Patent ID: 11903684
Assignee: NIHON KOHDEN CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 9:
10. A blood pressure measuring apparatus comprising:
a cuff that is mountable to a region of a living body in which a vein and an artery exist;
a pressure control unit that controls an applied pressure applied to the region by the cuff mounted to the region;
a detection unit that detects pressure waveforms in which pulse wave components from the region overlap with the applied pressure;
an analysis unit configured to obtain:
(i) an arterial pressure, a respiratory variation on a waveform of the artery, and a venous pressure, based on the pressure waveforms detected by the detection unit through onetime blood pressure measurement,
(ii) the respiratory variation on the waveform of the artery based on data of a first pressure waveform of the pressure waveforms in a first process, in which the applied pressure is kept at a constant pressure by the pressure control unit,
(iii) the venous pressure based on (a) data of a second pressure waveform of the pressure waveforms in a second process in which the applied pressure is decreased or increased by the pressure control unit and (b) either the data of a third pressure waveform in a third process or the data of the first pressure waveform in the first process, and
(iv) the arterial pressure based on data of the third pressure waveform of the pressure waveforms in the third process in which the applied pressure is decreased or increased by the pressure control unit,
wherein each of the respiratory variation, the venous pressure, and the arterial pressure is obtained for a corresponding obtaining term,
wherein the blood pressure measuring apparatus further comprises a determination unit configured to (i) determine that a first predetermined time period measured from a start of a measurement of the respiratory variation on the waveform of artery has elapsed, and (ii) cause the pressure control unit to decrease or increase the applied pressure in the second process based on the determining that the first predetermined time period has elapsed, and
wherein the analysis unit is configured to obtain the venous pressure using only the cuff.