Polyhedral surgical tool defining method for surgical navigation system

Abstract

The invention discloses a polyhedral surgical tool defining method for a surgical navigation system, and belongs to the field of medical instruments. According to the method, a polyhedron is rotated,so that central normal vectors of all curved surfaces on the polyhedron directly face an infrared optical sensor in sequence; space coordinates of all points on each curved surface are collected in sequence through the infrared optical sensor; when three of the points on the current curved surface coincide with three of the points on the next curved surface, by a spatial three-point coincidence method, space coordinates of other points on the next curved surface relative to the previous curved surface are calculated, and then the relative positions of all the points on the polyhedron which canbe identified by the infrared optical sensor are calculated in the same way; and finally, a geometric distribution rule of all the points is calculated through spatial multi-point fitting, and one point is fitted according to the spatial geometric distribution rule to serve as an original point of a polyhedral surgical tool. According to the method, a definition of the polyhedral surgical tool inthe surgical navigation system is finished, and 360-degree dead-corner-free tracking of the polyhedral surgical tool by the infrared optical sensor is realized.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a method for defining polyhedral surgical tools in a surgical navigation system. Background technique [0002] Surgical navigation system is more and more widely used clinically because of its ability to observe the position of surgical instruments in real time during surgery. Establish a spatial coordinate system for the data source, and realize the transformation from the spatial coordinate system to the image coordinate system by calculating the conversion relationship between the two coordinate systems, that is, registration, so as to achieve the purpose of real-time tracking and acquisition of surgical instruments during surgery. [0003] Registration is an essential and key step in the use of 3D orthopedic surgery navigation. The traditional registration method is mostly done in the form of landmarks. When scanning patient images, a certain number of landmarks are placed ...

AI Technical Summary

Problems solved by technology

However, this method needs to accurately measure the spatial trajectory of the center point of the C-arm during the operation. The traditional positioning method of navigating surgical tools will reduce the accuracy when the angle between the infrared optical sensor and the normal vector of the tool becomes larger, which cannot meet the clinical requirements. The need for precision

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