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Non-invasive cardiac output detecting methods and apparatus based on sphygmus wave

A technology of cardiac output and detection devices, which can be used to measure pulse rate/heart rate, blood flow measurement, catheters, etc., and can solve invasive problems

Inactive Publication Date: 2008-05-14
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although peripheral arterial blood pressure waves are relatively easy to detect, they are invasive

Method used

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  • Non-invasive cardiac output detecting methods and apparatus based on sphygmus wave
  • Non-invasive cardiac output detecting methods and apparatus based on sphygmus wave
  • Non-invasive cardiac output detecting methods and apparatus based on sphygmus wave

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Embodiment Construction

[0051] FIG. 1 shows a flow chart of the pulse wave-based non-invasive cardiac output detection method of the present invention. Use the pulse wave detection device shown in Figure 2 to detect the pulse wave at the body detection part (such as the neck), convert it into a digital signal after a series of processing, and then apply the mathematical analysis method to analyze the digital signal, and then estimate the heart rate. output and heart rate. The pulse wave detection device shown in Fig. 2 comprises a sensor 1 and a fixed bracket 2, the sensor 1 adopts a piezoresistive sensor, the fixed bracket 2 is composed of a fixed seat 3 and a sliding block 4, the sensor 1 is fixed in the sliding block 4, and the sliding block 4 Two sides are respectively provided with a card falcon 5, and pressing the card falcon 5 can make the sliding block 4 slide horizontally along the guide rail on the fixing seat 3. There are three positioning marks on one side of the fixed base 3: axial posi...

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Abstract

The invention provides a non-invasive cardiac output detection method and apparatus based on a pulse wave; wherein, the detection method comprises the following steps: firstly, amplifying and filtering the pressure pulse signals, and detaching the alternating current and direct current by means of amplifying and filtering; secondly, modulus conversion for the alternating current and direct current, and resampling the digital signals converted; fixing heart rate via the feature points on the waveform of the pulse; and fixing the external pressurizing force via calibrating the separated direct current; thirdly, using mathematical analyzing method to estimate time constant Tau for the separated alternating current; fourthly, calibrating the pulse wave to get mean arterial pressure MAP; fifthly, according to the MAP and Tau, calculating the cardiac output. The detecting apparatus comprises a pulse wave detection device, a detection circuit, a cardiac output estimation device and a display unit. The invention has the advantages of obtaining the cardiac output via a mathematical analyzing of the pulse wave on the non-invasive detection and realizing the non-invasive cardiac output detection.

Description

technical field [0001] The invention relates to a detection method and a device for obtaining cardiac output CO and heart rate HR by detecting the pulse wave of a living body, and belongs to the technical field of human body parameter detection of biomedical engineering. Background technique [0002] Cardiac output detection methods that meet clinical needs should be non-invasive, highly accurate, and low-cost. Unfortunately, none of the traditional cardiac output detection methods can satisfy the above-mentioned characteristics. For example, thermodilution, used in intensive care units and surgery, although relatively inexpensive, cannot be performed continuously. Its safety has been questioned because it requires pulmonary artery catheterization, and because the method is based on many assumptions, it is not very accurate. A more accurate cardiac output detection method is to measure blood flow in real time by placing an ultrasonic blood flow probe on the aorta, but ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/029A61B5/024A61B5/02
Inventor 刘常春王新沛刘澄玉朱其刚孙欣李远洋
Owner SHANDONG UNIV
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