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Method for accurately extracting cuff pressure shockwave

A shock wave and cuff technology, applied in the field of medical equipment, can solve problems such as poor robustness and ineffective suppression of interference

Active Publication Date: 2014-05-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, the interference suppression effect of these methods is not obvious, and the robustness is poor.

Method used

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  • Method for accurately extracting cuff pressure shockwave
  • Method for accurately extracting cuff pressure shockwave
  • Method for accurately extracting cuff pressure shockwave

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Embodiment Construction

[0035] The principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] see figure 1 , the pressure shock wave signal collected through the cuff is derived from the joint action of the heart's periodic blood pumping and the cuff inflation and deflation process. The periodic beating of the heart can be simulated as a sinusoidal signal u(t)=A 1 sin(2pf c t), where f c is the beating frequency of the heart. After u(t) passes through the nonlinear link f(u), the output is m(t), which contains multiple harmonics. Respiration performs partial amplitude modulation on m(t), the modulation function is expressed as 1+r(t), and the output after respiration modulation is p(t). The cuff pressure g(t) performs amplitude modulation on p(t) again, the modulation function is expressed as g(t), and the output after pressure modulation is q(t). n(t) represents the interference in the measurement process, and its nature is addi...

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Abstract

Provided is a method for accurately extracting a cuff pressure shockwave under a complex interference environment. An improved bispectrum technology is utilized, cardiac impulse frequency is obtained from an original cuff pressure shockwave, a zero-phase narrow-band band-pass filter is utilized for respectively extracting three narrow-band ingredients in the cuff pressure shockwave according to the obtained cardiac impulse frequency, and the three extracted narrow-band ingredients are directly added to obtain a refactoring pressure shockwave with interference removed. The method can be used for oscillography blood pressure measurement in a booster measurement mode, and can also be used for oscillography blood pressure measurement in a depressurization measurement mode.

Description

technical field [0001] The invention belongs to the technical field of medical instruments, in particular to a method for accurately extracting cuff pressure shock waves. Background technique [0002] Blood pressure is an important indicator that reflects physiological parameters such as cardiac pumping function, vascular resistance, blood viscosity, and systemic blood volume, and has been widely used clinically. Blood pressure has obvious time-varying characteristics, and single or few blood pressure measurements in clinics cannot reliably reflect blood pressure fluctuations and conditions under activity. Ambulatory blood pressure monitoring is a diagnostic technique that automatically and periodically measures blood pressure in daily life within 24 hours. Since the ambulatory blood pressure overcomes the limitations of less blood pressure measurements in clinics, observation errors, and white coat effects, etc., and can objectively reflect the actual level and fluctuation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/022
Inventor 闫相国吴宁王刚
Owner XI AN JIAOTONG UNIV
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