Abstract: A connection device and a surgical navigation system are provided. The connection device is configured to connect two adjacent cascade tubes of the surgical navigation system. The connection device includes: a connection tube, a butting tube, a sleeve, and positioning balls. The connection tube and the butting tube are respectively arranged at two ends of the cascade tubes. The butting tube on one of the cascade tubes is configured to sleeve an outer wall of the connection tube on the other cascade tube. The connection tube is provided with a connection protrusion. A connection slot communicated to the inside of the butting tube is provided in an inner wall of the butting tube.

Abstract: The present invention relates to the technical field of dental image display. It provides a dental image display method and a dental handpiece. First, a 3D tooth image is formed via scanning. Then, at each moving position, a light-sensing component and a first camera respectively collect the first and second partial dental arch images, and a positional association is established between them. When the dental handpiece operates in the oral cavity, a second camera captures a real-time image. Based on this image, the partial dental arch image targeted by the handpiece's working component is determined and displayed on the handpiece's screen. This invention overcomes the prior-art problem of blocked sight during operation, facilitating the doctor's work and enabling the handpiece to function as an oral mirror.

Abstract: A stackable quick-release apparatus and a surgical navigation system are provided. The stackable quick-release apparatus is configured to connect two adjacent cascade tubes of the surgical navigation system. The stackable quick-release apparatus includes a connection rod, an abutment rod, and an elastic member. The connection rod is arranged at an end of one of the cascade tubes, and the abutment rod is arranged at an end of the other of the cascade tubes. A mounting groove is provided on an end surface of the connection rod, the elastic member is configured to be mounted on an inner wall of the mounting groove, and the abutment rod on one of the cascade tubes is configured to be inserted into the mounting groove of the connection rod on the other of the cascade tubes and abut against the elastic member.

Abstract: A stackable quick-release apparatus and a surgical navigation system are provided. The stackable quick-release apparatus is configured to connect two adjacent cascade tubes of the surgical navigation system. The stackable quick-release apparatus includes a connection rod, an abutment rod, and an elastic member. The connection rod is arranged at an end of one of the cascade tubes, and the abutment rod is arranged at an end of the other of the cascade tubes. A mounting groove is provided on an end surface of the connection rod, the elastic member is configured to be mounted on an inner wall of the mounting groove, and the abutment rod on one of the cascade tubes is configured to be inserted into the mounting groove of the connection rod on the other of the cascade tubes and abut against the elastic member.

Abstract: A connection device and a surgical navigation system are provided. The connection device is configured to connect two adjacent cascade tubes of the surgical navigation system. The connection device includes: a connection tube, a butting tube, a sleeve, and positioning balls. The connection tube and the butting tube are respectively arranged at two ends of the cascade tubes. The butting tube on one of the cascade tubes is configured to sleeve an outer wall of the connection tube on the other cascade tube. The connection tube is provided with a connection protrusion. A connection slot communicated to the inside of the butting tube is provided in an inner wall of the butting tube.

Abstract: A multi-view human action recognition method based on hypergraph learning, comprising acquiring video data from P views, and further comprising the following steps: pre-processing the video data; constructing spatial hypergraphs based on joint information; constructing temporal hypergraphs based on the joint information; performing feature learning of the spatial hypergraphs and the temporal hypergraphs using hypergraph neural networks; and extracting higher order information represented by the hypergraphs, and performing action recognition of human actions.

Abstract: Examples of a probe for microwave ablation are disclosed. The probe comprises a feed coaxial cable and an antenna that has a cylindrical outer housing with a predetermined diameter and a predetermined length defining a cavity therein and a radiating conductor positioned within the cavity with a matching stepped portion. The antenna further comprises a dielectric material placed in the cavity between the radiating conductor and the outer housing of the antenna to increase the mechanical strength of the probe as well as to improve the power coupling to the tissue to be ablated. The design of the coaxial cavity of the antenna with radiating conductor with a stepped portion fitted into dielectric materials increases antenna's mechanical strength to withstand higher temperatures and reduces an energy reflected back to the feed coaxial cable due to a good impedance match between the antenna and the feed cable such that antennas with smaller length can be used to fit curved paths.

Abstract: Examples of a probe for microwave ablation are disclosed. The probe comprises a feed coaxial cable and an antenna that has a cylindrical outer housing with a predetermined diameter and a predetermined length defining a cavity therein and a radiating conductor positioned within the cavity with a matching stepped portion. The antenna further comprises a dielectric material placed in the cavity between the radiating conductor and the outer housing of the antenna to increase the mechanical strength of the probe as well as to improve the power coupling to the tissue to be ablated. The design of the coaxial cavity of the antenna with radiating conductor with a stepped portion fitted into dielectric materials increases antenna's mechanical strength to withstand higher temperatures and reduces an energy reflected back to the feed coaxial cable due to a good impedance match between the antenna and the feed cable such that antennas with smaller length can be used to fit curved paths.