Simulation Results and Analysis of Electric Field Distribution in Myocardial Tissue under Circular Electrode Electric Pulse Ablation / 中国医疗器械杂志

As a new energy source for atrial fibrillation ablation, electric pulse ablation has higher tissue selectivity and biosafety, so it has a great application prospect. At present, there is very limited research on multi-electrode simulated ablation of histological electrical pulse. In this study, a circular multi-electrode ablation model of pulmonary vein will be built on COMSOL5.5 platform for simulation research. The results show that when the voltage amplitude reaches about 900 V, it can make some positions achieve transmural ablation, and the depth of continuous ablation area formed can reach 3 mm when the voltage amplitude reaches 1 200 V. When the distance between catheter electrode and myocardial tissue is increased to 2 mm, a voltage of at least 2 000 V is required to make the depth of continuous ablation area reach 3 mm. Through the simulation of electric pulse ablation with ring electrode, the research results of this project can provide reference for the voltage selection in the clinical application of electric pulse ablation.

CT Image-based Surgery Assist System for Left Atrial Appendage Occlusion / 中国医疗器械杂志

At present, the standard left atrial appendage occlusion procedure mainly involves two-dimensional imaging methods such as X-ray fluoroscopy and transesophageal echocardiography to guide the operation, which will lead to underestimation of the three dimensional structure of the left atrial appendage and the surrounding tissue, thus adversely affects the surgery. To solve this problem, a surgery assist system for left atrial appendage occlusion based on preoperative cardiac CT images is developed. The proposed system realizes the left atrial appendage parameter measurement based on cardiac CT image, and realizes the calculation of optimal delivery sheath trajectory and three-dimensional simulation of the delivery sheath movement on the basis of a novel delivery sheath trajectory model. The system is expected to provide precise guidance for left atrial appendage occlusion, improve the success rate and safety of the operation, and at the same time help reduce the difficulty of learning the operation, and facilitate the promotion of left atrial appendage occlusion.

Auditory guidance systems for the visually impaired people / 生物医学工程学杂志

Visually impaired people face many inconveniences because of the loss of vision. Therefore, scientists are trying to design various guidance systems for improving the lives of the blind. Based on sensory substitution, auditory guidance has become an interesting topic in the field of biomedical engineering. In this paper, we made a state-of-technique review of the auditory guidance system. Although there have been many technical challenges, the auditory guidance system would be a useful alternative for the visually impaired people.

Study and Design of Broad -spectrum (1100nm～1800nm) Infrared Light -Based Skin Rejuvenation System / 中国医学物理学杂志

Objective: Compare merits and drawbacks of existing ablative and non-ablative rejuvenation technologies, and complete study and design of a skin rejuvenation device based on a new rejuvenation mechanism using broad-spectrum infrared light (1100 nm ～1800nm). Methods: This article firstly presents skin rejuvenation mechanism based on the broad-spectrum infrared light, and then independently design by using corresponding systems at home and abroad for reference to make a high-quality device with lower costs compared to international corresponding systems. The device has a modular architecture design including system control module, power module, infrared emission, human machine interface, water circulating cooling and switch control module. The article details three key points in design: how to generate the required infrared pulsed light, human machine interface and anti-interference design. Results: The article gave the architecture diagram and human machine interface. The technical parameters measured by experiments satisfied the design requirements and the device can be used in clinics. Its stability, reliability and energy uniformity all meet requirements of infrared rejuvenation treatment. Conclusion: The device will have good applying prospect and market prospect in medical cosmetics.