Electronic Sphygmomanometer Position Detection and Control
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Solution Overview
Problem
Conventional wrist-type electronic sphygmomanometers often fail to start measurement correctly due to users' difficulty in positioning the measurement site properly, especially for those with physical limitations or lack of experience, leading to discomfort and inability to perform hourly measurements.
Innovation Solution
An electronic sphygmomanometer equipped with an angle sensor, position determining unit, notification unit, time determining unit, and measurement control unit that guides and notifies users on proper positioning, automatically starting measurements when the site is within the correct range and maintaining usability even if out of range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement is started only when the position of the measurement site falls within the proper range, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The device performs preliminary position detection using the angle sensor before initiating measurement. The position determining unit checks whether the measurement site is within the proper range, and the notification unit provides guidance to the user. This preliminary check ensures that measurement precision is maintained while the system automatically adapts to user capabilities by allowing measurement to proceed once proper positioning is achieved, without requiring manual intervention from users with physical limitations.
Solution Approach 2:
The notification unit provides real-time feedback to the user about whether the measurement site is properly positioned. This feedback mechanism guides users with physical limitations or lack of experience in achieving the correct position, thereby maintaining measurement precision while improving ease of operation. The feedback loop continues until proper positioning is achieved, at which point measurement automatically starts.
2Measurement precision
If the device requires proper positioning before measurement, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The angle sensor and position determining unit perform position verification as a preliminary action before measurement starts. By automatically detecting and verifying proper positioning in advance, the system eliminates the need for repeated manual adjustments during the measurement process, thereby reducing overall time loss while ensuring measurement precision.
Solution Approach 2:
The device performs self-verification of proper positioning through the angle sensor and position determining unit without requiring user intervention. The notification unit automatically guides the user if positioning is incorrect, and measurement automatically starts once proper position is achieved. This self-service mechanism reduces the time users would otherwise spend manually adjusting their position while maintaining measurement accuracy.
3Ease of operation
If angle sensor detection is added to determine proper positioning, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The angle sensor serves multiple functions: it detects the angle of the cuff with respect to a reference direction, determines whether the measurement site is in the proper range, and provides data for the notification unit to guide users. This multi-functionality reduces the need for separate components for each function, thereby improving ease of operation while minimizing the increase in device complexity.
Solution Approach 2:
The position determining unit combines the angle sensor detection with the measurement control logic into a single integrated function. The notification unit merges guidance information with the measurement initiation process. This merging of functions reduces the overall complexity compared to having separate independent systems for position detection, user guidance, and measurement control.
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
Improves usability by ensuring accurate blood pressure measurements can be taken regardless of user experience or physical limitations, reducing discomfort and enabling continuous monitoring.
Implementation Method 1
an angle sensor that detects an angle of the cuff with respect to a predetermined reference direction
Implementation Method 2
a pressure sensor that detects a cuff pressure signal indicating a pressure in the cuff
Data Source
AI summary
An electronic sphygmomanometer determines whether a position of a measurement site falls within a proper range, and notifies whether the position of the measurement site falls within the proper range. When determination is made that a time in which the position of the measurement site falls within the proper range is not less than a predetermined time (for example, 2 seconds), measurement of a blood pressure is automatically started. When determination is made that a time in which the position of the measurement site is out of the proper range is not less than a predetermined time (for example, 5 seconds), the measurement of the blood pressure is started. Further, whether the position of the measurement site falls within the proper range is notified while correlated with the measurement result.