Cuffless Blood Pressure Estimation Using Touch Pen Force and Pulse Wave
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Solution Overview
Problem
Existing cuff-based blood pressure measurement methods are non-continuous and difficult to integrate into portable devices, while cuffless methods like PTT and PWA face challenges in accuracy and device compactness due to noise vulnerability and individual correction requirements.
Innovation Solution
An electronic device equipped with a communication interface, pulse wave measurer, and processor that receives force information from a touch pen to estimate blood pressure using contact pressure and pulse wave measurements, leveraging sensors like face recognition, cameras, and illuminance sensors as light receivers, and employing various communication technologies for data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressurized cuff-based method is used for blood pressure measurement, then measurement accuracy is improved, but device portability and compactness deteriorate due to the pressurizing pump configuration
Solution Approach 1:
The patent extracts and removes the pressurizing pump and cuff components from the blood pressure measurement system, replacing them with a cuffless optical sensing approach that uses only the electronic device's existing sensors and light sources, thereby achieving accurate measurement without the bulky mechanical components
Solution Approach 2:
The patent replaces the mechanical pressurizing system with an optical measurement system that uses light sources and sensors to detect pulse wave characteristics, eliminating the need for mechanical pumps and cuffs while maintaining measurement accuracy
2Volume of moving object
If PTT method is used for cuffless blood pressure measurement, then device compactness is improved, but measurement accuracy deteriorates due to noise vulnerability and individual correction requirements
Solution Approach 1:
The patent combines multiple measurement approaches (optical pulse wave detection, contact pressure sensing, and PTT analysis) into a unified system that leverages the strengths of each method while compensating for their individual weaknesses, thereby achieving accurate cuffless measurement without requiring individual correction
Solution Approach 2:
The patent incorporates feedback mechanisms where the system continuously monitors pulse wave characteristics and contact pressure, using this information to dynamically adjust and refine blood pressure estimates, reducing noise vulnerability and eliminating the need for individual correction procedures
3Volume of moving object
If PWA method is used for cuffless blood pressure measurement, then device compactness is improved, but measurement accuracy deteriorates due to noise vulnerability
Solution Approach 1:
The patent introduces contact pressure sensing as an intermediary measurement that provides additional information about the interaction between the device and the user's body, serving as a mediator that helps distinguish actual pulse wave signals from noise and improves the reliability of PWA-based blood pressure estimation
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
Enables accurate, cuffless blood pressure measurement in a portable format, reducing noise vulnerability and individual correction needs, with improved device compactness and user guidance for precise measurements.
Implementation Method 1
a light source configured to emit light to the object and a light receiver configured to receive light reflected or scattered from the object
Implementation Method 2
a light source configured to emit light to the object and a light receiver configured to receive light reflected or scattered from the object
Implementation Method 3
The communication interface may receive the force information from the touch pen using an electromagnetic induction method
Data Source
AI summary
According to one aspect of the present disclosure, an electronic device may include: a communication interface configured to receive, from a touch pen, force information about a force of the touch pen exerted onto an object when the object is in contact with the touch pen; a pulse wave measurer configured to measure a pulse wave of the object when the object is brought into contact with the electronic device by the force of the touch pen; and a processor configured to estimate a blood pressure of the object based on the force information and the pulse wave.