Wrist Blood Pressure Sensing Corrected for Circumference and Fat Thickness
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Solution Overview
Problem
Wrist-based blood pressure monitors face accuracy issues due to variations in wrist circumference and fat thickness, leading to inconsistent pulse wave signals and inaccurate blood pressure readings.
Innovation Solution
A wearable device that corrects blood pressure data using wrist circumference and fat thickness data, employing adjustable components and impedance detection to adapt to different wrist sizes and thicknesses, utilizing a mapping relationship for accurate blood pressure measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed width and length airbag is used in the wrist electronic sphygmomanometer, then the device structure is simple and easy to manufacture, but the blood pressure measurement accuracy deteriorates due to variations in wrist circumference and fat thickness
Solution Approach 1:
The patent applies the dynamics principle by making the airbag dimensions adjustable rather than fixed. The airbag width and length can be dynamically adjusted to match different wrist circumferences and fat thicknesses, allowing the device to adapt to various user anatomies while maintaining measurement accuracy without requiring multiple fixed airbag configurations
Solution Approach 2:
The patent implements parameter changes by varying the physical dimensions of the airbag (width and length parameters) to correspond to different wrist characteristics. This allows the same device structure to accommodate different users by adjusting airbag parameters, thereby improving measurement accuracy without increasing structural complexity
2Measurement precision
If the airbag is inflated to compensate for thick wrist fat and deep radial artery, then the pulse wave signal can be obtained, but the measured blood pressure becomes higher than actual systolic blood pressure due to the buffer function of elastic adipose tissue
Solution Approach 1:
The patent applies local quality by tailoring the airbag dimensions to match the specific local characteristics of each user's wrist. By adjusting the airbag width and length to correspond to the user's wrist circumference and fat thickness, the system ensures that the airbag provides appropriate pressure distribution locally, compensating for variations in adipose tissue without causing excessive pressure that would skew blood pressure readings
3Measurement precision
If different airbags are used for different wrist sizes and fat thicknesses, then measurement accuracy can be maintained, but the device complexity and cost increase due to multiple components
Solution Approach 1:
The patent implements universality by designing a single airbag system with adjustable dimensions that can serve all users regardless of wrist size or fat thickness. This multi-functional approach eliminates the need for multiple specialized airbags, maintaining measurement accuracy across diverse user populations while reducing device complexity and component variety
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
Enhances blood pressure measurement accuracy by accounting for wrist variations, improving compatibility and user experience without requiring different airbags for each user.
Implementation Method 1
detecting a plurality of electric potential differences formed at the wrist by the test currents on a plurality of frequencies; and determining the wrist fat thickness data based on the plurality of test currents and the plurality of electric potential differences
Data Source
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AI summary
Ablood pressure detection method and apparatus (60) applicable to the field of medical instruments are provided. The blood pressure detection apparatus (60) includes a wrist circumference detection component (03), a wrist fat thickness detection component (01), a blood pressure detection component (02), and a processor (04). The processor (04) is separately connected to the wrist circumference detection component (03), the wrist fat thickness detection component (01), and the blood pressure detection component (02). The wrist circumference detection component (03) obtains wrist circumference data of a user. The wrist fat thickness detection component (01) obtains wrist fat thickness data of the user. The blood pressure detection component (02) obtains blood pressure data of the user. The processor (04) corrects the blood pressure data based on the wrist circumference data and the wrist fat thickness data. This avoids an impact of a wrist circumference size and a wrist fat thickness on blood pressure measurement, and improves accuracy of blood pressure measurement. In addition, a same airbag (220) can be adapted to different people with different wrist circumferences and different wrist fat thicknesses, and target blood pressure can be accurately detected for different users without replacing different types of airbags (220). This improves compatibility of the blood pressure measurement apparatus (60) and enhances user wearing experience.