公开(公告)号：US20220117672A1

公开(公告)日：2022-04-21

申请号：US17502664

申请日：2021-10-15

Applicant: Stryker European Operations Limited

Inventor： Fadi Ghanam ,  Yannik Guth

IPC: A61B34/20 ,  A61B90/00 ,  A61B17/17 ,  A61B17/16

Abstract: A method and device for determining a radius of a spherically shaped surface portion of a tip of an instrument. A first pose of a first tracker and a second pose of a second tracker may be determined while the spherically shaped surface portion is in abutment with a calibration structure. A reference position of a first reference point relative to the second tracker may be determined when the first tracker is in the first pose and the second tracker is in the second pose based on the first pose, the second pose, and a first predetermined relationship. A third pose of the first tracker and a fourth pose of the second tracker may be determined. The radius of the spherically shaped surface portion may be determined based on the third pose, a second predetermined relationship, a reference position, the fourth pose, and an opening angle.