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Seidel R, Katzer K, Bieck J, Langer M, Hesselbach J, Heilig M. Influence of Carbon-Based Fillers on the Electromagnetic Shielding Properties of a Silicone-Potting Compound. MATERIALS (BASEL, SWITZERLAND) 2024; 17:280. [PMID: 38255449 PMCID: PMC10820443 DOI: 10.3390/ma17020280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 12/08/2023] [Accepted: 12/28/2023] [Indexed: 01/24/2024]
Abstract
The effect of carbon-based additives on adhesives and potting compounds with regard to electrical conductivity and electromagnetic interference (EMI) shielding properties is of great interest. The increasing power of wireless systems and the ever-higher frequency bands place new demands on shielding technology. This publication gives an overview of the effect of carbon-based fillers on electrical conductivity, electromagnetic shielding properties, and the influence of different fillers and filler amounts on rheological behavior. This work focuses on carbon black (CB), recycled carbon fibers (rCF), carbon nanotubes (CNTs), and complex nanomaterials. Therefore, silicon samples with different fillers and filler amounts were prepared using a dual asymmetric centrifuge and a three-roll mill. It has been found that even with small filler amounts, the electromagnetic shielding properties were drastically raised. The filler content as well as the dispersion technique have a significant influence on most of the fillers. It has also been found that the complex viscosity is strongly influenced by the dispersion technique as well as by the choice and amount of filler. In the experiments carried out, shielding values of over 20 dB were achieved with several fillers, whereby even 43 dB were reached with complex, pre-crosslinked fillers. This signal reduction of up to 99.99% enables almost complete shielding of the related frequency.
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Affiliation(s)
- Rafael Seidel
- Fraunhofer Institute of Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Konrad Katzer
- Fraunhofer Institute of Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Jakob Bieck
- Fraunhofer Institute of Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Maurice Langer
- Fraunhofer Institute of Material and Beam Technology IWS, 01277 Dresden, Germany
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Nowak B, Przibille O, Napp A. [Electromagnetic interference : Pacemakers, cardiac resynchronization therapy devices, implantable cardioverter-defibrillator]. Herzschrittmacherther Elektrophysiol 2022; 33:297-304. [PMID: 35781834 DOI: 10.1007/s00399-022-00875-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
Patients with cardiac pacemakers, implantable cardioverter-defibrillators (ICDs), and cardiac resynchronization therapy devices (CRT) are exposed to different types of electromagnetic interference (EMI) at home and at work. Due to the constantly increasing role of electrically active appliances in daily use and the introduction of new therapy concepts such as the leadless cardiac pacemaker and the subcutaneous defibrillator, this topic is of great relevance. The further development of the implanted devices and the almost complete use of bipolar leads has reduced the overall risk of EMI. This review article provides information about the current status of possible interference in the private environment and how to avoid it. In addition, information is provided on how to deal with occupational sources of interference.
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Affiliation(s)
- Bernd Nowak
- Cardioangiologisches Centrum Bethanien, Im Prüfling 23, 60389, Frankfurt a.M., Deutschland.
| | - Oliver Przibille
- Cardioangiologisches Centrum Bethanien, Im Prüfling 23, 60389, Frankfurt a.M., Deutschland
| | - Andreas Napp
- Medizinische Klinik I, - Kardiologie, Angiologie und Internistische Intensivmedizin, Uniklinik RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Deutschland
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Guettler NJ, Cox A, Holdsworth DA, Rajappan K, Nicol ED. Possible safety hazards with cardiac implantable electronic devices in those working in the aviation industry. Eur J Prev Cardiol 2022; 30:zwac045. [PMID: 35234879 DOI: 10.1093/eurjpc/zwac045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 02/23/2022] [Accepted: 03/01/2022] [Indexed: 11/12/2022]
Affiliation(s)
- Norbert J Guettler
- Internal Medicine and Cardiology Section, Air Force Centre of Aerospace Medicine, Fuerstenfeldbruck, Germany
- Departments of Cardiology and Electrophysiology, Bundeswehr Central Hospital, Koblenz, Germany
| | - Andrew Cox
- Departments of Cardiology and Electrophysiology, Joint Hospital Group (South East), Frimley Park Hospital, Camberley, UK
| | - David A Holdsworth
- Aviation Medicine Clinical Service, Centre of Aviation Medicine, RAF Henlow, Bedfordshire, UK
- Department of Cardiology, Oxford Unviversity Hospital, Headley Way, Oxford, UK
| | - Kim Rajappan
- Department of Cardiology, Oxford Unviversity Hospital, Headley Way, Oxford, UK
- Department of Electrophysiology, Oxford Unviversity Hospital, Headley Way, Oxford, UK
| | - Edward D Nicol
- Aviation Medicine Clinical Service, Centre of Aviation Medicine, RAF Henlow, Bedfordshire, UK
- Department of Cardiology, Royal Brompton Hospital, London, UK
- School of Biomedical Engineering and Information Sciences, Kings College, London, UK
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Roehrich L, Suendermann S, Just IA, Knierim J, Mulzer J, Mueller M, Eulert-Grehn JJ, Hummel M, Starck C, Potapov E, Knosalla C, Falk V, Schoenrath F. Safety of bioelectrical impedance analysis in advanced heart failure patients. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2020; 43:1078-1085. [PMID: 32696523 DOI: 10.1111/pace.14018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 06/25/2020] [Accepted: 07/19/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND Cardiac cachexia and frailty are major complications of advanced heart failure (AHF). Bioelectrical impedance analysis (BIA) may provide valuable information regarding fluid balance, muscle mass and prognosis. The main concerns regarding the use of BIA in AHF patients remain arrhythmias and electromagnetic interferences with cardiac implantable electronic devices (CIEDs). Reliable data regarding patients on continuous-flow ventricular assist device (cf-VAD) remain scarce. The aim of this study is to evaluate the safety of BIA in AHF patients on pro-arrhythmogenic therapy with an implanted CIED and/or with a cf-VAD. METHODS We prospectively performed 217 BIA measurements in 143 AHF patients at risk of severe arrhythmias due to inotropic support/a history of ventricular arrhythmias and/or treated with CIED, including 104 patients with an ICD, CRT or pacemaker and 95 patients with a cf-VAD. All patients were under continuous Electrocardiogram (ECG) monitoring and clinical surveillance for 24 hours. RESULTS No adverse events were observed during the 217 BIA measurements: No rhythm disturbances were documented in the telemetric monitoring during or within 30 minutes after the measurement. CIEDs showed no malfunction, regardless of the location measured or the device manufacturer. In particular, no inappropriate shocks were observed. No alarms, flow disturbances, or malfunctions of the cf-VAD occurred during or after the measurements. CONCLUSION We consider BIA a safe measurement with major clinical relevance in our cohort of AHF patients, despite an increased arrhythmic potential on inotropic support or the presence of implanted electronic devices (ICD, CRT, pacemaker and cf-VAD).
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Affiliation(s)
- Luise Roehrich
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany.,German Heart Foundation, Frankfurt am Main, Germany
| | - Simon Suendermann
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany.,Department of Cardiothoracic Surgery, Charité - Universitätsmedizin Berlin Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Berlin, Germany
| | - Isabell Anna Just
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany
| | - Jan Knierim
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany
| | - Johanna Mulzer
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany
| | - Marcus Mueller
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany
| | - Jaime-Juergen Eulert-Grehn
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany
| | | | - Christoph Starck
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany
| | - Evgenij Potapov
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany
| | - Christoph Knosalla
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany
| | - Volkmar Falk
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany.,Department of Cardiothoracic Surgery, Charité - Universitätsmedizin Berlin Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Berlin, Germany.,Department of Health Sciences and Technology, ETH Zürich, Zürich, Switzerland
| | - Felix Schoenrath
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Berlin, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany
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