Method and device for measuring fluctuating pressure of fluid in elastic tube and compliance of elastic tube

Abstract

The invention discloses a method and a device for measuring fluctuating pressure of fluid in an elastic tube and compliance of the elastic tube. The method includes after searching for critical depth of the elastic tube, deciding direct-current pressure and alternating-current pressure both needed for decoupling control, enabling the to-be-measured elastic tube to be decoupled with surrounding tissue through displacement of a direct-current actuator and an alternating-current actuator to measure actual displacement changes and dynamic resistance of the to-be-measured elastic tube under the alternating-current pressure of the fluid, and calculating real-time continuous pressure and dynamic compliance. By the method and the device, real-time and continuous pressure changes of the fluid in the elastic tube and the dynamic resistance of the elastic tube can be measured accurately.

Description

technical field [0001] The present invention relates to a pressure measurement method and device when the fluid in the elastic tube fluctuates, especially a method and device for measuring the instantaneous continuous pressure of the fluctuating fluid in the elastic tube and the dynamic compliance of the elastic tube. Background technique [0002] According to the current human death factors, cardiovascular disease is one of the main death factors. Nowadays, the prevention, diagnosis and treatment of cardiovascular diseases have attracted much attention. The main cause of cardiovascular disease is arteriosclerosis. The current non-invasive (Noninvasive) arterial parameter detection technology mainly measures "arterial blood pressure (Arterial Blood Pressure)", "ankle-to-upper arm blood pressure ratio (ABI, Ankle Branch Index)", "pulse wave velocity (PWV, Pulse Wave) Velocity)” and “Arterial Compliance (Arterial Compliance)”. [0003] Arterial blood pressure is the measurem...

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Problems solved by technology

However, after the study, it was found that neither the tensometry method nor the This method cannot accurately measure the true blood pressure in the blood vessel because it cannot maintain the no-load state of the blood vessel under alternating blood pressure

In 2007, the inventors of the present invention developed an innovative blood pressure measurement technology called Tissue Control Method (TCM). The state of decoupling is to maintain the blood vessel in an unloaded state. Although the diameter change of the blood vessel can be obtained, the AC pressure signal of the measurement point is lost at the same time (the reference pressure of the controller is lost); in order to estimate the impedance of the blood vessel , using the self-adaptive control law, and using the peak-to-peak pulse pressure of the previous pulse wave as the reference pressure, although the Beat-based continuous intravascular blood pressure can be obtained, it is obviously inaccurate, such as Figure 11 shown; in addition, the obtained vascular arterial impedance is only an approximate average value of a pulse pressure cycle, such as Figure 12

In other words, although the tissue control method TCM causes the blood vessel to be under no load, the continuous blood pressure and dynamic compliance of the blood vessel cannot be measured immediately due to the loss of reference pressure

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