	US 12,076,093 B2
	Method of calibrating a spinal cage
Thomas Drexl, Munich (DE); Dimitrij Surmeli, Munich (DE); and Amar Husejic, Munich (DE)
Assigned to BRAINLAB AG, Munich (DE)
Appl. No. 17/599,156
Filed by Brainlab AG, Munich (DE)
PCT Filed Sep. 30, 2020, PCT No. PCT/EP2020/077327 § 371(c)(1), (2) Date Sep. 28, 2021, PCT Pub. No. WO2022/069028, PCT Pub. Date Apr. 7, 2022.
Prior Publication US 2022/0304753 A1, Sep. 29, 2022
Int. Cl. A61B 34/20 (2016.01); A61B 34/10 (2016.01); A61F 2/44 (2006.01); A61F 2/46 (2006.01)

CPC A61B 34/20 (2016.02) [A61B 34/10 (2016.02); A61F 2/4657 (2013.01); A61B 2034/102 (2016.02); A61B 2034/2055 (2016.02); A61B 2034/2068 (2016.02); A61F 2/447 (2013.01); A61F 2002/4658 (2013.01); A61F 2002/4663 (2013.01)]

25 Claims

1. A computer implemented medical method of calibrating a cage, comprising the steps:

acquiring, by holding a pointer tip of a pointing device against a cage tip of the cage, a cage tip coordinate at the cage tip of the cage, wherein the cage tip is disposed at a first end of the cage in a length direction of the cage;

acquiring, by holding the pointer tip of the pointing device against a cage end of the cage, a cage end coordinate at the cage end of the cage, wherein the cage end is disposed at a second end of the cage, opposing to the first end, in the length direction;

acquiring, by holding a pointer shaft of the pointing device against a cage side of the cage, at least one axis along the side of the cage, wherein the pointer shaft relates to a part of the pointing device, extending away from the pointer tip; and

determining a calibrated virtual model of the cage using the cage tip coordinate, the cage end coordinate and at least one cage axis.