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Yang L, Feng B, Zhang Y, Li X, Zhang L, Chen X, Nie J, Wen H, Tian J, Jian J, Huang J, Zhu D, Zhang A, Tong X, Wen L. Single Wire Capacitive Wireless Power Transfer System for Wearable Biomedical Sensors Based on Flexible Graphene Film Material. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 2022; 16:1337-1347. [PMID: 36094965 DOI: 10.1109/tbcas.2022.3205762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This paper provides a special flexible graphene film based capacitive wireless power transfer (FGCPT) system for powering biomedical sensors of smart wearable devices. The graphene conductive material is flexible, transparent, highly conductive, and impermeable to most gases and liquids. Generally, the coupling structure of capacitive wireless power transfer (CPT) system is consisted of metal plates. However, it is hard to use for the biomedical sensors as the low power density and big volume. The shape of graphene conductive material could be easily built and changed according to the application requirements. In this paper, the power supply of biomedical sensing system could be accomplished by a single graphene film which is acted as the receiver of FGCPT system. The 200 mW power level is achieved with the maximum 9 V output voltage. The theory and calculation are verified by the simulated and experimental results.
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Perley A, Roustaei M, Aguilar-Rivera M, Kunkel DC, Hsiai TK, Coleman TP, Abiri P. Miniaturized wireless gastric pacing via inductive power transfer with non-invasive monitoring using cutaneous Electrogastrography. Bioelectron Med 2021; 7:12. [PMID: 34425917 PMCID: PMC8383397 DOI: 10.1186/s42234-021-00074-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 07/12/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Gastroparesis is a debilitating disease that is often refractory to pharmacotherapy. While gastric electrical stimulation has been studied as a potential treatment, current devices are limited by surgical complications and an incomplete understanding of the mechanism by which electrical stimulation affects physiology. METHODS A leadless inductively-powered pacemaker was implanted on the gastric serosa in an anesthetized pig. Wireless pacing was performed at transmitter-to-receiver distances up to 20 mm, frequency of 0.05 Hz, and pulse width of 400 ms. Electrogastrogram (EGG) recordings using cutaneous and serosal electrode arrays were analyzed to compute spectral and spatial statistical parameters associated with the slow wave. RESULTS Our data demonstrated evident change in EGG signal patterns upon initiation of pacing. A buffer period was noted before a pattern of entrainment appeared with consistent and low variability in slow wave direction. A spectral power increase in the EGG frequency band during entrainment also suggested that pacing increased strength of the slow wave. CONCLUSION Our preliminary in vivo study using wireless pacing and concurrent EGG recording established the foundations for a minimally invasive approach to understand and optimize the effect of pacing on gastric motor activity as a means to treat conditions of gastric dysmotility.
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Affiliation(s)
- Andrew Perley
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Mehrdad Roustaei
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Marcelo Aguilar-Rivera
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - David C Kunkel
- Division of Gastroenterology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Tzung K Hsiai
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.,Department of Medicine, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Todd P Coleman
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Parinaz Abiri
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA. .,Department of Medicine, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
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Abiri P, Duarte-Vogel S, Chou TC, Abiri A, Gudapati V, Yousefi A, Roustaei M, Chang CC, Cui Q, Hsu JJ, Bersohn M, Markovic D, Chen J, Tai YC, Hsiai TK. In Vivo Intravascular Pacing Using a Wireless Microscale Stimulator. Ann Biomed Eng 2021; 49:2094-2102. [PMID: 33537925 DOI: 10.1007/s10439-021-02729-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 01/07/2021] [Indexed: 11/26/2022]
Abstract
Millions of patients worldwide are implanted with permanent pacemakers for the treatment of cardiac arrhythmias and conduction disorders. The increased use of these devices has established a growing clinical need to mitigate associated complications. Pacemaker leads, in particular, present the primary risks in most implants. While wireless power transfer holds great promise in eliminating implantable device leads, anatomical constraints limit efficient wireless transmission over the necessary operational range. We thereby developed a transmitter-centered control system for wireless power transfer with sufficient power for continuous cardiac pacing. Device safety was validated using a computational model of the system within an MRI-based anatomical model. The pacer was then fabricated to meet the acute constraints of the anterior cardiac vein (ACV) to enable intravascular deployment while maintaining power efficiency. Our computational model revealed the wireless system to operate at > 50 times below the tissue energy absorption safety criteria. We further demonstrated the capacity for ex vivo pacing of pig hearts at 60 beats per minute (BPM) and in vivo pacing at 120 BPM following pacer deployment in the ACV. This work thus established the capacity for wireless intravascular pacing with the potential to eliminate complications associated with current lead-based deep tissue implants.
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Affiliation(s)
- Parinaz Abiri
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Cardiology, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Sandra Duarte-Vogel
- Division of Laboratory Animal Medicine, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Tzu-Chieh Chou
- Department of Medical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Arash Abiri
- School of Medicine, University of California, Irvine, Irvine, CA, 92697, USA
| | - Varun Gudapati
- Department of Cardiology, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Alireza Yousefi
- Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Mehrdad Roustaei
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Chih-Chiang Chang
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Qingyu Cui
- Department of Cardiology, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Jeffrey J Hsu
- Department of Cardiology, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Malcolm Bersohn
- Department of Cardiology, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Dejan Markovic
- Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Jun Chen
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Yu-Chong Tai
- Department of Medical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Tzung K Hsiai
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
- Department of Cardiology, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
- Department of Medical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.
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