Paragraph Number

137

In one embodiment, the user may re-orient and/or position the surgical device 200c for the calibration by resting the superior surface 226 of the housing 220 on the surface of the skin 606 of the patient in a position substantially centered above a patient’s spine (e.g., one or more vertebrae 608). In this manner, the superior surface 226 (with the surgical device 200c positioned as shown in FIG. 5) serves to define, or serves as a suitable proxy to define, the horizontal plane 614 during a calibration mode. As explained above, the reference axis 130 can be defined as an axis perpendicular to the horizontal plane 614.

Added by DJM 1 2022