File No.: QR-HC21-C-C09
Xiamen Linktop Technology Co., Ltd.
Page 8 of 17
use an iPhone to download the "NexStetho" application from the APP Store.
(2) Please make sure that the Bluetooth of the mobile phone is open, and the
stethoscope is turned on.
(3) Launch the "NexStetho" application, click "Add Device", the application will search for
the Bluetooth of the stethoscope until it finds a device with the Bluetooth name
"HC-21", select and connect, the application will automatically bind the stethoscope.
(4) Use the application to select the auscultation mode and confirm whether to use the
heart sound auscultation or lung sound auscultation mode.
The heart sound auscultation mode is suitable for low-frequency sounds in
auscultation, such as the first heart sound, the second heart sound, the rumbling
diastolic murmur of mitral valve stenosis, etc. When using it, touch the body surface
to be checked lightly, but care should be taken to avoid body parts and Additional
sound caused by skin friction.
The lung sound auscultation mode is suitable for high-pitched sounds in auscultation,
such as murmurs of aortic regurgitation, breathing sounds, bowel sounds, etc. When
using it, touch the body surface to be inspected tightly.
(5) Select the auscultation site and confirm whether to auscultate the lung or the heart.
(6) Putting the stethoscope membrane (Figure 4) to the patient’s body at specific spots
indicated by the doctor, and holding it at each spot, click the start button in the
application to record until the auscultation time is sufficient, click the stop button to
end the recording.
Figure 4
(7) It is recommended to record sound at all the spots indicated by the doctor.
(8) If you hear that the quality of sound recorded at some spots is poor, it is necessary to
repeat recording at those spots.
2. Patient auscultation mode using the application to connect with Electronic
Stethoscope via 3.5mm audio cable