Biological Information Measuring Instrument with Stable Electrocardiographic Waveform Measurement
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Solution Overview
Problem
Conventional biological information measurement devices that simultaneously measure blood pressure and electrocardiographic waveforms experience significant noise due to rapid changes in the contact state of the electrode caused by cuff pressure changes during blood pressure measurement.
Innovation Solution
A biological information measurement device with a blood pressure measurement unit and an electrocardiographic measurement unit, where the cuff pressure is held constant or gradually changed during electrocardiographic waveform measurement by controlling the pump and exhaust valve to stabilize the contact state of the electrodes, and abnormality detection mechanisms to stop measurements when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cuff pressure is rapidly changed to complete blood pressure measurement efficiently, then the productivity is improved, but the electrocardiographic waveform measurement precision deteriorates due to noise from electrode contact state changes
Solution Approach 1:
The system dynamically adjusts the cuff pressure control strategy based on the measurement phase. During blood pressure measurement, rapid pressure changes are permitted for efficiency. During electrocardiographic waveform measurement, the system transitions to gradual or constant pressure maintenance to ensure measurement precision, thus adapting the pressure control characteristics to different operational requirements
Solution Approach 2:
The system implements periodic measurement cycles where blood pressure measurement and electrocardiographic waveform measurement are alternated or sequenced. During electrocardiographic measurement periods, the cuff pressure is maintained constant or changed gradually, while during blood pressure measurement periods, rapid pressure changes are applied. This periodic switching allows both measurement types to perform optimally at different times
2Measurement precision
If the cuff pressure is held constant to stabilize electrode contact during electrocardiographic measurement, then the measurement precision is improved, but the productivity decreases due to extended measurement time
Solution Approach 1:
The measurement process is segmented into distinct phases: blood pressure measurement phase and electrocardiographic waveform measurement phase. Each phase has its own optimized cuff pressure control strategy. The blood pressure measurement phase uses rapid pressure changes for efficiency, while the electrocardiographic phase uses constant or gradual pressure for precision, allowing both requirements to be satisfied in their respective segments
Solution Approach 2:
The system performs preliminary blood pressure measurement before electrocardiographic waveform measurement. This preliminary action allows the cuff to be inflated to the required pressure level before transitioning to the electrocardiographic measurement phase, where the pressure is then maintained constant or changed gradually. This preliminary preparation enables efficient blood pressure measurement without compromising subsequent electrocardiographic measurement quality
Data Source
AI summary
A biological information measurement device includes a blood pressure measurement unit including a blood pressure measurement control unit configured to control a cuff configured to compress a target measurement site of a subject, a pump configured to supply gas into the cuff, an exhaust valve configured to adjust exhaust of the gas from the cuff, and a pressure detection unit configured to detect a cuff pressure that is a pressure in the cuff, the blood pressure measurement unit being configured to measure a blood pressure of the subject, and an electrocardiographic measurement unit including an electrode provided on a target measurement site side of the cuff and configured to measure an electrocardiographic waveform by processing an electrical signal obtained through a plurality of electrodes that can come into contact with a skin of the subject.