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  1. Article ; Online: Clinical Study of Wrist Arthroscopy Combined with Oblique Ulnar Shortening Osteotomy in the Treatment of Ulnar Impaction Syndrome.

    Lu, Chengyin / Wang, Pengtao / Zhang, Laifu / Dong, Jiahe / Zhang, Hailong / Yang, Lei / Wang, Xiaohui / Xiong, Hui

    Orthopaedic surgery

    2022  Volume 14, Issue 11, Page(s) 2947–2954

    Abstract: Objective: To explore the clinical effects of wrist arthroscopy combined with oblique ulnar shortening osteotomy in the treatment of ulnar impaction syndrome.: Methods: This was a retrospective study of 60 patients with ulnar impaction syndrome who ... ...

    Abstract Objective: To explore the clinical effects of wrist arthroscopy combined with oblique ulnar shortening osteotomy in the treatment of ulnar impaction syndrome.
    Methods: This was a retrospective study of 60 patients with ulnar impaction syndrome who were admitted to our department from January 2016 to December 2019. According to different surgical methods, they were divided into an observation group and a control group, with 30 cases in each group. The control group was treated with oblique ulnar shortening osteotomy, and the observation group used wrist arthroscopy based on the control group. The two groups of patients were compared in terms of wrist function before and 12 months after surgery. We compared the Disabilities of the Arm, Shoulder, and Hand Score (DASH Score), Patient-Rated Wrist Evaluation Score (PRWE Score), Visual Analog Score (VAS), and ulnar variation between the two groups at 12 months after surgery. The excellent and good rates by Mayo wrist score were compared between the two groups at the last follow-up.
    Results: All patients were followed up for 12-36 months, with an average of 14.5 months. Bone union was achieved at the oblique osteotomy of the ulna, with an average healing time of 13.6 weeks. The observation group was examined by wrist arthroscopy, and the triangular fibrocartilage complex (TFCC) Palmer classification was confirmed in three cases of type IIA, seven cases of type IIB, 14 cases of type IIC, and six cases of type IID. Compared with before surgery, the grip strength, flexion-extension, ulnar radial deflection, and forearm rotation of the two groups of patients were significantly improved at 12 months after surgery. The DASH score, PRWE score, and VAS score of the observation group were better than those of the control group, and the difference in ulnar shortening length was not statistically significant between the two groups. The excellent and good rates of the observation group (93.3%) were better than those of the control group (87.5%) at the last follow-up, and the difference was statistically significant.
    Conclusion: Compared with oblique ulnar shortening osteotomy alone, combined wrist arthroscopy can better reduce the pain of patients with ulnar impaction syndrome, restore wrist function, and improve the excellent and good rates. Therefore, it is clinically worthy of promotion.
    MeSH term(s) Humans ; Arthroscopy/methods ; Retrospective Studies ; Wrist ; Range of Motion, Articular ; Treatment Outcome ; Osteotomy/methods ; Joint Diseases/surgery
    Language English
    Publishing date 2022-09-30
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2503162-4
    ISSN 1757-7861 ; 1757-7853 ; 1757-7861
    ISSN (online) 1757-7861 ; 1757-7853
    ISSN 1757-7861
    DOI 10.1111/os.13428
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Optimization of Surface Acoustic Wave Resonators on 42°Y-X LiTaO

    Pan, Hongzhi / Yang, Yang / Li, Lingqi / Zhang, Qiaozhen / Zheng, Zeyu / Du, Xuesong / Chen, Pingjing / Dong, Jiahe / Lu, Chuan / Xie, Xiao / Li, Hualin / Xiao, Qiang / Ma, Jinyi / Chen, Zhenglin

    Micromachines

    2023  Volume 15, Issue 1

    Abstract: SAW devices with a multi-layered piezoelectric substrate have excellent performance due to advantages such as a high quality factor, ...

    Abstract SAW devices with a multi-layered piezoelectric substrate have excellent performance due to advantages such as a high quality factor,
    Language English
    Publishing date 2023-12-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi15010012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Periodic Analysis of Surface Acoustic Wave Resonator with Dimensionally Reduced PDE Model Using COMSOL Code.

    Zhang, Qiaozhen / Chen, Zhenglin / Chen, Yanguang / Dong, Jiahe / Tang, Panliang / Fu, Sulei / Wu, Haodong / Ma, Jinyi / Zhao, Xiangyong

    Micromachines

    2021  Volume 12, Issue 2

    Abstract: Radio-frequency (RF) surface acoustic wave (SAW) resonators used as filters and duplexers are mass-produced and widely used in current mobile phones. With the numerous emergences of the diverse device structure, a universal method used for the accurate ... ...

    Abstract Radio-frequency (RF) surface acoustic wave (SAW) resonators used as filters and duplexers are mass-produced and widely used in current mobile phones. With the numerous emergences of the diverse device structure, a universal method used for the accurate and fast simulation of the SAW resonator calls for urgent demand. However, there are too many instances where the behavior of the entire acoustic resonator cannot be characterized rapidly and efficiently due to limitations in the current computer memory and speed. This is especially true for SAW resonators configured with long arrays of inter-digital transducers (IDTs), and we have to resort to a periodic analysis. In this paper, the previously reported generalized partial differential equations (PDE) based on the two-dimensional finite element method (2D-FEM) model is extended to analysis for the periodic structure of the SAW resonator. We present model order reduction (MOR) techniques based on FEM and periodic boundary conditions to achieve a dimensionally reduced PDE model without decreasing the accuracy of computations. Examples of different SAW devices, including the regular SAW, IHP-SAW and TC-SAW resonators, are provided which shows the results of the periodic analysis compared with the experimental results of the actual resonators. The investigation results demonstrate the properties of the proposed methodology and prove its effectiveness and accuracy.
    Language English
    Publishing date 2021-01-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi12020141
    Database MEDical Literature Analysis and Retrieval System OnLINE

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