Patent ID: 9072436
Filing Date: 2015-07-07
Classification: A61B

Abstract:
1. A blood pressure information measurement device comprising: a fluid bad including a first air bag, a second air bag, and a third air bag, said fluid bag arranged such that the three air bags are independently pressure controlled and are closely attached to each other in a direction from a peripheral side, which is closest to a wrist being measured, towards a central side, which is furthest from the wrist being measured, when a cuff including the fluid bag is attached to a measurement site; an inner pressure adjustment unit including an air pump, a first air valve connected to the first air bag and a second air valve connected to the second air bag for adjusting an inner pressure of the fluid bag; a connection unit including a first two-port electromagnetic valve connected between the first air bag and the second air bag, and a second two-port electromagnetic valve connected between the second air bag and the third air bag, each of said first and second two-port electromagnetic valves being configured to switch between a connection state and a disconnection state; a control unit for controlling the inner pressure of each of the air bags by controlling the inner pressure adjustment unit and the connection unit; and a measurement unit for acquiring blood pressure information based on a change in the inner pressure of the fluid bag, wherein the control unit performs, as a first control, a control for changing the respective inner pressure of the air bags at a same pressure such that the first air valve and the second air valve are closed and, at a same time, the three air bags are connected to each other through the first and second two-port electromagnetic valves, which are both in the connection state, and wherein the control unit performs, as a second control, a control for changing the respective inner pressure of the three air bags at different pressures such that the first air valve is maintained closed and the first two-port electromagnetic valve is turned to the disconnection state to set the first air bag at a first predetermined pressure, the second air valve is opened to set the second air bag at a second predetermined pressure that is less than the first predetermined pressure, and the second two-port electromagnetic valve is controlled between the disconnection state and the connection state to set the third air bag at a third predetermined pressure that is between the first and second predetermined pressures, and wherein the measurement unit calculates a blood pressure value as the blood pressure information based on the change in the inner pressure of the fluid bag by the first control in the control unit, and acquires a pulse wave waveform as the blood pressure information based on the change in the inner pressure of the fluid bag by the second control in the control unit.