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Blood volume measurement method and blood volume measurement device

A measurement method and blood volume technology, applied in blood flow measurement, diagnostic recording/measurement, blood vessel assessment, etc., can solve problems such as difficulty in measuring blood pressure, impossibility of calibration, imposition on patients, etc.

Active Publication Date: 2017-08-25
NIHON KOHDEN CORP
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Problems solved by technology

[0009] However, with the blood volume measurement method described in Patent Document 1, the blood pressure must be measured at least twice or more when determining the coefficient α inherent to the patient, which leads to an increase in measurement time and may impose unnecessary stress on the patient.
Furthermore, calibration of alpha and beta cannot be achieved when there is no difference between two or more blood pressure measurements
Therefore, in order to make the blood pressure values ​​different from each other, it is necessary to measure the blood pressure while putting the patient under load; therefore, it is not easy to measure the blood pressure value itself

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  • Blood volume measurement method and blood volume measurement device
  • Blood volume measurement method and blood volume measurement device
  • Blood volume measurement method and blood volume measurement device

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Embodiment Construction

[0032] Exemplary embodiments of the blood volume measuring method and measuring device of the present invention will be described below with reference to the accompanying drawings.

[0033] First, the principle of measuring cardiac output (cardiac output: CO) will be explained below.

[0034] According to the Windkessel model as an index for diagnosing blood vessels, the flow rate determined by subtracting the blood volume (Qs) flowing out to the periphery during systole from the blood volume flowing into the aorta during systole, that is, the stroke volume (SV) ( SV–Qs), which can be expressed in terms of aortic compliance (C) and pulse pressure [PP: difference between systolic (highest blood pressure) and diastolic (lowest blood pressure)] as follows:

[0035] SV–Qs=C*PP (Eq.1)

[0036] The volume of blood outflow to the periphery (Qd) during diastole becomes equivalent to SV–Qs. Flow Qs is determined by dividing arterial systolic pressure (V) by vascular resistance (R), a...

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Abstract

Method for measuring a blood volume is provided. At least two types of respiratory variation data; for instance, data pertinent to respiratory variations in stroke volume (SVV) data, data pertinent to respiratory variations in an amplitude of a pulse wave (PAV), a pulse wave transit time (PWTT) in a respiratory cycle, and a heart rate (HR) in a predetermined time, are measured, and patient's inherent coefficients ±, ², and K are calculated, whereby a cardiac output can be determined by an equation CO = K (± * PWTT + ²) * HR.

Description

technical field [0001] The invention relates to a blood volume measurement method and a blood volume measurement device for measuring cardiac output. Background technique [0002] Monitoring of circulatory dynamics in patients in operating theatres, intensive care units, emergency treatment units or dialysis treatment units in healthcare centers must be performed continuously with minimal interruption. Such monitoring of changes in the circulatory dynamics of a patient has hitherto been mainly practiced by direct monitoring of blood pressure. [0003] However, the living body usually controls the cardiac output and vascular resistance, so that the blood pressure of the nerve center is maintained within a certain range. Therefore, direct monitoring of blood pressure is not sufficient in order to determine changes in circulatory dynamics in patients at an early stage. In addition, when a change in blood pressure is observed, the cause of the change must be determined. For t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/029
CPCA61B5/0205A61B5/02108A61B5/02125A61B5/0215A61B5/022A61B5/029A61B5/0816
Inventor 須郷義広酒井智之寺尾真美
Owner NIHON KOHDEN CORP
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