A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/101
A61B 5/02 (2006.01) A61B 5/022 (2006.01)
Patent
CA 1171689
ABSTRACT OF THE DISCLOSURE: The sphygmomanometer comprises an arm band having an inflatable cuff and a microphone, and an instrument connected to the arm band, which contains the necessary pneumatic and electronics elements. By means of the micro- phone and an amplifier, electrical signals corresponding to the Korotkoff sounds are generated during the decompres- sion phase, and are applied to a discriminator. At the appearance of the first and the last signals, corresponding to the Korotkoff sounds, and each having an amplitude at least equal to a-threshold value, the pressure in the cuff is measured and stored in memory as the systolic pressure and diastolic pressure, respectively. During the decompres- sion phase, the threshold value is first decreasing like a value proportional to the pressure in the cuff; then it increases at appearance of each signal corresponding to a Korotkoff sound and exceeding the instananeous value of the threshold level, after which it decreases again. This varia- tion of the threshold value allows an exact determination of the blood pressure, eliminating in the optimum manner the parasite signals over a large range of pressures and in a large domain of Korotkoff sound intensities.
401565
Bernau Werner
Hatschek Rudolf
Asulab S.a.
Robic Robic & Associes/associates
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