Colpitts Oscillator Wearable RIP Sensor for Respiratory Analysis
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Solution Overview
Problem
Existing wearable respiratory inductance plethysmography (RIP) systems face challenges in obtaining accurate breathing measurements due to noise and artifacts from movement, leading to suboptimal data quality and reliability.
Innovation Solution
A wearable system utilizing a Colpitts oscillator with an optimal frequency band of 1 MHz to 15 MHz, embedded in a garment with conductive wire loops around the body, converts analog plethysmographic signals into digital data for precise respiratory rate, tidal volume, and minute ventilation analysis, while minimizing movement artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RIP sensors are used in wearable garments, then the system can monitor respiratory activity, but noise and artifacts from movement degrade signal quality and measurement accuracy
Solution Approach 1:
The patent replaces conventional mechanical/resistive RIP sensors with an inductive sensing system using a conductive loop and oscillator. The inductive measurement method is less sensitive to movement artifacts and contact pressure variations, thereby improving signal quality and breathing measurement accuracy while maintaining wearable functionality
Solution Approach 2:
The patent optimizes the oscillation frequency parameter to 4.3 MHz, which provides optimal signal-to-noise ratio for respiratory measurements. This frequency optimization minimizes the impact of movement artifacts and enhances the detection of subtle respiratory-induced impedance changes, thereby improving measurement precision
2Measurement precision
If the oscillator frequency is set to optimal range (1-15 MHz), then signal quality improves, but power consumption increases
Solution Approach 1:
The patent selects an optimal oscillation frequency of 4.3 MHz within the 1-15 MHz range, which balances signal quality and power consumption. This specific frequency provides sufficient signal-to-noise ratio for accurate respiratory measurements while minimizing the power requirements of the oscillator circuit, enabling wearable operation
Solution Approach 2:
The system employs periodic sampling of the oscillation frequency at optimized intervals rather than continuous monitoring. This periodic measurement approach maintains high signal quality for breathing detection while significantly reducing the average power consumption of the oscillator and associated electronics
3Measurement precision
If conductive wire loops are embedded in garments, then respiratory inductance can be measured, but the garment structure becomes more complex
Solution Approach 1:
The conductive loop serves multiple functions: it acts as both the sensing element for respiratory measurement and an integral part of the garment structure. The loop can be seamlessly integrated into existing garment fabrics without requiring separate sensor modules, thereby minimizing additional structural complexity while enabling precise plethysmographic signal 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 system provides reliable and accurate breathing metrics with improved signal quality, capable of detecting various physiological and physical conditions, including respiratory issues and heart activities, without hindering the wearer's movement.
Implementation Method 1
inductive plethysmography is a plethysmographic measurement based on determination of an inductance or a mutual inductance
Implementation Method 2
the electronic device includes a Colpitts oscillator connected to each wire loop; wherein the Colpitts oscillator has an optimal frequency band from 1 MHz to 15 MHz for extracting the plethysmographic signal
Data Source
AI summary
It is described a system and a method for respiratory activity analysis comprising the use of Respiratory Inductance Plethysmography (RIP). In particular, a wearable system for extracting physiological parameters of a person by measuring at least one plethysmographic signal is disclosed. The system comprises: a wearable garment fitting a body part of the person; at least one wire supported by or embedded into the garment, each wire forming a loop around the body part when the person wears the garment for measuring a plethysmographic signal; and an electronic device supported by or fixed on the garment and including a Colpitts oscillator connected to each wire loop, wherein the Colpitts oscillator has an optimal frequency band from 1 MHz to 15 MHz for extracting the plethysmographic signal measured by each wire, the electronic device converting analog information measured by the Colpitts oscillator into digital analyzable information.