On the Road to a Textile Integrated Bioimpedance Early Warning System for Lung Edema

Schlebusch, Thomas; Röthlingshöfer, Lisa; Kim, Saim; Köny, Marcus; Leonhardt, Steffen

doi:10.1109/bsn.2010.21

Cited by 19 publications

(18 citation statements)

References 16 publications

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“…For this reason, COTS based platforms are ideal for the development of accurate data acquisition approaches and for clinical data collection. The form factor of COTS based platforms can be small (volume <1 cm 3 , weight <100 g [11]) and wearable, using either skin mountable [12] or Velcro chest strap designs [13], although many COTS nodes remain several cm's on a side. Their energy inefficiencies may ultimately limit the full deployment of COTS designs in a wide range of emerging healthcare applications, as it is difficult to prolong the battery lifetime of a COTS platform to much more than 1 day [14] [15].…”

Section: B Hardware For Bsnsmentioning

confidence: 99%

“…A survey across different platforms shows that the 868 MHz unregulated band [14][16] and the 2.4 GHz band [15] are popular for COTS platforms, since they provide easy integration with the larger system. The power consumption of these radios makes the COTS node power alarmingly high, often reaching the several 100 mW range [11][17] [16] (500 mW for [17]). Use of these radios, while convenient, supports data rates that dramatically exceed the requirement for most BSN applications.…”

Section: B Hardware For Bsnsmentioning

confidence: 99%

“…Use of these radios, while convenient, supports data rates that dramatically exceed the requirement for most BSN applications. The frequency of physiological signals typically range from the 1 Hz to100's kHz range [11], and data rates in transmission and receiving typically only range up to 100's of kpbs [14] [17]. A more suitable radio would help to reduce the power of COTS nodes, but convenience seems to trump power as the parameter influencing radio choice in most existing COTS designs.…”

Section: B Hardware For Bsnsmentioning

confidence: 99%

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Body Sensor Networks: A Holistic Approach From Silicon to Users

et al. 2012

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Abstract-Body sensor networks (BSN) are emerging cyberphysical systems that promise to improve quality of life through improved healthcare, augmented sensing and actuation for the disabled, independent living for the elderly, and reduced healthcare costs. However, the physical nature of BSNs introduces new challenges. The human body is a highly dynamic physical environment that creates constantly changing demands on sensing, actuation, and quality of service. Movement between indoor and outdoor environments and physical movements constantly change the wireless channel characteristics. These dynamic application contexts can also have a dramatic impact on data and resource prioritization. Thus, BSNs must simultaneously deal with rapid changes to both top-down application requirements and bottom-up resource availability. This is made all the more challenging by the wearable nature of BSN devices, which necessitates a vanishingly small size and, therefore, extremely limited hardware resources and power budget. Current research is being performed to develop new principles and techniques for adaptive operation in highly dynamic physical environments, using miniaturized, energy-constrained devices. This paper describes a holistic cross-layer approach that addresses all aspects of the system, from low-level hardware design to higher-level communication and data fusion algorithms, to top-level applications.

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Section: B Hardware For Bsnsmentioning

confidence: 99%

Section: B Hardware For Bsnsmentioning

confidence: 99%

Section: B Hardware For Bsnsmentioning

confidence: 99%

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Body Sensor Networks: A Holistic Approach From Silicon to Users

et al. 2012

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“…Bioimpedance is another field, where DFT-based measurement systems have been developed [31][32][33][34], many targeting applications in functional textiles and wearable electronics [35][36][37][38]. Related systems include a miniaturized blood coagulation monitoring device developed in [39] and the biosensor platform described in [40].…”

Section: Bioimpedancementioning

confidence: 99%

Improving Performance and Versatility of Systems Based on Single-Frequency DFT Detectors Such as AD5933

Matsiev

2014

Electronics

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Abstract:Turning grand concepts such as the Internet of Things (IoT) and Smart Cities into reality requires the development and deployment of a wide variety of computing devices incorporated into the Internet infrastructure. Unsupervised sensing is the cornerstone capability that these devices must have to perform useful functions, while also having low cost of acquisition and ownership, little energy consumption and a small footprint. Impedimetric sensing systems based on the so-called single-frequency DFT detectors possess many of these desirable attributes and are often introduced in remote monitoring and wearable devices. This study presents new methods of improving performance of such detectors. It demonstrates that the main source of systematic errors is the discontinuous test phasor causing the crosstalk between the in-phase and quadrature outputs and the leakage of the input signal. The study derives expressions for these errors as a function of the number of samples and operating frequency, and provides methods for correction. The proposed methods are applied to the operation of a practical device-a network analyzer integrated circuit AD5933-and discussed in detail. These methods achieve complete elimination of leakage errors and expansion of the low limit of the operation frequency range by nearly two decades without additional hardware.

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“…Since these processes usually transport a lot of blood, the resulting change of impedance is much higher than the pulsatile component of the heart. Beside the usual conductive coupling of a wearable bioelectrical impedance measurement, textile integrated impedance cardiography or spectroscopy for personal health care applications is currently under research [6,7,8]. An alternative contactless method to measure the impedance of the thoracic region is the use of wearable magnetic induction systems.…”

Section: Introductionmentioning

confidence: 99%

Development of a real-time, semi-capacitive impedance phlebography device

Weyer

Weber

Kleeberg

et al. 2015

Journal of Electrical Bioimpedance

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Chronic venous insufficiency of the lower limbs is a disease which is caused by an increased blood pressure inside the veins of the leg and the resulting increase of the contained blood volume. This work focuses on developing a device which uses impedance plethysmography, also known as impedance phlebography, to obtain information about the blood volume in the lower leg and provides the possibility to measure the impedance semi contact-less, e.g. through compression stockings. Furthermore a real-time beat-to-beat interval detection algorithm was implemented. Finally, the function of the developed impedance measuring system and the whole system was verified by comparing it with a gold standard. In comparison to the conductive coupling, the system performed similarly. The analysis showed that the developed system is suitable for semi-capacitive IPG. The algorithm was implemented conservatively since it provided a good false-positive rate of 0 %, but only a moderate sensitivity of about 68 %. Reliable and continuous measurement of the pulse signal was only possible in periods of immobility.

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On the Road to a Textile Integrated Bioimpedance Early Warning System for Lung Edema

Cited by 19 publications

References 16 publications

Body Sensor Networks: A Holistic Approach From Silicon to Users

Body Sensor Networks: A Holistic Approach From Silicon to Users

Improving Performance and Versatility of Systems Based on Single-Frequency DFT Detectors Such as AD5933

Development of a real-time, semi-capacitive impedance phlebography device

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