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Search Results (2)

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Keywords = arterial pulsimeter

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1043 KiB  
Article
Measurement of Spatial Pulse Wave Velocity by Using a Clip-Type Pulsimeter Equipped with a Hall Sensor and Photoplethysmography
by Dong-Hyun Nam, Woo-Beom Lee, You-Sik Hong and Sang-Suk Lee
Sensors 2013, 13(4), 4714-4723; https://doi.org/10.3390/s130404714 - 9 Apr 2013
Cited by 39 | Viewed by 16236
Abstract
A prototype of a clip-type pulsimeter equipped with a magnetic field-sensing semiconductor Hall sensor was developed. It has a permanent magnet attached in the “Chwan” position to the center of a radial artery. The clip-type pulsimeter is composed of a hardware system measuring [...] Read more.
A prototype of a clip-type pulsimeter equipped with a magnetic field-sensing semiconductor Hall sensor was developed. It has a permanent magnet attached in the “Chwan” position to the center of a radial artery. The clip-type pulsimeter is composed of a hardware system measuring voltage signals. To measure spatial pulse wave velocity (SPWV), the signal from the radial artery pulsimeter and that from the photoplethysmography (PPG) were simultaneously compared. The pulse wave data from a clinical test of 39 clinical participants (male:female = 25:14) with a mean age of 24.36 (±2.35) years was analyzed. The mean SPWV, which was simultaneously measured from the radial artery pulsimeter and PPG, was 0.8 m/s. We suggest the SPWV results were higher for men than women, because of the better vascularity of terminal tissue in men. The findings of this research may be useful for developing a biomedical signal storage device for a U-health-care system. Full article
(This article belongs to the Section Physical Sensors)
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<p>(<b>a</b>) The notation and function of several major parts and (<b>b</b>) the measurement process of acquisition pulse signals by a real clip-type pulsimeter.</p> Full article ">
<p>Schematic diagram of the three-dimensional motion of the radial artery, showing the relation between arterial pulse motionand blood flow in the radial artery. Here the maximum point means the largest diameter and blood velocity of the radial artery.</p> Full article ">
<p>A schematic diagram of the simultaneous SPWV measurement method using a radial artery pulse waveform and PPG pulse waveform. The SPWV defines SPWV = <span class="html-italic">L</span><sub>H</sub>/Δτ. Here, <span class="html-italic">L</span><sub>H</sub> and Δτ are a hand length from artery wrist to index finger and a time interval of phase difference between two peaks of pulse waveforms, respectively.</p> Full article ">
<p>Radial artery pulse and PPG waves obtained from the simultaneous measurements by the clip-type pulsimeter and the PPG meter mounted on the wrist and fingertip, respectively, of the subject's left.</p> Full article ">
<p>Radial artery pulse graph and PPG signals obtained from the simultaneous measurements by the clip-type pulsimeter and PPG meter mounted on the wrist and fingertip of the left hand. Here, Δτ<sub>i</sub> is the time interval measured from ith phase difference of the two pulse waveforms.</p> Full article ">
<p>Configuration of electrocardiograph (ECG) and radial artery pulsimeter for the measurement of PWV. Here <span class="html-italic">R</span><sub>P</sub>, <span class="html-italic">R</span><sub>D</sub>, <span class="html-italic">H</span><sub>P</sub>, and <span class="html-italic">H</span><sub>D</sub> are maximum peaks of the ECG pulse waves, distance of aortic valve position, starting point of radial artery pulse wave, and distance of radial wrist position, respectively. Here, the red filled circle and the red solid line are the exact position of aortic valve and the rough distance from aortic valve to wrist, respectively.</p> Full article ">
403 KiB  
Article
Measurement of Blood Pressure Using an Arterial Pulsimeter Equipped with a Hall Device
by Sang-Suk Lee, Dong-Hyun Nam, You-Sik Hong, Woo-Beom Lee, Il-Ho Son, Keun-Ho Kim and Jong-Gu Choi
Sensors 2011, 11(2), 1784-1793; https://doi.org/10.3390/s110201784 - 31 Jan 2011
Cited by 35 | Viewed by 17012
Abstract
To measure precise blood pressure (BP) and pulse rate without using a cuff, we have developed an arterial pulsimeter consisting of a small, portable apparatus incorporating a Hall device. Regression analysis of the pulse wave measured during testing of the arterial pulsimeter was [...] Read more.
To measure precise blood pressure (BP) and pulse rate without using a cuff, we have developed an arterial pulsimeter consisting of a small, portable apparatus incorporating a Hall device. Regression analysis of the pulse wave measured during testing of the arterial pulsimeter was conducted using two equations of the BP algorithm. The estimated values of BP obtained by the cuffless arterial pulsimeter over 5 s were compared with values obtained using electronic or liquid mercury BP meters. The standard deviation between the estimated values and the measured values for systolic and diastolic BP were 8.3 and 4.9, respectively, which are close to the range of values of the BP International Standard. Detailed analysis of the pulse wave measured by the cuffless radial artery pulsimeter by detecting changes in the magnetic field can be used to develop a new diagnostic algorithm for BP, which can be applied to new medical apparatus such as the radial artery pulsimeter. Full article
(This article belongs to the Special Issue Advanced Sensing Technology for Nondestructive Evaluation)
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<p>Diagram showing the basic structure of the wrist wearable radial arterial pulsimeter. Schematic cross-section of one form of the pulse-sensing and skin-contacting components of the arterial pulsimeter using multiple Hall devices and permanent magnets, respectively. The pressure chamber between the skin-contacting and pulse-sensing components is filled with air.</p> Full article ">
<p><b>(a)</b> PCB pulse-sensing component mounted with a multiple 5 × 9 = 45 array of Hall devices corresponding to the permanent magnets underneath. <b>(b)</b> A graph of output voltage versus magnetic field for the commercial, A3515-and A3516-type Hall device showing high sensitivity of 1.2 mV/Oe and linearity in the magnetic field and temperature range from −5 Oe to +5 Oe and from −40 °C, to +150 °C, respectively.</p> Full article ">
<p>Typical pulse waveform of 1 point obtained by the compositional analysis of pulse signal of the clinical product testing of the pulsimeter using Hall device. Example of measuring time (seconds) versus temporally typical signal of 1 point pulse obtained from the analysis of an arbitrary pulse signal of 1 position of a small permanent magnet.</p> Full article ">
<p><b>(a)</b> Typical real features of a pulse wave and a first pulse wave combined to provide the main pulse and the reflective pulse. <b>(b)</b> Regression analysis equation for the estimated algorithm of blood pressure needs the following 6 major correlative factors; (1) the period of the pulse wave, (2) the time of the systolic period, (3) the reflective time, (4) the notch time, (5) the ratio of area (systolic period area/diastolic period area), and (6) the increasing pressure index (reflective wave peak/systolic wave peak).</p> Full article ">
<p>Photographs of the arterial pulsimeter with Hall device in clinical tests. Here the weight and power consumption of the wrist wearable, radial arterial pulsimeter are 80 g and 1.65 W, respectively. The product testing of the proposed arterial pulsimeter and the measuring feature, which are a wristwatch or bracelet, transfer the increased pressure to the skin-contacting part intact when the pressure of the constant pressure chamber is increased.</p> Full article ">
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