Blood Pressure Cuff Segmentation for Pulse Wave Accuracy
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Solution Overview
Problem
Existing blood pressure information measurement devices are cumbersome and complex, making them unsuitable for home use, and they struggle to accurately measure pulse wave velocity due to low signal-to-noise ratios, which affects the accuracy of arteriosclerosis index calculation.
Innovation Solution
A blood pressure information measurement device with a cuff containing a first fluid bag for blood pressure measurement and a second fluid bag for pulse wave measurement, connected via an inflation/deflation mechanism and pressure detection units, featuring a 2-port valve to enhance signal quality and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cuffs and sensors are fitted on different body sites to measure PWV, then measurement accuracy is improved, but device complexity and size increase
Solution Approach 1:
The invention divides the measurement function into two separate cuffs: one cuff for occluding the artery and another cuff for detecting the pulse wave. This segmentation allows each cuff to have a specialized, simplified structure while collectively achieving accurate PWV measurement through the coordinated operation of multiple functional components.
2Measurement precision
If multiple cuffs and sensors are fitted on different body sites to measure PWV, then measurement accuracy is improved, but portability for home use deteriorates
Solution Approach 1:
By segmenting the measurement system into specialized cuffs that can be fitted on accessible body parts (such as the arm), the invention enables accurate PWV measurement without requiring complex multi-site fitting on difficult-to-access areas, thereby improving portability and ease of home use.
3Device complexity
If a single cuff is used for both occlusion and pulse wave detection, then device simplicity is improved, but measurement accuracy deteriorates due to low signal-to-noise ratio
Solution Approach 1:
The invention separates the occlusion function and pulse wave detection function into different cuffs, allowing the detection cuff to be optimized specifically for signal acquisition with appropriate sensors and positioning, thereby achieving high signal-to-noise ratio and accurate pulse wave measurement.
Solution Approach 2:
The invention introduces a separate occlusion cuff as an intermediary component that applies compression to the artery without interfering with the pulse wave detection process. This intermediary occlusion mechanism enables clear isolation of the pulse wave signal from noise by controlling arterial compression independently from the detection process.
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 device achieves high accuracy in pulse wave measurement and arteriosclerosis index calculation by improving the signal-to-noise ratio and simplifying the device configuration, enabling miniaturization for home use while maintaining measurement precision.
Implementation Method 1
a first pressure detection unit which is provided on a portion of the piping connecting the first fluid bag and the opening/closing valve, and detects the internal pressure of the first fluid bag
Implementation Method 2
can be wrapped around a part of the body, and refers to a device that is used in the measurement of blood pressure information by inflating and deflating the fluid bag through injecting a fluid such as a gas or a liquid into the inner cavity
Data Source
AI summary
A blood pressure information measurement device includes a main body, including an inflation pump and an exhaust valve, and a cuff, including an air bladder for pulse wave measurement and an air bladder for blood pressure value measurement. The air bladder for pulse wave measurement and the air bladder for blood pressure value measurement are wrapped around a proximal side and a distal side of the upper arm, respectively. A first piping portion connects the air bladder for blood pressure value measurement to the inflation pump and the exhaust valve. A second piping portion branching from the first piping portion connects the air bladder for pulse wave measurement to the first piping portion. The second piping portion includes a 2-port valve that switches between connecting and disconnecting the air bladder for pulse wave measurement and the first piping portion, and a pressure sensor for measuring a pulse wave.