Blood Pressure Cuff Deflation Control for High-Resolution Measurement
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Solution Overview
Problem
Existing blood pressure measurement methods, such as the auscultatory and oscillometric methods, are time-consuming and may not provide high fidelity measurements, especially in determining systolic and diastolic pressures.
Innovation Solution
A method and system that estimates systolic and diastolic blood pressures during cuff inflation using waveform oscillations, defines specific ranges of interest, and adjusts deflation rates to enhance measurement precision and speed, utilizing a cuff, pressure sensor, and audio sensor to capture Korotkoff sounds during deflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional auscultatory or oscillometric methods are used for blood pressure measurement, then measurement fidelity is maintained, but measurement time is excessive
Solution Approach 1:
The system performs preliminary estimation of systolic and diastolic blood pressures during the cuff inflation phase by analyzing waveform oscillations. This preliminary action identifies the approximate pressure ranges where systolic and diastolic events will occur, allowing the system to prepare for targeted measurement during deflation without requiring full-spectrum monitoring, thus reducing overall measurement time while maintaining accuracy.
Solution Approach 2:
The measurement process is segmented into distinct phases: an initial inflation phase for estimation, followed by targeted deflation phases for precise measurement. The deflation process is further segmented into different rate phases - a first deflation rate for rapid traversal and a second slower deflation rate for precise measurement at critical pressure points. This segmentation allows the system to optimize between speed and precision at different stages.
2Measurement precision
If a single deflation rate is used throughout the measurement process, then device complexity is reduced, but measurement precision is compromised
Solution Approach 1:
The system dynamically adjusts the deflation rate based on the current pressure level and measurement requirements. During the initial phase, a first deflation rate is used for efficiency. When the pressure reaches the estimated systolic range (first range of interest), the system transitions to a second, slower deflation rate for precise systolic measurement. After passing through systolic measurement, it returns to the first deflation rate until reaching the diastolic range (second range of interest), then switches to the second rate again for precise diastolic measurement. This dynamic adjustment optimizes both precision and complexity.
Solution Approach 2:
The system changes the deflation rate parameter at specific pressure thresholds. The controller monitors cuff pressure and automatically switches between deflation rates based on whether the current pressure is within the first range of interest (systolic range) or the second range of interest (diastolic range). This parameter change approach allows precise measurement at critical points while maintaining overall process efficiency.
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
Reduces the time required for blood pressure measurements while maintaining high fidelity by using waveform oscillations and controlled deflation rates to accurately determine systolic and diastolic pressures.
Implementation Method 1
estimates of the systolic and diastolic blood pressures are based on waveform oscillations of pressure detected from the cuff
Implementation Method 2
utilizing a cuff, pressure sensor, and audio sensor to capture Korotkoff sounds during deflation
Data Source
AI summary
A method of measuring blood pressure includes estimating systolic and diastolic blood pressures while inflating a cuff. The estimates of the systolic and diastolic blood pressures are based on waveform oscillations of pressure detected from the cuff. First and second ranges of interest are defined based on the estimated systolic and diastolic blood pressures, respectively. The method includes deflating the cuff at a first deflation rate until the first range of interest is reached and measuring the systolic blood pressure while deflating the cuff at a second deflation rate through the first range of interest. The second deflation rate is less than the first deflation rate. The method includes deflating the cuff at the first deflation rate until the second range of interest is reached, and measuring the diastolic blood pressure while deflating the cuff at the second deflation rate through the second range of interest.