Patent ID: 9737282
Date: 2017-08-22
CPC Classifications: A61B,G16H

Claim:
1. A method of determining a moment at which a status of an artery of interest under a changing pressure switches from open to closed and from closed to reopened, the method comprising: detecting a first Doppler ultrasound signal from the blood flow in the artery of interest using a first Doppler ultrasound transducer, which is adapted to be placed on skin overlying an artery of interest in a first limb which is wearing a cuff that is capable of being inflated or deflated to provide the changing pressure to the artery of interest; detecting a second Doppler ultrasound signal from the blood flow in a reference artery using a second Doppler ultrasound transducer, the second Doppler ultrasound transducer being adapted to be placed on skin overlying a reference artery in a second limb that is different from the first limb; deriving a third signal from a cross-covariance property between the first Doppler ultrasound signal and the second Doppler ultrasound signal, the third signal indicating a degree of synchronism between the first Doppler ultrasound signal and the second Doppler ultrasound signal; and outputting a fourth signal to indicate whether the artery of interest is closed or open based on whether the third signal satisfies a predefined condition.