MEASURING INSTRUMENT FOR MODULUS OF LONGITUDINAL ELASTICITY OF VITAL BLOOD VESSEL TISSUE

摘要

PROBLEM TO BE SOLVED: To provide a measuring instrument with which modulus of longitudinal elasticity that is one of a mechanical property can be measured by change of diameter of an artery of an animal (particularly human). SOLUTION: The measuring instrument allows easily obtaining deformation resistance of an artery by recording the movement of an artery of an animal including human as an ultrasonic image and calculating the modulus of longitudinal elasticity (Young's modulus) by measuring changes in blood pressure and diameter of blood vessel and by inserting the results into a mechanical control equation. The instrument facilitates the difficulty when the ultrasonic image of artery is inserted and the image of vessel is placed on a specific position (on horizontal line or radial line) and to an area to be measured (square making). The image is recorded for a few seconds (corresponding to the cycle of expansion and contraction of blood vessel) to display the value of the Young's modulus easily. Since middle or long period continuous measurement is important because of deterioration of a mechanical property of blood vessel along with time, the instrument allows recording of long-term data for a subject and data can be taken out anytime.