Blood pressure estimating device
AssigneeMurata Manufacturing Co., Ltd.
InventorToru Shimuta
Life of this patent
Estimating the term…
Abstract
A signal processor of a blood pressure estimating device includes a pulse wave transit time acquirer that acquires a pulse wave transit time based on a pulse wave signal detected by a photoplethysmographic sensor and an electrocardiographic signal, a time measurer that measures a time elapsed from when acquisition of the pulse wave transit time is started, and a blood pressure estimator that estimates a blood pressure based on a predetermined relationship between the pulse wave transit time and the blood pressure. The photoplethysmographic sensor is in contact with a neck of a user at a position not directly over a carotid artery when the pulse wave transit time is acquired, and the blood pressure estimator estimates the blood pressure after the measured elapsed time has become a predetermined time or more.
Claims16
A blood pressure estimating device comprising:
- an electrocardiogramactrode that detects an electrocardiogramal;
- a photoplethysmographic sensor that includes a light emitter and a light receiver and that acquires a photoplethysmographic signal of an arteriole or a capillary;
- a pulse wave transit time acquirer that acquires a pulse wave transit time based on the electrocardiogramal detected by the electrocardiogramd the photoplethysmographic signal detected by the photoplethysmographic sensor;
- a time measurer that measures a time elapsed from start of acquisition of the pulse wave transit time by the pulse wave transit time acquirer;
- and
- a blood pressure estimator that estimates a blood pressure based on the acquired pulse wave transit time and a predetermined relationship between the pulse wave transit time and the blood pressure;
- wherein
- the blood pressure estimator estimates the blood pressure after the elapsed time measured by the time measurer has become a predetermined time or more;
- and
- the electrocardiogramactrode and the photoplethysmographic sensor are configured to detect the electrocardiogramal and acquire the photoplethysmographic signal at a same portion of a user's body.
A blood pressure estimating device comprising:
- an electrocardiogramalectrode that detects an electrocardiogramal;
- a photoplethysmographic sensor that includes a light emitter and a light receiver and that acquires a photoplethysmographic signal of an arteriole or a capillary;
- a pulse wave transit time acquirer that acquires a pulse wave transit time based on the electrocardiogramal detected by the electrocardiogramactrode and the photoplethysmographic signal detected by the photoplethysmographic sensor;
- a determiner that determines whether the pulse wave transit time has become stable after start of acquisition of the pulse wave transit time by the pulse wave transit time acquirer;
- and
- a blood pressure estimator that estimates a blood pressure based on the acquired pulse wave transit time and a predetermined relationship between the pulse wave transit time and the blood pressure;
- wherein
- the blood pressure estimator estimates the blood pressure after the determiner has determined that the pulse wave transit time has become stable;
- and
- the electrocardiogramactrode and the photoplethysmographic sensor are configured to detect the electrocardiogramal and acquire the photoplethysmographic signal at a same portion of a user's body.
Dependencies are inferred from the claim text.