Topic
Sphygmograph
About: Sphygmograph is a research topic. Over the lifetime, 46 publications have been published within this topic receiving 222 citations.
Papers
TL;DR: The history of the blood pressure (BP) concept and measurements is described and Nikolai Korotkoff was the first to observe the sounds made by the constriction of the artery in 1905.
Abstract: The history of the blood pressure (BP) concept and measurements is described. Many scientists were involved. Among them, major triumphs were achieved by William Harvey during the early 1600s who announced that there is a finite amount of blood that circulated the body in one direction only. In the mid-1700s, Reverend Stephen Hales reported the first invasive measurement in horses and smaller animals. Poiseuille introduced in the early 1800s the mercury hydrodynometer and the mmHg units. Karl von-Vierordt described in 1855 that with enough pressure, the arterial pulse could be obliterated. He also created the sphygmograph, a pulse recorder usable for routine non-invasive monitoring on humans. In 1881, von Basch created the sphygmomanometer and the first non-invasive BP measurements. However, in 1896, Scipione Riva-Rocci developed further the mercury sphygmomanometer, almost as we know it today. The sphygmomanometer could only be used to determine the systolic BP. Observing the pulse disappearance via palpitation would only allow the measuring physician to observe the point when the artery was fully constricted. Nikolai Korotkoff was the first to observe the sounds made by the constriction of the artery in 1905.
70 citations
TL;DR: A novel application of the bidirectional audio microphones in mobile phones to measure biosignals for ubiquitous health monitoring, using the microphone as a sphygmograph at the fingertip, a stethoscope in which a delay time sensor of pulse wave arrivals from the neck near the carotid or chest near the heart to the fingertIP is detected.
Abstract: This paper describes a novel application of the bidirectional audio microphones in mobile phones to measure biosignals for ubiquitous health monitoring. The bidirectional microphone has two pressure-detecting ports. A pressure-detecting film receives the differential pressure between the ports. We apply this idea to biosignal measurements for a mobile phone. We used the microphone as 1) a sphygmograph at the fingertip, 2) a stethoscope in which a delay time sensor of pulse wave arrivals from the neck near the carotid or chest near the heart to the fingertip, and 3) a bed sensing device for biosignals. When used as a sphygmograph, it detects the wave similar to the second derivative of the conventional optical pulse oxymeter output wave. When used as a stethoscope, it detects cardiac sound and the pulse wave and respiration. With two microphones, the delay time from the neck carotid to the fingertip is detected.
9 citations
TL;DR: The sphygmograph has be come, among others, an instrument familiar to most interested in science, and a detailed and truthful record can be easily obtained of the modifications in the diameter of any superficial artery.
Abstract: The graphic method of representing the various phenomena occurring in the body during life, which has been so much developed by MM. Marey and Chauveau of Paris, has placed within our reach great facilities for obtaining an accurate knowledge of the relations, in point of time, of mutually dependent physiological events, and the sphygmograph has be come, among others, an instrument familiar to most interested in science. By means of this instrument, a detailed and truthful record can be easily obtained of the modifications in the diameter of any superficial artery, and, as usually constructed, it is intended to be applied to the radial at the wrist.
9 citations
Journal Article•
TL;DR: An indirect method is described for the estimation of systolic and diastolic blood pressures in the unanesthetized dog and a new type of sphygmograph of sufficient delicacy to record the pulsations from an artery as small as the femoral artery of the dog.
Abstract: An indirect method is described for the estimation of systolic and diastolic blood pressures in the unanesthetized dog. The apparatus is a sphygmomanometer equipped with a special type of cuff which permits of compression of the artery without distortion of the leg, and a new type of sphygmograph of sufficient delicacy to record the pulsations from an artery as small as the femoral artery of the dog.
8 citations
Patent•
1 Nov 1996TL;DR: In this article, a microcomputer detects the radial artery wavefrom of an object through a sphygmograph, and fetches a stroke output of the object from an output meter.
Abstract: An apparatus for uninvasively evaluating hemodynamic parameters, particularly a sphygmographic analyzer for evaluating vessel compliance and flow resistance in the central and peripheral portions of the artery system separately. A microcomputer (4) detects the radial artery wavefrom of an object through a sphygmograph (1), and fetches a stroke output of the object from an output meter. Next, the value of each of the five elements that constitute an electric circuit simulating the artery system ranging from the central portion to the peripheral portion of the living body is adjusted on the basis of the stroke output so that when an electric signal corresponding to a pressure wave of the aortic origin of the object is applied to the electric circuit, its response waveform corresponds to the radial artery waveform, and the resulting value of each element is outputted as the hemodynamic parameter. Further, the pulse waveform, the maximum blood pressure value and the minimum blood pressure value at the aortic origin are calculated from the value of each element, and the calculation result is outputted to an output device (6).
7 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2018 | 1 |
| 2017 | 1 |
| 2016 | 2 |
| 2014 | 4 |
| 2013 | 1 |