Blood pressure measurement apparatus and methods of use thereof

A method, comprising:

• emitting, using an electroacoustic transducer in proximity to a blood vessel of a subject, a first set of soundwaves having a first range of frequencies;
• capturing, using an ultrasound sensor, a first set of ultrasound images showing a vibrational response of the blood vessel to the first set of soundwaves emitted by the electroacoustic transducer over the first range of frequencies;
• 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 a second set of soundwaves over a second range of frequencies narrower than the first range of frequencies;
• capturing, using the ultrasound sensor, a second set of ultrasound images showing a vibrational response of the blood vessel to the second set of soundwaves emitted by the electroacoustic transducer over the second range of frequencies;
• estimating, using at least the second set of ultrasound images, based on the vibrational response of the blood vessel to the second set of soundwaves, a resonant frequency of the blood vessel;
• determining, based on the first set of ultrasound images, the second set of ultrasound images, or an additional set of ultrasound images of the blood vessel captured by the ultrasound sensor, a wall thickness and a radius of the blood vessel;
• and
• calculating, based on the resonant frequency, the wall thickness, and the radius, a blood pressure of the subject.

A blood pressure measurement system, comprising:

• an electroacoustic transducer;
• an ultrasound sensor;
• a processor;
• and
• a non-transitory computer-readable medium storing instructions that when executed by the processor cause the blood pressure measurement system to perform operations comprising:
• emitting, using the electroacoustic transducer in proximity to a blood vessel of a subject, a first set of soundwaves having a first range of frequencies;
• capturing, using the ultrasound sensor, a first set of ultrasound images showing a vibrational response of the blood vessel to the first set of soundwaves emitted by the electroacoustic transducer over the first range of frequencies;
• 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 a second set of soundwaves over a second range of frequencies narrower than the first range of frequencies;
• capturing, using the ultrasound sensor, a second set of ultrasound images showing a vibrational response of the blood vessel to the second set of soundwaves emitted by the electroacoustic transducer over the second range of frequencies;
• estimating, using at least the second set of ultrasound images, based on a vibrational response of the blood vessel to the second set of soundwaves, a resonant frequency of the blood vessel;
• determining, based on the first set of ultrasound images, the second set of ultrasound images, or an additional set of ultrasound images of the blood vessel captured by the ultrasound sensor, a wall thickness and a radius of the blood vessel;
• and
• calculating, based on the resonant frequency, the wall thickness, and the radius, a blood pressure of the subject.