Positioning deviation warning method for surgical navigation and system thereof

A positioning deviation warning method for surgical navigation, comprising:

• configuring a navigation device to monitor a plurality of reference coordinates of a reference;
• configuring the navigation device to calculate a plurality of distance values between the reference and the navigation device according to the reference coordinates, wherein each of the distance values is a distance between each of the reference coordinates and the navigation device;
• configuring the navigation device to extract a portion of the distance values according to a time window and calculate a standard deviation of the portion of the distance values within the time window;
• and
• configuring the navigation device to determine whether the standard deviation of the portion of the distance values is greater than a predetermined standard deviation threshold.

A positioning deviation warning system for surgical navigation, comprising:

• a reference;
• and
• a navigation device, disposed toward the reference and configured to perform operations comprising:
• monitoring a plurality of reference coordinates of the reference;
• calculating a plurality of first distance values between the reference and the navigation device according to the reference coordinates, wherein each of the first distance values is a distance between each of the reference coordinates and the navigation device;
• extracting a portion of the first distance values according to a first time window and calculating a first amplitude of the portion of the first distance values within the first time window, wherein the portion of the first distance values comprises a plurality of second distance values, and the first amplitude is equal to a difference between a maximum distance value and a minimum distance value among the second distance values;
• extracting, according to a second time window corresponding to a time point, a portion of a plurality of the first amplitudes corresponding to a plurality of the time points and calculating a second amplitude of the portion of the first amplitudes within the second time window, wherein the portion of the first amplitudes comprises a plurality of amplitude values, and the second amplitude is equal to a difference between a maximum amplitude value and a minimum amplitude value among the amplitude values;
• and
• determining whether the second amplitude of the portion of the first amplitudes is greater than a predetermined threshold.