PORTABLE TYPE BLOOD PRESSURE MEASURING INSTRUMENT

PROBLEM TO BE SOLVED: To provide a portable type blood pressure measuring instrument for always measuring a blood pressure in everyday life by fitting it on one arm of a subject. SOLUTION: This portable type blood pressure measuring instrument calculates a maximum value and a minimum value of a blood pressure by obtaining a transmission time of a plethysmogram by measuring a cardiac electric wave and the plethysmogram. The portable type blood pressure measuring instrument is equipped with a plethysmogram detecting means having a cardiac electric wave detecting means which has one electrode 1 coming into contact with the surface of a biological body 20 and a photoelectric sensor 31 coming into contact with the surface of the biological body. The cardiac electric wave detecting means detects a cardiac electric wave with a cardiac potential guided by the one electrode 1 as a potential for the ground of the cardiac electric wave detecting means. Also, the plethysmogram detecting means measures a pulse wave by the photoelectric sensor 31 which comes into contact with the surface of the biological body 20, and a pulse wave transmission time is obtained from a time difference between the cardiac electric wave R wave and a pulse wave peak. Then, the blood pressure is calculated based on a predetermined relative table for the pulse wave transmission time and the blood pressure. COPYRIGHT: (C)2004,JPO