Patent ID: 11950887
Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A blood pressure measurement device, comprising:
an electroacoustic transducer configured to emit multiple soundwaves having multiple frequencies, the soundwaves configured to cause a blood vessel of a subject to vibrate;
an ultrasound transducer configured to capture multiple ultrasound images of the blood vessel, the multiple ultrasound images comprising a first set of images showing a vibrational response of the blood vessel to a first set of soundwaves emitted by the electroacoustic transducer over a first range of frequencies, and a second set of images showing a vibrational response of the blood vessel to a second set of soundwaves emitted by the electroacoustic transducer over a second range of frequencies narrower than the first range of frequencies; and
a processing device configured to:
determine, based on the multiple ultrasound images, a wall thickness, a radius, and a resonant frequency of the blood vessel; and
calculate, based on the wall thickness, the radius, and the resonant frequency, a blood pressure of the subject,

wherein determining the resonant frequency of the blood vessel comprises:
adjusting, based on the vibrational response of the blood vessel to the first set of soundwaves emitted by the electroacoustic transducer over the first range of frequencies, a frequency of soundwaves output by the electroacoustic transducer to emit the second set of soundwaves over the second range of frequencies;
determining, from the multiple ultrasound images, based on a vibrational response of the blood vessel to the soundwaves, a frequency of the multiple frequencies that maximizes a vibration of the blood vessel; and
selecting the frequency as the resonant frequency.