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

Claim 4:
5. A blood pressure measuring method for controlling an applied pressure applied to a region of a living body in which a vein and an artery exist by a cuff mountable to the region, the blood pressure measuring method comprising:
detecting pressure waveforms in which pulse wave components are overlapped with the applied pressure; and
obtaining an arterial pressure, a respiratory variation on a waveform of the artery, and a venous pressure, based on the pressure waveforms detected through onetime blood pressure measurement, wherein
the obtaining the arterial pressure includes obtaining at least a diastolic blood pressure and a systolic blood pressure based on data of a third pressure waveform of the pressure waveforms in a third process in which the applied pressure is increased from a first time point to a second time point at which the obtaining of the systolic blood pressure is completed,
the obtaining the respiratory variation on the waveform of the artery is based on data of a first pressure waveform of the pressure waveforms in a first process, in which the applied pressure is reduced from a value at which the obtaining of the systolic blood pressure is completed at the second time point to a value equal to or lower than the diastolic blood pressure and is kept constant until a first predetermined time period elapses at a third time point,
the obtaining the venous pressure includes (i) determining that the first predetermined time period measured from the second time point elapsed, (ii) causing the applied pressure to decrease based on the determining that the first predetermined time period elapsed, and (iii) obtaining 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 from the third time point until a second predetermined time period measured from the first time point elapses and (b) either the data of the third pressure waveform in the third process or the data of the first pressure waveform in the first process, and
the second predetermined time period is a term of obtaining the respiratory variation, the venous pressure, and the arterial pressure that is within 140 seconds.