Markus Detert
Otto-von-Guericke University Magdeburg
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Publication
Featured researches published by Markus Detert.
Biomedizinische Technik | 2015
Mandy Kaiser; Markus Detert; Martin A. Rube; Abubakr El-Tahir; Ole Jakob Elle; Andreas Melzer; Bertram Schmidt; Georg Rose
Abstract Magnetic resonance imaging (MRI) has great potential as an imaging modality for guiding minimally invasive interventions because of its superior soft tissue contrast and the possibility of arbitrary slice positioning while avoiding ionizing radiation and nephrotoxic iodine contrast agents. The major constraints are: limited patient access, the insufficient assortment of compatible instruments and the difficult device visualization compared to X-ray based techniques. For the latter, resonant MRI markers, fabricated by using the wire-winding technique, have been developed. This fabrication technique serves as a functional model but has no clinical use. Thus, the aim of this study is to illustrate a four-phase design process of resonant markers involving microsystems technologies. The planning phase comprises the definition of requirements and the simulation of electromagnetic performance of the MRI markers. The following technologies were considered for the realization phase: aerosol-deposition process, hot embossing technology and thin film technology. The subsequent evaluation phase involves several test methods regarding electrical and mechanical characterization as well as MRI visibility aspects. The degree of fulfillment of the predefined requirements is determined within the analysis phase. Furthermore, an exemplary evaluation of four realized MRI markers was conducted, focusing on the performance within the MRI environment.
Biomedizinische Technik | 2012
Markus Detert; Stefan Friesecke; Martin Deckert; Georg Rose; Bertram Schmidt; Mandy Kaiser
The technology of hot embossing is an established process for many years in the realization of electrical and optical conductors. The ability of this method is the realization of robust and reliable structures. In connection with the studies presented here, these skills are applied to the three-dimensional shape of a catheter or other instruments in the field of medical imaging. We generate as an example resonant circuits with the hot embossing technology. The use of hot-embossing technology improves the mechanical stability of the electrical conductor of the resonant circuits through the improved anchoring of the realized structures. The structural resolution is less than 100 microns and the structure height up to 1000 microns with very good reproducibility. The idea for the use of hot embossing is here pursued in two directions. Firstly, for the creation of channels that will later be functionalized by the addition of metal fillers to electrical conductors. For this solution we fill the embossed structures with polymer thick film paste materials. On the other hand, the known from the 3D-MID technology equipment will be used to emboss foil to create three-dimensional structures. As third way we use a classical FPC and laminate this to the surface of the three-dimensional shape with the help of hot embossing technology. All different solution ways will be characterized electrically with the needed values and their visibility in MR image process. The focus of the work, however, lies in the improvement of the mechanical properties of the resonant circuit. Due to the possibilities of the hot embossing technology we can transfer the ideas to other instruments and tools in the medical image processing. A final testing with accelerated temperature storage will be give a detailed answer to the mechanical behavior, because all tools are used under difficult conditions.
Biomedizinische Technik | 2012
Mandy Kaiser; Axel Boese; Andreas Brose; Martin Deckert; Georg Rose; Bertram Schmidt; Uta Wonneberger; Frank Fischbach; Jens Ricke; Markus Detert
Open MR scanners with an improved patient access are well-suited for minimal-invasive interventions. Considering that instruments like catheters appear hypointense in the MR image due to their signal-loss artefact, suitable visualization techniques like passive resonant circuits tuned to the Larmor frequency are required for generating a hyperintense change of the signal intensity. Within this paper various microsystems technologies for fabricating resonant markers will be compared in order to estimate their potential for a subsequent application.
international spring seminar on electronics technology | 2016
Kai Pitschmann; David Wagner; Sven Brinkhues; Bertram Schmidt; Markus Detert
The focus of this work was the development of additive metal deposition techniques on Polydimethylsiloxane based foils. The metallic films provide electrical interconnection to commercial available surface-mount devices. Therefor two maskless techniques were investigated. First was Aerosol Jet® deposition using an Optomec 3D printer and second was a laser structured thin film, which was deposited with physical vapor deposition (PVD). In addition the contacting between the SMDs and the interposer with an adhesive and a reactive multi-layer foil were investigated. Finally demonstrators which showed the principal functionality were built. For this purpose a simple circuit, composed of battery powered LEDs and a PIC® microcontroller, was developed. The circuit also includes a simple sensor logic which activates the LEDs by touching a comb structure.
Thoracic and Cardiovascular Surgeon | 2018
Sebastian Vogt; Markus Detert; David Wagner; Jan Wessel; Rabia Ramzan; Wilhelm Nimphius; Anette Ramaswamy; Subhajit Guha; Christian Wenger; Farabi Ibne Jamal; Mohammed Hussein Eissa; Ulrich Schumann; Betram Schmidt; Georg Rose; Christoph Dahl; Ilona Rolfes; Gordon Notzon; Christoph Baer; Thomas Musch
Background Microcalcifications within the fibrous cap of the arteriosclerotic plaques lead to the accrual of plaque‐destabilizing mechanical stress. New techniques for plaque screening with small detectors and the ability to differentiate between the smooth and hard elements of plaque formation are necessary. Method Vascular plaque formations are characterized as calcium phosphate containing structures organized as hydroxylapatite resembling the mineral whitlockite. In transmission and reflexion studies with a simple millimeter wave (mm‐wave)‐demonstrator, we found that there is a narrow window for plaque detection in arterial vessels because of the tissue water content, the differentiation to fatty tissue, and the dielectric property of air or water, respectively. Result The new sensor is based on a sensing oscillator working around 27 GHz. The open‐stub capacitance determines the operating frequency of the sensor oscillator. The capacitance depends on the dielectric properties of the surrounding material. The sensor components were completely built up in surface mount technique. Conclusion Completed with a catheter, the sensor based on microwave technology appears as a robust tool ready for further clinical use.
international spring seminar on electronics technology | 2017
David Wagner; Kai Pitschmann; Bertram Schmidt; Ulrich Schumann; Sebastian Freidank; Markus Detert
The paper deals with the technique of a hot bar technology for joining conductor lines of flexible interposers directly with copper wires inside of a catheter wall. The copper wires were integrated during the extrusion process inside of the catheter wall. The main part of this paper is concentrating on the evaluation process of such a joining technique. There were used different solder materials. With the help of a design of experiments the process was planned. The final goal is a repeatable process for such a joining method and the integration of a flexible interposer directly inside of a connectable catheter wall.
ieee international workshop on advances in sensors and interfaces | 2017
Sebastian Preidank; Markus Detert; Sören Hirsch
This paper introduces a new approach to detect multiple inputs for touchless human machine interfaces. It is based on optical proximity sensing with visible or infrared light. It is described the principle of modulation, demodulation and system design. In the last part, some applications are presented to use this approach. The approach is based on multiple modulated light sources. The modulation is a form of direct sequence spread spectrum technique. One main advantage of the design is, that only one receiver is needed to detect multiple inputs. This held the system cost low.
Current Directions in Biomedical Engineering | 2016
David Wagner; Sebastian Vogt; Farabi Ibne Jamal; Subhajit Guha; Christian Wenger; Jan Wessel; Dietmar Kissinger; Kai Pitschmann; Ulrich Schumann; Bertram Schmidt; Markus Detert
Abstract Arteriosclerosis and associated cardiovascular disease remains the leading cause of mortality. Improved methods for vascular plaque detection allow early diagnose and better therapeutic options. Present diagnostic tools require intense technical expenditure and diminish value of modern screening methods. Our group developed an microwave sensor for on-site detection of plaque formation in arterial vessels. The sensor is an oscillator working around 27 GHz which is coupled to a microstrip stub line. The final flexible polyimid interposer has a length of 38 cm, a width of 1.2 mm and a thickness of 200 μm. Because of its minimal size the interposer completed a catheter with a diameter of 8F ready for further clinical use in cardiology and heart surgery.
2016 6th Electronic System-Integration Technology Conference (ESTC) | 2016
David Wagner; Farabi Ibne Jamal; Subhajit Guha; Christian Wenger; Jan Wessel; Dietmar Kissinger; Daniel Ernst; Ulrich Schumann; Kai Pitschman; Bertram Schmidt; Markus Detert
The paper deals with a new technique for deviation of atherosclerotic plaque. There are two plaque types: The yellow and white plaque. The white plaque is hard, fibrous and dimensionally stable. The yellow plaque is soft with high-cholesterol ratio and dimensionally instable. Every hit with a medical tool can generate a critical medical case, because the plaque can be rapture and the plaque particles could cause in a stroke. A catheter with a BiCMOS microwave sensor was developed in the latest research. For a stable function and a high reliability a suitable electronic packaging has to be fulfill. The development starting with the sensor design up to a complete electronic packaging which allows a measurement in different liquids and tissues is discussed in this paper.
Current Directions in Biomedical Engineering | 2015
David Wagner; Markus Porsch; Markus Detert; F. Bartel; Sandra Siedentopf; Daniel Schindele; Jj. Wendler; Anke Lux; Bertram Schmidt; Martin Schostak; Ub. Liehr
Abstract Adequate diagnosis of upper urinary tract (UUT) tumors is essential for successful local treatment. Organsparing approaches are technically difficult and require consistent further development. Appropriate models for investigating new diagnostic and therapeutic methods are not yet available. This study demonstrates the incorporation of a fresh sample model into five different test levels (I-V) for improving the diagnosis and therapy of ureteral tumors. In these test levels, new diagnostic and ablation techniques are evaluated for feasibility, application safety, efficacy and accuracy. An assessment of their suitability for broad preclinical and clinical application also took economic aspects into account.