101
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Riley WT, Serrano KJ, Nilsen W, Atienza AA. Mobile and Wireless Technologies in Health Behavior and the Potential for Intensively Adaptive Interventions. Curr Opin Psychol 2015; 5:67-71. [PMID: 26086033 PMCID: PMC4465113 DOI: 10.1016/j.copsyc.2015.03.024] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Recent advances in mobile and wireless technologies have made real-time assessments of health behaviors and their influences possible with minimal respondent burden. These tech-enabled real-time assessments provide the basis for intensively adaptive interventions (IAIs). Evidence of such studies that adjust interventions based on real-time inputs is beginning to emerge. Although IAIs are promising, the development of intensively adaptive algorithms generate new research questions, and the intensive longitudinal data produced by IAIs require new methodologies and analytic approaches. Research considerations and future directions for IAIs in health behavior research are provided.
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Affiliation(s)
- William T. Riley
- National Cancer Institute, Division of Cancer Control and Population Sciences, Behavioral Research Program, Science of Research and Technology Branch
| | - Katrina J. Serrano
- National Cancer Institute, Division of Cancer Control and Population Sciences, Behavioral Research Program, Science of Research and Technology Branch
| | - Wendy Nilsen
- National Institutes of Health, Office of the Director, Office of Behavioral and Social Sciences Research
| | - Audie A. Atienza
- National Cancer Institute, Division of Cancer Control and Population Sciences, Behavioral Research Program, Science of Research and Technology Branch
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102
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Kang DY, Kim YS, Ornelas G, Sinha M, Naidu K, Coleman TP. Scalable Microfabrication Procedures for Adhesive-Integrated Flexible and Stretchable Electronic Sensors. SENSORS 2015; 15:23459-76. [PMID: 26389915 PMCID: PMC4610501 DOI: 10.3390/s150923459] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 09/05/2015] [Accepted: 09/10/2015] [Indexed: 12/05/2022]
Abstract
New classes of ultrathin flexible and stretchable devices have changed the way modern electronics are designed to interact with their target systems. Though more and more novel technologies surface and steer the way we think about future electronics, there exists an unmet need in regards to optimizing the fabrication procedures for these devices so that large-scale industrial translation is realistic. This article presents an unconventional approach for facile microfabrication and processing of adhesive-peeled (AP) flexible sensors. By assembling AP sensors on a weakly-adhering substrate in an inverted fashion, we demonstrate a procedure with 50% reduced end-to-end processing time that achieves greater levels of fabrication yield. The methodology is used to demonstrate the fabrication of electrical and mechanical flexible and stretchable AP sensors that are peeled-off their carrier substrates by consumer adhesives. In using this approach, we outline the manner by which adhesion is maintained and buckling is reduced for gold film processing on polydimethylsiloxane substrates. In addition, we demonstrate the compatibility of our methodology with large-scale post-processing using a roll-to-roll approach.
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Affiliation(s)
- Dae Y Kang
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA.
| | - Yun-Soung Kim
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA.
| | - Gladys Ornelas
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA.
| | - Mridu Sinha
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA.
| | - Keerthiga Naidu
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA.
| | - Todd P Coleman
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA.
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103
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Lee W, Kwon O, Lee DS, Yeo WH. Fabrication and Characterization of a Conformal Skin-like Electronic System for Quantitative, Cutaneous Wound Management. J Vis Exp 2015. [PMID: 26381652 DOI: 10.3791/53037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Recent advances in the development of electronic technologies and biomedical devices offer opportunities for non-invasive, quantitative assessment of cutaneous wound healing on the skin. Existing methods, however, still rely on visual inspections through various microscopic tools and devices that normally include high-cost, sophisticated systems and require well trained personnel for operation and data analysis. Here, we describe methods and protocols to fabricate a conformal, skin-like electronics system that enables conformal lamination to the skin surface near the wound tissues, which provides recording of high fidelity electrical signals such as skin temperature and thermal conductivity. The methods of device fabrication provide details of step-by-step preparation of the microelectronic system that is completely enclosed with elastomeric silicone materials to offer electrical isolation. The experimental study presents multifunctional, biocompatible, waterproof, reusable, and flexible/stretchable characteristics of the device for clinical applications. Protocols of clinical testing provide an overview and sequential process of cleaning, testing setup, system operation, and data acquisition with the skin-like electronics, gently mounted on hypersensitive, cutaneous wound and contralateral tissues on patients.
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Affiliation(s)
- Woosik Lee
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University
| | - Ohjin Kwon
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University
| | - Dong Sup Lee
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University
| | - Woon-Hong Yeo
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University; Center for Rehabilitation Science and Engineering, Virginia Commonwealth University; Massey Cancer Center, Virginia Commonwealth University;
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104
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Breathable and Stretchable Temperature Sensors Inspired by Skin. Sci Rep 2015; 5:11505. [PMID: 26095941 PMCID: PMC4476093 DOI: 10.1038/srep11505] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 05/26/2015] [Indexed: 12/23/2022] Open
Abstract
Flexible electronics attached to skin for healthcare, such as epidermal electronics, has to struggle with biocompatibility and adapt to specified environment of skin with respect to breath and perspiration. Here, we report a strategy for biocompatible flexible temperature sensors, inspired by skin, possessing the excellent permeability of air and high quality of water-proof by using semipermeable film with porous structures as substrate. We attach such temperature sensors to underarm and forearm to measure the axillary temperature and body surface temperature respectively. The volunteer wears such sensors for 24 hours with two times of shower and the in vitro test shows no sign of maceration or stimulation to the skin. Especially, precise temperature changes on skin surface caused by flowing air and water dropping are also measured to validate the accuracy and dynamical response. The results show that the biocompatible temperature sensor is soft and breathable on the human skin and has the excellent accuracy compared to mercury thermometer. This demonstrates the possibility and feasibility of fully using the sensors in long term body temperature sensing for medical use as well as sensing function of artificial skin for robots or prosthesis.
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105
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Hwang SW, Lee CH, Cheng H, Jeong JW, Kang SK, Kim JH, Shin J, Yang J, Liu Z, Ameer GA, Huang Y, Rogers JA. Biodegradable elastomers and silicon nanomembranes/nanoribbons for stretchable, transient electronics, and biosensors. NANO LETTERS 2015; 15:2801-8. [PMID: 25706246 DOI: 10.1021/nl503997m] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Transient electronics represents an emerging class of technology that exploits materials and/or device constructs that are capable of physically disappearing or disintegrating in a controlled manner at programmed rates or times. Inorganic semiconductor nanomaterials such as silicon nanomembranes/nanoribbons provide attractive choices for active elements in transistors, diodes and other essential components of overall systems that dissolve completely by hydrolysis in biofluids or groundwater. We describe here materials, mechanics, and design layouts to achieve this type of technology in stretchable configurations with biodegradable elastomers for substrate/encapsulation layers. Experimental and theoretical results illuminate the mechanical properties under large strain deformation. Circuit characterization of complementary metal-oxide-semiconductor inverters and individual transistors under various levels of applied loads validates the design strategies. Examples of biosensors demonstrate possibilities for stretchable, transient devices in biomedical applications.
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Affiliation(s)
- Suk-Won Hwang
- †KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-701, Korea
| | - Chi Hwan Lee
- ‡Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Huanyu Cheng
- §Department of Mechanical Engineering, Civil and Environmental Engineering, Center for Engineering and Health, and Skin Disease Research Center, Northwestern University, Evanston, Illinois 60208, United States
| | - Jae-Woong Jeong
- ∥Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309, United States
| | - Seung-Kyun Kang
- ‡Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jae-Hwan Kim
- ‡Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jiho Shin
- ⊥Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jian Yang
- #Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Zhuangjian Liu
- ∇Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
| | - Guillermo A Ameer
- #Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Yonggang Huang
- §Department of Mechanical Engineering, Civil and Environmental Engineering, Center for Engineering and Health, and Skin Disease Research Center, Northwestern University, Evanston, Illinois 60208, United States
| | - John A Rogers
- ‡Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- ○Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- ◆Department of Chemistry, Mechanical Science and Engineering, Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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106
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Soft, curved electrode systems capable of integration on the auricle as a persistent brain-computer interface. Proc Natl Acad Sci U S A 2015; 112:3920-5. [PMID: 25775550 DOI: 10.1073/pnas.1424875112] [Citation(s) in RCA: 179] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Recent advances in electrodes for noninvasive recording of electroencephalograms expand opportunities collecting such data for diagnosis of neurological disorders and brain-computer interfaces. Existing technologies, however, cannot be used effectively in continuous, uninterrupted modes for more than a few days due to irritation and irreversible degradation in the electrical and mechanical properties of the skin interface. Here we introduce a soft, foldable collection of electrodes in open, fractal mesh geometries that can mount directly and chronically on the complex surface topology of the auricle and the mastoid, to provide high-fidelity and long-term capture of electroencephalograms in ways that avoid any significant thermal, electrical, or mechanical loading of the skin. Experimental and computational studies establish the fundamental aspects of the bending and stretching mechanics that enable this type of intimate integration on the highly irregular and textured surfaces of the auricle. Cell level tests and thermal imaging studies establish the biocompatibility and wearability of such systems, with examples of high-quality measurements over periods of 2 wk with devices that remain mounted throughout daily activities including vigorous exercise, swimming, sleeping, and bathing. Demonstrations include a text speller with a steady-state visually evoked potential-based brain-computer interface and elicitation of an event-related potential (P300 wave).
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107
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Takei K, Honda W, Harada S, Arie T, Akita S. Toward flexible and wearable human-interactive health-monitoring devices. Adv Healthc Mater 2015; 4:487-500. [PMID: 25425072 DOI: 10.1002/adhm.201400546] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 10/25/2014] [Indexed: 01/08/2023]
Abstract
This Progress Report introduces flexible wearable health-monitoring devices that interact with a person by detecting from and stimulating the body. Interactive health-monitoring devices should be highly flexible and attach to the body without awareness like a bandage. This type of wearable health-monitoring device will realize a new class of electronics, which will be applicable not only to health monitoring, but also to other electrical devices. However, to realize wearable health-monitoring devices, many obstacles must be overcome to economically form the active electrical components on a flexible substrate using macroscale fabrication processes. In particular, health-monitoring sensors and curing functions need to be integrated. Here recent developments and advancements toward flexible health-monitoring devices are presented, including conceptual designs of human-interactive devices.
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Affiliation(s)
- Kuniharu Takei
- Department of Physics and Electronics; Osaka Prefecture University; Sakai Osaka 599-8531 Japan
| | - Wataru Honda
- Department of Physics and Electronics; Osaka Prefecture University; Sakai Osaka 599-8531 Japan
| | - Shingo Harada
- Department of Physics and Electronics; Osaka Prefecture University; Sakai Osaka 599-8531 Japan
| | - Takayuki Arie
- Department of Physics and Electronics; Osaka Prefecture University; Sakai Osaka 599-8531 Japan
| | - Seiji Akita
- Department of Physics and Electronics; Osaka Prefecture University; Sakai Osaka 599-8531 Japan
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108
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Myers AC, Huang H, Zhu Y. Wearable silver nanowire dry electrodes for electrophysiological sensing. RSC Adv 2015. [DOI: 10.1039/c4ra15101a] [Citation(s) in RCA: 156] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
We present wearable dry electrodes made of silver nanowires for long-term electrophysiological sensing such as electrocardiography and electromyography.
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Affiliation(s)
- Amanda C. Myers
- Department of Mechanical and Aerospace Engineering
- North Carolina State University
- Raleigh
- USA
- Center for Advanced Self-Powered Systems of Integrated Sensors and Technologies (ASSIST)
| | - He Huang
- Joint Department of Biomedical Engineering
- North Carolina State University
- University of North Carolina at Chapel Hill
- Raleigh
- USA
| | - Yong Zhu
- Department of Mechanical and Aerospace Engineering
- North Carolina State University
- Raleigh
- USA
- Center for Advanced Self-Powered Systems of Integrated Sensors and Technologies (ASSIST)
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109
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Mostafalu P, Sonkusale S. A high-density nanowire electrode on paper for biomedical applications. RSC Adv 2015. [DOI: 10.1039/c4ra12373e] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Different types of nanowires made from platinum, nickel and copper are fabricated and patterned with microscale resolution on paper substrates and employed for biomedical applications.
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Affiliation(s)
- P. Mostafalu
- NanoLab
- Electrical and Computer Engineering Department
- Tufts University
- Medford
- USA
| | - S. Sonkusale
- NanoLab
- Electrical and Computer Engineering Department
- Tufts University
- Medford
- USA
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110
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Hattori Y, Falgout L, Lee W, Jung SY, Poon E, Lee JW, Na I, Geisler A, Sadhwani D, Zhang Y, Su Y, Wang X, Liu Z, Xia J, Cheng H, Webb RC, Bonifas AP, Won P, Jeong JW, Jang KI, Song YM, Nardone B, Nodzenski M, Fan JA, Huang Y, West DP, Paller AS, Alam M, Yeo WH, Rogers JA. Multifunctional skin-like electronics for quantitative, clinical monitoring of cutaneous wound healing. Adv Healthc Mater 2014; 3:1597-607. [PMID: 24668927 PMCID: PMC4177017 DOI: 10.1002/adhm.201400073] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Indexed: 11/08/2022]
Abstract
Non-invasive, biomedical devices have the potential to provide important, quantitative data for the assessment of skin diseases and wound healing. Traditional methods either rely on qualitative visual and tactile judgments of a professional and/or data obtained using instrumentation with forms that do not readily allow intimate integration with sensitive skin near a wound site. Here, an electronic sensor platform that can softly and reversibly laminate perilesionally at wounds to provide highly accurate, quantitative data of relevance to the management of surgical wound healing is reported. Clinical studies on patients using thermal sensors and actuators in fractal layouts provide precise time-dependent mapping of temperature and thermal conductivity of the skin near the wounds. Analytical and simulation results establish the fundamentals of the sensing modalities, the mechanics of the system, and strategies for optimized design. The use of this type of "epidermal" electronics system in a realistic clinical setting with human subjects establishes a set of practical procedures in disinfection, reuse, and protocols for quantitative measurement. The results have the potential to address important unmet needs in chronic wound management.
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Affiliation(s)
- Yoshiaki Hattori
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Leo Falgout
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Woosik Lee
- Department of Electrical Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Sung-Young Jung
- Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea
| | - Emily Poon
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Jung Woo Lee
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Ilyoun Na
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea
| | - Amelia Geisler
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Divya Sadhwani
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Yihui Zhang
- Department of Civil and Environmental Engineering, Department of Mechanical Engineering, Center for Engineering and Health and Skin Disease Research Center, Northwestern University, Evanston, IL 60208, USA
- Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China
| | - Yewang Su
- Department of Civil and Environmental Engineering, Department of Mechanical Engineering, Center for Engineering and Health and Skin Disease Research Center, Northwestern University, Evanston, IL 60208, USA
- Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China
| | - Xiaoqi Wang
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Zhuangjian Liu
- Institute of High Performance Computing, A*star, 1 Fusionopolis Way, #16-16, Connexis 138632, Singapore
| | - Jing Xia
- Department of Civil and Environmental Engineering, Department of Mechanical Engineering, Center for Engineering and Health and Skin Disease Research Center, Northwestern University, Evanston, IL 60208, USA
- Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China
| | - Huanyu Cheng
- Department of Civil and Environmental Engineering, Department of Mechanical Engineering, Center for Engineering and Health and Skin Disease Research Center, Northwestern University, Evanston, IL 60208, USA
| | - R. Chad Webb
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Andrew P. Bonifas
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Philip Won
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Jae-Woong Jeong
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Kyung-In Jang
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Young Min Song
- Department of Electronic Engineering, Pusan National University, Busan, 609-735, Republic of Korea
| | - Beatrice Nardone
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Michael Nodzenski
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Jonathan A. Fan
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yonggang Huang
- Department of Civil and Environmental Engineering, Department of Mechanical Engineering, Center for Engineering and Health and Skin Disease Research Center, Northwestern University, Evanston, IL 60208, USA
| | - Dennis P. West
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Amy S. Paller
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Murad Alam
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Woon-Hong Yeo
- Department of Mechanical and Nuclear Engineering and Institute for Engineering and Medicine, Virginia Commonwealth University, Richmond, VA 23284, USA
| | - John A. Rogers
- Department of Materials Science and Engineering, Beckman Institute for Advanced Science and Technology, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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111
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Liu B, Liu J, Wang G, Huang K, Li F, Zheng Y, Luo Y, Zhou F. A novel electrocardiogram parameterization algorithm and its application in myocardial infarction detection. Comput Biol Med 2014; 61:178-84. [PMID: 25201457 DOI: 10.1016/j.compbiomed.2014.08.010] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 08/11/2014] [Accepted: 08/11/2014] [Indexed: 11/15/2022]
Abstract
The electrocardiogram (ECG) is a biophysical electric signal generated by the heart muscle, and is one of the major measurements of how well a heart functions. Automatic ECG analysis algorithms usually extract the geometric or frequency-domain features of the ECG signals and have already significantly facilitated automatic ECG-based cardiac disease diagnosis. We propose a novel ECG feature by fitting a given ECG signal with a 20th order polynomial function, defined as PolyECG-S. The PolyECG-S feature is almost identical to the fitted ECG curve, measured by the Akaike information criterion (AIC), and achieved a 94.4% accuracy in detecting the Myocardial Infarction (MI) on the test dataset. Currently ST segment elongation is one of the major ways to detect MI (ST-elevation myocardial infarction, STEMI). However, many ECG signals have weak or even undetectable ST segments. Since PolyECG-S does not rely on the information of ST waves, it can be used as a complementary MI detection algorithm with the STEMI strategy. Overall, our results suggest that the PolyECG-S feature may satisfactorily reconstruct the fitted ECG curve, and is complementary to the existing ECG features for automatic cardiac function analysis.
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Affiliation(s)
- Bin Liu
- Cardiovascular Disease Center, First Hospital of Jilin University, Changchun 130021, Jilin, PR China
| | - Jikui Liu
- Shenzhen Institutes of Advanced Technology, and Key Lab for Health Informatics, Chinese Academy of Sciences, Shenzhen 518055, Guangdong, PR China
| | - Guoqing Wang
- Key Laboratory of Zoonosis, Ministry of Education, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin, PR China.
| | - Kun Huang
- Department of Biomedical Informatics, The Ohio State University, Columbus, OH 43210, USA
| | - Fan Li
- Key Laboratory of Zoonosis, Ministry of Education, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin, PR China
| | - Yang Zheng
- Cardiovascular Disease Center, First Hospital of Jilin University, Changchun 130021, Jilin, PR China
| | - Youxi Luo
- Shenzhen Institutes of Advanced Technology, and Key Lab for Health Informatics, Chinese Academy of Sciences, Shenzhen 518055, Guangdong, PR China; School of Science, Hubei University of Technology, Wuhan 430068, PR China
| | - Fengfeng Zhou
- Shenzhen Institutes of Advanced Technology, and Key Lab for Health Informatics, Chinese Academy of Sciences, Shenzhen 518055, Guangdong, PR China.
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112
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Self-adhesive epidermal carbon nanotube electronics for tether-free long-term continuous recording of biosignals. Sci Rep 2014; 4:6074. [PMID: 25123356 PMCID: PMC4133715 DOI: 10.1038/srep06074] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 06/30/2014] [Indexed: 12/11/2022] Open
Abstract
The long-term, continuous, inconspicuous, and noiseless monitoring of bioelectrical signals is critical to the early diagnosis of disease and monitoring health and wellbeing. However, it is a major challenge to record the bioelectrical signals of patients going about their daily lives because of the difficulties of integrating skin-like conducting materials, the measuring system, and medical technologies in a single platform. In this study, we developed a thin epidermis-like electronics that is capable of repeated self-adhesion onto skin, integration with commercial electronic components through soldering, and conformal contact without serious motion artifacts. Using well-mixed carbon nanotubes and adhesive polydimethylsiloxane, we fabricated an epidermal carbon nanotube electronics which maintains excellent conformal contact even within wrinkles in skin, and can be used to record electrocardiogram signals robustly. The electrode is biocompatible and can even be operated in water, which means patients can live normal lives despite wearing a complicated recording system.
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113
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