Beat-by-Beat Blood Pressure Analysis With Wrist Motion Attribution
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Solution Overview
Problem
Existing blood pressure measuring devices struggle to distinguish between variations caused by changes in wrist-heart height difference and abnormal cardiovascular events, leading to inaccurate diagnosis.
Innovation Solution
A blood pressure analyzing apparatus that determines whether blood pressure variations are due to wrist movement or other factors by comparing blood pressure information from consecutive beats and wrist movement data, using a blood pressure variation determiner and a blood pressure variation cause determiner to associate the cause with the recorded data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blood pressure is measured continuously for every beat, then small blood pressure variations can be detected, but it becomes impossible to distinguish between variations caused by wrist movement and those caused by cardiovascular events
Solution Approach 1:
The patent segments the blood pressure measurement system into multiple independent components: a pulse wave detection unit that measures blood pressure for every beat, and a wrist movement detection unit that separately monitors wrist position. By dividing the monitoring function into these separate segments, the system can independently analyze each data stream and determine whether blood pressure variations correlate with wrist movements, thereby resolving the contradiction between detection precision and cause determination reliability.
2Productivity
If blood pressure is measured at long intervals (several hours), then measurement frequency is reduced, but large blood pressure variations occurring between measurements cannot be detected
Solution Approach 1:
The patent implements continuous useful action by measuring pulse waves for every cardiac beat without interruption. This continuous measurement approach ensures that no blood pressure variations are missed, capturing both small gradual changes and large sudden variations. The system maintains uninterrupted monitoring while using automated analysis to process the continuous data stream efficiently.
3Reliability
If wrist movement detection is added to distinguish movement-induced variations from cardiovascular events, then cause determination accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by using a single wrist-mounted device to perform multiple functions: detecting pulse waves for blood pressure measurement, detecting wrist movements for cause determination, and automatically analyzing the correlation between these two data streams. This universal approach consolidates multiple functions into one device, improving cause determination accuracy while minimizing the increase in overall system complexity.
Data Source
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AI summary
Provided are a blood pressure analyzing apparatus, a blood pressure measuring apparatus, a blood pressure analyzing method and a blood pressure analyzing program, which can accurately determine a cause of a blood pressure variation useful for diagnosis. The blood pressure analyzing apparatus 2 determines whether, of blood pressure information corresponding to a plurality of beats which are calculated for every beat based on pulse waves detected from a wrist of a subject and which are recorded into a recording medium 14 that records the blood pressure information corresponding to the plurality of beats and wrist move information detected by an acceleration sensor 12 during a detection period of the pulse waves serving as a calculation source of the blood pressure information corresponding to the plurality of beats, first blood pressure information corresponding to an arbitrary beat varies a threshold TH1 or more from second blood pressure information corresponding to a previous beat to the arbitrary beat or not. When a result of the determination is YES, the blood pressure analyzing apparatus 2 determines whether the blood pressure variation is caused by the move of the wrist or by another reason than the move of the wrist, based on detection information of the acceleration sensor which is detected in a detection period of a pulse wave serving as a calculation source of the first blood pressure information. The blood pressure analyzing apparatus 2 records, into a recording medium 23, a result of the determination and the first blood pressure information in association with each other.