Blood Pressure Measurement Device with Biaxial Rotating Sensor
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Solution Overview
Problem
Existing blood pressure measurement devices require repetitive processes to establish an optimum pressing force, which can be cumbersome for users and may lead to inaccurate measurements due to variations in artery position during continuous pressure adjustments.
Innovation Solution
A blood pressure measurement device with a pressure pulse wave detection unit that includes an air bag, biaxial rotating mechanism, and multiple pressure sensors, allowing for continuous blood pressure measurement by adjusting the pressing force and rotating the sensor unit to ensure accurate alignment with the radial artery, thereby minimizing user discomfort and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressing force is varied continuously to determine the optimum pressing force, then the measurement precision is improved, but the measurement time increases and the artery position may vary
Solution Approach 1:
The pressing force is pre-adjusted to an optimum value before measurement begins. The air bag is inflated to apply a predetermined pressing force that closes the radial artery, eliminating the need for continuous pressing force variation during measurement. This preliminary setup enables immediate accurate measurement without time-consuming adjustments.
Solution Approach 2:
The pressing force is made dynamically adjustable through the air bag system, allowing it to be quickly set to the optimum value and maintained steadily. This dynamic control ensures the artery remains closed throughout the measurement process, maintaining measurement precision without requiring continuous variation.
2Measurement precision
If the pressing force is varied continuously to determine the optimum pressing force, then the measurement precision is improved, but the ease of operation deteriorates due to repetitive processes
Solution Approach 1:
The device automatically performs the pressing force adjustment and artery closure preparation before the user initiates measurement. The air bag system is pre-configured to apply the correct pressing force, eliminating the need for users to perform repetitive adjustment processes and making the device easy to operate while maintaining high precision.
Solution Approach 2:
The device autonomously manages the pressing force adjustment and maintains optimal conditions for measurement without requiring user intervention. The control system automatically controls the air bag to apply and maintain the predetermined pressing force, making the complex precision-adjustment process transparent to the user.
3Measurement precision
If the pressing force is increased to close the radial artery, then the measurement precision is improved, but the user discomfort increases
Solution Approach 1:
The pressing force parameter is precisely controlled to match the exact value needed to close the radial artery without exceeding it. The air bag system allows for fine-tuned pressure application, ensuring the minimum necessary force is applied to achieve artery closure and accurate measurement while minimizing user discomfort through precise parameter optimization.
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 quick and accurate blood pressure measurement by optimizing the pressing force and alignment with the radial artery, reducing user burden and enhancing measurement precision.
Implementation Method 1
controlling a pressing unit (2) that presses a pressing surface (6b) toward a radial artery (T) by increasing an internal pressure
Implementation Method 2
detecting pressure pulse waves that are generated from the radial artery (T) and transmitted to the skin
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A blood pressure measurement device is equipped with a pressing surface 6b which is formed with element arrays of plural pressure sensors 6a and 7a that are arranged in one direction, an air bag 2 for pressing the pressing surface 6b against a living body part including a radius artery T running in a state that the one direction crosses a direction in which the radius artery T runs, an air bag drive unit 11 for controlling a pressing force of the air bag 2, a rotational drive unit 10 for driving the pressing surface 6b rotationally about at least one of axes X and Y that are perpendicular to a pressing direction of the air bag 2, and a control unit 12 which performs a rotation control on the pressing surface 6b on the basis of pressure pulse waves that were detected by the pressure sensors 6a and 7a in a process that the pressing force was increased and calculates blood pressure values in the radius artery T on the basis of pressure pulse waves that were detected by the pressure sensors 6a and 7a after the rotation control in a process that the pressing force was decreased.