Flexible Cardiopulmonary Sensor With Frequency Band Filtering
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Solution Overview
Problem
Conventional non-contact cardiopulmonary measurement devices face challenges in comfort and accuracy due to interference between heart and lung signals, and discomfort caused by wearable components.
Innovation Solution
A card-type measuring device with a sensor and control module, featuring a coil on a substrate that transmits and receives electromagnetic signals, and a filter unit to distinguish and separate heart and lung signals, reducing interference and enhancing comfort with a flexible substrate design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a coil or other components of a magnetoelectric electric effect sensing device are used, then cardiopulmonary state can be measured, but the device causes discomfort or difficulty in movement in the subject's daily life
Solution Approach 1:
The patent employs a flexible substrate as the base for the sensing device, allowing it to conform to the subject's body contours without restricting movement. This flexible film structure eliminates the discomfort associated with rigid coil components while maintaining the magnetoelectric sensing capability for accurate cardiopulmonary measurement.
2Measurement precision
If the heart or lungs of the subject are measured using conventional magnetoelectric electric effect sensing methods, then cardiopulmonary state can be detected, but the measured signals are prone to interaction and interference with each other
Solution Approach 1:
The patent implements signal segmentation through frequency band separation. The sensing signals are divided into different frequency bands using filter units, allowing distinct separation of heart signals (typically higher frequency) from lung signals (typically lower frequency). This segmentation eliminates mutual interference and enables independent analysis of each organ's physiological state.
Solution Approach 2:
The patent applies local quality by assigning different frequency band characteristics to different physiological sources. The filter units are configured with specific frequency response characteristics tailored to isolate signals from particular organs, optimizing the detection quality for each local physiological source while minimizing cross-interference.
3Measurement precision
If optical plethysmography (PPG) is used for non-contact measurement, then cardiopulmonary state can be measured, but the measurement is easily affected by external factors such as the subject's clothing and/or skin
Solution Approach 1:
The patent replaces the optical measurement mechanism with a magnetoelectric sensing mechanism. Instead of using light penetration and reflection through skin and clothing (optical PPG), the device uses electromagnetic induction to detect physiological movements. This substitution eliminates the sensitivity to optical interference from clothing and skin pigmentation, providing more robust non-contact measurement.
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
The device provides stable, non-invasive cardiopulmonary monitoring by effectively filtering and processing signals to distinguish heart and lung features, improving measurement accuracy and comfort during wear.
Implementation Method 1
the coil is configured to transmit a first electromagnetic signal toward a to-be-measured part of a subject and receive at least a second electromagnetic signal induced by the first electromagnetic signal and generated at the to-be-measured part
Data Source
AI summary
A measuring device for measuring cardiopulmonary state comprises a sensor and a control module. The sensor comprises a substrate and a coil arranged on the substrate. The coil is configured to transmit a first electromagnetic signal towards the part to be measured, and receive at least a second electromagnetic signal generated by the induction of the first electromagnetic signal to generate an induction signal. The control module is coupled to the coil. The control module includes a signal generating unit configured to provide an AC signal to the coil, a filtering unit coupled to the coil, and a processing unit. The filtering unit has at least a first filtering frequency band and a second filtering frequency band. The induction signal is divided into at least a first part and a second part aft″r pa'sing through the filtering unit. The processing unit calculates at least one feature signals of the state of the subject's heart or lungs according to at least one of the first part and the second part.