Breathing Flow Monitoring via Thoracic Abdominal Pressure Sensors
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Solution Overview
Problem
Existing methods for pulmonary ventilation function examination, such as pulmometry and respiratory inductive plethysmography, face challenges including high cost, high power consumption, unstable circuits, and limitations in long-term monitoring due to the need for invasive masks or inaccurate measurements.
Innovation Solution
A method and device that acquire pressure values from thoracic and abdominal pressure monitoring points, perform data analysis to determine displacement variations, and apply nonlinear fitting to calculate thoracic and abdominal volume variations, thereby determining breathing parameters like total pulmonary ventilation volume, thoracic and abdominal contribution ratios, and phase differences, using a pressure detection system with piezoresistive sensors and a main control chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If respiratory inductive plethysmography is used to measure cross-sectional area of chest or abdomen, then non-invasive breathing measurement is achieved, but measurement accuracy is poor and power consumption is high
Solution Approach 1:
The patent replaces the electromagnetic induction principle with a pressure sensor-based mechanical measurement system. Pressure sensors mounted on the chest and abdomen directly measure pressure changes during breathing, which are then converted to volume changes through mathematical modeling. This substitution eliminates the need for complex electromagnetic circuits and resonance structures, significantly reducing power consumption while improving measurement accuracy.
Solution Approach 2:
The patent changes the measurement parameter from cross-sectional area (respiratory inductive plethysmography) to pressure changes (pressure sensors). By measuring pressure changes at multiple points on the chest and abdomen and using these parameters in a mathematical model, the system accurately calculates breathing volume without requiring invasive masks or complex electromagnetic equipment.
2Measurement precision
If pulmometry with breathing mask is used for flow examination, then pulmonary disease exclusion is capable, but subject activity is restricted and respiratory airway resistance increases
Solution Approach 1:
The patent extracts the essential measurement function from the invasive breathing mask and relocates it to external pressure sensors on the chest and abdomen. This extraction eliminates the need for the subject to wear a mask while maintaining the ability to measure breathing parameters and detect pulmonary diseases. The pressure sensors are simply attached to the body surface, allowing free movement and normal respiratory patterns.
Solution Approach 2:
The patent introduces pressure sensors as an intermediary between the respiratory system and the measurement device. Instead of directly measuring flow through a mask, the system measures pressure changes at the chest and abdomen, which serve as intermediaries that reflect breathing parameters. This intermediary approach allows non-invasive measurement while maintaining measurement accuracy for pulmonary disease detection.
3Duration of action of stationary object
If respiratory inductive plethysmography is used for long-term monitoring, then non-invasive measurement is achieved, but circuit stability is poor and cost is high
Solution Approach 1:
The patent replaces the complex electromagnetic induction circuitry with a simple pressure sensor system. Pressure sensors are robust, low-power devices that do not require unstable resonance circuits or complex electromagnetic shielding. This substitution provides stable, reliable measurements suitable for long-term monitoring while reducing cost and improving circuit stability.
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
This approach provides accurate, low-cost, and low-power monitoring of breathing flow, avoiding the limitations of traditional methods by improving measurement accuracy and reducing power consumption, while allowing for long-term monitoring without invasive equipment.
Implementation Method 1
a plurality of piezoresistive thin-film pressure sensor units disposed on an inner side of the elastic vest and configured to detect pressure values of pressure monitoring points of the patient
Data Source
AI summary
The present disclosure provides a method and device for monitoring a breathing flow based on thoracic and abdominal movements. The method includes: acquiring pressure values of pressure monitoring points of a patient, where the pressure monitoring points include a chest pressure monitoring point and an abdomen pressure monitoring point; performing data analysis based on the pressure values to determine displacement variations of the pressure monitoring points relative to initial spatial coordinates; performing nonlinear fitting based on the displacement variations to determine a thoracic volume variation and an abdominal volume variation; and determining breathing parameters based on the thoracic volume variation and the abdominal volume variation, where the breathing parameters include a total pulmonary ventilation volume, a thoracic breathing contribution ratio, an abdominal breathing contribution ratio, and a thoracic and abdominal phase difference. The present disclosure allows for breathing flow monitoring with a low cost and high accuracy.