J Shanghai Jiaotong Univ Sci

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    Visualization System for Closed Thoracic Drainage Puncture Based on Augmented Reality and Ultrafine Diameter Camera
    Qin Wei, Wang Shuyi, Chen Xueyu, Zhuang Yiwei, Shen Yichun, Shen Yuhán
    J Shanghai Jiaotong Univ Sci    2025, 30 (3): 417-424.   DOI: 10.1007/s12204-025-2808-6
    Abstract （73）      PDF（pc） （1524KB）（25）       Save
    Closed thoracic drainage can be performed using a steel-needle-guided chest tube to treat pleural effusion or pneumothorax in clinics. However, the puncture procedure during surgery is invisible, increasing the risk of surgical failure. Therefore, it is necessary to design a visualization system for closed thoracic drainage. Augmented reality (AR) technology can assist in visualizing the internal anatomical structure and determining the insertion point on the body surface. The structure of the currently used steel-needle-guided chest tube was modified by integrating it with an ultrafine diameter camera to provide real-time visualization of the puncture process. After simulation experiments, the overall registration error of the AR method was measured to be within (3.59±0.53) mm, indicating its potential for clinical application. The ultrafine diameter camera module and improved steel-needle-guided chest tube can timely reflect the position of the needle tip in the human body. A comparative experiment showed that video guidance could improve the safety of the puncture process compared to the traditional method. Finally, a qualitative evaluation of the usability of the system was conducted through a questionnaire. This system facilitates the visualization of closed thoracic drainage puncture procedure and provides an implementation scheme to enhance the accuracy and safety of the operative step, which is conducive to reducing the learning curve and improving the proficiency of the doctors.
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    Optimization of Wireless Power Receiving Coil for Near-Infrared Capsule Robot
    Wang Wei, Zhou Cheng, Jiang Jinlei, Cui Xinyuan, Yan Guozheng, Cui Daxiang
    J Shanghai Jiaotong Univ Sci    2025, 30 (3): 425-432.   DOI: 10.1007/s12204-024-2717-0
    Abstract （48）      PDF（pc） （1554KB）（13）       Save
    An optimizing method for designing the wireless power receiving coil (RC) is proposed in this paper to address issues such as insufficient and fluctuating power supply in the near-infrared capsule robot. An electromagnetic and circuit analysis is conducted to establish the magnetic induction intensity and equivalent circuit models for the wireless power transmission system. Combining these models involves using the number of layers in each dimension as the optimization variable. Constraints are imposed based on the normalized standard deviation of the receiving-end load power and spatial dimensions. At the same time, the optimization objective aims to maximize the average power of the receiving-end load. This process leads to formulating an optimization model for the RC. Finally, three-dimensional RCs with three different sets of parameters are wound, and the receiving-end load power of these coils is experimentally tested under various drive currents. The experimental values of the receiving-end load power exhibit a consistent trend with theoretical values, with experimental values consistently lower than theoretical values. The optimized coil parameters are determined by conducting comparative experiments, with a theoretical value of 4.6% for the normalized standard deviation of the receiving-end load power and an average experimental value of 9.6%. The study addressed the power supply issue of near-infrared capsule robots, which is important for early diagnosing and treating gastrointestinal diseases.
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    Mechanical and Permeability Properties of Radial-Gradient Bone Scaffolds Developed by Voronoi Tessellation for Bone Tissue Engineering
    Xu Qingyu, Hai Jizhe, Shan Chunlong, Li Haijie
    J Shanghai Jiaotong Univ Sci    2025, 30 (3): 433-445.   DOI: 10.1007/s12204-024-2770-8
    Abstract （62）      PDF（pc） （4136KB）（16）       Save
    Irregular bone scaffolds fabricated using the Voronoi tessellation method resemble the morphology and properties of human cancellous bones. This has become a prominent topic in bone tissue engineering research in recent years. However, studies on the radial-gradient design of irregular bionic scaffolds are limited. Therefore, this study aims to develop a radial-gradient structure similar to that of natural long bones, enhancing the development of bionic bone scaffolds. A novel gradient method was adopted to maintain constant porosity, control the seed sitespecific distribution within the irregular porous structure, and vary the strut diameter to generate radial gradients. The irregular scaffolds were compared with four conventional scaffolds (cube, pillar BCC, vintiles, and diamond) in terms of permeability, stress concentration characteristics, and mechanical properties. The results indicate that the radial-gradient irregular porous structure boasts the widest permeability range and superior stress distribution compared to conventional scaffolds. With an elastic modulus ranging from 4.20 GPa to 22.96 GPa and a yield strength between 68.37 MPa and 149.40 MPa, it meets bone implant performance requirements and demonstrates significant application potential.
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