公开(公告)号：US20210212790A1

公开(公告)日：2021-07-15

申请号：US17216182

申请日：2021-03-29

Applicant: OLYMPUS CORPORATION

Inventor： Katsuhiko YOSHIMURA ,  Kazunori TOKIWA

IPC: A61B90/00 ,  A61B1/00 ,  A61B5/06

Abstract: A distance-measuring method includes acquiring a first curvature angle of a curved portion in a first state in which an endoscope is inserted into a body cavity and captures an observation target, a second curvature angle of the curved portion in a second state in which an insertion direction of the endoscope is changed with a position of a trocar as a pivot point while capturing the same observation target as in the first state, a change amount in an insertion angle due to a change in the insertion direction, and an insertion amount of the endoscope from the pivot point of the trocar to the curved portion, so as to calculate a distance from a distal end portion of the endoscope to the observation target in a state in which the endoscope is inserted into the body cavity via the trocar.