| 摘要 |
A cuff (200; 500) is put around an upper arm, and the blood flow of the upper arm is shut by a blood flow shutting bag (210; 520). A sound wave sensor (110) and a pressure sensor (120) are disposed in a rear detecting bags (230; 530) downstream of the blood flow shutting bag to detect pulse waves and Korotkoff sounds. The reference internal pressure in the cuff is controlled by an air pump and a leak valve controlled by a CPU (130; 430; 640). By monitoring the Korotkoff sounds or the pulse waves, the reference internal pressure of the cuff can be maintained at a diastolic pressure DP. A pulse wave obtained at this pressure on an upper arm is approximate to an aortic wave. This approximate aortic wave is displayed together with the Korotkoff sounds and its envelope, and an output indicative of blood circulation trouble information of the circulation system is obtained.
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