Biosignal Measurement Module Height Compensation
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Solution Overview
Problem
Conventional blood pressure measurement devices are not portable and cannot continuously measure blood pressure due to time-consuming air filling and bleeding processes, and are prone to errors caused by height differences between the wrist and the heart.
Innovation Solution
A biosignal measurement module comprising a biosignal measurement unit, a pose detection unit, and a processing unit that measures electrocardiogram and pulse signals, detects the module's position, calculates a height variation parameter, and compensates the pulse transit time to obtain a blood pressure signal, thereby addressing errors from height differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional blood pressure measurement device uses a wrist-wearing bladder detection unit, then the device can measure blood pressure, but it cannot continuously measure blood pressure and is time consuming due to air filling and bleeding processes
Solution Approach 1:
The patent replaces the mechanical inflatable bladder system with a optical detection system that uses light transmission through the finger to detect pulse signals. This substitution eliminates the need for air filling and bleeding operations, enabling continuous blood pressure measurement without time loss.
Solution Approach 2:
The patent implements continuous blood pressure measurement by continuously monitoring pulse transit time through optical detection. The system maintains continuous measurement capability without interruption, eliminating the discontinuous measurement pattern of conventional inflatable devices.
2Measurement precision
If a conventional blood pressure measurement device measures blood pressure at the wrist, then the device can obtain blood pressure data, but measuring errors occur due to height differences between the detected wrist and the heart
Solution Approach 1:
The patent introduces pulse transit time as an intermediary parameter to bridge the relationship between heart and wrist measurements. By measuring the time for the pulse to travel from the heart to the wrist and using this to calculate blood pressure, the system compensates for the height difference between measurement points, eliminating the measurement error caused by wrist positioning.
3Ease of operation
If a portable biosignal measurement module is designed, then the device becomes portable and can be worn continuously, but the device complexity increases due to multiple sensors and processing units
Solution Approach 1:
The patent merges multiple functions including ECG signal acquisition, pulse signal detection, pose detection, and blood pressure calculation into a single integrated module. This consolidation achieves portability and continuous wear capability while managing device complexity through functional integration rather than separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous, portable blood pressure monitoring by compensating for height variations, reducing measurement errors and allowing for precise blood pressure calculation without the need for frequent initial parameter setting.
Implementation Method 1
measuring an electrocardiogram signal and a pulse signal of a subject
Implementation Method 2
measuring an electrocardiogram signal and a pulse signal of a subject
Implementation Method 3
detecting a position of the biosignal measurement module
Implementation Method 4
calculating a current pulse transit time according to the electrocardiogram signal and the pulse signal
Implementation Method 5
obtaining a blood pressure signal according to the compensated pulse transit time
Data Source
AI summary
A biosignal measurement module is provided and includes a biosignal measurement unit, a pose detection unit, and a processing unit. The biosignal measurement unit measures an electrocardiogram signal and a pulse signal of a subject. The pose detection unit detects a position of the biosignal measurement module and outputs position signals. The processing unit receives the electrocardiogram signal, the pulse signal, and the position signals. The processing unit generates a height variation parameter, which indicates the height difference between the position of the biosignal measurement module and a reference position, according to the position signals. The processing unit calculates a current pulse transit time according to the electrocardiogram signal and the pulse signal and compensates for the current pulse transit time according to the height variation parameter to obtain a compensated pulse transit time. The processing unit obtains a blood pressure signal according to the compensated pulse transit time.