Portable digital esophageal stethoscope system

Kang

et al. 2021

Sensors

In surgeries where general anesthesia is required, the auscultation of heart and lung sounds is essential to provide information on the patient’s cardiorespiratory system. Heart and lung sounds can be recorded using an esophageal stethoscope; however, there is huge background noise when this device is used in an operating room. In this study, a digital esophageal stethoscope system was designed. A 3D-printed case filled with Polydimethylsiloxane material was designed to hold two electret-type microphones. One of the microphones was placed inside the printed case to collect the heart and lung sound signals coming out from the patient through the esophageal catheter, the other was mounted on the surface of the case to collect the operating room sounds. A developed adaptive noise canceling algorithm was implemented to remove the operating room noise corrupted with the main heart and lung sound signals and the output signal was displayed on software application developed especially for this study. Using the designed case, the noise level of the signal was reduced to some extent, and by adding the adaptive filter, further noise reduction was achieved. The designed system is lightweight and can provide noise-free heart and lung sound signals.

Section: Introductionmentioning

confidence: 99%

Heart and Lung Sound Measurement Using an Esophageal Stethoscope with Adaptive Noise Cancellation

Kang

et al. 2021

Sensors

The Transactions of The Korean Institute of Electrical Engineer

“…Recently, an electronic esophageal stethoscope (EES) [1] has been developed for the purpose of real-time monitoring these information visually. This system uses only a microphone as the sound sensor.…”

mentioning

confidence: 99%

An Improved Electronic Esophageal Stethoscope using Sound and Pressure Sensors

Min¹,

Shin²,

Jeon³

et al. 2013

-Esophageal stethoscope is used for monitoring the heart sounds and breath sounds of patients during surgery under a general anesthesia. Recently, an electronic esophageal stethoscope (EES) [1] has been developed for the purpose of real-time monitoring these information visually. This system uses only a microphone as the sound sensor. A drawback of the EES system is that it may be difficult to distinguish the first sound (  ) and the second sound (  ) of heart, because their periods are irregular depending on patients. In this paper, we propose an improved EES system in which the infrasound is measured by adding a pressure sensor as well as a sound sensor. We investigate some correlations between the infrasound and characteristics of the heart sound. The proposed system has been tested on 15 patients. The results show that the new system is capable of detecting the first sound more reliably and easily determining the heart rate and breathing period.

“…Concerning the market, some systems already exist but have lots of limitation as the diagnostic and the telemedicine phases (Bai and Lu, 2005;Pawar and Chaskar, 2014;Wang et al, 2009;Shin et al, 2011). Added to that, referring to eBay.com (2016, their prices are high.…”

Section: Introductionmentioning

confidence: 99%

A low-cost computerised electronic stethoscope with pre-diagnosis and easy transmission features

Daou

Sadek

Karim

et al. 2017

IJBET

Digital stethoscopes already exist in the market. However, their prices are not always affordable by many medical doctors and patients and most of them do not embed the telemedicine and/or the pre-diagnostic features. Thus, the proposed system presents a novel approach to record, save, process, analyse, diagnose and send data coming from the stethoscope to the healthcare professional that is not present near the patient. This low-cost system aims also to give a pre-diagnosis regarding his heart and/or his chest behaviours. The prediagnostic and the data processing are executed using LabView software. Some of the system features are to save the records of the patient and compare them over time, transmit the saved signal to the doctor's email or uploading them on the web, show the placement of the stethoscope sensors depending on the required reading, etc. Good results were obtained when comparing the exact values (using the conventional stethoscope) and the transmitted ones (file generated when recording the heart/lung signals). Added to that, the basic diagnoses given by the software were not far from the real ones. 60 persons were tested by three medical doctors and signals generated from the systems were almost the same as the exact signals. Thus, the proposed system could be bought by any patient or healthcare professional for its accurate results, easy handling, portability and telemedicine feature.Keywords: digital stethoscope; LabView; analogue and digital filters; healthcare professionals; diagnosis phase; telemedicine.Reference to this paper should be made as follows: Abi Zeid Daou, R., Sadek, K., Bou Karim, M. and Makhlouf, P. (2017) 'A low-cost computerised electronic stethoscope with pre-diagnosis and easy transmission features', Int.