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Biomedizinische Technik. Biomedical Engineering

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https://www.readbyqxmd.com/read/27898396/computation-of-spatio-temporal-parameters-in-level-walking-using-a-single-inertial-system-in-lean-and-obese-adolescents
#1
Veronica Cimolin, Paolo Capodaglio, Nicola Cau, Manuela Galli, Cristina Santovito, Alessandra Patrizi, Gabriella Tringali, Alessandro Sartorio
In recent years, the availability of low-cost equipment capable of recording kinematic data during walking has facilitated the outdoor assessment of gait parameters, thus overcoming the limitations of three-dimensional instrumented gait analysis (3D-GA). The aim of this study is twofold: firstly, to investigate whether a single sensor on the lower trunk could provide valid spatio-temporal parameters in level walking in normal-weight and obese adolescents compared to instrumented gait analysis (GA); secondly, to investigate whether the inertial sensor is capable of capturing the spatio-temporal features of obese adolescent gait...
November 29, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27865091/analysis-of-voluntary-opening-ottobock-hook-and-hosmer-hook-for-upper-limb-prosthetics-a-preliminary-study
#2
Nur Afiqah Hashim, Nasrul Anuar Bin Abd Razak, Hossein Gholizadeh, Noor Azuan Abu Osman
There are a number of prosthetic terminal devices which offer functional restoration to individuals with upper limb deficiencies. Hosmer and Ottobock are major commercial hook providers for prosthetic terminal devices. The concern of this paper is to analyse the voluntary opening (VO) Ottobock model 10A18 and Hosmer model 99P hooks (one band) during opening operation and to find out favourable features in the design. Two tests were conducted to analyse the performance of both hooks. The first test used a simple bench tool to investigate cable excursion and hook opening angle and the second test used force sensor to find out the force supplied at a different hook opening angle...
November 19, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27861137/computer-assisted-system-on-mandibular-canal-detection
#3
Da-Chuan Cheng, Li-Wei Chen, Yen-Wen Shen, Lih-Jyh Fuh
BACKGROUND: A dentist always checks a patient by using panoramic radiography (PR) initially. The measurement of the minimal distance (MD) between the alveolar crest and the mandibular canal (MC) superior border is critically important before the dental implant surgery, extraction of 3rd molar teeth or any surgery in the posterior area of minimal distance (MD). However, the image of MC is not always clear to identify. OBJECTIVE: A software is needed for training dentists as well as a tool of demonstration to patients in clinics precisely and quickly...
November 18, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27855113/comparison-of-novel-physiological-load-adaptive-control-strategies-for-ventricular-assist-devices
#4
Moriz Habigt, Maike Ketelhut, Jonas Gesenhues, Frank Schrödel, Marc Hein, Mare Mechelinck, Thomas Schmitz-Rode, Dirk Abel, Rolf Rossaint
Terminal heart failure (HF) is the most prevalent cause of death in the Western world and the implantation of a left ventricular assist device (LVAD) has become the gold standard therapy today. Most of the actually implanted devices are driven at a constant speed (CS) regardless of the patient's physiological demand. A new physiological controller [power ratio (PR) controller], which keeps a constant ratio between LVAD power and left ventricular power, a previous concept [preload responsive speed (PRS) controller], which adds a variable LVAD power to reach a defined stroke work, and a CS controller were compared with an unimpaired ventricle in a full heart computer simulation model...
November 17, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27831915/effect-of-steroidal-saponins-loaded-nano-bioglass-phosphatidylserine-collagen-bone-substitute-on-bone-healing
#5
Chunrong Yang, Huazhong Wu, Jianhua Wang
The objective of this study was to investigate the therapeutic potential of nano-bioglass/phosphatidylserine/collagen (nBG/PS/COL) scaffolds loaded with steroidal saponins as an inducer factor for skeletal defects. The drugs-encapsulated bone substitute was prepared by loading steroidal saponins-collagen microsphere suspension in nano-bioglass and phosphatidylserine (PS) composite. The scaffolds possess an interconnected porous structure with a porosity of about 82.3%. The pore size ranges from several micrometers up to about 400 μm...
November 10, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27824610/a-rapid-approach-to-assess-cardiac-contractility-by-ballistocardiogram-and-electrocardiogram
#6
Xianwen Zhang, Liyan Zhang, Kun Wang, Chao Yu, Tiangang Zhu, Jintian Tang
In this paper, we propose a rapid assessment on cardiac contractility by using the time interval between the I wave of ballistocardiogram (BCG) and the R wave of electrocardiogram (ECG) which is referred to as the RI interval. The whole work can be divided into two parts. First, the correlation between the RI interval and the ejection fraction (EF), which is a clinical index to assess systolic performance, was computed. For 39 subjects, the correlation coefficient is -0.54 (p<0.001). Moreover, RI intervals of heart failure (HF) patients and healthy subjects were measured, and a significant difference was found among different New York Heart Association (NYHA) classes and the healthy group...
November 8, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27811342/model-based-glycaemic-control-methodology-and-initial-results-from-neonatal-intensive-care
#7
Jennifer L Dickson, J Geoffrey Chase, Adrienne Lynn, Geoffrey M Shaw
Very/extremely premature infants often experience glycaemic dysregulation, resulting in abnormally elevated (hyperglycaemia) or low (hypoglycaemia) blood glucose (BG) concentrations, due to prematurity, stress, and illness. STAR-GRYPHON is a computerised protocol that utilises a model-based insulin sensitivity parameter to directly tailor therapy for individual patients and their changing conditions, unlike other common insulin protocols in this cohort. From January 2013 to January 2015, 13 patients totalling 16 hyperglycaemic control episodes received insulin under STAR-GRYPHON...
November 3, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27740912/in-vitro-stent-assessment-by-mri-visibility-of-lumen-and-artifacts-for-27-modern-stents
#8
Andreas Heinrich, Felix V Güttler, Florian Schlesies, René Aschenbach, Niklas Eckardt, Ulf K-M Teichgräber
PURPOSE: The purpose of this study was to measure artifacts and visibility of lumen for modern and most commonly used stents in vascular interventions according to a standardized test method of the American Society for Testing and Materials (ASTM). MATERIALS AND METHODS: Twenty-four peripheral self-expanding nitinol stents and three stainless steel stents with diameters between 5 and 8 mm and lengths between 30 and 250 mm from seven different manufacturers were compared on a 1...
October 14, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27718479/fabrication-of-multifunctional-cap-tc-composite-coatings-and-the-corrosion-protection-they-provide-for-magnesium-alloys
#9
Cui Tan, Xiaoxu Zhang, Qing Li
Two major problems with magnesium (Mg) alloy biomaterials are the poor corrosion resistance and infection associated with implantation. In this study, a novel calcium phosphate (CaP)/tetracycline (TC) composite coating for Mg implants that can both improve the corrosion resistance of Mg and release a drug in a durable way is reported. Scanning electron microscope (SEM) images showed that TC additives make the CaP coating more compact and uniform. Electrochemical tests indicated CaP/TC coatings can provide excellent corrosion protection for Mg alloy substrates...
October 8, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27718478/an-experimental-study-of-shear-dependent-human-platelet-adhesion-and-underlying-protein-binding-mechanisms-in-a-cylindrical-couette-system
#10
Linda Tran, Khosrow Mottaghy, Sabine Arlt-Körfer, Christian Waluga, Mehdi Behbahani
Undesirable thrombotic reactions count among the most frequent and serious complications for patients who rely on the use of medical devices. To improve the design of medical devices, it is essential to develop a more precise understanding of platelet reactions. Clinical studies and experiments have shown a strong dependence of platelet deposition behavior on the flow. However, today the influence of hemodynamic parameters such as the shear rate on thrombotic reactions is not well understood. For the study of the shear-dependent mechanisms leading to the activation, adhesion and aggregation of platelets, a Couette flow system was used to investigate thrombocyte behavior with regard to well-defined flow conditions at shear-rate values between γ˙=400 $\dot \gamma = {\rm{400}}$ and 1400 1/s...
October 8, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27701132/automated-bioreactor-system-for-cartilage-tissue-engineering-of-human-primary-nasal-septal-chondrocytes
#11
Sascha Princz, Ulla Wenzel, Hanna Tritschler, Silke Schwarz, Christian Dettmann, Nicole Rotter, Martin Hessling
An automated bioreactor system for three-dimensional (3D) cultivation of facial cartilage replacement matrices (e.g. whole human auricles) with automatised medium exchange, gas flow and temperature control was developed. The measurement of O2 saturation and pH value in the medium was performed with a non-invasive optical method. The whole system can be observed via remote monitoring worldwide. First results demonstrated that the complete system remained sterile throughout a period of 42 days. Human chondrocytes migrated into the employed cartilage replacement matrix consisting of decellularised porcine nasoseptal cartilage (pNSC)...
October 4, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27658127/hybrid-textile-heart-valve-prosthesis-preliminary-in-vitro-evaluation
#12
Antoine Vaesken, Christian Pidancier, Nabil Chakfe, Frederic Heim
Transcatheter aortic valve implantation (TAVI) is nowadays a popular alternative technique to surgical valve replacement for critical patients. Biological valve tissue has been used in these devices for over a decade now with over 100,000 implantations. However, material degradations due to crimping for catheter insertion purpose have been reported, and with only 6-year follow-up, no information is available about the long-term durability of biological tissue. Moreover, expensive biological tissue harvesting and chemical treatment procedures tend to promote the development of synthetic valve leaflet materials...
September 22, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27655447/quasi-periodic-fluctuation-in-donchin-s-speller-signals-and-its-potential-use-for-asynchronous-control
#13
Zheng Ma, Tianshuang Qiu
When we examine the event-related potential (ERP) responses of Donchin's brain-computer interface (BCI) speller, a type of quasi-periodic fluctuation (FLUC) overlapping with the ERP components can be observed; this fluctuation is traditionally treated as interference. However, if the FLUC is detectable in a working BCI, it can be used for asynchronous control, i.e. to indicate whether the BCI is under the control state (CS) or under the non-control idle state (NC). Asynchronous control is an important issue to address to enable BCI's practical use...
September 21, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27855114/biosignal-analysis
#14
Stephan Lau, Jens Haueisen
No abstract text is available yet for this article.
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27824611/uncoupling-of-cardiac-and-respiratory-rhythm-in-atrial-fibrillation
#15
Mirjana M Platiša, Tijana Bojić, Siniša U Pavlović, Nikola N Radovanović, Aleksandar Kalauzi
Rearranged origin of heart rhythm in patients with atrial fibrillation (AF) influences the regulation of the heart and consequently the respiratory rhythm, and the bidirectional interaction of these rhythms not documented. Hence, we examined coupling of the RR interval and the respiration (Resp) signal by coherence, Granger causality and the cross-sample entropy method of time series analysis in patients with AF and a healthy control group. In healthy subjects, the influence of respiration on cardiac rhythm was found as increased coherence at the breathing frequency (BF) range, significantly stronger interaction and synchrony from Resp to RR than from RR to Resp...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27743509/remote-vital-parameter-monitoring-in-neonatology-robust-unobtrusive-heart-rate-detection-in-a-realistic-clinical-scenario
#16
Nikolai Blanik, Konrad Heimann, Carina Pereira, Michael Paul, Vladimir Blazek, Boudewijn Venema, Thorsten Orlikowsky, Steffen Leonhardt
Vital parameter monitoring of term and preterm infants during incubator care with self-adhesive electrodes or sensors directly positioned on the skin [e.g. photoplethysmography (PPG) for oxygen saturation or electrocardiography (ECG)] is an essential part of daily routine care in neonatal intensive care units. For various reasons, this kind of monitoring contains a lot of stress for the infants. Therefore, there is a need to measure vital parameters (for instance respiration, temperature, pulse, oxygen saturation) without mechanical or conductive contact...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27107830/an-adaptive-delineator-for-photoplethysmography-waveforms
#17
Mohanalakshmi Soundararajan, Sivasubramanian Arunagiri, Swarnalatha Alagala
Photoplethysmography (PPG) waveforms are rich in cardiovascular information, and hence, their analysis is significant in the diagnosis and prevention of cardiovascular diseases (CVDs). The second derivative of photoplethysmography (SDPPG) analysis for the accurate detection of significant points in characterising the PPG waveform is challenging. In this paper, a SDPPG analysis algorithm is proposed based on a resampling technique which normalises the signal and ensures the presence of all significant points of interest in all its recurrences...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27023317/effect-of-toe-extension-on-emg-of-triceps-surae-muscles-during-isometric-dorsiflexion
#18
Ariba Siddiqi, Sridhar P Arjunan, Dinesh Kumar
The protocol for estimating force of contraction by triceps surae (TS) muscles requires the immobilization of the ankle during dorsiflexion and plantar flexion. However, large variability in the results has been observed. To identify the cause of this variability, experiments were conducted where ankle dorsiflexion force and electromyogram (EMG) of the TS were recorded under two conditions: (i) toes were strapped and (ii) toes were unstrapped, with all other conditions such as immobilization of the ankle remaining unchanged...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27010774/reliability-analysis-of-the-heart-autonomic-control-parameters-during-hemodialysis-sessions
#19
Débora Martins da Silva, Murilo Carneiro Macedo, Lucas Brasileiro Lemos, Fernando Costa Vieira, Uanderson Silva Pirôpo, Helder Brito Andrade, Niels Wessel, Rafael Pereira
The study of heart autonomic control (HAC) in patients with chronic kidney disease (CKD) undergoing dialysis treatment has been carried out, however, there are no studies reporting the reliability of measurements of HAC parameters involving the mentioned samples and conditions. The reliability of many HAC parameters was evaluated from patients with CKD during two sessions of hemodialysis. The successive R-R intervals were recorded during two sessions of hemodialysis from 14 CKD patients that were undergoing dialysis for at least 6 months and with no history of recurrent hypotensive events...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/26943590/differences-in-mean-arterial-pressure-of-young-and-elderly-people-measured-by-oscilometry-during-inflation-and-deflation-of-the-arm-cuff
#20
Vratislav Fabian, Jan Havlik, Jan Dvorak, Vaclav Kremen, Pavol Sajgalik, Valentin Bellamy, John A Schirger, Pavel Sovka, Bruce D Johnson
Systemic arterial blood pressure (BP) is one of the most important parameters of the cardiovascular system. An oscillometric NIBP monitor was specifically designed to measure oscillometric pulsations and mean arterial pressure (MAP) during inflation and deflation of the cuff. Nineteen healthy young (age 23.1±1.7 years; mean±SD) and 35 elderly (83.9±7.9 years; mean±SD) subjects were studied. Differential analysis of MAP during inflation and deflation show mean |ΔMAP|=2.9±2.6 mm Hg in the young group (mean±SD) and |ΔMAP|=6...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
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