In the video below I show you my first tests with this health device. In the first part, we see a test where I get six Korotkoff sounds. In the second part I did a close up, so you can see the data on the LCD screen.

To increase the amount of Korotkoff sounds detected I did two things:

• The air release valve must be recalibrated, so I gave it more time so that the device had time to detect more Korotkoff sounds (Reference: second point of section 7); and

Recalibration

• Foam rubber must be added to the air pump to reduce device vibrations, because these vibrations induce noise in other devices.

I've getting ten Korotkoff sounds in this test, and we can see them in the figure below:

Ten Korotkoff sounds

Korotkoff sounds:

• 139 mmHg
• 130 mmHg
• 127 mmHg
• 126 mmHg
• 116 mmHg
• 111 mmHg
• 109 mmHg
• 106 mmHg
• 99 mmHg
• 81 mmHg

Finally, I had check my blood pressure and compare it to the second test.

Notes:

• At that time I was suffering from a slight flu, so the values can be considered justified.
• The OMRON digital pressure gauge detects Korotkoff sounds while the cuff is inflated. My design detects Korotkoff sounds while the cuff deflates.

DATA COMPARISONS:

• My device: according to the theory seen on sections 2 and 3, my systolic pressure is 139 mmHg, and my diastolic pressure is 99 mmHg (or 81 mmHg).
• The OMRON device: it tells me that my systolic pressure is 137 mmHg, and my diastolic pressure is 95 mmHg.