The Experts below are selected from a list of 39819 Experts worldwide ranked by ideXlab platform

Ni Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Textile-Enabled Highly Reproducible Flexible Pressure Sensors for Cardiovascular Monitoring
    Advanced Materials Technologies, 2017
    Co-Authors: Ningqi Luo, Jun Zhang, Xiaorong Ding, Zhiqiang Zhou, Quan Zhang, Yuan-ting Zhang, Shih-chi Chen, Ni Zhao
    Abstract:

    Flexible piezoresistive sensors (FPS) with high reproducibility and hysteresis-free pressure response are highly desirable for various emerging biomedical applications. In this work, the potential of using regularly interlaced textile materials to achieve high-repeatability and low-hysteresis FPS is explored. It is found that the structural flexibility and surface regularity of knitted fabric structures can in general provide reproducible pressure response; however, response fluctuations and hysteresis are still present due to the inevitable inelastic deformation of the textiles. To address this limitation, carbon black particles and polyvinylidene fluoride are introduced in the knitted fabric as the electrical and mechanical interconnects, respectively, between the fibers. Through composition optimization, the pressure response variation is reduced to below 2% and the hysteresis loop deviation is decreased to below 10% for single sensors. The performance variation among multiple sensors is as low as 5%, much smaller than the 33% variation of the sensors made with nonwoven fabrics. Utilizing the high sensor repeatability, sensor arrays and multisite sensor network are successfully realized for Monitoring superficial temporal artery pulse pressure and pulse wave velocity, which demonstrate the potential of using wearable sensing systems for multifunctional Cardiovascular Monitoring.

  • flexible organic inorganic hybrid near infrared photoplethysmogram sensor for Cardiovascular Monitoring
    Advanced Materials, 2017
    Co-Authors: Jing Liu, Ningqi Luo, Jie Zhang, Guodong Zhou, Ni Zhao
    Abstract:

    Wearable photoplethysmogram (PPG) sensors offer convenient and informative measurements for evaluating daily physiological states of individuals. In this work, epidermal and flexible near-infrared (NIR) PPG sensors integrating a low-power, high-sensitivity organic phototransistor (OPT) with a high-efficiency inorganic light-emitting diode are developed. By exploiting an organic bulk heterojunction active layer and a bilayer gate dielectric design, a low voltage (<3 V) operated OPT with NIR responsivity as high as 3.5 × 105 A W-1 and noise equivalent power of 1.2 × 10-15 W Hz-1/2 is achieved, greatly surpassing commercial available silicon-based photodetectors. In addition, the ultrathin encapsulation structure renders the device highly flexible and allows transfer printing of the device directly onto human skin. It is demonstrated that the epidermal/flexible PPG sensors are capable of continuously Monitoring heart rate variability and precisely tracking the changes of pulse pressure at different postures of human subjects with the aid of electrocardiogram Monitoring, exhibiting more reliable performance than commercial PPG sensors while consuming less power. The study suggests that the hybrid PPG sensor design may provide a promising solution for low-power, real-time physiological Monitoring.

Zhenan Bao - One of the best experts on this subject based on the ideXlab platform.

  • A Sensitive and Biodegradable Pressure Sensor Array for Cardiovascular Monitoring
    Advanced Materials, 2015
    Co-Authors: Clementine M. Boutry, Qudus Omotayo Lawal, Amanda Nguyen, Simon Rondeau-gagné, Alex Chortos, Zhenan Bao
    Abstract:

    An array of highly sensitive pressure sensors entirely made of biodegradable materials is presented, designed as a single-use flexible patch for application in Cardiovascular Monitoring. The high sensitivity in combination with fast response time is unprecedented when compared to recent reports on biodegradable pressure sensors (sensitivity three orders of magnitude higher), as illustrated by pulse wave velocity measurements, toward hypertension detection.

Catherine L Webb - One of the best experts on this subject based on the ideXlab platform.

  • Cardiovascular Monitoring of children and adolescents with heart disease receiving medications for attention deficit hyperactivity disorder a scientific statement from the american heart association council on Cardiovascular disease in the young cong
    Circulation, 2008
    Co-Authors: Victoria L Vetter, Josephine Elia, Christopher C Erickson, Stuart Berger, Nathan J Blum, Karen Uzark, Catherine L Webb
    Abstract:

    Over the past decade, concerns have been raised regarding the safety of a variety of psychotropic medications in children and adolescents, the appropriate selection of patients for therapy, and the indications for Cardiovascular Monitoring. In 1999, concerns over potential Cardiovascular effects of psychotropic drugs, especially tricyclic antidepressants1,2 but including stimulants, prompted the American Heart Association (AHA) scientific statement “Cardiovascular Monitoring of Children and Adolescents Receiving Psychotropic Drugs.”3 At that time, no specific Cardiovascular Monitoring was recommended for the use of stimulant medications. Since that time, a constellation of circumstances have come together, necessitating a second look at this complicated issue. These circumstances include an increased awareness of the presence of attention deficit/hyperactivity disorder (ADHD) in the general population and in children with preexisting cardiac conditions; public concerns about the side effects and toxicities of medications, especially psychotropic medications in children; and regulatory factors and warnings issued by the US Food and Drug Administration (FDA) and by the pharmaceutical industry in response to the FDA. This writing group was convened in response to FDA concerns with regard to the safety of the ADHD drugs and with regard to the identification of children with underlying Cardiovascular abnormalities. At a time when there is much discussion of the side effects of drugs and of the use of psychotropic drugs in children in the media and lay literature, it is particularly important for the medical profession to play a significant role in critically evaluating the use of stimulant medication in children, including those who may have undiagnosed heart disease and those who are known to have heart disease. The writing group for “Cardiovascular Monitoring of Children and Adolescents With Heart Disease Receiving Medications for Attention Deficit/Hyperactivity Disorder” reviewed the literature relevant to this topic since the last publication of the AHA scientific …

  • Cardiovascular Monitoring of Children and Adolescents With Heart Disease Receiving Medications for Attention Deficit/Hyperactivity Disorder A Scientific Statement From the American Heart Association Council on Cardiovascular Disease in the Young Cong
    Circulation, 2008
    Co-Authors: Victoria L Vetter, Josephine Elia, Christopher C Erickson, Stuart Berger, Nathan J Blum, Karen Uzark, Catherine L Webb
    Abstract:

    Over the past decade, concerns have been raised regarding the safety of a variety of psychotropic medications in children and adolescents, the appropriate selection of patients for therapy, and the indications for Cardiovascular Monitoring. In 1999, concerns over potential Cardiovascular effects of psychotropic drugs, especially tricyclic antidepressants1,2 but including stimulants, prompted the American Heart Association (AHA) scientific statement “Cardiovascular Monitoring of Children and Adolescents Receiving Psychotropic Drugs.”3 At that time, no specific Cardiovascular Monitoring was recommended for the use of stimulant medications. Since that time, a constellation of circumstances have come together, necessitating a second look at this complicated issue. These circumstances include an increased awareness of the presence of attention deficit/hyperactivity disorder (ADHD) in the general population and in children with preexisting cardiac conditions; public concerns about the side effects and toxicities of medications, especially psychotropic medications in children; and regulatory factors and warnings issued by the US Food and Drug Administration (FDA) and by the pharmaceutical industry in response to the FDA. This writing group was convened in response to FDA concerns with regard to the safety of the ADHD drugs and with regard to the identification of children with underlying Cardiovascular abnormalities. At a time when there is much discussion of the side effects of drugs and of the use of psychotropic drugs in children in the media and lay literature, it is particularly important for the medical profession to play a significant role in critically evaluating the use of stimulant medication in children, including those who may have undiagnosed heart disease and those who are known to have heart disease. The writing group for “Cardiovascular Monitoring of Children and Adolescents With Heart Disease Receiving Medications for Attention Deficit/Hyperactivity Disorder” reviewed the literature relevant to this topic since the last publication of the AHA scientific …

Ningqi Luo - One of the best experts on this subject based on the ideXlab platform.

  • Textile-Enabled Highly Reproducible Flexible Pressure Sensors for Cardiovascular Monitoring
    Advanced Materials Technologies, 2017
    Co-Authors: Ningqi Luo, Jun Zhang, Xiaorong Ding, Zhiqiang Zhou, Quan Zhang, Yuan-ting Zhang, Shih-chi Chen, Ni Zhao
    Abstract:

    Flexible piezoresistive sensors (FPS) with high reproducibility and hysteresis-free pressure response are highly desirable for various emerging biomedical applications. In this work, the potential of using regularly interlaced textile materials to achieve high-repeatability and low-hysteresis FPS is explored. It is found that the structural flexibility and surface regularity of knitted fabric structures can in general provide reproducible pressure response; however, response fluctuations and hysteresis are still present due to the inevitable inelastic deformation of the textiles. To address this limitation, carbon black particles and polyvinylidene fluoride are introduced in the knitted fabric as the electrical and mechanical interconnects, respectively, between the fibers. Through composition optimization, the pressure response variation is reduced to below 2% and the hysteresis loop deviation is decreased to below 10% for single sensors. The performance variation among multiple sensors is as low as 5%, much smaller than the 33% variation of the sensors made with nonwoven fabrics. Utilizing the high sensor repeatability, sensor arrays and multisite sensor network are successfully realized for Monitoring superficial temporal artery pulse pressure and pulse wave velocity, which demonstrate the potential of using wearable sensing systems for multifunctional Cardiovascular Monitoring.

  • flexible organic inorganic hybrid near infrared photoplethysmogram sensor for Cardiovascular Monitoring
    Advanced Materials, 2017
    Co-Authors: Jing Liu, Ningqi Luo, Jie Zhang, Guodong Zhou, Ni Zhao
    Abstract:

    Wearable photoplethysmogram (PPG) sensors offer convenient and informative measurements for evaluating daily physiological states of individuals. In this work, epidermal and flexible near-infrared (NIR) PPG sensors integrating a low-power, high-sensitivity organic phototransistor (OPT) with a high-efficiency inorganic light-emitting diode are developed. By exploiting an organic bulk heterojunction active layer and a bilayer gate dielectric design, a low voltage (<3 V) operated OPT with NIR responsivity as high as 3.5 × 105 A W-1 and noise equivalent power of 1.2 × 10-15 W Hz-1/2 is achieved, greatly surpassing commercial available silicon-based photodetectors. In addition, the ultrathin encapsulation structure renders the device highly flexible and allows transfer printing of the device directly onto human skin. It is demonstrated that the epidermal/flexible PPG sensors are capable of continuously Monitoring heart rate variability and precisely tracking the changes of pulse pressure at different postures of human subjects with the aid of electrocardiogram Monitoring, exhibiting more reliable performance than commercial PPG sensors while consuming less power. The study suggests that the hybrid PPG sensor design may provide a promising solution for low-power, real-time physiological Monitoring.

Clementine M. Boutry - One of the best experts on this subject based on the ideXlab platform.

  • A Sensitive and Biodegradable Pressure Sensor Array for Cardiovascular Monitoring
    Advanced Materials, 2015
    Co-Authors: Clementine M. Boutry, Qudus Omotayo Lawal, Amanda Nguyen, Simon Rondeau-gagné, Alex Chortos, Zhenan Bao
    Abstract:

    An array of highly sensitive pressure sensors entirely made of biodegradable materials is presented, designed as a single-use flexible patch for application in Cardiovascular Monitoring. The high sensitivity in combination with fast response time is unprecedented when compared to recent reports on biodegradable pressure sensors (sensitivity three orders of magnitude higher), as illustrated by pulse wave velocity measurements, toward hypertension detection.