Blood Pressure Measurement Device Adaptive Cuff Pressure Control
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Solution Overview
Problem
Existing blood pressure measurement devices face challenges in accurately measuring blood pressure information due to varying transfer rates of cuff pressure to the artery, influenced by physical characteristics such as muscle, fat, and artery depth, leading to insufficient compression or prolonged measurement times.
Innovation Solution
A blood pressure information measurement device employing two fluid bladders with a coupling unit, pressure sensors, and a computation unit that adjusts and measures internal pressures to determine an avascularized state and calculate arteriosclerosis indices, ensuring optimal cuff pressure application regardless of subject characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant pressing force is applied to the cuff, then the device structure is simple, but the measurement precision deteriorates due to varying pressure transfer rates
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant pressing force to a dynamic adaptive pressing force. The control unit adjusts the cuff pressure in real-time based on feedback from the pressure sensor, creating a dynamic system that adapts to varying pressure transfer rates caused by different physical characteristics of subjects.
Solution Approach 2:
The patent implements feedback by using a pressure sensor to monitor the actual pressure applied to the measurement site and feeding this information back to the control unit. The control unit then adjusts the pressing force based on this feedback to achieve the target pressing force, ensuring accurate blood pressure measurement despite variations in pressure transfer rates.
2Measurement precision
If higher cuff pressure is applied to ensure adequate compression, then measurement precision improves, but the subject burden increases and measurement time is prolonged
Solution Approach 1:
The feedback mechanism allows the system to apply only the necessary pressing force required to achieve adequate compression for accurate pulse wave measurement. By continuously monitoring pressure and adjusting accordingly, the system avoids applying excessive pressure that would increase subject burden and prolong measurement time.
Solution Approach 2:
The system dynamically changes the pressure parameter based on real-time conditions. Instead of applying a fixed high pressure, the control unit adjusts the pressure level to match the actual pressure transfer rate, ensuring adequate compression while minimizing subject burden and measurement time.
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 accurately measures blood pressure information by ensuring consistent and optimal cuff pressure application, reducing measurement time and subject burden, and enhancing precision in detecting characteristic points of pulse waves.
Implementation Method 1
a pressure sensor that measures the internal pressures of the first fluid bladder and the second fluid bladder
Implementation Method 2
compress a measurement site of a subject over the skin using an air bladder called a cuff, thereby compressing an artery at the measurement site
Data Source
AI summary
A measurement device pressurizes two cuffs in a state in which the cuffs are attached to the distal side and the proximal side of the measurement device, respectively, calculates an AI value or the like based on a pulse wave detected from a change in cuff pressure on the distal side while pressurizing the two cuffs, and determines that avascularization on the distal side has been completed if the AI value or the like has converged. Once it is determined that avascularization has been completed, the cuff pressure on the distal side is fixed, and a pulse wave is detected from a change in cuff pressure on the proximal side in a state in which the distal side is avascularized.