Positioning method for craniomaxillofacial surgery

Abstract

The invention discloses a positioning method for a craniomaxillofacial surgery. The positioning method comprises the following steps of: first, producing an occlusal splint referring tracer according to a plaster model of dentition of a patient; secondly, fixing an occlusal splint in an oral cavity of the patient, performing CT (Computed Tomography) scanning on the patient to obtain CT scanning image data, and segmenting and reconstructing the CT scanning image data through CT image reconstruction software to obtain a triangular mesh model of soft and hard craniomaxillofacial tissues of the patient and the occlusal splint referring tracer; and thirdly, arranging a standard fixing reference frame at the head of the patient, reading a transformation matrix M2 of the occlusal splint referring tracer in a three-dimensional coordinate system of the standard fixing reference frame, solving a transformation matrix M of the standard fixing reference frame in the three-dimensional coordinate system of the head, solving a transformation matrix Mf of a light-reflecting ball array of a tool in the three-dimensional coordinate system of the head, tracing and navigating the light-reflecting ball array of the tool relative to the three-dimensional coordinate system of the head in real time, and positioning the light-reflecting ball array of the tool.

Description

technical field [0001] The invention relates to a positioning method for craniomaxillofacial surgery. Background technique [0002] In the traditional surgical treatment process, the surgeon formulates a surgical plan based on the patient's preoperative clinical examination and imaging data. During the operation, the surgeon can only rely on the surgeon's experience and surgical skills to implement the surgical plan. This method has high requirements on the skill of the surgeon and poor accuracy, and it is difficult to accurately determine the specific operation site during the operation. With the development of computer-aided design and computer surgery simulation technology, and the increasing requirements for surgical accuracy, navigation surgery technology has developed rapidly and is widely used in various fields of surgery. Surgical navigation technology can more accurately convert the preoperative surgical plan into the intraoperative surgical reality, so as to guide...

AI Technical Summary

Problems solved by technology

However, these two methods have defects such as cumbersome intraoperative operation, long registration time, poor registration accuracy and difficult identification of registration marker points.

Especially in the craniofacial field, the anatomical structure is complex and the operation space is limited, which increases the difficulty of navigation registration

Some navigation systems need to implant navigation pins in the patient's body before surgery in order to improve the registration accuracy, which increases the trauma to the patient

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