Cardiopulmonary monitoring by textile electrodes without subject-awareness of being monitored

Ishijima, Masa

doi:10.1007/bf02510978

Cited by 68 publications

(34 citation statements)

References 6 publications

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“…For example, an unconstrained monitoring method of electrocardiogram (ECG) and respiration for sleeping subjects uses textile electrodes sewn into a bed sheet (ISHIJIMA, 1997), and a monitoring method of ECG in bathtubs uses electrodes attached to both sides of the bath (ISHIJIMA and TOGAWA, 1989). With these methods, however, subjects must be electrically connected to the electrodes, and the ECG is measured only when the subjects are on the electrodes installed in the sheet, for the former, and when the subjects are in the bath, for the latter.…”

Section: Introductionmentioning

confidence: 99%

Unconstrained and non-invasive measurement of heart-beat and respiration periods using a phonocardiographic sensor

Tanaka

Matsumoto²,

Wakimoto

2002

Med Bio Eng Comput

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With the rapid growth in the number of elderly people in the population, interest in health monitoring is increasing. Therefore the development of an unconstrained and non-invasive vital signs measurement system could be important for monitoring health status at home or in hospitals or nursing facilities. A simple system is proposed for measuring heart-beat and respiration periods for home healthcare. This was achieved with a phonocardiographic (PCG) sensor set on a water-mat or air-mat. The PCG sensor was an acceleration sensor that extracted the vibration of the mat caused by heart-beat and respiration. By calculating an autocorrelation function of the fully rectified sensor output or by local pattern matching between the rectified output and a reference signal (pre-memorised for each subject), the system measured the average and instantaneous periods of both heart-beat and respiration. Results showed that these periods were measured to a similar level of accuracy as for the electrocardiogram and thermistor respiration pickup. The comparative accuracies were within the following ranges: average heartbeat 0.19% to 0.67%, instantaneous heartbeat 0.53% to 1.15%, average respiration 0.51% to 2.17%, and instantaneous respiration 2.51% to 5.20%.

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Section: Introductionmentioning

confidence: 99%

Unconstrained and non-invasive measurement of heart-beat and respiration periods using a phonocardiographic sensor

Tanaka

Matsumoto²,

Wakimoto

2002

Med Bio Eng Comput

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“…The bedsheet electrode is woven with electrically conductive textiles, which consist of silverplated polymer fibers [1]. Textile electrodes are placed on and underneath a regular bed-sheet, which is made of nonconductive cotton fibers, one for cardiac and the other for respiratory activities, respectively.…”

Section: Bedroom Environmentmentioning

confidence: 99%

Unobtrusive approaches to monitoring vital signs at home

Ishijima

2007

Med Bio Eng Comput

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Monitoring of vital signs such as those by electrocardiogram (ECG) or respiratory activities everyday is significant even for healthy people since it would help locate acute or undetermined disorders before they become fatal. Monitoring of vital signs is done with sensors installed in household furniture or appliances, which come into direct contact with the body unobtrusively in everyday life. The data acquired with this modality are sometimes contaminated by various artifacts. Statistical procedures, however, extract meaningful outcome as the amount of data generated is enormous. A long-term monitoring on the stress ECG with this modality for 2 years was investigated. The result revealed a biological cycle wherein the recovery speed from the stress slowed down. It suggests that the unobtrusive monitoring produces a long-term health data that enable predicting of possible disorders in the near future.

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“…Ishijima [6] and Park et al [7] proposed methods for simultaneous measurement of ECG and respiratory movement (RM) signals using textile electrodes. However, their ECG measurements required direct contact with the skin.…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Simultaneous Measurements of Electrocardiogram and Respiratory Movements Using Capacitive Sheet Electrodes

Takano

Yamagishi

Ohmuta

et al. 2017

ABE

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In this study, we improved upon a high-input impedance monitoring device comprising capacitive sheet electrodes placed under a bed sheet, aiming to detect all ECG waves including T waves. To accomplish this, we widened the passbands for ECG and respiratory movement (RM) signals. However, because this widening may lower noise tolerance, we substituted conventional front-end buffers with buffers able to discharge DC potential. Further, the backside of the modi ed electrode was doubly shielded by using the electric potential of the buffer s output and ground. We also introduced a virtual midpoint circuit to realize stable ECG and independent RM measurements of the chest and abdomen with the goal to detect obstructive sleep apnea in future applications. We tested our device on seven healthy adults during a six-hour sleep experiment. In all subjects, we detected T waves and observed ECG and RM signals in supine and lateral positions. In experiments in which respiratory rate was changed at regular intervals, the RM signal was synchronized with the simultaneously measured reference signal. The sensitivity and accuracy of R waves averaged over all subjects were 93.2% and 92.9%, respectively. Both averaged sensitivity and accuracy for T waves were 94.5%, while averaged accuracy of chest and abdominal RM was 70.9% and 74.0%, respectively. The results for ECG signals indicate that our improved system is applicable to unconstrained monitoring of vital signs in adults. Although there is still room for improvement in RM measurements, the results suggest that our system may also be used to detect variations in breathing.

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Cardiopulmonary monitoring by textile electrodes without subject-awareness of being monitored

Cited by 68 publications

References 6 publications

Unconstrained and non-invasive measurement of heart-beat and respiration periods using a phonocardiographic sensor

Unconstrained and non-invasive measurement of heart-beat and respiration periods using a phonocardiographic sensor

Unobtrusive approaches to monitoring vital signs at home

Non-Contact Simultaneous Measurements of Electrocardiogram and Respiratory Movements Using Capacitive Sheet Electrodes

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