Biomedizinische Technik/Biomedical EngineeringThis is an RSS file. You can use it to subscribe to this data in your favourite RSS reader, such as GoogleReader, or to display this data on your own website or blog. Subscribe to this data using MyMedWorm.Subscribe to this data using GoogleReader.Subscribe to this data using Bloglines.Subscribe to this data using MyYahoo.

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Modeling and simulation of the cardiovascular system: a review of applications, methods, and potentials / Modellierung und Simulation des Herz-Kreislauf-Systems: ein Überblick zu Anwendungen, Methoden und PerspektivenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 233-244
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

Stand der Technik bei der Nieren- und Leberersatztherapie / Kidney and liver support therapies: state-of-the-art methodsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 245-254 Abstract Today, worldwide approximately 1.5 million uremic patients owe their lives to hemodialysis. This figure will increase further by a growth rate of 6% annually reflecting a necessary increasing high interest in innovative technologies as well as in individualized therapies in this area. The main focus of developmental efforts, today and in the future, is to adapt the therapy to the specific physiological conditions of kidney patients, e.g., by means of a precise control of body water and its removal. This can be precisely monitored by bioimpedance analys...
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

Assistierte Zirkulation: ein Überblick aus klinischer Sicht / Assisted circulation: an overview from a clinical perspectiveEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 255-267 Abstract A higher grade cardiac failure is associated with poor prognosis. In addition to medical conservative treatment and traditional cardiac surgery, in the past years different forms of an assisted circulation evolved. Short-term devices serve to bridge an acute life-threatening situation. The chosen system is dependent on the anticipated clinical course. It is possible to fall back on slightly assisting techniques up to a complete takeover of the cardiac pump function. In the case of severe cardiac failure, the question for transplantation has to be addre...
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

Methods of design, simulation, and control for the development of new VAD/TAH concepts / Methoden zur Konstruktion, Simulation und Regelung für die Entwicklung von neuen VAD/TAH-KonzeptenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 269-281
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

SmartCare®: Automatisierung klinischer Leitlinien / SmartCare®: automatizing clinical guidelinesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 283-288 Abstract In critical care environments, important medical and economic challenges are presented by the enhancement of therapeutic quality and the reduction of therapeutic costs. For this purpose, several clinical studies have demonstrated a positive impact of the adoption of so-called clinical guidelines. Clinical guidelines represent well documented best practices in healthcare and are fundamental aspects of evidence-based medicine. However, at the bedside, such clinical guidelines remain difficult to use by clinical staff. The knowledge-based technology Smart...
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

Regelungs- und Sicherheitskonzepte für extrakorporale Systeme zur Lungenunterstützung / Automatic control and safety concepts for extracorporeal lung supportEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 289-297 Abstract In some cases of severe acute respiratory distress syndrome, hypoxemia occurs despite optimized conservative therapy; however, extracorporeal membrane oxygenation (ECMO) can assure sufficient gas exchange. To increase safety and reliability of devices, the oxygenator design was optimized integrating new plasma-resistant composite membranes and new blood pumps are used with longer durability and reduced blood cell damage. Another approach is the use of an arterio-venous pumpless extracorporeal lung assist (pECLA) using an oxygenator with reduced pressur...
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

Blutdruckregelung im Umfeld chirurgischer Interventionen / Blood pressure control in the area of surgical interventionsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 299-306 Abstract For specific surgical interventions, such as aortic stent implantation, it might be temporarily necessary to decrease mean arterial pressure to rather low levels (around 40 mm Hg). Such hypotensive pressure levels are necessary to avoid intra- and postoperative intricacies. Traditionally, the drug Nitroprussidnatrium is used for this task. To adjust the correct amount of drug to reach the target pressure as fast as possible and without overshoot, the anaesthetists typically use empirical knowledge and might need several minutes until the target point ...
Source: Biomedizinische Technik/Biomedical Engineering - October 6, 2009 Category: Biomedical Engineering Source Type: journals

Smart Life Support: modellbasierte Entwicklung und Automatisierung von lebensunterstützenden Systemen / Smart life support: model-based design and control of life-supporting systemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (5): 229-231 No abstract available
Source: Biomedizinische Technik/Biomedical Engineering - October 1, 2009 Category: Biomedical Engineering Source Type: journals

Investigation of ventricular cerebrospinal fluid flow phase differences between the foramina of Monro and the aqueduct of Sylvius / Phasendifferenzen zwischen den Liquorströmungen im Aquädukt und in den Foramina MonroEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 161-169
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Non-invasive determination of instantaneous brachial blood flow using the oscillometric methodEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 171-177 Abstract The oscillometric method has been widely used to measure arterial systolic and diastolic blood pressures, but its potential for arterial blood flow measurements still remains to be explored. The aim of this study was to non-invasively determine arterial blood flow using an oscillometric blood flow measurement system. The system consists of a pneumatic elastic cuff, an air-pumping motor, a releaser valve, a pressure transducer, and an airflow meter. To build a non-linear cuff model, we measured airflow pumped into the pneumatic cuff and cuff pressure us...
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Direct measurement of myocardial oxygen tension and high energy phosphate content under varying ventilatory conditions in rabbits / Messung von myokardialem Sauerstoffpartialdruck und energiereichen Phosphaten unter verschiedenen Beatmungsbedingungen beim KaninchenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 179-186
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Simulations and experiments of the balloon dilatation of airway stenoses / Simulationen und Experimente zur Ballondilatation von AtemwegstenosenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 187-195
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Sympatho-vagale Balance und kardiale Reaktionen bei standardisierten psychomentalen Belastungen / Sympatho-vagal balance and cardiac response to mental challengeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Conclusions: We conclude that short-term recordings of HRV can provide health-related information of cardio-vascular response to mental challenge. However, there is no association between sympatho-vagal balance at rest and classical cardiovascular risk factors.
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Analysis of colour stability of selected provisional prosthetic materials: an in vitro studyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 205-210 Abstract Prosthetic restorative materials (that are) used for temporary fixed dentures tend to exhibit variable discolouration over several weeks of use. The aim of this study was to perform a spectrophotometric analysis of the influence of selected discolouring factors on the colour stability of provisional prosthetic materials in vitro. In the study, the following prosthetic materials for short-term use in the oral cavity were evaluated: Luxatemp, Structur 2S.C., Protemp II, Zhermacryl STC and Dentalon Plus. Samples of these materials were immersed in coffee,...
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Der Einfluss der Makro- und Mikrostruktur auf die Benetzungs- und Retentionseigenschaften von Wurzelkanalstiften in vitro / The influence of macro- and microstructure on the surface wettability and retention properties of endodontic posts in vitroEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 211-217 Abstract Esthetical and biomechanical requirements on fiber-reinforced endodontic posts play an important role in clinical application. Leading to a long-term clinical success, post systems must ensure an adequate force transmission and optimal retention behavior into the root channel. The aim of this study was to determine the microstructure and morphology of commonly used fiber reinforced endodontic posts in vitro. Post-specific fiber diameter, fiber arrangement over the cross-sections and length, and fiber-matrix ratio could be associated with mechanical pro...
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Pharmakafreisetzende biodegradierbare Polymerbeschichtung von dentalen Titanimplantaten zur Verbesserung der Weichgewebsintegration / Drug release of coated dental implant neck region to improve tissue integrationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 219-227 Abstract In order to improve tissue integration, the neck region of dental implants was coated with the biodegradable polymer poly (l-lactide) incorporating tetracycline, ibuprofen and the combination of both drugs using a solvent dip-coating process. Metallographic analysis, light microscopy and electron microscopy were used to detect the thickness range and the surface characteristics of the coatings. Cytotoxicity was evaluated using the tetrazolium colorimetric method with the fibroblast cell line L929. The in vitro drug release was measured in isotonic sodi...
Source: Biomedizinische Technik/Biomedical Engineering - August 6, 2009 Category: Biomedical Engineering Source Type: journals

Welcoming address to the participants of the World Congress on Medical Physics and Biomedical Engineering (Munich, Germany, September 7–12, 2009)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (4): 159-159 No abstract available
Source: Biomedizinische Technik/Biomedical Engineering - August 1, 2009 Category: Biomedical Engineering Source Type: journals

A two-class brain computer interface to freely navigate through virtual worlds / Ein Zwei-Klassen-Brain-Computer-Interface zur freien Navigation durch virtuelle WeltenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (3): 126-133
Source: Biomedizinische Technik/Biomedical Engineering - July 1, 2009 Category: Biomedical Engineering Source Type: journals

On the selection of the nozzle geometry and other parameters for cutting corneal flaps with waterjets / Düsengeometrie und andere Parameter beim Wasserstrahlschneiden von HornhautscheibenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (3): 134-141
Source: Biomedizinische Technik/Biomedical Engineering - July 1, 2009 Category: Biomedical Engineering Source Type: journals

Simulation of force loaded knee movement in a newly developed in vitro knee simulator / Simulation von belastungsabhängigen Kniebewegungen in einem neuartigen Knie-Simulator für In-vitro-StudienEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (3): 142-149
Source: Biomedizinische Technik/Biomedical Engineering - July 1, 2009 Category: Biomedical Engineering Source Type: journals

Biomechanische Studie zu vier winkelstabilen distalen palmaren Radiusplatten und einer nichtwinkelstabilen Radiusplatte: Steifigkeit und Versagenstests am Kadavermodell / Biomechanical study of four palmar locking plates and one non-locking palmar plate for distal radius fractures: stiffness and load to failure tests in a cadaver modelEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (3): 150-158 Abstract Five different palmar fixation plate designs were compared in a distal radial osteotomy cadaver model with regard to their biomechanical properties. A metaphyseal osteotomy gap of 1 cm was performed and the osteosynthesis was plated according to the manufacturer's instructions. Axial load was applied to the construct by a pneumatic material testing machine. Five implant groups with eight cadavers each were tested concerning stiffness. None of the constructs developed deformity and movement of the fracture gap larger than 2 mm with a load of 100 N. I...
Source: Biomedizinische Technik/Biomedical Engineering - July 1, 2009 Category: Biomedical Engineering Source Type: journals

Modeling of cardiac ischemia in human myocytes and tissue including spatiotemporal electrophysiological variations / Modellierung kardialer Ischämie in menschlichen Myozyten und GewebeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 54 (3): 107-125
Source: Biomedizinische Technik/Biomedical Engineering - June 1, 2009 Category: Biomedical Engineering Source Type: journals

Identifizieren von Patienten mit Vorhofflimmern anhand von HRV-Parametern / Identification of patients with atrial fibrillation using HRV parametersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 53(1): 8-15 Zusammenfassung Vorhofflimmern ist die häufigste und klinisch wichtigste Herzrhythmusstörung. Eine der bedrohlichsten Folgeerkrankungen ist der Schlaganfall. Um die Anzahl der Schlaganfälle zu reduzieren, müssen Vorhofflimmerpatienten sicher als solche identifiziert werden, um sie anschließend frühzeitig therapieren zu können. Grundlage für den hier vorgestellten Algorithmus bildet ein 60 Minuten langes Einkanal-EKG. Darin werden zunächst die R-Zacken detektiert und anschließend die RR-Abstände berechnet. Um die RR-Abstände pulsunabhängig zu erhalten,...
Source: Biomedizinische Technik/Biomedical Engineering - February 6, 2008 Category: Biomedical Engineering Authors: Nicole KikillusGerd HammerArmin Bolz Source Type: journals

Criteria for the multiple use of isolated perfused hearts in electrophysiological and metabolic experiments / Kriterien für die Mehrfachnutzung von isoliert perfundierten Schweineherzen für elektrophysiologische und metabolische UntersuchungenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 53(1): 16-24 Abstract Both ethical and economic restrictions limit the availability of porcine hearts for in vitro perfusion experiments. Therefore, we tested the feasibility of multiple use of in vitro perfused working hearts for electrophysiological and metabolic investigations. Pig hearts (n=7) rejected for originally planned haemodynamic measurements because of exclusion criteria were perfused in a four-chamber working heart mode. All hearts were kept in steady-state conditions on a low haemodynamic level over 2 h during 75-channel ECG recordings and NADH fluorescence mea...
Source: Biomedizinische Technik/Biomedical Engineering - February 6, 2008 Category: Biomedical Engineering Authors: Inga GrünwaldRomana M. StahnCarsten M. KindtLutz PfeiferRoland Hetzer Source Type: journals

Mother rotor anchoring in branching tissue with heterogeneous membrane properties / Ankern von mother rotors in verzweigtem Gewebe mit inhomogenen MembraneigenschaftenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this study a computer model of cardiac propagation was applied to investigate mechanisms leading to the formation and maintenance of such mother rotors. For this purpose, a region of short action potential duration was generated by varying the acetylcholine concentration across the tissue. A mother rotor initiated in the center of this region drifts away, and the activation terminates. If an additional heterogeneity such as a bundle is included into the model, a further drift mechanism directed to the bundle is observed and the rotor can be stabilized. Therefore, bundle insertions may play an important role in the maint...
Source: Biomedizinische Technik/Biomedical Engineering - February 6, 2008 Category: Biomedical Engineering Authors: Leonhard WieserClaudia N. NowakBernhard TilgGerald Fischer Source Type: journals

Development, set-up and first results for a one-channel near-infrared spectroscopy system / Entwicklung, Aufbau und vorläufige Ergebnisse eines Einkanal- Nahinfrarot-Spektroskopie-SystemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 53(1): 36-43 Abstract Near-infrared spectroscopy (NIRS) is a non-invasive optical technique that can be used to assess functional activity in the human brain. This work describes the set-up of a one-channel NIRS system designed for use as an optical brain-computer interface (BCI) and reports on first measurements of deoxyhemoglobin (Hb) and oxyhemoglobin (HbO2) changes during mental arithmetic tasks. We found relatively stable and reproducible hemodynamic responses in a group of 13 healthy subjects. Unexpected observations of a decrease in HbO2 and increase in Hb concentration...
Source: Biomedizinische Technik/Biomedical Engineering - February 6, 2008 Category: Biomedical Engineering Authors: Günther BauernfeindRobert LeebSelina Christin WriessneggerGert Pfurtscheller Source Type: journals

A simple video-based system for examining irregularities in very slow, smooth-pursuit eye movements in cancer patients / Ein einfaches Videosystem zur Untersuchung der Irregularitäten langsamer Augenfolgebewegungen bei KrebspatientenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 53(1): 1-7 Abstract Subjective observations made during routine examination of eye movement functions (orthoptic status) reveal that very slow, smooth-pursuit eye movements in cancer patients are irregular. To objectively measure such movements, a video-based system was built to allow analysis of very slow, smooth-pursuit eye movements (1.8°/s). Analysis involves quantification of drift and jerk-like gaze movements that cause deviations in gaze direction from the predicted trajectory. Gaze deviations observed in cancer patients are compared to those for the normal population....
Source: Biomedizinische Technik/Biomedical Engineering - February 1, 2008 Category: Biomedical Engineering Authors: Marino MenozziKaspar RhynerAlena JoestlHanspeter StähliEsther Bergande Source Type: journals

Image reconstruction in positron emission tomography (PET): the 90th anniversary of Radon's solution / Bildrekonstruktion in der Positronen-Emissions-Tomographie (PET): zum 90. Jahrestag von Radons LösungEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 361-364 Abstract This year is the 90th anniversary of Radon's solution of how the values of a function can be reconstructed from measured line integrals. In medical tomography, Radon's method allows the formation of cross-sectional images of a human's body from measurements outside the patient. This paper reviews the use of Radon's method in positron emission tomography (PET) and presents some future trends in PET.
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Authors: Ralph BrinksThorsten M. Buzug Source Type: journals

Registrierung von Aufnahmen des Augenhintergrundes zur Erstellung großflächiger Kompositionsaufnahmen / Registration of fundus images for generating wide field composite images of the retinaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 365-374 Zusammenfassung Die Zusammensetzung von Aufnahmen des menschlichen Augenhintergrundes zu Kompositionsbildern stellt hohe Anforderungen an die verwendeten Verfahren. Erhebliche Beleuchtungsunterschiede innerhalb und zwischen den Bildern, strukturlose Bereiche und nichtlineare Verzerrungen stellen hierbei die größten Probleme dar. Die vorliegende Arbeit präsentiert einen automatischen Algorithmus zur Registrierung von Fundusaufnahmen sowie deren Transformation und Überlagerung zu großflächigen Kompositionsaufnahmen. Das Verfahren nutzt dabei sowohl den fläc...
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Authors: Daniel BaumgartenAxel Doering Source Type: journals

ElePhant: ein anatomisch-elektronisches Simulationssystem für die Evaluation computerassistierter Eingriffe und die chirurgische Ausbildung / ElePhant: an anatomic-electronic simulation system for the evaluation of computer assisted interventions and surgical educationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 375-382 Zusammenfassung Hintergrund: Für die präklinische Evaluation von computerassistierten Eingriffen und die chirurgische Ausbildung unter realitätsnahen Bedingungen werden geeignete Simulationssysteme benötigt. Um objektive Aussagen über die Verletzungen von Risikostrukturen zu treffen, sind zweckmäßige Detektionsmechanismen erforderlich. Ziel der Arbeit war die technische Realisierung eines solchen anatomischen Simulationssystems am Beispiel des HNO-Eingriffs Mastoidektomie. Material und Methode: Die Grundlage bildet der CT-Datensatz eines Kadaver-Schädels...
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Authors: Hendrik MöckelRonny GrunertAntje PößneckMathias HoferMario ThalheimGero StraußUlrich FickweilerJürgen MeixensbergerAndreas DietzWerner Korb Source Type: journals

An easily reproducible and biomechanically standardized model to investigate bone healing in rats, using external fixation / Ein leicht reproduzierbares und biomechanisch standardisiertes Modell zur Untersuchung der Knochenheilung in der Ratte unter Verwendung eines Fixateur ExterneEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 383-390 Abstract We have established a new small animal model to investigate the process of bone regeneration. A total of 42 male Sprague-Dawley rats received an osteotomy of the left femur, stabilized with a custom-made external fixator. The fixation method was chosen to create an easily reproducible, biomechanically well-defined model with minimized interference of the implant with the healing zone. At 14 or 56 days post-operation, the animals were sacrificed and examined biomechanically, histologically and radiologically. Radiologically, the femurs of all animals we...
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Authors: Katharina KasparHanna SchellDaniel TobenGeorg MatziolisHermann J. Bail Source Type: journals

Steigerung der femuralen Knochen-Knochenzement-Verbundfestigkeit in der zementierten Revisionshüftendoprothetik durch einen amphiphilen Knochenhaftvermittler im dynamischen in-vitro Ausstoßversuch / Improvement of femoral bone-cement adhesion in cemented revision hip arthroplasty by application of an amphiphilic bonder in a dynamic femur expulsion testing in vitroEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 391-397 Zusammenfassung Zementierte Hüftprothesen-Revisionsschäfte zeigen reduzierte Standzeiten im Vergleich zu zementfreien Implantaten. In dieser Untersuchung soll der Nutzen eines amphiphilen Knochenhaftvermittlers zur Steigerung der Verbundfestigkeit im biomechanischen Femurausstoßversuch überprüft werden. Es wurde ein vereinfachter Prüfstandsversuch mit idealisierten Femurschaftprüfkörpern durchgeführt. Die Prüfkörper wurden in Rinderfemura [Gruppe 1: kein Knochenhaftvermittler (n=10), Gruppe 2: Knochenhaftvermittler mit Glutaraldehyd-Anteil (n=10), Gru...
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Authors: Ralf Müller-RathStefan AndereyaSascha GraviusDieter Christian WirtzRudolf MarxTorsten Mumme Source Type: journals

Reviewer acknowledgement Biomed Tech volume 52 (2007)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 399-399 No Abstract available
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Source Type: journals

Contents index Biomed Tech volume 52 (2007)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 401-403 No Abstract available
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Source Type: journals

Author index Biomed Tech volume 52 (2007)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(6): 405-406 No Abstract available
Source: Biomedizinische Technik/Biomedical Engineering - November 29, 2007 Category: Biomedical Engineering Source Type: journals

Computer-assisted evaluation of kinematics of the two bundles of the anterior cruciate ligament / Computer-assistierte Evaluation der Kinematik der beiden Bündel des VKBEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 316-322 The aim of this cadaveric study was to describe the kinematics of the anterior cruciate ligament (ACL)-intact, posterolateral (PL) bundle-deficient and ACL-deficient knee by applying a protocol for computer-assisted evaluation of knee kinematics. The hypothesis that the PL bundle functions mainly at low knee flexion angles was tested. An optical tracking system was used to acquire knee joint motion on 10 knees during clinical evaluations by tracking markers rigidly attached to the bones. The protocol included acquisition of anterior-posterior (AP) translations a...
Source: Biomedizinische Technik/Biomedical Engineering - October 4, 2007 Category: Biomedical Engineering Authors: Hanno SteckelPatricia E. MurthaRyan S. CosticJames E. MoodyBranislav JaramazFreddie H. Fu Source Type: journals

Das Verhältnis von Arbeitsraum zu Bauraum epizyklischer Kinematiken mit sechs Freiheitsgraden / The relation of workspace and installation space of epicyclic kinematics with six degrees of freedomEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 323-336 Hintergrund: Die Kinematik eines Roboters bestimmt maßgeblich seinen Arbeitsraum und den notwendigen Bauraum. Für den Einsatz robotischer Werkzeuge in der Medizin sind Maschinen mit möglichst kleinen Abmaßen von Vorteil. Material und Methode: In der vorliegenden Arbeit wurden sechs Varianten einer neuartigen epizyklischen 6-DOF-Kinematik zunächst hinsichtlich ihrer Funktionalität mit der Grübler-Formel untersucht. Anschließend wurden das Arbeitsraum-Bauraum-Verhältnis quantitativ sowie die Form der Arbeitsräume qualitativ mit Hilfe von mit Matlab erste...
Source: Biomedizinische Technik/Biomedical Engineering - October 4, 2007 Category: Biomedical Engineering Authors: Peter P. PottMarkus L.R. Schwarz Source Type: journals

Biomechanische Modellierung der Halswirbelsäule auf Basis tomografischer Bilddaten / Biomechanical modeling of the cervical spine on the basis of tomographic dataEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 337-345 In der Wirbelsäulenchirurgie haben sich in den letzten Jahren Navigationssysteme etabliert, die den Chirurgen intraoperativ unterstützen sollen, jedoch fehlt es bisher an entsprechend ausgereifter Software für die Planung im Vorfeld der Operation. Insbesondere wäre es für den Chirurgen wünschenswert, wenn er den Operationsverlauf simulieren und damit die Auswirkungen seines Handelns abschätzen könnte. Damit könnte für den Patienten eine Reduktion des Operationstraumas und eine optimierte postoperative Mobilität erreicht werden. Die Basis einer solchen...
Source: Biomedizinische Technik/Biomedical Engineering - October 4, 2007 Category: Biomedical Engineering Authors: Sascha SeifertRüdiger Dillmann Source Type: journals

Die Biegestabprothese: ein experimenteller Ansatz zur metaphysären Hüftendoprothetik / The bending rod prosthesis: an experimental approach to metaphyseal hip arthroplastyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 346-350 Ziel dieser Studie war die Entwicklung einer rein metaphysär verankernden Schenkelhalsprothese. Um auf eine Fixierung am Trochanter major zu verzichten, sollte die einfallende Kraft gleichmäßig an möglichst vielen Punkten übertragen werden. Mittels Computersimulation zeigte sich ein Implantat mit einem Zentralzylinder und 16 entlang einem Gewinde verlaufenden Prothesenstäben als geeignete Lösung. Zur Bestimmung der Primärstabilität wurden 14 frisch gefrorene Leichenfemura verwendet. Für die Implantation wurde ein spezielles Instrumentarium entwickelt, ...
Source: Biomedizinische Technik/Biomedical Engineering - October 4, 2007 Category: Biomedical Engineering Authors: Andreas FottnerFarhad MazoochianWolfgang PlitzChristoph von Schulze PellengahrChristoph BirkenmaierVolkmar Jansson Source Type: journals

Auflichtmikroskopische Untersuchungen an der Kaninchenkalotte nach ultraschallgestützter und konventioneller Osteotomie / Light microscopic examination of rabbit skulls following conventional and Piezosurgery® osteotomyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 351-355 Hintergrund: Das seit kurzem im klinischen Gebrauch befindliche ultraschallgestützte Osteotomieverfahren Piezosurgery®, stellt eine Alternative zu den konventionellen Verfahren der Osteotomie dar. Ziel der vorliegenden Studie war es, mittels auflichtmikroskopischer Untersuchungsmethoden einen morphologischen Vergleich konventioneller Osteotomiemethoden (Lindemannfräse und Mikrostichsäge) mit dem neuen, ultraschallgestützten Verfahren hinsichtlich der Oberflächenmorphologie durchzuführen. Material und Methode: Zwölf frisch euthanasierten Kaninchen wurden ...
Source: Biomedizinische Technik/Biomedical Engineering - October 4, 2007 Category: Biomedical Engineering Authors: Peter MaurerMarcus S. KriwalskyRafael Block VerasJörg BrandtChristian Heiss Source Type: journals

Sudden failure of implantable pulse generators: cause of failure and examination / Plötzlicher Ausfall von implantierbaren Stimulatoren: Ausfallsursache und ÜberprüfungEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 356-359 A sudden failure of implantable pulse generators used for spinal cord stimulation occurred in two patients. To identify the cause of this failure, an intensive destructive analysis of the explanted devices was carried out. A functional diagnosis was carried out by inspecting amplitude, pulse width and frequency on each output channel of the implantable pulse generators. Later, the titanium case of the pulse generators was opened by laser cutting to minimise any additional mechanical stress during the opening procedure. The functional test for both pulse generato...
Source: Biomedizinische Technik/Biomedical Engineering - October 4, 2007 Category: Biomedical Engineering Authors: Hermann LanmüllerJohanna BuchroithnerJohann WernischFrançois Alesch Source Type: journals

Wolfgang Niederlag joins the Associate Editor team of Biomedizinische Technik/Biomedical EngineeringEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(5): 315-315
Source: Biomedizinische Technik/Biomedical Engineering - October 1, 2007 Category: Biomedical Engineering Source Type: journals

Ultrasonographic contrast-agent imaging of sub-millimeter vessel structures with spatial compounding: in vitro analyses / Kontrastmittelgestützte Ultraschallabbildung von Sub-Millimeter-Gefäßstrukturen mittels Spatial Compounding: In-vitro AnalysenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(4): 274-283 In clinical diagnostics, ultrasonographic contrast-agent imaging gives access to medical parameters such as perfusion and vascularization. In addition to the artifacts that are typical for ultrasonic imaging, e.g., speckle noise and depth-dependent sensitivity and resolution, contrast-agent imaging shows more pronounced depth dependence and may suffer from shadowing artifacts that arise from high attenuation of the ultrasound waves by the contrast agent at high concentrations. By imaging an object from different viewing angles in one 2D image plane and summing t...
Source: Biomedizinische Technik/Biomedical Engineering - August 10, 2007 Category: Biomedical Engineering Authors: Christian HansenNils HüttebräukerWilko WilkeningMohammad AshfaqHelmut Ermert Source Type: journals

Modular optical topometric sensor for 3D acquisition of human body surfaces and long-term monitoring of variations / Ein modulares optisches topometrisches Messsystem für die Erfassung von Körperoberflächen und die Verfolgung von LangzeitänderungenEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(4): 284-289 Optical topometric 3D sensors such as laser scanners and fringe projection systems allow detailed digital acquisition of human body surfaces. For many medical applications, however, not only the current shape is important, but also its changes, e.g., in the course of surgical treatment. In such cases, time delays of several months between subsequent measurements frequently occur. A modular 3D coordinate measuring system based on the fringe projection technique is presented that allows 3D coordinate acquisition including calibrated color information, as well as t...
Source: Biomedizinische Technik/Biomedical Engineering - August 10, 2007 Category: Biomedical Engineering Authors: Guido BischoffZoltan BöröczChristian ProllJohannes KleinheinzGert von BallyDieter Dirksen Source Type: journals

Does a specific MR imaging protocol with a supine-lying subject replicate tarsal kinematics seen during upright standing? / Bildet ein spezifisches MR-Verfahren mit rücklings liegendem Probanden die tarsale Kinematik unter stehenden Bedingungen nach?Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(4): 290-294 Magnetic resonance (MR) imaging is becoming increasingly important in the study of foot biomechanics. Specific devices have been constructed to load and position the foot while the subject is lying supine in the scanner. The present study examines the efficacy of such a newly developed device in replicating tarsal kinematics seen during the more commonly studied standing loading conditions. The results showed that although knee flexion and the externally applied load were carefully controlled, subtalar and talo-navicular joint rotations while lying during MR ima...
Source: Biomedizinische Technik/Biomedical Engineering - August 10, 2007 Category: Biomedical Engineering Authors: Peter WolfAlex StacoffAnmin LiuAnton ArndtChris NesterArne LundbergEdgar Stuessi Source Type: journals

Measures for reducing ultra-high-molecular-weight polyethylene wear in total knee replacement: a simulator study / Reduzierter UHMWPE-Abrieb im Rahmen der Knieendoprothetik: eine SimulatorstudieEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In conclusion, the combination of design features and surface modifications of the BPK-S integration TKR system leads to low gravimetric UHMWPE wear.
Source: Biomedizinische Technik/Biomedical Engineering - August 10, 2007 Category: Biomedical Engineering Authors: Ralf Mueller-RathBernhard KleffnerStefan AndereyaTorsten MummeDieter Christian Wirtz Source Type: journals

Finite-Elemente-Analyse einer zementierten, keramischen Femurkomponente unter Berücksichtigung der Einbausituation bei künstlichem Kniegelenkersatz / Finite element analysis of a cemented ceramic femoral component for the assembly situation in total knee arthroplastyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(4): 301-307 In der Knieendoprothetik werden standardmäßig Femurkomponenten aus Metall verwendet. Im Vergleich versprechen keramische Femurkomponenten verbesserte tribologische und allergologische Eigenschaften. Bei der Verwendung keramischer Implantate besteht jedoch das Risiko einer Schädigung als Folge von Spannungsspitzen. Dies muss durch suffizientes Design, korrekte Werkstoffzusammensetzung und optimale Kraftübertragung zwischen Implantat und Knochenlager mittels Knochenzement minimiert werden. In dieser Arbeit wurde der Einfluss der Zementschichtdicke auf die Span...
Source: Biomedizinische Technik/Biomedical Engineering - August 10, 2007 Category: Biomedical Engineering Authors: Christine SchultzeDaniel KlüßHeiner MartinVolker HingstWolfram MittelmeierKlaus-Peter SchmitzRainer Bader Source Type: journals

Ellbogendysplasie beim Hund: Finite-Elemente-Analyse / Elbow dysplasia in the dog: finite element analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(4): 308-314 Ellbogengelenkserkrankungen gewinnen bei jungen Hunden großer, schnellwüchsiger und bewegungsfreudiger Rassen seit Jahren zunehmend an Bedeutung. Als mögliche Ursachen der Ellbogendysplasie wurden – neben genetischer Veranlagung – Übergewicht und Überlastung der gelenkbildenden Knochen benannt. In der vorliegenden Untersuchung wurde der Einfluss verschiedener biomechanischer Parameter auf die Lastübertragung in gesunden und pathologischen Hundeellbogen mit einem zweidimensionalen Finite-Elemente-Modell analysiert. Pathologische Veränderungen der Ellbo...
Source: Biomedizinische Technik/Biomedical Engineering - August 10, 2007 Category: Biomedical Engineering Authors: Anne PolikeitStephen J. FergusonPeter Schawalder Source Type: journals

Objective assessment of the fusion frequency in functional electrical stimulation using the fast Fourier transform / Objektive Bestimmung der Fusionsfrequenz in der funktionellen Elektrostimulation mittels Fast Fourier TransformationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Biomedizinische Technik/Biomedical Engineering 52(4): 267-273 In functional electrical stimulation (FES) the dynamics of tetanic muscle contractions is often described by the fusion frequency (FF), as determined by palpation: contractions elicited by stimulation frequencies above the FF appear smooth. To contribute to a more objective assessment of this important FES parameter, we have developed a dedicated signal analysis method based on fast Fourier transformation (FFT). The ripple to peak ratio (RrpFFT) – the relation between ripple amplitude and peak force value of a recorded tetanic muscle force in relation to the a...
Source: Biomedizinische Technik/Biomedical Engineering - August 1, 2007 Category: Biomedical Engineering Authors: Stefan SauermannDietmar RafoltManfred BijakEwald UngerHermann LanmuellerGerlinde WeigelWerner GirschWinfried Mayr Source Type: journals