Patent ID: 9339196
Filing Date: 2016-05-17
CPC Classification: A61B

Claim Text:
1. A non-invasive method of measuring a real-time continuous pressure of fluid in an elastic tube and a dynamic compliance of the elastic tube, wherein elastic surrounding tissues are wrapped outside the elastic tube, and wherein a fluctuating fluid flows in the elastic tube, the fluid having a fluid pressure which can be divided into a DC part P b and an AC part ΔP b , the method comprising: using an oscillometric method, pressing a detection head by a DC-driven actuator on the surface of the surrounding tissues to locate an initial critical depth holding at the initial critical depth to determine a decoupled ratio K for partial or full tracking of the AC part of fluid pressure ΔP actuating a DC-driven actuator to maintain a DC part of a sensor's pressure setting an AC-driven actuator, separate from the DC-driven actuator, in an idling (hold) stage to obtain three previous reference pressures Δ{circumflex over (P)} using a constant AC open loop gain K using the constant AC open loop gain K sending an AC control gain K computing the AC part of the fluid pressure ΔP adding the DC part of the fluid pressure extracting a series of equivalent mechanical properties including mass M