TY - CHAP A1 - Carl, Ann-Kathrin A1 - Hochmann, David T1 - Regulatory Framework for 3D Printed Custom-Made Devices in Europe T2 - Beitrag zur 3. Additive Manufacturing Meets Medicine (AMMM) Konferenz N2 - Additive manufacturing (AM) has been growing continuously over the past 20 years, enabling unprecedented tailoring to the anatomy of each patient. In Europe, custom-made devices qualify for an exemption and pass a simplified approval process. New technologies, like AM, provoke questions about the adequacy of the current regulatory framework for custom-made devices. This article addresses the regulatory requirements for such devices in Europe and discusses the implications for AM. It concludes that the legal framework for custom-made devices entails uncertainties which need to be resolved to guide manufacturers through the regulatory requirements, highlighting the specific areas of focus for AM. Y1 - 2021 U6 - http://dx.doi.org/10.18416/AMMM.2021.2109542 SN - 2699-1977 ER - TY - JOUR A1 - Carl, Ann-Kathrin T1 - Ergebnisse einer Umfrage der FH Münster. MDR und die Hilfsmittelbranche JF - MTD Medizintechnischer Dialog Y1 - 2021 SN - 0935-137X VL - 47 IS - 10 SP - 16 EP - 18 ER - TY - JOUR A1 - Carl, Ann-Kathrin A1 - Hochmann, David T1 - MDR – Wie gut vorbereitet ist die Hilfsmittelbranche? JF - mt-medizintechnik N2 - Im Mittelpunkt der Medizintechnikbranche stand in den letzten Jahren fast ausschließlich ein Thema: die Medical Device Regulation, kurz MDR. Mit Inkrafttreten der MDR steigen die regulatorischen Anforderungen für alle Akteure der Medizintechnikbranche in ganz Europa. Vor allem kleine und mittelständische Unternehmen werden durch die Implementierung der MDR vor Herausforderungen gestellt. Das Ziel der durchgeführten Online-Befragung war es, ein umfassendes Erfahrungs- und Meinungsbild hinsichtlich der Akzeptanz und Umsetzbarkeit der MDR zu gewinnen. Hierfür wurden Händler und Hersteller orthopädischer Hilfsmittel im Januar und Februar 2021 deutschlandweit anonymisiert befragt. In diesem Artikel werden die Ergebnisse der Umfrage ausführlich dargestellt und diskutiert. KW - Medical Device Regulation KW - MDR KW - Medizinprodukte KW - Hilfsmittelbranche KW - Regulatorik Y1 - 2021 SN - 0344-9416 VL - 141 IS - 2 SP - 34 EP - 39 ER - TY - JOUR A1 - Hinricher, N. A1 - Pawelzik, L. A1 - Backhaus, C. T1 - Investigation of Impulse Oscillometry for the Detection of Extravasations using Design of Experiments and an Infusion Simulator JF - Medical Engineering and Physics Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.medengphy.2021.04.002 SN - 1350-4533 VL - 92 IS - 19 SP - 33 EP - 39 ER - TY - CHAP A1 - Hinricher, N. A1 - König, S. A1 - Backhaus, C. T1 - Usability-Evaluation von Steuerständen mittels Wizard-of-Oz Methode und Klickdummies am Beispiel eines Prototyps zur Steuerung einer Onshore-Bohranlage T2 - Beitrag zum 67. Kongress der Gesellschaft für Arbeitswissenschaft Y1 - 2021 SN - 978-3-936804-29-4 SP - C.3.2 PB - Dortmund CY - GfA-Press ER - TY - CHAP A1 - König, S. A1 - Hinricher, N. A1 - Backhaus, C. T1 - Physisches Modell oder virtueller Prototyp? Ein vergleichender Usability-Test am Beispiel eines Blutdruckmessgerätes T2 - Beitrag zum 67. Kongress der Gesellschaft für Arbeitswissenschaft Y1 - 2021 SN - 978-3-936804-29-4 SP - A.7.3 PB - GfA-Press CY - Dortmund ER - TY - CHAP A1 - Ibenthal, E. A1 - Kehmann, M. A1 - Backhaus, C. T1 - Arbeitswissenschaftliche Analyse zum Verhalten von Menschen mit Demenz in stationären Pflegeeinrichtungen unter Einfluss personalisierter Musik T2 - Beitrag zum 67. Kongress der Gesellschaft für Arbeitswissenschaft Y1 - 2021 SN - 978-3-936804-29-4 SP - C.3.1 PB - GfA-Press CY - Dortmund ER - TY - JOUR A1 - Pawelzik, L. A1 - Backhaus, C. T1 - Evaluation of Impuls-Oscillometric Extravasatio Prevention JF - Medical Engineering and Physics Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.medengphy.2020.12.004 SN - 1350-4533 VL - 88 SP - 54 EP - 58 ER - TY - CHAP A1 - Nguyen, K. A1 - Martina, S. A1 - Kernagis, D. A1 - Bershad, E. A1 - Clark, J. A1 - Hinricher, N. A1 - Backhaus, C. T1 - Effekt of repetetive, successive oculometric testing an saccades, smooth pursuit, and visual reaction times for future head down bed rest study (HDBR) applikations T2 - Contribution to the NASA Online-Conference for Advancing Human Space Flight Research Through Innovation and Collaboration Y1 - 2021 ER - TY - JOUR A1 - Ibenthal, E. A1 - Kehmann, M. A1 - Backhaus, C. T1 - Effectiveness of personalized music systems to influence neuropsychiatric symptoms associated with dementia: a quasi-experimental study JF - EXPLORE: The Journal of Science & Healing Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.explore.2021.03.004 VL - 18 SP - 319 EP - 326 ER - TY - CHAP A1 - Backhaus, C. A1 - Haimerl, G. T1 - Engineers in Clinical Perfusion T2 - Contribution to the 59th International Conference of the American Society for Extracorpreal Technology. AmSECT International Online Conference Y1 - 2021 ER - TY - JOUR A1 - Backhaus, C. T1 - Das Ende der Übergangsfrist der MDR – Gewinn oder Risiko für die Patientensicherheit? JF - mt-Medizintechnik Y1 - 2021 SN - 0344-9416 VL - 141 IS - 4 SP - 2 EP - 3 ER - TY - JOUR A1 - Ibenthal, E. A1 - Backhaus, C. T1 - Arbeit in der stationären Demenzpflege – Unterschiede zwischen einer Pflegefachkraft, Pflegeassistenz und Betreuungskraft JF - Zentralbl. Arbeitsmed Y1 - 2021 U6 - http://dx.doi.org/10.1007/s40664-021-00442-w VL - 71 SP - 270 EP - 280 ER - TY - CHAP A1 - König, S. A1 - Klebsch, L. A1 - Ostermann, R. A1 - Hinricher, N. A1 - Kaluza, M. A1 - Walter, S. A1 - Heemels, H. A1 - Backhaus, C. T1 - Anwendbarkeit von Augmented Reality Systemen für eine unterstützte Fehlerbehebung an ECMO/ECLS-Systemen auf Intensivstationen T2 - Beitrag zur 50. Internationalen Jahrestagung der Deutschen Gesellschaft für Kardiotechnik Y1 - 2021 ER - TY - JOUR A1 - König, S. A1 - Hinricher, N. A1 - Backhaus, C. T1 - VR-bility in der Medizintechnik - Medizinprodukte mittels Virtual Reality gebrauchstauglich gestalten JF - Arbeitsmed. Sozialmed. Umweltmed Y1 - 2021 SN - 0944-6052 VL - 46 SP - 603 EP - 605 ER - TY - JOUR A1 - Wermers, Jens A1 - Schliemann, Benedikt A1 - Raschke, Michael J. A1 - Dyrna, Felix A1 - Heilmann, Lukas F. A1 - Michel, Philipp A. A1 - Katthagen, J. Christoph T1 - The Glenolabral Articular Disruption Lesion Is a Biomechanical Risk Factor for Recurrent Shoulder Instability JF - Arthroscopy, Sports Medicine, and Rehabilitation Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.asmr.2021.08.007 SN - 2666-061X VL - 3 IS - 6 SP - e1803 EP - e1810 ER - TY - JOUR A1 - Wermers, Jens A1 - Raschke, Michael J. A1 - Wilken, Marcel A1 - Riegel, Arne A1 - Katthagen, J. Christoph T1 - The Anatomy of Glenoid Concavity-Bony and Osteochondral Assessment of a Stability-Related Parameter JF - Journal of Clinical Medicine Y1 - 2021 U6 - http://dx.doi.org/10.3390/jcm10194316 SN - 2077-0383 VL - 10 IS - 19 SP - 4316 ER - TY - JOUR A1 - Katthagen, J. Christoph A1 - Michel, Philipp A1 - Raschke, Michael J. A1 - Sußiek, Julia A1 - Frank, Andre A1 - Wermers, Jens A1 - Dyrna, Felix A1 - Schliemann, Benedikt T1 - The forgotten fragment: additional lesser tuberosity fixation of 4-part proximal humeral fractures-a biomechanical investigation JF - Journal of Shoulder and Elbow Surgery Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jse.2021.04.041 SN - 1532-6500 VL - 30 IS - 12 SP - 2852 EP - 2861 ER - TY - JOUR A1 - Wermers, Jens A1 - Schliemann, Benedikt A1 - Raschke, Michael J. A1 - Michel, Philipp A. A1 - Heilmann, Lukas F. A1 - Dyrna, Felix A1 - Sußiek, Julia A1 - Frank, Andre A1 - Katthagen, J. Christoph T1 - Glenoid concavity has a higher impact on shoulder stability than the size of a bony defect JF - Knee Surgery, Sports Traumatology, Arthroscopy Y1 - 2021 U6 - http://dx.doi.org/10.1007/s00167-021-06562-3 ER - TY - JOUR A1 - Sandten, Christian Stefan A1 - Böing, Christian A1 - Hrincius, Eike A1 - Anhlan, Darisuren A1 - Kreyenschmidt, Martin A1 - Ludwig, Stephan A1 - Mertins, Hans-Christoph A1 - Mellmann, Alexander A1 - Dworog, Andreas A1 - Hanning, Stephanie A1 - Kuennemann, Thilo A1 - Niehues, Christopher A1 - Schupp, Thomas A1 - Stec, Edyta A1 - Thume, Julius A1 - Triphaus, Daniel A1 - Wilkern, Markus A1 - Uphoff, Holger A1 - Zündorf, Josef A1 - Jacobshagen, Anja T1 - Decontamination of disposable respirators for reuse in a pandemic employing in-situ-generated peracetic acid JF - American Journal of Infection Control KW - Sars-CoV-2 Y1 - 2021 UR - https://www.ajicjournal.org/action/showPdf?pii=S0196-6553%2821%2900620-9 U6 - http://dx.doi.org/10.1016/j.ajic.2021.09.017 VL - 00 / 2021 SP - 1 EP - 7 ER - TY - JOUR A1 - Morawetz, KLaus T1 - Consistent solution of Einstein–Cartan equations with torsion outside matter Y1 - 2021 U6 - http://dx.doi.org/10.1088/1361-6382/ac2417 ER - TY - JOUR A1 - Morawetz, Klaus T1 - Exploring Anomalies by Many-Body Correlations JF - PSS B N2 - The quantum anomaly is written alternatively into a form violating conservation laws or as non-gauge invariant currents seen explicitly on the example of chiral anomaly. By reinterpreting the many-body averaging, the connection to Pauli–Villars regularization is established which gives the anomalous term a new interpretation as arising from quantum fluctuations by many-body correlations at short distances. This is exemplified using an effective many-body quantum potential which realizes quantum Slater sums by classical calculations. It is shown that these quantum potentials avoid the quantum anomaly but approach the same anomalous result by many-body correlations. Consequently, quantum anomalies might be a shortcut way of single-particle field theory to account for many-body effects. This conjecture is also supported since the chiral anomaly can be derived by a completely conserving quantum kinetic theory. A measure for the quality of quantum potentials is suggested to describe these quantum fluctuations in the mean energy. The derived quantum potentials might be used to describe quantum simulations in classical terms. Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-142836 PB - Wiley ER - TY - CHAP A1 - Freudling, Maximilian A1 - Grzesik, Andreas A1 - Erhard, Markus A1 - Gerhards, Maximilian A1 - Leitz, Sinje A1 - Verpoort, Sven A1 - Wittrock, Ulrich A1 - Hallibert, Pascal T1 - Space-qualified piezo based deformable mirror for future instruments with active optics T2 - Proceedings of the International Conference on Space Optics (ICSO) N2 - This paper presents the results of the technology development project “Enabling Technologies for Piezo-Based Deformable Mirrors in Active Optics Correction Chains” conducted by OHB System AG together with its partner Münster University of Applied Sciences (MUAS). The project was funded by ESA within their General Support Technology Programme (GSTP). We address in this paper mainly the definition, flow-down and verification of the requirements for the Deformable Mirror (DM). The requirements were derived from a set of real space mission applications. The deformation of the mirror is performed by piezo-ceramic actuators in an unimorph configuration. The finally developed DM is able produce Zernike modes with a stroke of several tens of µm over a clear optical aperture of 50 mm in diameter. It underwent successfully a full environmental qualification campaign including thermal cycling, shock- and vibration testing, as well as exposure to proton and γ–ray radiation. Thermal and performance tests were performed in the temperature range from 100 K to 300 K. Furthermore, the DM sustained all vibration (random 17.8 g RMS and sinus) and shock (300 g) testing. Thereby all criticalities which were identified a previous study have been overcome successfully. A Technology Readiness Level (TRL) of 5 is reached, as the component has been validated in relevant environment. Based on the high level of maturity, this deformable mirror is now ready for the incorporation in future flight instruments. The achieved TRL of 5 is sufficient for the status of a PDR at payload level and gives thus a very good basis for all kinds of potential B2, C/D payload developments. KW - deformable mirror KW - active optics KW - space qualification KW - space telescopes KW - adaptive optics Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-137410 UR - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11852/1185231/Space-qualified-Piezo-Based-Deformable-Mirror-for-future-Instruments-with/10.1117/12.2599467.full VL - 11852 SP - 1185231-11 ER - TY - CHAP A1 - Leitz, Sinje A1 - Gerhards, Maximilian A1 - Verpoort, Sven A1 - Wittrock, Ulrich A1 - Freudling, Maximilian A1 - Grzesik, Andreas A1 - Erhard, Markus A1 - Hallibert, Pascal T1 - Vibration and shock testing of a 50 mm aperture unimorph deformable mirror T2 - Proceedings of the International Conference on Space Optics (ICSO) N2 - We present our latest results on a refined unimorph deformable mirror which was developed in the frame of the ESA GSTP activity ”Enabling Technologies for Piezo-Based Deformable Mirrors in Active Optics Correction Chains”. The identified baseline concept with the soft piezoceramic material PIC151 successfully sustained all vibration requirements (17.8 gRMS random and 20 g sine) and shock testing (300 g SRS). We cover the mirror design development which reduces the stress in the brittle piezo-ceramic by 90 % compared to the design from a former GSTP activity. We briefly address the optical characterization of the deformable mirror, namely the achieved Zernike amplitudes as well as the unpowered surface deformation (1.7 µm) and active flattening (12.3 nmRMS). The mirror produces low-order Zernike modes with a stroke of several tens of micrometer over a correction aperture of 50 mm, which makes the mirror a versatile tool for space telescopes. KW - active optics KW - adaptive optics KW - deformable mirror KW - vibration damping KW - space telescopes Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-137401 UR - https://icso2020.com/ VL - 11852 SP - 118524N ER - TY - CHAP A1 - Wang, Hao A1 - Gurevich, Evgeny L A1 - Ostendorf, Andreas T1 - Application of nanoindentation technique to test surface hardness and residual stress of NiTi alloy after femtosecond laser shock peening T2 - High-Power Laser Materials Processing: Applications, Diagnostics, and Systems X / SPIE.Digital.Library N2 - Laser shock peening is a new and important surface treatment technique that can enhance the mechanical properties of metal materials. Normally, the nanosecond laser with pulse-width between 5 ns and 20 ns is used to induce a high-pressure shock wave that can generate plastic deformation in the top layer of metals. The femtosecond laser shock peening in the air has been studied recently, which can induce higher pressure shock wave than that of traditional nanosecond laser shock peening in a very short time. The NiTi alloy is processed by femtosecond laser shock peening, then a nanoindentation device is used to measure its surface hardness and residual stress. The hardness results of NiTi alloy before and after treatment show that the femtosecond laser shock peening can increase the hardness of NiTi alloy, which also shows that the femtosecond laser can be used to perform laser shock peening on NiTi alloy without coating. Y1 - 2021 UR - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11679/116790J/Application-of-nanoindentation-technique-to-test-surface-hardness-and-residual/10.1117/12.2593092.full?tab=ArticleLinkReference U6 - http://dx.doi.org/10.1117/12.2593092 SP - 116790J-0 EP - 116790J-5 PB - International Society for Optics and Photonics CY - USA ER - TY - JOUR A1 - Pues, Patrick A1 - Laube, Michael A1 - Fischer, Stefan A1 - Schröder, Franziska A1 - Schwung, Sebastian A1 - Rytz, Daniel A1 - Fiehler, Torben A1 - Wittrock, Ulrich A1 - Jüstel, Thomas T1 - Luminescence and up-conversion of single crystalline Lu3Al5O12:Pr3+ JF - Journal of Luminescence N2 - This work deals with the spectroscopic properties of praseodymium doped single crystalline lutetium aluminum garnet (LuAG:Pr3+). A special focus was set on temperature- and time-dependent spectroscopy. Beyond the well-known down-conversion luminescence of LuAG:Pr3+, also UV-A/B up-conversion luminescence under excitation with a 488 nm laser was thoroughly investigated. Furthermore, the results of the spectroscopic investigations on the single crystalline material were supplemented and compared with measurements on a microscale powder sample. In addition, to the spectroscopic investigations, mechanistic considerations are presented to obtain a closer look at the up-conversion process in LuAG:Pr3+. We promote the thesis of a temperature-dependent energy transfer up-conversion mechanism. KW - Pr3+ luminescence KW - Single crystal KW - Photoluminescence KW - Up-conversion KW - Temperature-dependent spectroscopy Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jlumin.2021.117987 VL - 234 SP - 117987 EP - 117995 ER - TY - JOUR A1 - Trinschek, Sarah A1 - Vorholt, Christian A1 - Wittrock, Ulrich T1 - Nonlinear dynamics in intra-cavity pumped thin-disk lasers JF - Optics Express N2 - Cross-saturation of the gain media in intra-cavity pumped lasers leads to complex dynamics of the laser power. We present experimental results and a detailed theoretical analysis of this nonlinear dynamics for an intra-cavity pumped Yb:YAG thin-disk laser in the framework of a rate-equation model. The gain medium of this laser is residing in the resonator of a conventional, diode-pumped Yb:YAG thin-disk laser. Continuous-wave operation, periodic pulse trains, and chaotic fluctuations of the optical power of both lasers were observed. The dynamics is not driven by external perturbations but arises naturally in this laser system. Further examination revealed that these modes of operation can be controlled by the resonator length of the diode-pumped laser but that the system can also show hysteresis and multi-stability. Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-132355 UR - https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-29-4-5755&id=447544 VL - 29 IS - 4 SP - 5755 EP - 5773 ER - TY - JOUR A1 - Dobbelstein, Henrik A1 - George, Easo P A1 - Gurevich, Evgeny L A1 - Kostka, Aleksander A1 - Ostendorf, Andreas A1 - Laplanche, Guillaume T1 - Laser metal deposition of refractory high-entropy alloys for high-throughput synthesis and structure-property characterization JF - International Journal of Extreme Manufacturing N2 - Progress in materials development is often paced by the time required to produce and evaluate a large number of alloys with different chemical compositions. This applies especially to refractory high-entropy alloys (RHEAs), which are difficult to synthesize and process by conventional methods. To evaluate a possible way to accelerate the process, high-throughput laser metal deposition was used in this work to prepare a quinary RHEA, TiZrNbHfTa, as well as its quaternary and ternary subsystems by in-situ alloying of elemental powders. Compositionally graded variants of the quinary RHEA were also analyzed. Our results show that the influence of various parameters such as powder shape and purity, alloy composition, and especially the solidification range, on the processability, microstructure, porosity, and mechanical properties can be investigated rapidly. The strength of these alloys was mainly affected by the oxygen and nitrogen contents of the starting powders, while substitutional solid solution strengthening played a minor role. Y1 - 2021 UR - https://iopscience.iop.org/article/10.1088/2631-7990/abcca8/meta VL - 3 IS - 1 SP - 015201 EP - 015201 PB - IOP Publishing ER - TY - JOUR A1 - Kasischke, Maren A1 - Hartmann, Simon A1 - Niermann, Kevin A1 - Kostyrin, Denis A1 - Thiele, Uwe A1 - Gurevich, Evgeny L T1 - Pattern Formation in Slot-Die Coating JF - arXiv.org N2 - We experimentally study the occurrence of pattern formation during the slot-die coating of low-viscosity nearly Newtonian liquids onto Polyethylenterephthalat (PET)-substrates. In particular, it is demonstrated that with increase of the coating speed a homogeneous coating becomes unstable with respect to periodic stripe patterns. Thereby, depending on the liquid viscosity, the stripes can be oriented parallel or perpendicular with respect to the coating direction. Mixed states do also occur. The spatial period of perpendicular [parallel] stripes increases [decrease] with the coating speed. The dependence of the effect on various control parameters of slot-die coating is investigated. Finally, a simple theoretical model based on the hydrodynamics of thin films of partially wetting liquids is analysed. Comparing the results to the experiments, conclusions are drawn regarding the acting instability and pattern formation mechanisms. Y1 - 2021 UR - https://arxiv.org/abs/2101.01614 VL - 2021 SP - 1 EP - 24 ER - TY - JOUR A1 - Wang, Hao A1 - Nett, Ralf A1 - Gurevich, Evgeny L A1 - Ostendorf, Andreas T1 - The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser JF - Applied Sciences N2 - The laser nitriding was performed in nitrogen gas at room temperature (20 °C) and low temperature (−190 °C) by a low power fiber laser to modify the wear and abrasion resistance of NiTi alloy. The surface roughness and element composition were analyzed by roughness device and energy-dispersive X-ray spectroscopy respectively. The results of roughness show that laser treatment can change the surface roughness due to the laser remelting. The effect of laser nitriding on the microhardness, friction coefficient, and worn scars of NiTi alloy was also studied, which shows that the microhardness of the NiTi alloy increases after laser nitriding. The optical microscope and scanning electron microscope were used to characterize the surface of NiTi alloy after wear testing to observe the microstructure of worn scars. The results show that the laser nitriding with different parameters can induce a nitride layer with different thicknesses and the higher energy deposition is the key factor for the formation of the nitride layer, which can decrease the friction coefficient and reduce wear loss during the application of NiTi alloy. The improvement of wear resistance can be attributed to the hard nitriding layer. KW - laser nitriding; wear resistance; NiTi alloy; roughness; microhardness Y1 - 2021 U6 - http://dx.doi.org/10.3390/app11020515 VL - 11 IS - 2 SP - 515 ER -