Prototype design and realization of a portable heart sounds detection system
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1College of Instrumentation and Electrical Engineering, Jilin University, Changchun, China. lsy@jlu.edu.cn.
Abstract:
Timely and accurate heart sound detection is essential for early screening of cardiovascular diseases. Traditional stethoscope-based methods are constrained by time, location, and human factors. Considering the reasonable cost, portability, and accuracy of heart sound detection, this study designs and implements a hardware prototype for a portable home-use heart sound detection device based on a polyvinylidene fluoride (PVDF) sensor and an ESP32 microcontroller (weighing 115 g with a power consumption of 0.42W). The device is capable of heart sound signal collection, conditioning, and wireless transmission. The device’s effectiveness and stability were validated through waveform comparison experiments (demonstrating high consistency with the HKY-06C device), heart rate calculation (with an error of ± 2 bpm), Radio Frequency (RF) performance testing, and noise level assessment. This device can effectively reduce medical costs, improve diagnostic efficiency, and enable efficient screening and early warning of cardiovascular health for populations in medically underserved areas by providing high-precision data support for remote diagnostics or the application of intelligent recognition models.
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01:15Heart Sounds
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V)...
01:30Equipments Used To Measure Blood Pressure
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
01:25Assessment of the Cardiovascular System IV: Auscultation
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.