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力臂短
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     An Experimental Study on the Length and Arm of Quadriceps Femoris
     股四头肌长度和力臂的实验性研究
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     Measuring arm of force in all directions directly
     直接测量任意方向力的力臂
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     Moment arms of the wrist motor tendons and its implication
     人腕关节动力肌腱的力臂值及意义探讨
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Objective To describe the structure and clinical application of the single arm suspended reduction fixation device(HOIST device) for spondylolisthesis. Methods HOIST device is composed of the hauling screw, open angle screw(upholding screw), blocker, angle connective bar and blocking ring. Through the different assembly of the angle screws and the connective bar, to increase or decrease the fixation angle of the angle screw which as an upholding arm and the connective bar to meet the needs of different lumbosacral...

Objective To describe the structure and clinical application of the single arm suspended reduction fixation device(HOIST device) for spondylolisthesis. Methods HOIST device is composed of the hauling screw, open angle screw(upholding screw), blocker, angle connective bar and blocking ring. Through the different assembly of the angle screws and the connective bar, to increase or decrease the fixation angle of the angle screw which as an upholding arm and the connective bar to meet the needs of different lumbosacral angles and hauling screw reducing distance. Twenty three patients with an average slipping rate of 25%- 50% , were treated with the device, and among them, intervertebral implantation of BAK was done in 5 patients and intervertebral fusion was performed in 18 patients. Results The mean duration of follow up was 10.3 months. Olisthy was reduced completely, clinical symptoms disappeared and there was no serious complications. Conclusion This device only required fixation of the slipped and its inferior adjacent vertebral body, and then it causes little influence to the movement of the lumbar spine. The arm of force of the reduction is short, so it is especially indicated for mild and moderate spondylolisthesis.

目的介绍单臂悬吊腰椎滑脱复位固定器 (HOIST器械)的结构、原理及在轻、中度腰椎滑脱治疗中的应用。方法 HOIST器械由提拉螺钉、角度开口螺钉 (支撑螺钉 )、阻塞器、角度连接棒及阻挡环等组成。通过角度开口螺钉与角度连接棒的不同组合应用,增大或减小作为支撑臂的角度开口螺钉与连接棒之间的固定角度,以满足不同腰骶角及复位距离的需要。治疗 23例腰椎滑脱患者,滑脱率为 25%~ 50%, 5例术中同时行椎间 BAK置入, 18例行椎间植骨融合。结果术后随访 5~ 16个月,平均 10.3个月,滑脱椎体完全复位,临床症状消失,无严重并发症。结论 HOIST器械只需固定滑脱及其相邻的下位椎体,对腰椎活动度影响小,由于复位的力臂短,更适用于轻、中度腰椎滑脱的治疗。

Objective To evaluate the shape and structure of different separators affecting the mechanical behavior . Methods The stress of different separators was analyzed by ANSYS software. Various separators were meshed into one-dimensional solid elements and the material character parameters were inputted. The loads were added gradually. Results The stress was related to the arm of force and the point of force application . Conclusions The force applied can be controlled by selecting different separators .

目的 分析不同规格分牙簧的应力 ,找出形状结构因素对分牙簧力学行为影响的规律。方法 对分牙簧进行一维实体网格划分并输入材料性能参数。然后按力作用点的位移不同 ,从小到大逐步加载 ,应用ANSYS分析软件计算不同型号分牙簧在不同应变量时产生的应力值。结果分牙簧的应力大小与力臂长短有关 ,力臂短者产生的力值大 ;分牙簧的应力随位移的增加而增大 ,其变化规律可用公式F =A +Bx表示。结论 分牙簧应力随其尺寸与力作用点位移而变化 ,临床医生可根据矫治需要在一定范围内选择适宜的分牙簧以调节其作用力值。

Objective The aim of this study is to repair the anatomy and regain the stability of the lumbar discontinuous isthmus treated by hook system Hs by single section fixation in teenager, as to relief the symptom and improve the life quality of the patients. Methods 5 teenagers were diagnosed lumbar discontinuous isthmus and treated by fusion and single section fixation by HS. Results All cases were followed up for 12 to 18 months. The recovery of the lumbar activity and the fusion rate were satisfied. Lumbar pain...

Objective The aim of this study is to repair the anatomy and regain the stability of the lumbar discontinuous isthmus treated by hook system Hs by single section fixation in teenager, as to relief the symptom and improve the life quality of the patients. Methods 5 teenagers were diagnosed lumbar discontinuous isthmus and treated by fusion and single section fixation by HS. Results All cases were followed up for 12 to 18 months. The recovery of the lumbar activity and the fusion rate were satisfied. Lumbar pain disappeared in 3 months and the isthmus splits showed in X-ray image were gone in 4 months in all cases. Conclusion Compared with the muti-section fixation which cause side effect to the activity, mechanics, growth and development of the spinal column, single section fixation by HS has the advantage of short designed force arm, force concentration, mini-invasive and reliable physical and physiological fixation which improve the fusion rate as to achieve physiological reconstruction of the spinal column.

目的恢复患者正常解剖关系和脊柱的稳定,消除症状,提高生活质量。方法应用钉钩系统单节段固定加上峡部植骨融合治疗青少年腰椎峡部不连。结果5例患者分别随访12~18个月。腰部活动恢复满意,术后3个月腰痛症状完全消失。术后4个月X线示峡部裂消失,植骨融合满意。结论钉钩固定系统SSE为节段性固定,设计力臂短,应力集中,固定牢固,确保植骨融合而达到长久的生理稳定。避免了多节段融合对脊柱的活动度、力学、生长发育等不良影响,达到“生理性重建”。

 
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