Abstract
The purpose of this study is to analyze effects on the insertion path of ultra-fine needle by pressing the ultrasonic probe. We developed a hypothesis that the insertion path is affected by the stress field and the insertion angle which occur with deformation of the issue. Then, to examine the degree of effect of each factor, we compared the deflection of the needle caused by the both of stress field and insertion angle with that caused by only insertion angle. As a result, it was revealed that insertion angle is a major cause of the change of the insertion path. Furthermore, it was shown that it is possible to reduce the change of insertion path by the guide to eliminate the insertion angle with deformation of the issue.
