Wrist Blood Pressure Correction via Motion Detection
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Solution Overview
Problem
Blood pressure measurement devices attached to the wrist can experience detection errors due to height differences between the wrist and heart, leading to inaccurate blood pressure readings, as existing technologies do not adequately correct for these position changes.
Innovation Solution
A blood pressure correction information generating device that detects wrist position changes using a motion detecting section and calculates correction information by comparing pre- and post-change blood pressure data, allowing for accurate correction of measurement errors caused by wrist position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a motion detecting section is used to detect wrist position changes, then measurement errors due to position changes can be corrected, but detection errors may occur in the height difference between wrist and heart
Solution Approach 1:
The system uses feedback by comparing blood pressure values before and after position changes to generate correction information. The blood pressure correction information generating section compares first blood pressure information (before position change) with second blood pressure information (after position change) to create correction data that compensates for detection errors in wrist position measurement.
Solution Approach 2:
Blood pressure values serve as an intermediary to indirectly measure wrist position changes. Instead of relying solely on motion detection sensors that may have detection errors, the system uses blood pressure changes as a mediator to infer position changes and generate correction information, thereby improving overall measurement reliability.
2Measurement precision
If high-accuracy positional detection sensors are used to detect wrist position, then measurement errors can be corrected, but production costs increase
Solution Approach 1:
The system uses itself to detect position changes by monitoring its own blood pressure measurements. The blood pressure measurement device leverages the physiological response (blood pressure change) caused by position changes to detect the position change, eliminating the need for separate high-precision position sensors and reducing manufacturing costs.
Solution Approach 2:
The system changes the measurement parameter from direct position measurement to blood pressure measurement. By monitoring blood pressure parameter changes that occur when wrist position changes, the system achieves position detection functionality using existing blood pressure measurement capabilities rather than requiring additional high-precision position sensors.
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 effectively corrects measurement errors in blood pressure readings by generating correction information based on detected wrist position changes, ensuring accurate blood pressure measurement without the need for high-accuracy positional detection sensors, thereby reducing production costs and enhancing measurement reliability.
Implementation Method 1
detects a change time period when a position in a gravity direction of a wrist of a person to be measured is changed
Implementation Method 2
detects a pulse wave from the wrist of the person to be measured; information of a pressure pulse wave detected by the pressure sensor
Implementation Method 3
an error in blood pressure information due to the hydrostatic pressure cannot be correctly corrected
Data Source
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AI summary
A blood pressure correction information generating device that, in a wrist-wear blood pressure measurement device, generates information with which a measurement error in blood pressure information that is caused by a position change of the wrist can be correctly corrected, a blood pressure measurement device including the blood pressure correction information generating device, a blood pressure correction information generating method, and a blood pressure correction information generating program are provided. A blood pressure measurement device 100 includes: a blood pressure information calculating section 11 which calculates blood pressure information every pulse based on a pulse wave detected by a pulse wave detecting section 10; and an acceleration sensor 12 which outputs information according to motion of the wrist of the person to be measured, detects a change time period when the wrist position is largely changed, based on motion information output from the acceleration sensor 12, and generates blood pressure correction information for correcting blood pressure information which is calculated by the blood pressure information calculating section 11 after the change time period, based on blood pressure information which is calculated by the blood pressure information calculating section 11 before and after the detected change time period.