Individualized craniofacial navigation and registration guide plate and its registration method

Abstract

The invention belongs to the technical field of craniomaxillofacial surgery, in particular to an individualized craniomaxillofacial navigation and registration guide plate and a registration method thereof, including an occlusal plate and registration marker points, the registration marker points being 1 mm in diameter and 1 mm in depth Cone; designed by computer, its main structure includes two parts, that is, the part of the occlusal plate that can be in close contact with the maxillary dentition, and the registration landmarks that are discretely distributed on the sides and wings of the guide plate for point registration. Patients only need to take an imaging examination at the first visit, which can avoid secondary radiation damage; at the same time, a plaster model of the maxillary dentition is prepared. The individualized craniomaxillofacial navigation and registration guide is a novel guide, which combines computer-aided design technology, 3D printing technology and navigation technology; its corresponding registration method uses the registration landmark points of virtual design to complete the system registration, It is an innovative registration method.

Description

technical field [0001] The invention belongs to the technical field of craniomaxillofacial surgery, and in particular relates to an individualized craniomaxillofacial navigation and registration guide plate and a registration method thereof. Background technique [0002] Registration is an important process in the implementation of surgical navigation techniques. As the key core technology in optical navigation, registration technology is directly related to the accuracy of the whole system and the success or failure of computer-assisted surgery. The so-called registration refers to the virtual coordinate system, that is, the coordinate system formed in the computer image space after the single-mode or multi-mode medical images such as CT and MRI acquired before the operation are processed in the computer image space, and the world coordinate system, that is, the navigation during the operation. The coordinate system constructed by the positioning device of the system and t...

AI Technical Summary

Problems solved by technology

[0004] However, the inventors found in clinical work that for navigation-assisted cranio-maxillofacial surgery (excluding the mandible), using point registration, it is necessary to implant 4-5 pieces of titanium nails in the patient's maxillary alveolar bone before surgery As a registration landmark point, a second CT examination is required to visualize the titanium nail, so that the titanium nail can be recognized by the navigation system. The implantation of the titanium nail is carried out under local anesthesia, but it is an invasive operation for the patient. There will be discomfort and even strong pain after the titanium nail is implanted, and painkillers need to be taken, and another CT examination will cause secondary radiation damage to the patient

[0005] Sticking markers that can be visualized by imaging examinations on the cranio-maxillofacial region for point registration, there is a risk of falling off before or during the operation, which will affect the registration process of navigation, while the occlusal plate made of self-curing plastic, And embedding screws or dental materials in the occlusal plate as markers for point registration requires a long preparation time before the operation. Similarly, in the above two methods, in order to make the markers visible, the CT examination will also give the patient secondary radiation damage

[0006] Using anatomical landmarks for point registration usually selects the cusps, sockets or gaps of the maxillary teeth. However, CT examinations have a certain magnification of the teeth, and the above structures cannot be clearly displayed, so that the actual anatomical structure of the patient cannot be compared with the image. The errors between the structures of the medical data will increase the target registration error of the navigation system. Moreover, the above structures are all adjacent to the maxillary occlusal plane, that is, the dispersion is low, which will cause the navigation system to accurately understand the anatomical structure of the surgical area far away from the maxillary teeth. The target registration error increases, so anatomical landmarks cannot be used as the best choice for point registration in craniofacial navigation surgery

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