Patent ID: 9332912
Filing Date: 2016-05-10
CPC Classification: A61B

Claim Text:
1. An electronic sphygmomanometer comprising: a cuff that is configured to be placed on a blood pressure measurement site; a pressure detection unit that detects a cuff pressure representing a pressure inside the cuff; a volume detection unit provided in the cuff that detects an arterial volume signal showing an arterial volume of the blood pressure measurement site in a process of changing the cuff pressure, wherein the arterial volume signal changes depending on a pulse wave associated with each heart beat; a cuff pressure adjustment unit that adjusts the cuff pressure by pressurization and depressurization; and a blood pressure measurement unit, wherein the blood pressure measurement unit comprises: wherein the servo control unit updates the servo gain every pulse wave, such that the control deviation, which is the difference between the value of the arterial volume signal detected by the volume detection unit and the control target value, indicates a value that is less than a control deviation target value, which is the control deviation detected by the control deviation detection unit in a period during which the rate of change sequentially detected by the rate-of-change detection unit is deemed to be constant.