Wearable Blood Pressure Monitoring With Posture-Corrected PPG
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Solution Overview
Problem
Existing blood pressure monitoring methods, including cuff-based and cuff-less technologies, suffer from discomfort and accuracy issues due to the lack of consideration of hemodynamic parameters and varying user postures, leading to unreliable measurements.
Innovation Solution
A wearable device utilizing a combination of sensors, including accelerometers and gyroscopes, processes physiological signals to determine hemodynamic parameters, correct for posture, and calculate blood pressure using pulse wave velocity and photoplethysmogram intensity ratios, providing accurate systolic and diastolic readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oscillometric measurements with strapping and pumping are used, then digitalized blood pressure monitoring is achieved, but user comfort deteriorates
Solution Approach 1:
The patent extracts and removes the cuff component from the blood pressure measurement system, transitioning from oscillometric cuff-based measurement to cuff-less PPG-based measurement. This extraction eliminates the discomfort of strapping and pumping while maintaining digitalized monitoring capabilities through photoplethysmographic sensors and signal processing algorithms
Solution Approach 2:
The patent replaces the mechanical oscillometric measurement system (requiring cuff inflation and deflation) with an optical-electronic PPG-based system. The mechanical pumping action is substituted with photodetector-based blood volume pulse detection and electronic signal processing, eliminating mechanical discomfort while achieving digitalized blood pressure monitoring
2Ease of operation
If cuff-less blood pressure measurement is used, then user comfort is improved, but measurement accuracy deteriorates due to not considering hemodynamic parameters and posture variations
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring multiple physiological parameters (PPG waveforms, pulse transit time, heart rate variability) and using these measurements to dynamically adjust and refine blood pressure calculations. The system incorporates posture detection feedback to compensate for gravitational effects on blood pressure, ensuring accurate readings regardless of user position
Solution Approach 2:
The patent utilizes changes in multiple physiological parameters (photoplethysmogram waveform characteristics, pulse transit time, heart rate variability, arterial stiffness indices) to infer blood pressure variations. By monitoring how these parameters change in response to blood pressure changes and posture variations, the system accurately determines blood pressure without requiring a cuff
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device ensures high accuracy in blood pressure monitoring with improved user comfort by considering multiple hemodynamic parameters and adjusting for posture, offering reliable systolic and diastolic pressure measurements.
Implementation Method 1
a plurality of sensors in communication with the processing unit and configured to sense an artery of a user and transmit at least one physiological signal corresponding to the artery to the processing unit, wherein the plurality of sensors comprise an accelerometer and a gyroscope
Implementation Method 2
the plurality of sensors comprise an accelerometer and a gyroscope
Implementation Method 3
obtain a photoplethysmogram intensity ratio (PIR)
Data Source
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AI summary
A wearable device (100) for measuring blood pressure comprises a housing (195) with through-holes formed thereon, a processing unit (120) disposed in the housing (195), a display (160) connected to the processing unit (120), a plurality of sensors (110) connected to the processing unit (120), the sensors (110) being configured to transmit at least one physiological signal to the processing unit (120) via the through-holes, and a time delay structure connected between one of the through-holes and one of the sensors (110) and configured to lengthen a path distance between the skin surface and the sensor (110), wherein the processing unit (120) is configured to determine a systolic arterial pressure and a diastolic arterial pressure by the at least one physiological signal and a Moens-Korteweg (MK) function, and to control the display (160) to display the systolic arterial pressure and the diastolic arterial pressure to be read by the user.