Blood Pressure Measurement Using Oscillation and Pulse Wave Signals
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Solution Overview
Problem
Pressurizing type blood pressure measurement apparatuses face challenges in accurately determining mean blood pressure due to reliance on oscillation amplitude alone, which can lead to incorrect measurements.
Innovation Solution
Incorporating a processor-controlled system that inflates the cuff pressure, monitors oscillation and pulse wave signal amplitudes, and determines mean blood pressure based on conditions where oscillation amplitude switches from increasing to decreasing and pulse wave signal amplitude decrease exceeds a predetermined value, utilizing both oscillation and pulse wave signals for accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If only oscillation amplitude is monitored to determine mean blood pressure, then measurement time is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The patent combines oscillation amplitude monitoring with pulse wave signal amplitude monitoring to determine mean blood pressure. The controller identifies mean blood pressure when oscillation amplitude reaches maximum AND pulse wave signal amplitude shows a specific decrease pattern, merging two measurement approaches to achieve both speed and accuracy.
Solution Approach 2:
The system uses feedback from both oscillation signals and pulse wave signals to continuously monitor and accurately determine mean blood pressure. The controller adjusts identification based on the decreasing amount of pulse wave signal amplitude, creating a feedback mechanism that ensures measurement accuracy while maintaining efficiency.
2Measurement precision
If cuff pressure is inflated to high levels for accurate measurement, then measurement accuracy is improved, but subject discomfort and measurement time increase
Solution Approach 1:
The patent applies partial action by inflating the cuff only to the level needed to reach maximum oscillation amplitude, rather than inflating to levels exceeding systolic blood pressure as in traditional methods. This partial inflation reduces subject discomfort and measurement time while maintaining accuracy through the dual-signal identification method.
3Productivity
If pressurizing type measurement is used to reduce measurement time, then productivity is improved, but measurement reliability deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring both oscillation amplitude and pulse wave signal amplitude during pressurization. The controller uses the feedback from pulse wave signal decrease patterns to reliably identify mean blood pressure, ensuring measurement reliability is maintained even in the pressurizing type method.
Solution Approach 2:
The patent replaces the traditional mechanical oscillation-only detection system with an enhanced system that incorporates optical or electrical pulse wave detection. This substitution allows for more reliable and diverse measurement parameters while maintaining the speed advantages of the pressurizing type method.
Data Source
AI summary
A blood pressure measurement apparatus includes a pressure controller that controls an internal pressure of a cuff, an oscillation acquiring section that acquires an oscillation corresponding to a pressure vibration, a pulse wave signal acquiring section that acquires a pulse wave signal of the subject from a probe, a processor, and a memory that stores instructions executable by the processor. In the apparatus, when the instructions are executed by the processor, the apparatus causes the pressure controller to inflate the internal pressure, determines whether a first condition is satisfied or not, determines whether a second condition is satisfied or not, and if the first condition and the second condition are satisfied, determines a mean blood pressure of the subject based on the internal pressure.