PROBLEM TO BE SOLVED: To provide a blood vessel diameter measurement device capable of correctly measuring the diameter of a blood vessel.SOLUTION: The blood vessel diameter measurement device includes a control circuit for calculating the outer diameter and the inner diameter of a blood vessel on the basis of arrival times from the sending of ultrasonic waves from three ultrasonic arrays 11 to the arrival of the ultrasonic waves at the ultrasonic arrays 11 after reflection against a blood vessel. The control circuit includes: a signal delay circuit for controlling the sending angles of the ultrasonic waves so as to allow the ultrasonic waves to pass the center of the vessel a reception measurement unit for measuring a first arrival time of a first reflection wave that is reflected against a blood vessel and arrives at the ultrasonic array 11 first and a second arrival time of a second reflection wave that arrives at the ultrasonic array 11 after a predetermined time elapse from the first arrival time an outer diameter calculation unit for calculating the outer diameter R of a blood vessel on the basis of the first arrival times of the three first reflection waves and an inner diameter calculation unit for calculating the inner diameter r of a blood vessel on the basis of the second arrival times of the three second reflection waves.COPYRIGHT: (C)2014,JPO&INPIT【課題】正確な血管の径を測定できる血管径測定装置を提供する。【解決手段】3つの超音波アレイ11から超音波が発信されてから血管で反射して超音波アレイ11に到達するまでの到達時間に基づいて血管の外径及び内径を算出する制御回路とを備える。制御回路は、超音波が血管の中心を通過するように超音波の発信角度を制御する信号遅延回路と、血管で反射されて、最も早く超音波アレイ11に到達する第1反射波の第1到達時間、及び第1到達時間から所定時間経過後に超音波アレイ11に到達した第2反射波の第2到達時間を測定する受信計測部と、3つの第1反射波の第1到達時間に基づいて血管の外径Rを算出する外径算出部と、3つの第2反射波の第2到達時間に基づいて血管の内径rを算出する内径算出部とを備える。【選択図】図8
