A Bionic MEMS Electronic Stethoscope With Double-Sided Diaphragm Packaging

Abstract

In this paper, an electronic stethoscope is designed based on a bionic Micro-Electro-Mechanical System (MEMS) sound-sensitive sensor. Inspired by the strong sound reflection effect of the water-air interface, a double-sided diaphragm MEMS electronic stethoscope (DMES) encapsulated by a novel double-sided diaphragm packaging is proposed. The double-sided diaphragm packaging's superiority is verified by comparing a single diaphragm MEMS electronic stethoscope (SMES) with DMES. The frequency of the clinical heart sound signal is mostly in the range of 20-600 Hz. Finite simulation results show that for the same incident sound source, the sound pressure level inside double-sided diaphragm packaging is 4dB higher than that of single diaphragm packaging in this frequency band. Furthermore, the actual auscultation test results show that the signal-to-noise ratio (SNR) of DMES reaches 41.3dB, which is 2.2dB higher than SMES. Besides, comparing the heart sound signals collected by DMES and a commercial electronic stethoscope (Model 3200, 3M Littmann, USA), the high consistency of the two signals' characteristic parameters in the time domain and frequency domain proves the feasibility of DMES. Finally, DMES has the advantages of low cost, and its SNR is 10.2db higher than that of the 3M electronic stethoscope. All these show that DMES has a broad prospect in the popularization of basic medical treatment.

Optimum Design and Test of a Novel Bionic Electronic Stethoscope based on the Cruciform Microcantilever with Leaf Microelectromechanical Systems Structure

“…Cilium & |Sphere [25,33] 23.0 132.0 15.1 Liquid-solid Cilium [33] 14.5 124.0 18.6 Liquid-solid Globule/Lollipop [33,34] 34.0 657.0 25.7 Liquid-solid Bat [33,35] 19.0 541.0 29.1 Liquid-solid frequency band below 20 Hz is relatively affluent. By contrast, the energy spectrum of other frequency bands is minimal, indicating that the heart band signal is effectively picked up.…”

Current Status and Development Tendency of Wearable Cardiac Health Monitoring

“…The presence of two diaphragms and the intervening air path results in excessive ambient noise from the microphone and inefficient sound energy transmission [76] . In 2021, Duan et al [77] proposed a lollipop-shaped bionic pickup cavity, simulating the operating principle of the neuromast organ of a fish, which is highly sensitive in the low-frequency band.…”

Effects of Resonator Shape on Nonlinear Resonant Frequencies of a Microresonant Pressure Sensor

“…where E is the modulus of elasticity; I is the second moment; F is the inner axial force of the resonator; ρ is the density of the resonator material; S is the cross-sectional area of the resonator; C a is the gas damping factor: C a � ηb 3 /(d 0 − y) 3 (η is the dynamic viscosity of the gas).…”

“…Microelectromechanical systems (MEMS), with the advantages of high integration, high precision, low power consumption, and easy mass production, are widely used in intelligent manufacturing, robotics, and other elds [1][2][3][4]. MEMS include microsensors, microactuators, and processing circuits [5].…”