With the development of magnetic materials more widely used in surgical instruments, the development of magnetic surgery technology has continuously made breakthroughs and innovations. Magnetic anchor assist technology has become an important surgical method due to its precise positioning and non-contact traction. The majority of clinical magnetic anchor system consist a target magnet in vivo and a traction magnet in vitro. The non-contact traction and anchoring of the target can be achieved through the mechanical interaction of the anchor magnet and the traction magnet. This method not only can prevent the entanglement and collision between surgical instruments, but also can provide a good surgical field of vision for the surgical area, making the surgical process safer and more efficient. In this paper, 69 articles related to the application of magnetic anchor assist technology in surgical procedures were retrieved by conducting searches in the Chinese Journal Full-text Database(CNKI), Wanfang Database, VIP Chinese Sci-tech Journal Database, PubMed and other databases. After analysis and evaluation, a total of 36 papers were screened. The research progress and application status of magnetic anchor assist technology in combination with laparoscopy, thoracoscopy, and endoscopy in surgical operations were introduced. The results show that the magnetic anchor assist technology can greatly promote the development of minimally invasive surgery, but there are still problems in the application process, such as mutual interference of magnets and instability of the magnetic force, which still need to be further studied and improved.

The present study was performed to investigate the seroprevalence and risk factors for Dirofilaria immitis infection in cats from Liaoning province, northeastern China. From October 2014 to September 2016, sera of 651 cats, including 364 domestic cats and 287 feral cats (332 females and 319 males) were assessed. They were tested for the presence of D. immitis antigen using SNAP Heartworm RT test kit. In this population, the average prevalence was 4.5%. Age and rearing conditions (feral or domestic) were found to be associated with the prevalence of D. immitis. The prevalence was significantly higher in feral cats compared with domestic cats (8.4% vs 1.4%, P < 0.01). There was no significant difference between males and females (4.7% vs 4.2%, P>0.05), but older cats (≥3 years old) showed a statistically higher prevalence compared with younger cats ( < 3 years old) in feral populations (16.8 vs 2.4%, P < 0.01), while the difference between the age groups was not statistically significant in domestic cats (2.4% vs 0.51%, P>0.05), all these results suggest that outdoor exposure time may be one of the most important factors for D. immitis prevalence in cats. Results reveal that D. immitis are prevalence in domestic and feral cats in northeastern China, which indicates that appropriate preventive measures should be taken to decrease the incidence of feline heartworm disease in Liaoning province, northeastern China.
Animals ; Cats* ; China* ; Dirofilaria immitis* ; Dirofilaria* ; Dirofilariasis ; Female ; Humans ; Incidence ; Male ; Prevalence ; Risk Factors ; Seroepidemiologic Studies*

This study introduces a non-invasive gastrointestinal early cancer magnetic anchor ablation electrode endoscopy system, including a magnetic anchor module and ablation electrode module. The magnetic anchoring module is composed of an external guide magnet and an internal magnet, made of permanent magnet material NdFeB; the ablation electrode module is based on the modification of the front end lens hood of the existing endoscope (CMD-90D LED electronic upper gastrointestinal endoscope). The new endoscope system not only includes all the functions of the original endoscope, but also introduces magnetic anchoring to enable the ablation electrode to be accurately positioned and controllable in the process of treating tumors, avoiding the phenomenon of gastric perforation; the introduction of steep pulse electric field ablation electrodes realizes the purpose of non-invasive treatment. Its clinical application will become a new method to treat early cancer of the digestive tract.
Electrodes ; Endoscopes ; Gastrointestinal Tract ; Humans ; Magnetic Phenomena ; Neoplasms