Blood Pressure Device Fluctuation Detection Control
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Solution Overview
Problem
Existing blood pressure measurement devices using the volume compensation method often result in excessive compression due to rapid changes in arterial volume signals, leading to abnormal readings and increased burden on the person being measured, as they respond late to rapid blood pressure fluctuations and lack sufficient prevention mechanisms.
Innovation Solution
A blood pressure information measurement device equipped with a fluctuation detection unit that identifies rapid arterial volume signal changes and adjusts the control amount of the servo control unit to prevent excessive compression, using a predetermined deviation threshold to converge the signal and set the control gain to an initial value to alleviate the burden on the measurement site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the volume compensation method is used to continuously obtain blood pressure values, then non-invasive blood pressure measurement is achieved, but excessive compression occurs when arterial volume signals rapidly change
Solution Approach 1:
The fluctuation detection unit detects rapid changes in arterial volume signals at the initial stage before excessive compression occurs. By identifying control deviations that exceed the predetermined threshold early in the process, the system can take preventive action by adjusting the control amount of the pressure adjustment unit, thereby avoiding the harmful effect of excessive compression while maintaining continuous blood pressure measurement capability
2Productivity
If feedback control is used to maintain constant arterial volume, then continuous blood pressure monitoring is enabled, but response becomes excessive when control deviation is large
Solution Approach 1:
The system continuously monitors arterial volume signals and compares them against the control target value to generate control deviation information. The fluctuation detection unit analyzes this feedback information to detect rapid fluctuations, and the adjustment processing unit modifies the control amount based on the detected fluctuations. This enhanced feedback mechanism prevents excessive response by dynamically adjusting control parameters when rapid changes are detected, ensuring reliable continuous blood pressure monitoring
Solution Approach 2:
The system changes the control parameter (control amount of pressure adjustment unit) dynamically based on the detected arterial volume signal fluctuations. When rapid fluctuations are detected, the control amount is adjusted to prevent excessive response. This parameter adaptation allows the system to maintain stable operation under varying conditions while avoiding abnormal blood pressure readings
3Device complexity
If a simple pressure limit is provided to prevent excessive compression, then device complexity is reduced, but the limit is insufficient for preventing more than necessary compression during rapid blood pressure changes
Solution Approach 1:
The fluctuation detection unit acts as an intermediary between the arterial volume signal detection and the pressure adjustment control. It processes the arterial volume signals to detect rapid fluctuations and generates control signals that adjust the pressure adjustment unit's control amount. This intermediary mechanism provides intelligent, adaptive protection against excessive compression without requiring complex additional hardware, maintaining device simplicity while enhancing reliability
Data Source
AI summary
A blood pressure information measurement device includes a servo control unit for performing a servo control of a pressure adjustment unit so that a value of an arterial volume signal matches a control target value and a fluctuation detection unit for detecting rapid fluctuation of the arterial volume signal at an initial stage during a period of the servo control. The fluctuation detection unit determines that the rapid fluctuation occurred when a control deviation representing a level of the arterial volume signal having the control target value as a reference becomes greater than or equal to a predetermined magnification of a reference deviation. The blood pressure information measurement device further includes an adjustment processing unit for adjusting a control amount of the pressure adjustment unit by the servo control unit so that an excessive response is not made when the rapid fluctuation is detected by the fluctuation detection unit.