Sphygmomanometer Cuff Rotation for Constant Elbow Detection Distance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sphygmomanometers face challenges in maintaining a consistent measurement posture across different physiques due to varying inclination angles of the cuff unit, leading to inconsistent distances between the cuff entrance and elbow detection mechanism, which can result in inaccurate blood pressure measurements.
Innovation Solution
A sphygmomanometer design featuring a rotation mechanism between the cuff unit and base, allowing the cuff unit to rotate about a rotation axis, with an elbow detection mechanism positioned above this axis to maintain a constant distance between the cuff entrance and elbow detection mechanism regardless of the inclination angle, ensuring accurate measurements for subjects of varying physique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cuff unit is fixed at a predetermined inclination angle relative to the base, then the structure is simple, but the distance between the cuff entrance and elbow detection mechanism varies for subjects of different physiques, leading to measurement errors
Solution Approach 1:
The cuff unit is made rotatable relative to the base through a rotation mechanism, allowing the inclination angle to be dynamically adjusted. This enables the device to adapt to different subject physiques while maintaining a constant distance between the cuff entrance and elbow detection mechanism, thereby resolving the contradiction between structural simplicity and measurement accuracy.
2Device complexity
If the elbow detection mechanism is positioned below the rotation axis, then the structure is simplified, but the distance between the cuff entrance and elbow detection mechanism changes with inclination angle adjustments
Solution Approach 1:
The elbow detection mechanism is repositioned from below the rotation axis to above the rotation axis. This dimensional change in positioning ensures that the detection mechanism remains at a constant distance from the cuff entrance regardless of the cuff unit's inclination angle, thereby maintaining measurement reliability while accommodating structural variations.
3Adaptability or versatility
If the cuff unit inclination angle is adjusted for different physiques, then adaptability to various subjects is improved, but the distance to the elbow detection mechanism becomes inconsistent
Solution Approach 1:
The patent replaces the traditional mechanical positioning system with a rotation mechanism that pivots the cuff unit about a fixed axis. This mechanical substitution allows the cuff inclination to be adjusted for different physiques while the elbow detection mechanism, positioned above the rotation axis, maintains a constant distance from the cuff entrance through the rotational geometry, thus preserving measurement precision.
Data Source
AI summary
In a sphygmomanometer, an elbow detection mechanism that detects the placement of a measurement subject's elbow is provided in a portion of a cuff unit above a rotation axis. Because the elbow detection mechanism is provided in the portion of the cuff unit above the rotation axis on the biological member (upper arm) exit side, the distance L between the elbow detection mechanism and the biological member (upper arm) exit of the cuff unit can be kept constant even when the cuff unit rotates. This enables providing a sphygmomanometer that has a mechanism for changing the inclination angle of the cuff unit relative to a base and includes a mechanism for achieving a constant distance between the elbow detection mechanism and the entrance of the cuff unit regardless of the inclination angle of the cuff unit.