公开(公告)号：US20180296133A1

公开(公告)日：2018-10-18

申请号：US15767336

申请日：2015-12-11

Applicant: Brainlab AG

Inventor： Christian BRACK ,  Mario SCHUBERT

IPC: A61B5/11 ,  A61B5/00

CPC classification number: A61B5/1121 ,  A61B5/1079 ,  A61B5/1127 ,  A61B5/4504 ,  A61B5/4528 ,  A61B5/6878 ,  G06T7/0012

Abstract: A computer implemented method for determining a center of rotation of a bone, comprising the steps of: a) acquiring image data representing a plurality of images taken by a camera while the bone is being rotated about the center of rotation, wherein the images show a marker device attached to the bone; b) forming a plurality of image pairs from the image data, wherein each image pair comprises two different images; c) determining a first relative position of the marker device relative to the camera from a first image of an image pair; d) determining a second relative position of the marker device relative to the camera from a second image of the same image pair; e) calculating a transformation of the first relative position into the second relative position; f) repeating steps c) to e) for all image pairs to obtain a plurality of transformations; and calculating the location of the center of rotation of the bone relative to the marker device from the plurality of transformations.

公开(公告)号：US20200305976A1

公开(公告)日：2020-10-01

申请号：US16306991

申请日：2018-03-01

Applicant: Brainlab AG

Inventor： Steffen BECK ,  Mario SCHUBERT ,  Christian BRACK ,  Luise POITZSCH

IPC: A61B34/10 ,  G06T3/60 ,  G06T7/00 ,  G06T11/00

Abstract: The invention relates to a method of determining the sagittal rotation of a patient's pelvis based on a standard anterior posterior X-ray-image with known image parameters and a calibration of the image, for example by using at least one King-Mark calibration object. The angle of the pelvic rotation is determined between a pelvic plane which is orthogonal to the midsagittal plane of the pelvis, and the image plane of the X-ray-image. Assuming the patient's position shown on the X-ray-image represents a standard neutral position, the X-ray-image plane can be used as a functional reference plane for further calculations, for example during hip-replacement surgery. The present invention further relates to a corresponding computer program and system.

公开(公告)号：US20180140232A1

公开(公告)日：2018-05-24

申请号：US15794754

申请日：2017-10-26

Applicant: Brainlab AG

Inventor： Oliver FLEIG ,  Christian BRACK ,  Zohar LEDER ,  Martin BAUER

IPC: A61B5/11 ,  A61B5/00 ,  A61B5/107 ,  A61B90/00 ,  A61B34/20 ,  A61B34/10

CPC classification number: A61B5/1121 ,  A61B5/1072 ,  A61B5/4585 ,  A61B34/10 ,  A61B34/20 ,  A61B90/361 ,  A61B90/39 ,  A61B2034/104 ,  A61B2034/2055 ,  A61B2090/397

Abstract: A data processing method for determining a range of motion of an artificial knee joint which connects a femur and a tibia via a medial ligament and a lateral ligament, wherein at least the femur comprises an implant which forms a medial condyle and a lateral condyle, the method comprising the steps of: acquiring the maximum lengths of the lateral ligament and the medial ligament for a particular flexion angle of the knee joint; calculating a first virtual position between the femur and the tibia in which the lateral condyle of the femoral implant touches the tibia and the medial ligament is stretched to its maximum length; calculating a maximum valgus angle of the range of motion from the first virtual position; calculating a second virtual position between the femur and the tibia in which the medial condyle of the femoral implant touches the tibia and the lateral ligament is stretched to its maximum length; and calculating a maximum varus angle of the range of motion from the second virtual position.