Multi-Channel Stethograph with Variable Gain Signal Conditioning
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Solution Overview
Problem
Existing stethoscope-based systems for recording heart and lung sounds are limited in precision and diagnostic capability, as they often suffer from noise interference and lack advanced monitoring features.
Innovation Solution
A multi-channel stethograph system with variable gain signal conditioning and Wi-Fi communication capabilities, utilizing multiple stethoscopes to generate audio data sets for heart, trachea, and lung sounds, which are then processed to extract features like respiratory rates and abnormal patterns, and analyzed using predefined disease criteria to diagnose conditions such as COPD, asthma, and congestive heart failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a commercially available pre-amplifier device with fixed gain is used, then the device complexity is reduced, but the measurement precision and diagnostic capability are limited
Solution Approach 1:
The patent implements variable gain control in the signal conditioning circuit, allowing the gain to be dynamically adjusted based on the input signal strength. This enables the system to adapt to different signal levels from multiple stethoscopes, improving measurement precision without requiring a completely complex custom amplifier design.
Solution Approach 2:
The signal conditioning circuit is designed to handle multiple input channels from different stethoscopes simultaneously, providing universal functionality. The circuit can condition signals from various sources (heart, lung, trachea stethoscopes) with a single unified design, reducing overall system complexity while maintaining high diagnostic capability.
2Adaptability or versatility
If multiple stethoscopes are used to capture comprehensive audio data, then the diagnostic capability is improved, but the device complexity and signal processing requirements increase
Solution Approach 1:
The patent combines multiple stethoscope inputs into a unified signal conditioning and processing system. All stethoscope channels are merged through a common variable gain amplifier and processed by a single microcontroller, reducing system complexity while maintaining the ability to capture comprehensive cardiac and respiratory data.
Solution Approach 2:
The system uses a universal signal conditioning circuit that can handle any stethoscope input channel identically. The same hardware and software processing pipeline is applied to all channels (heart, lung, trachea), providing diagnostic versatility without requiring separate processing paths for each stethoscope type.
3Measurement precision
If small electrical signals from stethoscopes are directly processed, then the device complexity is minimized, but the measurement precision is insufficient due to noise interference
Solution Approach 1:
The patent applies localized signal conditioning with variable gain amplification specifically at the input stage where weak signals from stethoscopes first enter the system. This targeted approach enhances small signals before they are affected by subsequent processing stages, improving detection accuracy without adding complexity throughout the entire signal path.
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 high-precision diagnostic and monitoring capabilities, enhancing the accuracy of heart and lung disease diagnosis by filtering noise and amplifying small electrical signals, enabling objective visual examination of audio waveforms for clinical decision-making.
Implementation Method 1
a signal conditioning circuit providing both variable gain and Wi-Fi communication
Implementation Method 2
Each of the 16 channels corresponds to data collected by fourteen stethoscopes... converting the sounds to an electrical signal
Data Source
AI summary
A multichannel stethographic device includes a plurality of individual stethoscopes that may be embedded in a foam pad or surface mounted on a thin flexible substrate. Additional stethoscopes for the heart and thorax may also be utilized. The system may include a signal conditioning circuit, wireless DAQ module, and software (algorithms). The systems may be configured to identify and diagnose various disease conditions such as pneumonia, chronic obstructive pulmonary disease (COPD), asthma, congestive heart failure (CHF), interstitial pulmonary fibrosis (IPF), and vocal cord dysfunction (VCD).