Sphygmomanometer, blood pressure measurement method, and computer-readable recording medium
A sphygmomanometer according to the present invention includes a pump that supplies a fluid to a blood pressure measurement cuff, a pressure sensor that detects a pressure of the cuff, a first valve for regular measurement, and a second valve for emergency exhaust. A blood pressure measurement unit measures a blood pressure of a measurement target site by controlling operations of the pump and the first and second valves on the basis of the pressure of the cuff. The abnormality determination unit supplies the fluid to the cuff by the pump in a state where a closing instruction is given to the first valve and an opening instruction is given to the second valve, and determines whether or not there is an abnormality in an emergency exhaust function according to a degree of increase in the pressure of the cuff.
1 . A sphygmomanometer that performs blood pressure measurement by temporarily compressing a measurement target site by a blood pressure measurement cuff, the sphygmomanometer comprising:
a pump that supplies a fluid to the cuff to pressurize the cuff;
a pressure sensor that detects a pressure of the cuff;
a first valve for regular measurement that is fluid-communicatively connected to the cuff and discharges the fluid from the cuff to depressurize the cuff during blood pressure measurement;
a second valve for emergency exhaust that is fluid-communicatively connected to the cuff and discharges the fluid from the cuff to depressurize the cuff when an abnormality occurs in which discharge of the fluid by the first valve is not normally performed;
a blood pressure measurement unit that controls operations of the pump and the first and second valves on a basis of the pressure of the cuff output from the pressure sensor to measure a blood pressure of the measurement target site; and
an abnormality determination unit that performs a determination process of determining whether or not there is an abnormality in an emergency exhaust function, wherein
the abnormality determination unit is configured to, prior to the blood pressure measurement by the blood pressure measurement unit, supply the fluid to the cuff by the pump in a state where a closing instruction is given to the first valve and an opening instruction is given to the second valve, and,
if the pressure of the cuff becomes equal to or higher than a first reference pressure within a first reference time from a start of driving of the pump, determine that the second valve is abnormal and that there is an abnormality in the emergency exhaust function, whereas if the pressure of the cuff remains lower than the first reference pressure until the first reference time elapses from the start of driving of the pump, determine that there is no abnormality in the emergency exhaust function regardless of whether the first valve is normal or abnormal, and
the blood pressure measurement unit is configured to, upon start of blood pressure measurement, supply the fluid to the cuff by the pump in a state where closing instructions are given to both the first valve and the second valve, and,
if the pressure of the cuff does not become equal to or higher than a second reference pressure within a second reference time from the start of driving of the pump, determine that a measurement error has occurred.
2 . The sphygmomanometer according to claim 1 , wherein
the abnormality determination unit performs the determination process prior to the blood pressure measurement each time the blood pressure measurement unit performs the blood pressure measurement.
3 . The sphygmomanometer according to claim 1 , wherein
when the abnormality determination unit determines that there is an abnormality in the emergency exhaust function, the blood pressure measurement unit stops the blood pressure measurement for the measurement target site, while when the abnormality determination unit determines that there is no abnormality in the emergency exhaust function, the blood pressure measurement unit starts the blood pressure measurement.
4 . The sphygmomanometer according to claim 1 , wherein
the first valve is a normally open valve that is open in its resting state until closed, and
the second valve is a normally closed valve that is closed in its resting state until open.
5 . The sphygmomanometer according to claim 1 , comprising
an automatic measurement mode in which the blood pressure measurement is automatically started according to a schedule set in advance, wherein
in the automatic measurement mode, the abnormality determination unit performs the determination process prior to the blood pressure measurement each time the blood pressure measurement unit performs the blood pressure measurement according to the schedule.
6 . The sphygmomanometer according to claim 5 , comprising
a regular blood pressure measurement mode in which the blood pressure measurement is performed in response to an input blood pressure measurement instruction, wherein
in the regular blood pressure measurement mode, the abnormality determination unit does not perform the determination process, and the blood pressure measurement unit measures the blood pressure of the measurement target site in response to the input blood pressure measurement instruction.
7 . The sphygmomanometer according to claim 5 , wherein
when a transition instruction to transition to the automatic measurement mode is input, the abnormality determination unit performs the determination process in response to the transition instruction, and
when determining that there is an abnormality in the emergency exhaust function, the abnormality determination unit prohibits the sphygmomanometer from transitioning to the automatic measurement mode, while when determining that there is no abnormality in the emergency exhaust function, the abnormality determination unit allows the sphygmomanometer to transition to the automatic measurement mode.
8 . The sphygmomanometer according to claim 1 , comprising
a notification unit that notifies that there is an abnormality in the emergency exhaust function when the abnormality determination unit determines that there is an abnormality in the emergency exhaust function.
9 . The sphygmomanometer according to claim 1 , wherein
the blood pressure measurement unit and the abnormality determination unit are constituted of a programmed first processor and a programmed second processor different from the first processor,
the first valve is driven by the first processor, and
the second valve is driven by the second processor.
10 . A blood pressure measurement method for performing blood pressure measurement by the sphygmomanometer according to claim 1 , comprising:
the blood pressure measurement method comprising:
a determination step by the abnormality determination unit of, prior to blood pressure measurement by the blood pressure measurement unit, supplying the fluid to the cuff by the pump in the state where the closing instruction is given to the first valve and the opening instruction is given to the second valve, and,
if the pressure of the cuff becomes equal to or higher than the first reference pressure within the first reference time from the start of driving of the pump, determining that the second valve is abnormal and that there is the abnormality in the emergency exhaust function, whereas if the pressure of the cuff remains lower than the first reference pressure until the first reference time elapses from the start of driving of the pump, determining that there is no abnormality in the emergency exhaust function regardless of whether the first valve is normal or abnormal; and
a measurement step by the blood pressure measurement unit of, upon start of blood pressure measurement by the blood pressure measurement unit, supplying the fluid to the cuff by the pump in the state where closing instructions are given to both the first valve and the second valve, and,
if the pressure of the cuff does not become equal to or higher than the second reference pressure within the second reference time from the start of driving of the pump, determining that the measurement error has occurred, whereas if the pressure of the cuff becomes equal to or higher than the second reference pressure within the second reference time from the start of driving of the pump, measuring a blood pressure of the measurement target site by controlling operations of the pump and the first and second valves on a basis of the pressure of the cuff output from the pressure sensor.
11 . A non-transitory computer-readable recording medium storing a program for causing a computer to execute the blood pressure measurement method according to claim 10 .
12 . A sphygmomanometer that performs blood pressure measurement by temporarily compressing a measurement target site by a blood pressure measurement cuff, the sphygmomanometer comprising:
a pump that supplies a fluid to the cuff to pressurize the cuff;
a pressure sensor that detects a pressure of the cuff;
a first valve for regular measurement that discharges the fluid from the cuff to depressurize the cuff during blood pressure measurement;
a second valve for emergency exhaust that discharges the fluid from the cuff to depressurize the cuff when an abnormality occurs in which discharge of the fluid by the first valve is not normally performed;
a blood pressure measurement unit that controls operations of the pump and the first and second valves on a basis of the pressure of the cuff output from the pressure sensor to measure a blood pressure of the measurement target site;
an abnormality determination unit that performs a determination process of supplying the fluid to the cuff by the pump in a state where a closing instruction is given to the first valve and an opening instruction is given to the second valve, and determining whether or not there is an abnormality in an emergency exhaust function according to a degree of increase in the pressure of the cuff; and
an automatic measurement mode in which the blood pressure measurement is automatically started according to a schedule set in advance, wherein
when a transition instruction to transition to the automatic measurement mode is input, the abnormality determination unit performs the determination process in response to the transition instruction, and
when determining that there is an abnormality in the emergency exhaust function, the abnormality determination unit prohibits the sphygmomanometer from transitioning to the automatic measurement mode, while when determining that there is no abnormality in the emergency exhaust function, the abnormality determination unit allows the sphygmomanometer to transition to the automatic measurement mode.