PROBLEM TO BE SOLVED: To provide a blood vessel diameter measurement device capable of measuring the accurate diameter of a blood vessel.SOLUTION: The blood vessel diameter measurement device includes a control circuit for calculating the outside diameter and inside diameter of a blood vessel on the basis of the arrival time from the time when ultrasonic waves are transmitted from three ultrasonic arrays 11 until the time when they are reflected by the blood vessel and reach the ultrasonic arrays 11. The control circuit includes: a signal delay circuit for controlling a transmission angle of ultrasonic waves so that the ultrasonic waves pass through the center of the blood vessel a reception measurement unit for measuring the first arrival time of a first reflected wave, which is reflected by a blood vessel and is first to arrive at the ultrasonic arrays 11, and a second arrival time of a second reflected wave which arrives at the ultrasonic arrays 11 after a predetermined time elapses from the first arrival time an outside diameter computation unit for computing an outside diameter R of the blood vessel based on the first arrival time of three first reflected waves and an inside diameter computation unit for computing an inside diameter r of the blood vessel based on the second arrival time of three second reflected waves.COPYRIGHT: (C)2012,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
