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Table 4 Summarized results from the market review

From: The electronic stethoscope

References Product Name Feature highlights and characteristics Sensor type Algorithm
[135] 3 M Littmann Range Bell mode (20–200 Hz)
Diaphragm mode (100–500 Hz)
Extended mode(20–1,000 Hz)
Amplify sounds up to 24 times
Piezoelectric sensor Ambient noise reduction using ANC
Friction noise dampening
No built-in signal classifier
[136] Thinklabs One Digital Filter for adjusting sound in bell/diaphragm mode, and acoustic mode
Amplify sounds up to 100 times
Patented capacitive transducer Ambient noise reduction, specific HSs extraction (e.g., valve clicks) and LS removal by filtering
No built-in signal classifier
[137] Welch-Allyn Elite Electronic Stethoscope Bell mode (heart): 20–420 Hz
Diaphragm mode (lungs) 350–1,900 Hz
Integrated ECG
Piezoelectric sensor Ambient noise reduction with novel sensor design
No built-in signal classifier
[138] Cardionics E-scope II Selectable frequency response for HS and LS.
Amplify sounds up to 30 times
Complement system enabling ECG capability
Microphone NM
[139] Rijuven CardioSleeve Stethoscope add-on device
Allows regular stethoscope to have simultaneous acquisition and quantitative measurements of ECG and cardiac acoustical data
NA, stethoscope add-on device Normal and abnormal HSs identification and quantification
Murmur detection
[140] Ekoscope Bell mode
Diaphragm mode
Diaphragm plus mode
Eight built-in EKG electrodes
[16] JABES Life Sound System Diaphragm mode: 200–500 Hz
Bell mode: 20–200 Hz
Wide mode: 20–1,000 Hz
Amplify body sounds up to 20 times
NM Heart beat calculation
Ambient noise and hand tremor cancellation
No built-in signal classifier
[141] ViScope Bell mode
Diaphragm mode
Body sound amplification up to 30 times
Real-time visual display of multiple waveforms
NM Patented visualization algorithms
  1. NA not available, NM not mentioned.