Patent ID: 8430821

Claim:
A blood pressure measuring apparatus comprising: a cuff member configured to be attached to and detached from a blood pressure measurement portion; a cuff main body including a compression air bladder which is formed on a side of said cuff member, which is in contact with the blood pressure measurement portion, and presses the blood pressure measurement portion, a sub air bladder which is formed on a side of said compression air bladder, which is in contact with the blood pressure measurement portion, and presses a heart side of the blood pressure measurement portion, and a pulse wave detection air bladder which is formed on the side of said compression air bladder, which is in contact with the blood pressure measurement portion, and detects a pulse wave downstream of a central portion of the blood pressure measurement portion; a compression air bladder pressurizing/depressurizing unit configured to pressurize/depressurize said compression air bladder and said pulse wave detection air bladder; a sub air bladder pressurizing/depressurizing unit configured to pressurize/depressurize said sub air bladder; a cuff pressure detecting unit configured to obtain a cuff pressure signal from said pulse wave detection air bladder; a sub air bladder pressure detecting unit configured to obtain a sub air bladder pressure signal from said sub air bladder; a pulse wave detecting unit configured to detect a pulse wave superposed on the cuff pressure signal, and obtaining a pulse wave signal; a blood pressure determining unit configured to determine a blood pressure value based on the cuff pressure signal and the pulse wave signal; a blood pressure display unit configured to display the blood pressure value; a first tube connected between said pulse wave detection air bladder and said cuff pressure detecting unit; a second tube connected between said compression air bladder and said compression air bladder pressurizing/depressurizing unit, and connected to said cuff pressure detecting unit via a fluid resistance; a third tube connected between said sub air bladder and said sub air bladder pressurizing/depressurizing unit, and connected to said sub air bladder and said sub air bladder pressurizing/depressurizing unit; and a control unit configured to control, after said compression air bladder and said sub air bladder are pressurized by said compression air bladder pressurizing/depressurizing unit and said sub air bladder pressurizing/depressurizing unit, said compression air bladder pressurizing/depressurizing unit and said sub air bladder pressurizing/depressurizing unit so as to depressurize said compression air bladder and said sub air bladder at the same depressurization rate, and obtain the pulse wave signal.