SCALE FOR COUNTING NUMBER OF WEEK OF PREGNANCY

摘要

PURPOSE:To obtain a scale for counting the number of pregnancy by performing rapid and secure appreciation by obtaining a fetus image by using ultrasonic waves and by measuring respective parts of the image. CONSTITUTION:Scale body 8 made of a transparent plate such as an acryl plate is provided size divisions 9 lengthwise at its upper stage and week divisions 10 and 11, corresponding the large horizontal diameter of the fetus head and ovisac GS, in the intermediate-part lengthwise direction. Respective week-number scales are given mean-value divisions 10a and 11a arranged in the intermediate parts and upper- limit value divisions 10b and 11b and low-limit value divisions 10c and 11c over and under respective mean divisions and corresponding parts of respective scales are connected by dashed lines. Relations between the GS diameter and fetus head large horizontal diameter, and the number of weeks of pregnancy can be measured only by using this scale 8 for a fetus image based upon an ultrasonic-wave image.