic-activity-from-multiple-muscles-to-monitor-physical-activity-of-participants-with-or-without-a-neurological-disorder
#4
Katie Gant, Jorge Bohorquez, Christine K Thomas
Various portable monitors have been used to quantify physical activity but most rely on detecting limb movement with a sensor rather than measuring muscle activity. Our first goal was to design and validate a portable system for recording surface electromyographic activity (EMG) from eight muscles over 24 h. The modular system includes: (1) preamplifiers that filter and amplify signals; (2) a preprocessor unit for further filtering and amplification, signal offset and power supply modification; (3) a data-logger for analog-to-digital conversion; a flash memory card for data storage and (4) a rechargeable battery...
November 2, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29095691/biomechanical-investigation-of-different-surgical-strategies-for-the-treatment-of-rib-fractures-using-a-three-dimensional-human-respiratory-model
#5
Kao-Shang Shih, Thanh An Truong, Ching-Chi Hsu, Sheng-Mou Hou
Rib fracture is a common injury and can result in pain during respiration. Conservative treatment of rib fracture is applied via mechanical ventilation. However, ventilator-associated complications frequently occur. Surgical fixation is another approach to treat rib fractures. Unfortunately, this surgical treatment is still not completely defined. Past studies have evaluated the biomechanics of the rib cage during respiration using a finite element method, but only intact conditions were modelled. Thus, the purpose of this study was to develop a realistic numerical model of the human rib cage and to analyse the biomechanical performance of intact, injured and treated rib cages...
November 2, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29087952/or-net-rt-how-service-oriented-medical-device-architecture-meets-real-time-communication
#6
Jonas H Pfeiffer, Martin Kasparick, Benjamin Strathen, Christian Dietz, Max E Dingler, Tim C Lueth, Dirk Timmermann, Klaus Radermacher, Frank Golatowski
Today's landscape of medical devices is dominated by stand-alone systems and proprietary interfaces lacking cross-vendor interoperability. This complicates or even impedes the innovation of novel, intelligent assistance systems relying on the collaboration of medical devices. Emerging approaches use the service-oriented architecture (SOA) paradigm based on Internet protocol (IP) to enable communication between medical devices. While this works well for scenarios with no or only soft timing constraints, the underlying best-effort communication scheme is insufficient for time critical data...
October 31, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29087951/wheeze-sound-analysis-using-computer-based-techniques-a-systematic-review
#7
REVIEW
Fizza Ghulam Nabi, Kenneth Sundaraj, Lam Chee Kiang, Rajkumar Palaniappan, Sebastian Sundaraj
Wheezes are high pitched continuous respiratory acoustic sounds which are produced as a result of airway obstruction. Computer-based analyses of wheeze signals have been extensively used for parametric analysis, spectral analysis, identification of airway obstruction, feature extraction and diseases or pathology classification. While this area is currently an active field of research, the available literature has not yet been reviewed. This systematic review identified articles describing wheeze analyses using computer-based techniques on the SCOPUS, IEEE Xplore, ACM, PubMed and Springer and Elsevier electronic databases...
October 31, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29087950/sensitivity-enhancement-of-a-folded-beam-mems-capacitive-accelerometer-based-microphone-for-fully-implantable-hearing-application
#8
Apoorva Dwivedi, Gargi Khanna
The present work attempts to enhance the sensitivity of a folded beam microelectromechanical systems (MEMS) capacitive accelerometer by optimising the device geometry. The accelerometer is intended to serve as a microphone in the fully implantable hearing application which can be surgically implanted in the middle ear bone structure. For the efficient design of the accelerometer as a fully implantable biomedical device, the design parameters such as size, weight and resonant frequency have been considered. The geometrical parameters are varied to obtain the optimum sensitivity considering the design constraints and the stability of the structure...
October 31, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29055935/a-cost-sensitive-bayesian-combiner-for-reducing-false-positives-in-mammographic-mass-detection
#9
Ehsan Kozegar, Mohsen Soryani
Mammography is the most widely used modality for early breast cancer detection. This work proposes a new computer-aided mass detection approach, in which a denoising method called BM3D is first applied to mammograms. Afterwards, using an adaptive segmentation algorithm, images are segmented to suspicious regions of interest (ROIs) and then a classifier is used to understand the features of true positive (TP) and false positive (FP) patterns. In this way, from selected suspicious ROIs, fractal dimension, texture and intensity features are extracted...
October 23, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29040061/validation-of-a-novel-biomechanical-test-bench-for-the-knee-joint-with-six-degrees-of-freedom
#10
Christian H Heinrichs, Dominik Knierzinger, Hannes Stofferin, Werner Schmoelz
A novel biomechanical test bench has been developed for in-vitro evaluation of the knee joint. The test bench allows the kinematics of the knee joint to be studied in all six degrees of freedom. Flexion-extension knee movements are induced by quadriceps and hamstring muscle forces simulated by five pneumatic cylinders. The kinematics of the knee and the actively applied muscle forces are measured simultaneously. The aim of this study was to validate the sensitivity and reproducibility of this novel test bench...
October 17, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28981438/filtering-of-ecg-signals-distorted-by-magnetic-field-gradients-during-mri-using-non-linear-filters-and-higher-order-statistics
#11
Marcus Schmidt, Johannes W Krug, Michael N Rosenheimer, Georg Rose
The electrocardiogram (ECG) is the state-of-the-art signal for patient monitoring and gating in cardiovascular magnetic resonance (CMR) imaging applications. However, ECG signals are severely distorted during MRI scans due to the effects of static magnetic fields, radio frequency pulses and fast-switching gradient magnetic fields. Gradient-induced artifacts that cause high frequency peaks in the ECG signal especially hamper a correct and reliable QRS detection. To cope with this problem, a new median-based real-time gradient filter (M1) approach was developed...
October 10, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28915105/variations-of-ankle-foot-orthosis-constrained-movements-increase-ankle-range-of-movement-while-maintaining-power-output-of-recumbent-cycling
#12
Puteri N F Hamdan, Nur Azah Hamzaid, Juliana Usman, Md Anamul Islam, Victor S P Kean, Ahmad K Abdul Wahab, Nazirah Hasnan, Glen M Davis
Previous research investigated recumbent cycle power output (PO) from the perspective of knee and hip joint biomechanics. However, ankle-foot biomechanics and, in particular, the effect of ankle-foot orthosis (AFO)-constrained movements on cycle PO has not been widely explored. Therefore, the purpose of this study was to determine whether AFOs of a fixed position (FP) and in dorsi-plantarflexion (DPF)-, dorsiflexion (DF)- and plantarflexion (PF)-constrained movements might influence PO during voluntary recumbent cycling exercises...
September 15, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28850542/assessing-regional-lung-mechanics-by-combining-electrical-impedance-tomography-and-forced-oscillation-technique
#13
Chuong Ngo, Sarah Spagnesi, Carlos Munoz, Sylvia Lehmann, Thomas Vollmer, Berno Misgeld, Steffen Leonhardt
There is a lack of noninvasive pulmonary function tests which can assess regional information of the lungs. Electrical impedance tomography (EIT) is a radiation-free, non-invasive real-time imaging that provides regional information of ventilation volume regarding the measurement of electrical impedance distribution. Forced oscillation technique (FOT) is a pulmonary function test which is based on the measurement of respiratory mechanical impedance over a frequency range. In this article, we introduce a new measurement approach by combining FOT and EIT, named the oscillatory electrical impedance tomography (oEIT)...
August 29, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28981439/engineering-of-viable-implants
#14
EDITORIAL
Stefan Jockenhoevel
No abstract text is available yet for this article.
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28525361/engineering-of-biodegradable-magnesium-alloy-scaffolds-to-stabilize-biological-myocardial-grafts
#15
Tobias Schilling, Michael Bauer, Christian Biskup, Axel Haverich, Thomas Hassel
OBJECTIVE: Regenerative bioprostheses are being investigated for replacement of dysfunctional myocardium worldwide. The aim of this study was to develop a degradable magnesium structure to mechanically support the delicate biological grafts during the early remodeling phase. METHODS: Sheets of magnesium alloys (LA33, LA63 and AX30) were manufactured into scaffolds by abrasive water jet cutting. Thereafter, their surface properties, corrosion kinetics, and breakage behaviors were investigated...
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28453437/umbilical-cord-as-human-cell-source-for-mitral-valve-tissue-engineering-venous-vs-arterial-cells
#16
Axel Malischewski, Ricardo Moreira, Luis Hurtado, Valentine Gesché, Thomas Schmitz-Rode, Stefan Jockenhoevel, Petra Mela
Around 2% of the population in developed nations are affected by mitral valve disease and available valvular replacements are not designed for the atrioventricular position. Recently our group developed the first tissue-engineered heart valve (TEHV) specifically designed for the mitral position - the TexMi valve. The valve recapitulates the main components of the native valve, i.e. annulus, asymmetric leaflets and the crucial chordae tendineae. In the present study, we evaluated the human umbilical cord as a clinically applicable cell source for the TexMi valve...
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28076292/445-nm-diode-laser-assisted-debonding-of-self-ligating-ceramic-brackets
#17
Steffen Stein, Alexander Kleye, Michael Schauseil, Andreas Hellak, Heike Korbmacher-Steiner, Andreas Braun
OBJECTIVES: This study determined the influence of irradiation on aesthetic ceramic brackets with a novel 445-nm diode laser prior to debonding on the bracket failure mode. MATERIALS AND METHODS: Thirty ceramic brackets (In-Ovation® C, GAC) were standard-bonded to the oral and buccal planed and polished enamel surfaces of 15 caries-free human 3rd molars. Prior to study-blinded debonding, the brackets in the laser group were irradiated with the diode laser (SIROLaser Blue®, Sirona), while the irradiation was simulated within the conventional group...
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28076291/individual-construction-of-freeform-fabricated-polycaprolactone-scaffolds-for-osteogenesis
#18
Lu Liu, Guixin Shi, Ying Cui, Hui Li, Zhengchao Li, Qiangcheng Zeng, Yong Guo
The construction of engineered bone mostly focuses on simulating the extracellular matrix (ECM) for proper biological activity. However, the complexity of architecture and the variability of the mechanical properties of natural bones are related to individual differences in age, nutritional state, mechanical loading and disease status. Defect substitutions should be normed with the host natural bone, balancing architectural and mechanical adaption, as well as biological activity. Using a freeform fabrication (FFF) method, we prepared polycaprolactone (PCL) scaffolds with different architectures...
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28002026/validation-and-comparison-of-shank-and-lumbar-worn-imus-for-step-time-estimation
#19
William Johnston, Matthew Patterson, Niamh O'Mahony, Brian Caulfield
Gait assessment is frequently used as an outcome measure to determine changes in an individual's mobility and disease processes. Inertial measurement units (IMUs) are quickly becoming commonplace in gait analysis. The purpose of this study was to determine and compare the validity of shank and lumbar IMU mounting locations in the estimation of temporal gait features. Thirty-seven adults performed 20 walking trials each over a gold standard force platform while wearing shank and lumbar-mounted IMUs. Data from the IMUs were used to estimate step times using previously published algorithms and were compared with those derived from the force platform...
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27987353/a-seepage-outlet-boundary-condition-in-hemodynamics-modeling
#20
Fan He, Lu Hua, Li-Jian Gao
BACKGROUND: In computational fluid dynamics (CFD) models for hemodynamics applications, boundary conditions remain one of the major issues in obtaining accurate fluid flow predictions. OBJECTIVE: As an important part of the arterial circulation, microcirculation plays important roles in many aspects, such as substance exchange, interstitial fluid generation and inverse flow. It is necessary to consider microcirculation in hemodynamics modeling. This is a methodological paper to test and validate a new type of boundary condition never applied to microcirculation before...
October 26, 2017: Biomedizinische Technik. Biomedical Engineering
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