Electronic blood pressure measurement device and blood pressure measuring method

A blood pressure measurement device comprising:

• a measurement bladder that is inflated when supplied with fluid and is configured to be wound around a region for blood pressure measurement;
• a pressure detection portion detecting pressure in said measurement bladder;
• a circumferential length detection portion detecting the circumferential length of said region during winding said measurement bladder around said region after a predetermined amount of said fluid has been supplied to and enclosed in said measurement bladder;
• and
• a blood pressure calculation portion calculating a blood pressure value based on said pressure detected and said circumferential length of said region, wherein
• said circumferential length detection portion detects the circumferential length of said region based on the time period required for raising to a predetermined value the difference between;
• (1) the pressure detected by said pressure detection portion when said measurement bladder is wound around said region after said predetermined amount of fluid has been enclosed in said measurement bladder;
• and (2) the pressure which is sequentially detected by said pressure detection portion during further winding said measurement bladder around said region.

A blood pressure measurement device comprising:

• a measurement bladder that is inflated when supplied with fluid and is configured to be wound around a region for blood pressure measurement;
• a pressure detection portion detecting pressure in said measurement bladder;
• a circumferential length detection portion detecting the circumferential length of said region during winding said measurement bladder around said region after a predetermined amount of said fluid has been supplied to and enclosed in said measurement bladder;
• and
• a blood pressure calculation portion calculating a blood pressure value based on said pressure detected and said circumferential length of said region, wherein
• said circumferential length detection portion detects the circumferential length of said region based on the difference between:
• (1) the pressure detected by said pressure detection portion when said measurement bladder is wound around said region after said predetermined amount of fluid has been enclosed in said measurement bladder;
• and (2) the pressure detected by said pressure detection portion when a predetermined time period has elapsed since the start of further winding of said measurement bladder around said region.