Blood Pressure Pulse Wave Segmentation for Respiratory Artifact Removal
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Solution Overview
Problem
Invasive blood pressure measurements are affected by respiratory variation and body motion, leading to inaccurate readings, and existing methods require additional sensors and averaging processes that are insufficient in suppressing these influences.
Innovation Solution
A biological information measuring apparatus and method that produces unit pulse waves based on heart beats and statistically analyzes these waves to extract only necessary pulses, eliminating artifacts like respiratory variation without additional sensors, using an electrocardiogram and blood pressure pulse wave measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an averaging process is performed to suppress respiratory variation, then blood pressure measurement stability is improved, but measurement precision deteriorates because sufficient effect cannot be obtained when large influence is exerted by respiratory variation
Solution Approach 1:
The patent segments the blood pressure waveform into multiple discrete waveform data points corresponding to individual respiratory cycles. By dividing the continuous waveform into segmented portions based on respiratory rhythm, the system can selectively process only the portions unaffected by respiratory variation, thereby improving measurement precision while maintaining stability.
Solution Approach 2:
The patent extracts and removes the respiratory variation component from the blood pressure waveform by identifying and separating the waveform segments that correspond to respiratory cycles. This extraction allows the system to eliminate the harmful respiratory influence while preserving the true blood pressure signal, resolving the contradiction between stability and precision.
2Measurement precision
If a respiratory waveform sensor is added to calculate blood pressure in synchronization with respiratory waveform, then blood pressure measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent enables the blood pressure measurement system to self-correct for respiratory variation by using the blood pressure waveform itself to identify respiratory cycles. The system processes the blood pressure signal to extract respiratory information and uses this to segment and filter the waveform, eliminating the need for separate respiratory sensors and reducing device complexity while maintaining accuracy.
Solution Approach 2:
The patent makes the blood pressure waveform serve multiple functions: it not only provides blood pressure information but also contains embedded respiratory cycle information that can be extracted to guide the segmentation and processing of the waveform. This multi-functionality eliminates the need for additional dedicated respiratory sensors.
3Productivity
If invasive catheter placement is used to continuously measure blood pressure waveform, then monitoring capability is improved, but measurement precision deteriorates due to respiratory variation and body motion affecting the low-pressure system
Solution Approach 1:
The patent segments the continuous blood pressure waveform into discrete units corresponding to individual respiratory cycles. By organizing the continuous signal into segmented portions based on respiratory rhythm, the system can identify and exclude segments affected by respiratory variation and body motion, thereby improving measurement precision while preserving continuous monitoring capability.
Solution Approach 2:
The patent dynamically adjusts the processing method based on the detected respiratory cycles and body motion patterns. The system continuously monitors and adapts its segmentation and filtering operations to the changing physiological conditions, maintaining measurement precision across varying operational conditions while preserving continuous monitoring.
Data Source
AI summary
A biological information measuring apparatus includes a blood pressure pulse wave measuring unit configured to measure a blood pressure pulse wave of a subject, a unit pulse wave producing unit configured to produce unit pulse waves of a certain unit from the blood pressure pulse wave based on an analysis of heart beats of the subject, a unit pulse wave extracting unit configured to analyze the unit pulse waves produced by the unit pulse wave producing unit and to extract only necessary unit pulse waves in accordance with the analysis, and an output unit configured to perform an output based on the unit pulse waves extracted by the unit pulse wave extracting unit.