One-stage vs. two-stage adjustable sutures for the correction of esotropia

BACKGROUND The aim of this study was to evaluate the stability and the level of postoperative consciousness, nausea and vomiting, ocular pain, starting oral intake and activity, and cost-effectiveness in patients undergoing medial rectus recession surgery using an adjustable suture technique that was performed by two different methods. METHOD In this prospective study, we evaluated 78 patients undergoing medial rectus recession surgery. Thirty-eight patients were operated by a one-stage technique in which the whole operation was done under topical anesthesia and adjustment was done on the operating table, while 40 patients were operated by a two-stage technique in which the operation was done under general anesthesia and adjustment was done the following day at the patient’s bedside. The results were recorded and compared according to the parameters given above. A scoring system was used to assess all these parameters except for stability. The stability of the procedures was evaluated according to the degrees of squint immediately after the adjustment and at least three months thereafter. RESULTS There was no significant difference between the procedures with regard to stability and ocular pain. During the early postoperative period, the level of consciousness was better and nausea and vomiting occurred less frequently in the patients operated by the one-stage procedure. Postoperative activity and oral intake returned to normal status more quickly in the one-stage group and the one-stage procedure was cost-effective. CONCLUSION We conclude that although both procedures provide satisfactory and stable results, the one-stage procedure has significant advantages over the two-stage procedure for medial rectus recession surgery in suitable cases.     

对多媒体投影式大学英语课堂教学的认识与思考

随着我国大学英语教学改革的实施,多媒体辅助英语教学正在得以推广和普及。本文以多媒体投影式大学英语课堂教学中存在的一些认识误区为视角,在建构主义理论的基础上,从"教师-课件-学生"三个方面探讨了多媒体投影式大学英语教学环境中需要注意和改进之处。     

基于树莓派的便携式静脉投影仪的研制

目的:研制一种基于树莓派的便携式静脉投影仪,以满足静脉穿刺时静脉可视化的需求.方法:该静脉投影仪基于静脉中脱氧血红蛋白对红外光的吸收强度高于静脉周边组织的原理设计,由树莓派、微机电系统(micro-electro-mechanical system,MEMS)激光扫描投影模组、加装红外滤光片的红外摄像头、电池、壳体及支...     

智能视力表投影仪的可重复性及其与传统视力表的比较

目的：分析智能视力表投影仪在视力检查中的可重复性及其与传统视力表测量结果的比较。方法：系列病例研究。收集2022年1月4—22日在首都医科大学附属北京同仁医院就诊的眼部不适患者60例（120眼）。先通过智能视力表投影仪（LSJ-IVAC-6000A）对患者进行3次视力检测,并采用组内相关系数（ICC）评价3次测量结果之间的可重复性;再用传统灯箱的国家标准视力表测量1次,并分别采用ICC和Bland-Altman图表法分析智能视力表投影仪与传统视力表检测结果的一致性。结果：同一受检者右眼、左眼使用智能视力表投影仪测量3次的ICC值分别为0.830和0.868,双眼的ICC值均>0.8（P<0.001）;同一受检者右眼、左眼使用智能视力表投影仪和传统灯箱的国家标准视力表测量的ICC值分别为0.846和0.873,双眼的ICC值均>0.8（P<0.001）。右眼、左眼使用智能视力表投影仪和传统灯箱的国家标准视力表测量差值的95%一致性界限分别为-0.25~0.20和-0.24~0.17。结论：智能视力表投影仪的可重复性较好,与传统灯箱的国家标准视力表的测量结果相比一致性较强,应用于临床工作中可提高视力筛查的效率并节省人力和物力。     

Endodontic management of badly broken down teeth using the canal projection system: two case reports

Aim  Teeth that have been weakened by caries and require root canal treatment to maintain their functional integrity may present with minimal coronal tooth structure and are a challenge for isolation and restoration. The aim of this clinical report is to demonstrate the management of badly broken down teeth using the Projector Endodontic Instrument Guidance System (PEIGS).
Summary  The PEIGS is an adjunct to root canal treatment designed to enhance the ease of treatment delivery. Use of this system facilitates projection of canal orifices from the floor of the pulp chamber to the cavosurface, providing direct visualization of and physical access to the projected canals. This report demonstrates the use of this novel device for the management of two badly broken down teeth.
Key learning points Use of the endodontic projection system has the following advantages:
• 'Projects' the canal orifice from the floor of the pulp chamber to the cavosurface, thereby enhancing visualization and access to the canals.
• The bonded coronal build up reduces the risk of interappointment crack initiation and coronal-radicular fracture of weakened tooth structure.
• Permits individualization of canals especially when they lie in close proximity to each other on the chamber floor.
• Isolation may be facilitated by ease of clamp retention, rendering many structurally debilitated teeth endodontically treatable.     

投影银幕的选择与保养

正确地选用和维护投影银幕,可以为多媒体投影机提供优良的显示条件,使明亮、清晰的图像得以再现.文章介绍了常用银幕的种类、特点及选用原则,并结合实践阐述了投影银幕的常用维护方法.     

New augmented reality and robotic based methods for head-surgery

Within the framework of the collaborative research centre "Information Technology in Medicine--Computer and Sensor-Aided Surgery" (SFB414) new methods for intraoperative computer assistance of surgical procedures are being developed. The developed tools will be controlled by an intraoperative host which provides interfaces to the electronic health record (EHR) and intraoperative computer assisted instruments.The interaction is based on standardised communication protocols. Plug & work functions will allow easy integration and configuration of new components. Intraoperative systems currently under development are intraoperative augmented reality (AR) using a projector and via a microscope, a planning system for definition of complex trajectories and a surgical robot system. The developed systems are under clinical evaluation and showing promising results in their application.     

多通道投影立体拼接显示墙的关键技术研究

就多投影立体拼接显示墙关键技术进行了研究和探讨,提出了影响立体感的两个指标最大视差和正负视差配比,给出了立体视差调节的指导性原则。首次提出了以实时曲线拟合生成边缘融合函数的方法,并基于平行双目投影模型,结合几何校正技术对多通道立体显示拼接墙进行了实现。实验证明,最大视差和正负视差配比对虚拟现实系统的立体感有着重要影响,并且基于曲线拟合的边缘融合方法能够快速实现多通道投影的无缝拼接。     

多媒体教室设备保护应用

文章分析了多媒体教室在使用中常出现故障现象的原因,并结合实践介绍了两种解决故障的措施,同时,就两种措施的优缺点进行了比较.     

液晶彩色投影机的使用及维护

液晶彩色投影机正确的安装、连接、调整、维护和保养是保证投影机正常运转的必要条件,文章结合多年来的工作实践介绍了投影机的使用和维护方法。