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Systems and methods for contactless arterial pressure estimator

An arterial pressure and arterial pressure technology, applied in applications, sensors, blood vessel evaluation, etc., can solve the problems of unrealistic calibration measurement, unrealistic measurement of PWV arterial blood pressure, and unrealistic absolute time-varying blood volume calibration measurement.

Inactive Publication Date: 2017-03-22
SENSIFREE
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This method is flawed for at least two reasons: (1) PWV depends on the cross-sectional diameter of the arterial tree and its elasticity, not on ventricular volume, so PWV cannot be used as the only measure used to calculate arterial blood pressure; and (2 ) using a single parameter to estimate SBP and DPB means that SBP and DBP are mathematically related such that DBP can be calculated as long as SBP is given, but it is known that these two values ​​​​are independent of each other, otherwise measuring both SBP and DPB has no significance
This pressure varies uncontrollably as the subject moves, so a calibrated measurement of absolute time-varying blood volume in the skin is impractical
Especially when the above calibration is performed by changing the position of the limbs, the above calibration measurements are even more unrealistic

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  • Systems and methods for contactless arterial pressure estimator
  • Systems and methods for contactless arterial pressure estimator
  • Systems and methods for contactless arterial pressure estimator

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Embodiment Construction

[0045] In some embodiments, ultrawideband (UWB) microwave signals are irradiated into body tissue, preferably into body locations where arteries are close to the skin. This location can be over the radial artery at the wrist. In some embodiments, the reflected signal is a complex sum of multiple reflections, each reflection representing a signal reflected from successively rising depths in body tissue caused by complex permittivity changes in boundaries of different tissue layers. exist figure 1 A simplified example of these tissue layers is described in , which represents a cross-section of a subject's arm near the wrist (which according to some embodiments is a preferred location for attaching a device / system / device). As shown, 102 represents the skin layer, 104 represents the radial artery, 106 represents muscle tissue and 108 represents bone. The size of each reflection (referred to as S in the following t , t is the specific tissue causing the reflection) represents th...

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Abstract

Methods, apparatuses, devices and systems for measuring the arterial blood pressure in humans and mammals by estimating the time varying arterial diameter using electromagnetic fields in the microwave spectrum (for example), are disclosed. Embodiments may be suitable for wearable devices, and for use by medical practitioners.

Description

technical field [0001] The present invention relates to blood pressure measurement. [0002] Embodiments of the present disclosure provide methods, devices, devices and systems for measuring arterial blood pressure in humans and mammals. These embodiments use, for example, electromagnetic fields in the microwave spectral range to estimate time-varying arterial diameter. These approaches can be adapted for wearable devices as well as for use by medical practitioners. Background technique [0003] Sphygmomanometers are currently the most widely used non-invasive device for measuring arterial blood pressure. The detection methods used for this device are the auscultatory technique (Riva-Rocci 1896, Korotkoff 1905) and oscillometric measurements (Geddes 1970). Korotkoff's auscultatory method is the gold standard for noninvasive arterial blood pressure measurement. [0004] Methods that attempt to estimate arterial blood pressure from pulse wave velocity (eg, Surendhra Goli J...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/02
CPCA61B5/021A61B5/02438A61B5/0507A61B5/681A61B5/725A61B5/7257A61B2560/0223A61B2562/0228
Inventor 伊兰·巴拉克
Owner SENSIFREE
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