Accuracy of a smartphone-assisted novel labeling method for marking target axial position in cataract surgery / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To evaluate the convenience and accuracy of a novel smartphone-assisted “any-point two-step method” for finding the target axial position in cataract phacoemulsification combined with intraocular lens(IOL)implantation.METHODS: Prospective observational study. A total of 62 cases(62 eyes)of patients with age-related cataracts who underwent cataract phacoemulsification combined with IOL implantation in our hospital from October 2021 to April 2022 were selected. They were randomly divided into two groups: 31 cases(31 eyes)in the control group were applied with the “traditional two-step method” using slit lamp to mark the target axial position of the IOL, and 31 cases(31 eyes)in the experimental group were applied with the smartphone-assisted “two-step method” to mark the target axial position of the IOL. The Callisto eye navigation system was used as a standard reference, and the deviation of the reference marking point(deviation-1), the deviation of the target axial marking point(deviation-total), and the deviation of the angle from the reference marking point to the target axial marking point(deviation-2)were calculated and recorded as the preoperative axial marking time.RESULTS:Both deviation-1 and deviation-total values were lower in the experimental group than those in the control group(1.06°±1.39° vs 2.48°±2.23°, 1.77°±1.54° vs 2.81°±1.58°, all P<0.01), but there was no significant difference in the deviation-2 values between the two groups(1.35°±1.40° vs 1.48°±1.79°, P>0.05). The preoperative axial marking took shorter time in the experimental group than in the control group(1.77±1.70 min vs 2.88±3.20 min, P<0.01).CONCLUSION: The smartphone-assisted “any-point two-step method” for finding the target axial position in cataract phacoemulsification combined with IOL implantation is simple, time-saving, and accurate compared with the “traditional two-step method”.

O-arm navigation versus C-arm navigation for guiding percutaneous long sacroiliac screws placement in treatment of Denis type Ⅱ sacral fractures / 中国修复重建外科杂志

OBJECTIVE@#To compare the effectiveness of O-arm navigation and C-arm navigation for guiding percutaneous long sacroiliac screws in treatment of Denis type Ⅱ sacral fractures.@*METHODS@#A retrospective study was conducted on clinical data of the 46 patients with Denis type Ⅱ sacral fractures between April 2021 and October 2022. Among them, 19 patients underwent O-arm navigation assisted percutaneous long sacroiliac screw fixation (O-arm navigation group), and 27 patients underwent C-arm navigation assisted percutaneous long sacroiliac screw fixation (C-arm navigation group). There was no significant difference in gender, age, causes of injuries, Tile classification of pelvic fractures, combined injury, the interval from injury to operation between the two groups ( P>0.05). The intraoperative preparation time, the placement time of each screw, the fluoroscopy time of each screw during placement, screw position accuracy, the quality of fracture reduction, and fracture healing time were recorded and compared, postoperative complications were observed. Pelvic function was evaluated by Majeed score at last follow-up.@*RESULTS@#All operations were completed successfully, and all incisions healed by first intention. Compared to the C-arm navigation group, the O-arm navigation group had shorter intraoperative preparation time, placement time of each screw, and fluoroscopy time, with significant differences ( P<0.05). There was no significant difference in screw position accuracy and the quality of fracture reduction ( P>0.05). There was no nerve or vascular injury during screw placed in the two groups. All patients in both groups were followed up, with the follow-up time of 6-21 months (mean, 12.0 months). Imaging re-examination showed that both groups achieved bony healing, and there was no significant difference in fracture healing time between the two groups ( P>0.05). During follow-up, there was no postoperative complications, such as screw loosening and breaking or loss of fracture reduction. At last follow-up, there was no significant difference in pelvic function between the two groups ( P>0.05).@*CONCLUSION@#Compared with the C-arm navigation, the O-arm navigation assisted percutaneous long sacroiliac screws for the treatment of Denis typeⅡsacral fractures can significantly shorten the intraoperative preparation time, screw placement time, and fluoroscopy time, improve the accuracy of screw placement, and obtain clearer navigation images.

O uso do planejamento virtual na cirurgia ortognática / The use of virtual planning in orthognathic surgery

Introdução: A cirurgia ortognática envolve manipulação da arquitetura óssea facial, através de osteotomias, para restaurar a forma e a função, corrigindo a má oclusão, as desproporções maxilomandibulares e assimetrias faciais. O planejamento virtual em cirurgia ortognática é realizado com ajuda de softwares que utilizam as medidas reais do esqueleto craniofacial e registros da oclusão do paciente, através de uma análise 3D. Método: Foram avaliados 18 pacientes com deformidades dentofaciais, de acordo com a classificação de Angle submetidos a cirurgia ortognática com o uso do planejamento virtual, entre 2018 e 2019. Os critérios de inclusão foram pacientes entre 16 e 60 anos com desproporções maxilo-mandibulares nas quais o tratamento ortodôntico isolado não era suficiente. Os critérios de exclusão foram a presença de lesões císticas ou tumorais nos maxilares e comorbidades clínicas que contraindicavam a cirurgia. O planejamento virtual foi realizado em todos os pacientes, utilizando o software Dolphin® Imaging 11 e os guias cirúrgicos confeccionados em impressora 3D. Resultados: O guia cirúrgico intermediário apresentou adaptação perfeita nas faces oclusais promovendo grande estabilidade para o reposicionamento e fixação da maxila na oclusão intermediária. Os 18 pacientes operados responderam como "totalmente satisfeitos" em relação ao resultado estético-funcional nessa série estudada. Foi encontrada uma semelhança muito grande da posição do esqueleto maxilofacial no planejamento virtual préoperatório e o obtido no pós-operatório, através da avaliação das telerradiografias. Conclusão: O planejamento virtual em cirurgia craniomaxilofacial possui inúmeras vantagens, como diminuição do tempo laboratorial pré-operatório, maior precisão na confecção dos guias cirúrgicos e melhor reprodutibilidade dos resultados simulados.

Introduction: Orthognathic surgery involves the manipulation of facial bone architecture through osteotomies to restore form and function, correcting malocclusion, maxillomandibular disproportions, and facial asymmetries. Virtual planning in orthognathic surgery is carried out with the help of software that uses real measurements of the craniofacial skeleton and records of the patient's occlusion through 3D analysis. Method: 18 patients with dentofacial deformities were evaluated, according to Angle's classification, who underwent orthognathic surgery using virtual planning between 2018 and 2019. The inclusion criteria were patients between 16 and 60 years old with maxylo-mandibular disproportions in which orthodontic treatment alone was not sufficient. Exclusion criteria were the presence of cystic or tumoral lesions in the jaw and clinical comorbidities that contraindicated surgery. Virtual planning was carried out on all patients, using Dolphin® Imaging 11 software and surgical guides made with a 3D printer. Results: The intermediate surgical guide presented perfect adaptation on the occlusal surfaces, promoting great stability for the repositioning and fixation of the maxilla in intermediate occlusion. The 18 operated patients responded as "completely satisfied" in relation to the aesthetic-functional result in this series studied. A very great similarity was found between the position of the maxillofacial skeleton in the preoperative virtual planning and that obtained post-operatively through the evaluation of teleradiography. Conclusion: Virtual planning in craniomaxillofacial surgery has numerous advantages, such as reduced pre-operative laboratory time, greater precision in the creation of surgical guides, and better reproducibility of simulated results.

Trajetória para implementação de programa de navegação de pacientes na oncologia: relato de experiência / The path to implementing a patient navigation program in oncology: an experience report

OBJETIVO: Descrever a trajetória para a implementação de um Programa de Navegação para pacientes oncológicos. MÉTODO: Estudo descritivo, tipo relato de experiência realizado em um Centro de Oncologia do Sul do Brasil. RESULTADOS: O processo de implementação da navegação ocorreu em quatro etapas: a primeira iniciou com implementação da navegação para pacientes privados com câncer de cabeça e pescoço; a segunda envolveu o piloto do programa de navegação de pacientes com câncer de mama para entender as principais barreiras enfrentadas pelas pacientes; a terceira etapa, foi elaborar e aprovar a Política do Programa de Navegação Institucional. Na última, o Programa de Navegação da linha de cuidado da mama foi implementado para pacientes com indicação de neoadjuvância. Obteve-se redução de 70% na mediana de tempo de indicação e primeira consulta oncológica, de 28,6% no tempo entre sintoma e diagnóstico, 26,0% no tempo entre diagnóstico e início de tratamento. CONCLUSÃO: A implementação de um Programa de Navegação para pacientes com câncer exige dedicação e comprometimento institucional onde se evidencia um melhor cuidado oncológico, tendo o enfermeiro como protagonista da gestão e efetivação do processo.

OBJECTIVE: To describe the process of implementing a Navigation Program for cancer patients. METHOD: Descriptive study, type of experience report carried out in an Oncology Center in Southern Brazil. RESULTS: The process of implementing navigation took place in four stages: the first began with the implementation of navigation for private patients with head and neck cancer; the second involved piloting the navigation program for breast cancer patients to understand the main barriers faced by patients; the third stage, was to draw up and approve the Institutional Navigation Program Policy. In the last stage, the Breast Care Navigation Program was implemented for patients with neoadjuvant indications. A 70% reduction was achieved in the median time between indication and first oncology consultation, 28.6% between symptom and diagnosis, and 26.0% between diagnosis and start of treatment. CONCLUSION: Implementing a Navigation Program for cancer patients requires dedication and institutional commitment, leading to better cancer care, with nurses playing a leading role in managing and implementing this process.

Private health plan operator: breast care navigation program and care line / Operadora de planes de salud privados: programa de navegación y línea de asistencia para el cuidado de las mamas / Operadora de plano de saúde privado: programa de navegação e linha de cuidado de atenção à mama

ABSTRACT Objective: to develop a navigation program for patients in the breast care line, beneficiaries of a private health plan operator. Method: a convergent care research study, related to the stages of the Guide for the Development and Implementation of Patient Navigation Programs, consisting of the phases: diagnosis; planning; implementation; and evaluation, using instruments specifically designed for each phase. It was conducted from January to September 2022 in Porto Alegre, Brazil. Results: during the diagnosis, the patients' demographic profile was identified and the flow they followed through the health services was analyzed. Interviews were carried out with the professionals involved in patient care, and the main barriers that might be faced by patients were surveyed. In planning, the program structure was considered. During implementation, a navigation pilot was carried out with two nurses from different areas; and the nurse navigators' performance profile and a proposal of topics for team training were constructed. An evaluation was carried out using the Plan, Do, Study and Act tool at the end of each stage. A breast care line and navigation program were created for the patients. Conclusion: two products were developed: Planned Care Line, with important prevention actions favoring screening and early diagnosis of the disease; and the Navigation Program for line assistance, in which attention is centered on the patients, with an evaluation of their needs, elimination of barriers that make it difficult for them to navigate the health system and guidance in each stage of the path.

RESUMEN Objetivo: desarrollar un programa de navegación para pacientes de la línea de asistencia para el cuidado de las mamas, en mujeres afiliadas a una operadora de planes de salud privados. Método: investigación convergente y asistencial, relacionada a las etapas propuestas en la Guía para el Desarrollo e Implementación de Programas de Navegación de Pacientes, compuesto por las siguientes fases: diagnóstico, planificación, implementación y evaluación, utilizando instrumentos elaborados específicamente para cada fase. El estudio se realizó entre enero y septiembre de 2022 en Porto Alegre, Brasil. Resultados: en el diagnóstico se identificó el perfil demográfico de las pacientes, al igual que se analizó el camino que recorrieron en los servicios de salud. Se realizaron entrevistas con los profesionales involucrados en atender a las pacientes, y se sondearon los principales obstáculos que podrían enfrentar las mujeres. En la planificación se contempló la estructura del programa. En la implementación se llevó a cabo una prueba piloto de navegación con dos enfermeras de distintas áreas, además de elaborarse el perfil de actuación de los enfermeros navegadores y una propuesta de temas para capacitar al equipo. Se realizó una evaluación con la herramienta Plan, Do, Study and Act al término de cada etapa. Se creó una línea de asistencia para el cuidado de las mamas y un programa de navegación para las pacientes. Conclusión: se desarrollaron dos productos: Línea de Asistencia Planificada, con importantes acciones de prevención que favorecen el screening y diagnóstico temprano de la enfermedad; y el Programa de Navegación para cumplir con la línea de asistencia, en el que la atención se centra en la paciente, evaluando sus necesidades, eliminando obstáculos que le dificultan transitar por el sistema de salud y orientándola en cada etapa del trayecto.

RESUMO Objetivo: Desenvolver um programa de navegação para pacientes da linha de cuidado de atenção à mama, beneficiárias de uma operadora de plano de saúde privado. Método: Pesquisa convergente assistencial, relacionada às etapas do Guia de Desenvolvimento e Implantação de Programas de Navegação de Pacientes, composto pelas fases: diagnóstico, planejamento, implantação e avaliação, utilizando instrumentos elaborados para cada fase. Foi realizada em Porto Alegre, Brasil, de janeiro a setembro de 2022. Resultados: No diagnóstico, identificou-se o perfil demográfico dos pacientes, análise do fluxo percorrido por eles nos serviços de saúde. Realizaram-se entrevistas com os profissionais envolvidos no atendimento ao paciente, e fez-se levantamento das principais barreiras que poderiam ser enfrentadas por ele. No planejamento, contemplou-se a estrutura do programa. Na implantação, realizou-se piloto de navegação com duas enfermeiras de áreas distintas; e construíram-se o perfil de atuação do enfermeiro navegador e uma proposta de temas para capacitação da equipe. Realizou-se avaliação com a ferramenta Plan, Do, Study and Act ao término de cada etapa. Construíram-se às pacientes, linha de cuidado de atenção à mama e o programa de navegação. Conclusão: Desenvolveram-se dois produtos: Linha de Cuidado Planejada, com ações importantes de prevenção favorecendo o rastreamento e diagnóstico precoce da doença; e o Programa de Navegação para atendimento à linha, em que a atenção é centrada no paciente, com avaliação de suas necessidades, eliminação de barreiras que lhe dificultam trafegar no sistema de saúde e seu direcionamento em cada etapa da jornada.

Experience of care nurses: approaches to the principles of navigation of cancer patients / Experiencia de enfermeros de cuidado: aproximaciones a los principios de navegación de pacientes con cáncer / Experiência de enfermeiras assistenciais: aproximações aos princípios da navegação de pacientes oncológicos

ABSTRACT Objective: To understand the experiences of nurses assisting cancer patients, according to Harold Freeman´s principles of navigation. Method: A qualitative study conducted in a large public hospital in the State of São Paulo in December 2021. Six nurses were interviewed using a semi-structured script with questions about the care of cancer patients and their families. The data were submitted to content analysis with theoretical framework of Harold Freeman. Results: Five categories emerged from the statements: fluidity in care; integration between teams; bond with patients and families; competencies of care nurses in the navigation of cancer patients; valorization and facilities in team training. Conclusion: According to the categories observed, we can consider that the experiences of care nurses working in an oncology unit revealed the strengthening of navigation principles contributing to the care and minimization of barriers, which can facilitate and/or soften the therapeutic path of the cancer patient.

RESUMEN Objetivo: Comprender las experiencias de enfermeros que asisten a pacientes con cáncer, según los principios de navegación de Harold Freeman. Método: Estudio cualitativo realizado en un gran hospital público del Estado de São Paulo en diciembre de 2021. Seis enfermeros fueron entrevistados utilizando un guión semiestructurado con preguntas sobre el cuidado de pacientes con cáncer y sus familias. Los datos fueron sometidos al análisis de contenido con el referencial teórico de Harold Freeman. Resultados: De los enunciados surgieron cinco categorías: fluidez en el cuidado; integración entre equipos; vínculo con pacientes y familias; competencias de los enfermeros asistenciales en la navegación de pacientes oncológicos; valoración y facilidades en la formación de equipos. Conclusión: De acuerdo con las categorías observadas, podemos considerar que las experiencias de los enfermeros asistenciales que actúan en una unidad de oncología revelaron el fortalecimiento de los principios de navegación contribuyendo al cuidado y minimización de barreras, lo que puede facilitar y/o suavizar el camino terapéutico del cáncer paciente.

RESUMO Objetivo: Compreender as experiências de enfermeiras assistenciais aos pacientes oncológicos, segundo os princípios da navegação de Harold Freeman. Método: Estudo de abordagem qualitativa, realizado em hospital público de grande porte no interior do Estado de São Paulo no mês de dezembro de 2021. Foram entrevistadas seis enfermeiras por meio de roteiro semiestruturado com questões acerca do atendimento ao paciente oncológico e familiares. Os dados foram submetidos à análise de análise de conteúdo com referencial teórico de Harold Freeman. Resultados: Cinco categorias emergiram dos depoimentos: fluidez na assistência; integração entre as equipes; vínculo com pacientes e familiares; competências das enfermeiras assistenciais na navegação de pacientes oncológicos; valorização e facilidades no treinamento das equipes. Conclusão: De acordo com as categorias observadas, podemos considerar que as experiências de enfermeiras assistenciais que atuam em unidade oncológica revelaram o fortalecimento dos princípios de navegação contribuindo para o atendimento e minimização de barreiras, o que pode facilitar e/ou suavizar o trajeto terapêutico do paciente oncológico.

Floor Maze Test is capable of differentiating spatial navigation between frail and pre-frail institutionalized older persons / Floor Maze Test é capaz de diferenciar a navegação espacial entre idosos institucionalizados frágeis e pré-frágeis

ABSTRACT. Investigation of the association between physical frailty and cognitive performance through spatial navigation is important to enable the identification of individuals with cognitive impairment and physical comorbidity. Objective: To analyze the association between spatial navigation and frailty in frail and pre-frail institutionalized older adults. Methods: Forty older people of both sexes, aged 60 years or over, residing in four Brazilian Long-Term Care Facilities (LTCFs) participated in this study. The following tests were applied: Mini-Mental State Examination (MMSE), 2.44m Timed Up and Go, Floor Maze Test (FMT), and Fried's frailty criteria. For data analysis, the Mann-Whitney and independent t-tests were used to compare the groups (frail x pre-frail), principal component analysis was used to explore the main variables related to the data variance, and binary logistic regression to estimate associations. Results: There was a significant difference in performance in the FMT immediate maze time (IMT) (p=0.02) and in the delayed maze time (DMT) (p=0.009) between the pre-frail and frail older adults. An association between FMT DMT performance and frailty was found, showing that older people with shorter times on the DMT (better performance) had approximately four times the chance of not being frail (odds ratio - OR=4.219, 95% confidence interval - 95%CI 1.084-16.426, p=0.038). Conclusion: Frailty is associated with impaired spatial navigation ability in institutionalized older adults, regardless of gait speed performance.

RESUMO. A investigação da associação entre fragilidade física e desempenho cognitivo por meio da navegação espacial é importante para possibilitar a identificação de indivíduos com déficit cognitivo e comorbidade física. Objetivo: Analisar a associação entre navegação espacial e fragilidade em idosos institucionalizados frágeis e pré-frágeis. Métodos: Participaram deste estudo 40 idosos de ambos os sexos, com idade igual ou superior a 60 anos, residentes em quatro instituições de longa permanência (ILPI) brasileiras. Foram aplicados os seguintes testes: Miniexame do Estado Mental (MEEM), 2,44m Timed Up and Go, Floor Maze Test (FMT) e os critérios de fragilidade de Fried. Para a análise dos dados, foram utilizados os testes t independente e de Mann-Whitney para comparar os grupos (frágeis x pré-frágeis), foi feita análise de componentes principais para explorar as principais variáveis relacionadas à variância dos dados e regressão logística binária para estimar associações. Resultados: Houve diferença significativa no desempenho do FMT no tempo imediato do labirinto (TIL) (p=0,02) e no tempo posterior do labirinto (TPL) (p=0,009) entre os idosos pré-frágeis e frágeis. Encontrou-se associação entre o desempenho no FMT TPL e fragilidade, mostrando que idosos com menor tempo de TPL (melhor desempenho) tiveram aproximadamente quatro vezes mais chance de não serem frágeis (odds ratio - OR=4,219, intervalo de confiança de 95% - IC95% 1,084-16,426, p=0,038). Conclusão: A fragilidade está associada à habilidade de navegação espacial prejudicada em idosos institucionalizados, independentemente do desempenho da velocidade da marcha.

Automatic extraction of point cloud on cartilage surface of intraoperative knee using FPFH-PointNet / 解剖学报

Objective The navigation system of robot-assisted knee arthroplasty uses a laser scanner to acquire intraoperative cartilage point clouds and align them with the preoperative model for automatic non-contact space registration. The intraoperative patient knee lesion point cloud contains a large number of irrelevant background point clouds of muscles, tendons, ligaments and surgical instruments. Manual removal of irrelevant point clouds takes up surgery time due to human-computer interaction, so in this study we proposed a novel method for automatic extraction of point clouds from the knee cartilage surface for fast and accurate intraoperative registration. Methods Due to the lack of adequate description of cartilage surface and geometric local information, PointNet cannot extract cartilage point clouds with high precision. In this paper, a fast point feature histogram(FPFH)-PointNet method combined with fast point feature histogram was proposed, which effectively described the appearance of cartilage point cloud and achieved the automatic and efficient segmentation of cartilage point cloud. Results The point clouds of distal femoral cartilage of 10 cadaveric knee specimens and 1 human leg model were scanned from different directions as data sets. The accuracy of cartilage point cloud segmentation by PointNet and FPFH-PointNet were 0.94 ±0.003 and 0.98 ±0, and mean intersection over union(mIOU) were 0.83 ±0.015 and 0.93 ±0.005, respectively. Compared with PointNet, FPFH-PointNet improved accuracy and mIOU by 4% and 10% respectively, while the elapsed time was only about 1.37 s. Conclusion FPFH-PointNet can accurately and automatically extract the knee cartilage point cloud, which meets the performance requirement for intraoperative navigation.

Application of multimodal electromagnetic navigation in endoscopic endonasal skull base anatomical measurement of fresh cadavers / 解剖学报

Objective Electromagnetic navigation was used to observe and measure important anatomical structures through endoscopic endoscopic approach (EEA) to the ventral skull base to provide data for clinical surgery. Methods Using electromagnetic navigation to measure the anatomical structure of the central and paracentral ventral skull base on 10 fresh cadavers, the internal carotid artery (ICA) was the most important. Results Electromagnetic navigation helped to determine the course of important neurovascular. The ICA of the ventral skull base was divided into 5 segments+ 7 major branches, and the length and course of each were measured and recorded. Conclusion The identification and protection of ICA is the key to EEA treatment of ventral skull base lesions, and electromagnetic navigation assistance can improve the efficiency and safety of EEA surgery.

Application of computer-assisted navigation technology in the resection and reconstruction of mandibular ameloblastoma / 口腔医学

Objective@# Using computer-assisted navigation technology to guide the resection and reconstruction of mandibular ameloblastoma, evaluating its treatment effect.@*Methods @# Twelve patients were selected from the Affiliated Stomatological Hospital of Nanjing University from January 2017 to May 2022. All 12 patients accepted same surgery which included resection of mandibular ameloblastoma and reconstruction by fibula musculocutaneous flap. Among them, 6 cases were included in the navigation group; 6 cases were in the non-navigation group. Advantages and disadvantages of computer-assisted navigation technology in this operation were evaluated with these cases. @*Results@# The 12 operations were performed by the same operator. The average time for fixing the navigation bracket and performing navigation in the navigation group was about 15 minutes. Compared with the non-navigation group, the average operation time in the navigation group was shortened by about 10 minutes. In the navigation group, the mandible resection range matched the fibula musculocutaneous flap well, and the occlusal relationship recovered well. @*Conclusion @#Using the mandibular reference frame, under the guidance of computer-assisted navigation technology, the resection and reconstruction of mandibular ameloblastoma can be performed quickly and accurately.

Research Progress in the Application of Ultrasound-Guided Robot in Minimally Invasive Surgery / 中国医学科学院学报

With the continuous advances in modern medical technology and equipment,minimally invasive surgery (MIS) is widely applied in clinical practice.Ultrasound (US) as a real-time,portable,and radiation-free medical imaging method can be used for the intraoperative guidance in MIS to ensure safe and effective surgery.However,the physical characteristics of conventional US fail to display some tissue structures of the human body due to the existence of gas and bone.US-based navigation can make up for the deficiencies by advanced imaging technologies including spatial orientation,image reconstruction,and multi-modality image fusion,being real-time,accurate,and radiation-free.Therefore,US-guided robots can achieve safe,effective,and minimally invasive operation in MIS.This paper reviews the studies of US-guided robots in MIS and prospects the development of this field.

Electromagnetic navigation bronchoscopy-guided preoperative localization of pulmonary nodules in 183 patients: A clinical analysis in a single center / 中国胸心血管外科临床杂志

@#Objective    To investigate the clinical efficacy of preoperative location of pulmonary nodules guided by electromagnetic navigation bronchoscopy (ENB). Methods    Patients who received preoperative ENB localization and then underwent surgery from March 2021 to November 2022 in the Department of Thoracic Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine were collected. The clinical efficacy and safety of ENB localization and the related factors that may affect the success of ENB localization were analyzed. Results    Initially 200 patients were included, among whom 17 undergoing preoperative localization and biopsy were excluded and a total of 183 patients and 230 nodules were finally included. There were 62 males and 121 females with a mean age of 49.16±12.50 years. The success rate of navigation was 88.7%, and the success rate of ENB localization was 67.4%. The rate of complications related to ENB localization were 2.7%, and the median localization time was 10 (7, 15) min. Multi-variable analysis showed that factors related to successful localization included distance from localization site (OR=0.27, 95%CI 0.13-0.59, P=0.001), staining material (OR=0.40, 95%CI 0.17-0.95, P=0.038), and staining dose (OR=60.39, 95%CI 2.31-1 578.47, P=0.014). Conclusion     ENB-guided preoperative localization of pulmonary nodules is safe and effective, and the incidence of complications is low, which can be used to effectively assist the diagnosis and treatment of early lung cancer.

Medical micro- and nanomotors in the body

Attributed to the miniaturized body size and active mobility, micro- and nanomotors (MNMs) have demonstrated tremendous potential for medical applications. However, from bench to bedside, massive efforts are needed to address critical issues, such as cost-effective fabrication, on-demand integration of multiple functions, biocompatibility, biodegradability, controlled propulsion and in vivo navigation. Herein, we summarize the advances of biomedical MNMs reported in the past two decades, with particular emphasis on the design, fabrication, propulsion, navigation, and the abilities of biological barriers penetration, biosensing, diagnosis, minimally invasive surgery and targeted cargo delivery. Future perspectives and challenges are discussed as well. This review can lay the foundation for the future direction of medical MNMs, pushing one step forward on the road to achieving practical theranostics using MNMs.

Neural Correlates of Spatial Navigation in Primate Hippocampus / 神经科学通报·英文版

The hippocampus has been extensively implicated in spatial navigation in rodents and more recently in bats. Numerous studies have revealed that various kinds of spatial information are encoded across hippocampal regions. In contrast, investigations of spatial behavioral correlates in the primate hippocampus are scarce and have been mostly limited to head-restrained subjects during virtual navigation. However, recent advances made in freely-moving primates suggest marked differences in spatial representations from rodents, albeit some similarities. Here, we review empirical studies examining the neural correlates of spatial navigation in the primate (including human) hippocampus at the levels of local field potentials and single units. The lower frequency theta oscillations are often intermittent. Single neuron responses are highly mixed and task-dependent. We also discuss neuronal selectivity in the eye and head coordinates. Finally, we propose that future studies should focus on investigating both intrinsic and extrinsic population activity and examining spatial coding properties in large-scale hippocampal-neocortical networks across tasks.

Application of extended reality technology for real-time navigation in clinical operation / 南方医科大学学报

OBJECTIVE@#To explore the application of extended reality (XR) technology in clinical surgeries for improving the success rate of surgeries.@*METHODS@#To assist the surgeons to better understand the location, size and geometric shape of the lesions and reduce potential radiation exposure in minimally invasive surgical navigation based on two-dimensional images, we constructed three-dimensional models based on CT data and used XR technology to achieve intraoperative navigation. An improved quaternion method was used to improve the accuracy of electromagnetic positioning, with which the system error of positioning accuracy was reduced to below 2 mm. A 5G network was used to optimize the server GPU programming algorithm, and real-time video stream coding strategy and network design were adopted to reduce data transmission jam and delay in the remote surgery network, which achieved an average delay of less than 60 ms. A Gaussian distribution deformation model was used to simulate collision detection and stress deformation of the tissues to achieve a tactile perception effect.@*RESULTS AND CONCLUSION@#The intraoperative navigation system based on XR technology allowed more accurate determination of the location of the lesions, effectively reduced the surgical risk, and avoided the risk of intraoperative radiation exposure. The low latency and high fidelity of 5G network achieved real-time interaction during the surgery to provide a technical basis for multi-terminal remote cooperative surgery. The combination of force feedback technology and XR technology enables the surgeons to conduct deep immersion preoperative planning and virtual surgery to improve the success rate of surgery and shorten the learning curve.

Application and Progress of Digital Navigation Technology in Micro-apical Surgery / 中国医疗器械杂志

As imaging technology develops rapidly, dynamic and static guided technology is widely used in many medical fields now. In order to improve the success rate, reduce surgical complications and improve future prognosis, domestic and foreign experts have introduced digital navigation technology into apical surgery. With the help of digital navigation technology, apical lesions can be easily located and the scope of osteotomy can be limited, which can make the surgery be completed accurately, especially in complex clinical cases. This study overviews the clinical use and research progress of dynamic and static guided technology in apical surgery, summarizes the advantages and disadvantages of this technique as well as looks forward to its future.

Research on the Application of Electromagnetic Navigation Technology in Surgical Robots / 中国医疗器械杂志

Due to the need to achieve precise operations during surgery, in order to prevent hand tremors and poor surgical field of view, more and more surgical robots are used in surgical operations combined with navigation technology to meet the requirements for surgical accuracy. Open surgery such as orthopaedics, joint replacement and neurosurgery on the market generally use optical navigation systems to guide robots to achieve precise positioning, but optical navigation systems cannot be used for operations in areas with small surgical space. Therefore, a robotic surgical system based on electromagnetic navigation technology that can be applied to the craniofacial area was proposed. By using this robot, the problems of difficult operation and low precision caused by the narrow craniofacial space can be solved. Key techniques and considerations are studied. The function of the developed prototype is verified through model tests. The test results show that the surgical robot under the electromagnetic navigation technology can achieve precise surgical operations improve the success rate of the doctor's surgery and reduce postoperative complications.

A Novel Robotic Bronchoscopic Surgical System / 中国医疗器械杂志

Transbronchil biopsy has the characteristic of less trauma and quick recovery compared to percutaneous aspiration biopsy. In order to automate this procedure, it requires the development of a robotic surgical system that combines electromagnetic navigation and flexible endoscope. The robotic surgical system introduced herein consists of flexible endoscope, remote-control handle, electromagnetic navigation and dexterous manipulators. The robotic system supports lung bronchial model segmentation and reconstruction, automatic bronchial path planning, real-time navigation and visual biopsy. In the control of the endoscopic catheter, an elasticity compensation algorithm was proposed to improve the location accuracy of the catheter and operational efficiency. Clinical trials proved that the robotic system had high positioning accuracy, was intuitive to operate, and could improve the biopsy efficiency, shorten the learning time, reduce the burden of surgical operations, and lower radiation exposure and infection rate.

Diagnostic Value and Safety of Electromagnetic Navigation Bronchoscopy in Peripheral Pulmonary Lesions: A Meta-analysis / 中国肺癌杂志

BACKGROUND@#The incidence and mortality of lung cancer have always been at the forefront of malignant tumors. With the development of lung cancer detection techniques, more peripheral pulmonary lesions (PPLs) have been detected. The diagnostic accuracy of procedures for PPLs keeps controversial. This study aims to systematically evaluate the diagnostic value and the safety of electromagnetic navigation bronchoscopy (ENB) in the diagnosis of PPLs.@*METHODS@#The relevant literatures in the diagnostic yield of PPLs by ENB were systematically retrieved from Wanfang Data Knowledge Service Platform, China National Knowledge Infrastructure, Embase, PubMed, Cochrane Library and Web of Science. The software of Stata 16.0, RevMan 5.4 and Meta-disc 1.4 were used to conduct the meta-analysis.@*RESULTS@#A total of 54 literatures with 55 studies were included in our meta-analysis. The pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio and diagnostic odds ratio of ENB in the diagnosis of PPLs were 0.77 (95%CI: 0.73-0.81), 0.97 (95%CI: 0.93-0.99), 24.27 (95%CI: 10.21-57.67), 0.23 (95%CI: 0.19-0.28) and 104.19 (95%CI: 41.85-259.37), respectively. The area under curve (AUC) was 0.90 (95%CI: 0.87-0.92). Meta-regression and subgroup analyses indicated that the potential heterogeneity resulted from study type, additional localization techniques, sample size, lesion size and type of sedation. The use of additional localization techniques and general anesthesia have improved the diagnostic efficiency of ENB in PPLs. The incidence of adverse reactions and complications associated with ENB was very low.@*CONCLUSIONS@#ENB provides well diagnostic accuracy and safety.

O-arm real-time guidance in cervical pedicle screw fixation / 中国骨伤

OBJECTIVE@#To explore the technical aspects of the accuracy of cervical pedicle screw placement with O-arm guidance.@*METHODS@#The clinical data of 21 patients who underwent cervical pedicle screw fixation by O-arm real-time guidance from December 2015 to January 2020 were analyzed retrospectively. There were 15 males and 6 females, aged from 29 to 76 years old with an average of (45.3±11.5) years. The postoperative CT scan was utilized to evaluate the placement of the pedicle screw and classified according to the Gertzbein and Robbins classification.@*RESULTS@#A total of 132 pedicle screws were implanted in 21 patients, 116 at C3-C6 and 16 at C1 and C2. According to Gertzbein & Robbins classification, the overall breach rates were found to be 11.36% (15/132) with 73.33% (11 screws) Grade B, 26.67% (4 screws) Grade C, and no Grade D or E screw breaches. There were no pedicle screw placement related complications at final follow-up.@*CONCLUSION@#The application of O-arm real-time guidance technology can make cervical pedicle screw placement reliable. High accuracy and better intra-operative control can increase surgeon's confidence in using cervical pedicle instrumentation. Considering the high-risk nature of anatomical area around cervical pedicle and the possibility of catastrophic complications, the spine surgeon should have sufficient surgical skills, experience, ensures stringent verification of the system, and never relies solely on the navigation system.