Patent ID: 7316651

Claim:
A method for automatically calibrating electronic sphygmomanometer, said sphygmomanometer including a normally used pressure sensor set and at least second and third additional sensors, comprising the steps of: turning on a power supply; setting a control module coupled to a power module at an operating mode; said control module controlling an air pump module to pressurize an electronic sphygmomanometer to a predetermined pressure value; opening a valve of a used pressure sensor set in said electronic sphygmomanometer and also opening a valve of another pressure sensor set at the same time, said pressure sensors being capable of detecting a change of pressure, converting said change of pressure into a numeric value, and sending said numeric value to a processor of said control module, said control module sending said predetermined pressure value and a detected pressure value of each pressure sensor of said pressure sensor set to a display module; and said control module comparing the received numeric values, thereby comparing an air pressure value of said used pressure sensor set with an air pressure value of said second pressure sensor; wherein: if said air pressure reading of the used pressure set matches with said air pressure reading of said second pressure sensor, then said used pressure sensor set is determined to be normal and calibration is ended: if said air pressure reading of the used pressure sensor set does not match an air pressure reading of said second pressure sensor, then said second pressure sensor is compared with a third pressure sensor; if an air pressure reading of the second pressure sensor does not match an air pressure reading of the third pressure sensor, then said used pressure sensor is determined to be normal and calibration is ended; if said air pressure reading of the another pressure sensor matches an air pressure reading of the third pressure sensor, then said used pressure sensor set is determined to be abnormal, and said air value connected to said used pressure sensor set is shut off, in which case, when a blood pressure is measured at a next time, a user is capable of using another normal pressure sensor for the measurement, not only maintaining a continuous use of said electronic sphygmomanometer, but also allowing users to calibrate said electronic sphygmomanometer on their own.