Sphygmomanometer Sensing Cuff for Accurate Arterial Pressure Detection
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Solution Overview
Problem
Conventional sphygmomanometers with narrow cuffs experience press loss and measurement errors due to cuff inflation, and existing solutions with sensor assemblies are not accurately positioned to detect pulse waves, leading to inaccurate blood pressure readings.
Innovation Solution
A sphygmomanometer design featuring a band-shaped cuff structure with a sensing cuff and back plate, where the sensing cuff is positioned along the inner circumferential surface of the pressure cuff to accurately detect pressure across the artery passing portion, allowing for accurate blood pressure measurement even with cuff displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the width direction dimension of the cuff is reduced to enhance appearance and wearing comfort, then the cuff greatly inflates in the thickness direction causing press loss and measurement error
Solution Approach 1:
The cuff is divided into two separate functional components: a pressure cuff for compression and a sensor assembly for detection. This segmentation allows the pressure cuff to be narrow (improving comfort) while the sensor assembly independently detects arterial pressure without being affected by cuff inflation geometry
Solution Approach 2:
The sensor assembly acts as an intermediary between the pressure cuff and the measurement system. It directly detects pressure at the arterial site through the cuff material, serving as a mediator that eliminates the need for the entire cuff to maintain uniform pressure distribution
2Measurement precision
If the sensor assembly is locally disposed to correspond only to the radial artery, then the sensor assembly is not capable of acquiring a pulse wave signal appropriately when the cuff is displaced
Solution Approach 1:
The pressure detection function and pulse wave detection function are merged into a single sensor assembly. This integration allows the sensor to simultaneously detect both static pressure and dynamic pulse wave signals from the same location, ensuring accurate signal acquisition even with cuff displacement
Solution Approach 2:
The sensor assembly is designed with localized high-sensitivity detection elements positioned at the arterial site. This local quality enhancement ensures that even a small sensor area can accurately detect pulse wave signals regardless of broader cuff position variations
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 design ensures accurate blood pressure measurement by directly detecting pressure applied to the artery, reducing measurement errors and maintaining accuracy despite cuff displacement, while allowing for a smaller cuff width to enhance comfort and appearance.
Implementation Method 1
a pressure sensor mounted on the main body to detect a pressure in an air bag
Implementation Method 2
air for pressurization is supplied from the pump mounted on the main body to the air bag to press the artery of the wrist
Data Source
AI summary
A sphygmomanometer includes a main body mounted with a pump, a belt, and a cuff structure. The cuff structure having a band shape is disposed facing an inner circumferential surface of the belt in a freely separable manner from the inner circumferential surface of the belt. One end of the cuff structure is attached to the main body. The cuff structure includes a bag-shaped pressure cuff that extends along a circumferential direction of a measurement target site, a bag-shaped sensing cuff that extends in the circumferential direction across an artery passing portion of the measurement target site, and a back plate that is inserted between the pressure cuff and the sensing cuff. A blood pressure is calculated based on a pressure of a pressure transmission fluid contained in the sensing cuff.