This study proposes a novel mild steel damper with non-uniform vertical slits. The influence of different shapes of vertical slits of the core energy plate on the energy dissipation and buckling resistance capacities ...This study proposes a novel mild steel damper with non-uniform vertical slits. The influence of different shapes of vertical slits of the core energy plate on the energy dissipation and buckling resistance capacities is analyzed. Based on the theoretical analysis, formulas of key parameters of the dampers, including the elastic lateral stiffness, shear bearing capacity and yield displacement, are derived. The effectiveness of the proposed damper is demonstrated through pseudo static tests on four 0.25-scale specimens. Performance of these dampers, i.e. cyclic deformation, stress distribution, energy dissipation capacity, etc., are presented and discussed. Using the numerical models of dampers calibrated through test data, earthquake time-history analyses were conducted, and it is observed that the dampers significantly reduce the seismic responses of the prototype frame and have a desirable energy dissipation capacity.展开更多
AIM: To investigate the therapeutic effects of simultaneous horizontal and vertical operations on dissociated vertical deviation(DVD) associated with other deviations.METHODS: Forty-five cases of DVD with horizontal a...AIM: To investigate the therapeutic effects of simultaneous horizontal and vertical operations on dissociated vertical deviation(DVD) associated with other deviations.METHODS: Forty-five cases of DVD with horizontal and torsional strabismus underwent combined operation were collected retrospectively. All clinical records were analyzed. All patients were followed up for 6 to 24 mo. Wilcoxon signed-ranks test was performed to evaluate the changes of vertical and horizontal deviation. χ~2 test was used to evaluate the changes of binocular visual function. RESULTS: Forty-five cases included 36 patients with intermittent exotropia and binocular inferior oblique overaction(IOOA), 5 patients with concomitant esotropia and binocular IOOA, 4 patients with intermittent exotropia and monocular superior oblique palsy. The superior rectus recession(SRR) combined with horizontal rectus recession and the myectomy of inferior oblique or anterior transposition were operated simultaneously to correct all types of strabismus. There were 43 cases who achieved normal eye position in vertical direction, while 2 cases were with undercorrection of 5~Δ to 6~Δ. In patients with horizontal strabismus, 2 cases of exotropia were with overcorrection of 6~Δ to 8~Δ, 1 case of esotropia was with undercorrection of 6~Δ, and 1 case of monocular superior oblique palsy with compensatory head posture was not significantly improved. The binocular visual function of most patients recovered after operation. The difference of the binocular visual function and eye position were significant compared with that before operation(P<0.05).CONCLUSION: The simultaneous operation on DVD with horizontal and torsional strabismus is successful.展开更多
AIM:To describe the experience with half-width vertical muscles transposition(VRT)augmented with posterior fixation sutures.METHODS:The clinical charts of all patients,who underwent half-width VRT augmented with poste...AIM:To describe the experience with half-width vertical muscles transposition(VRT)augmented with posterior fixation sutures.METHODS:The clinical charts of all patients,who underwent half-width VRT augmented with posterior fixation sutures for sixth cranial nerve palsy from January 2003 to December 2018,were retrospectively reviewed.For each patient,pre-and post-operatively,the largest measured angle was used for the calculations,usually resulting with the angle for distance,except in young infants,where measurements were made at near fixation using the Krimsky test.RESULTS:Fifteen patients met the inclusion criteria for the study,of them 9(60.0%)had also medial rectus muscle recession at the time of surgery.Mean follow-up period was 21.4±23.2mo(range 1.5-82mo).Preoperative mean esotropia was 51.3±19.7 prism diopter(PD;range 20-90 PD).Postoperative mean deviation on final follow-up was 7.7±20.2 PD(range-40 to 35 PD;P=0.018).In all patients with preoperative abnormal head position,improvement was noted.Ten(66.7%)patients had improvement in abduction and 10(66.7%)patients reported improvement in their diplopia,by final follow-up.The addition of medial rectus recession was correlated with a larger change in postoperative horizontal deviation compared to baseline(P=0.026).Two(13.3%)patients developed a vertical deviation in the immediate postoperative period which had resolved in one of them.CONCLUSION:Half-width VRT augmented with posterior fixation suture,with or without medial rectus muscle recession,is an effective and safe procedure for esotropia associated with sixth cranial nerve palsy.A major improvement in the angle of deviation is expected.Most patients will have improvement in their abnormal head position and diplopia.展开更多
总结分离性垂直偏斜(DVD)并垂直性斜视的诊断要点。在8例DVD 并垂直性斜视患儿的手术治疗中,观察到上直肌后徙后固定缝线术对 DVD的疗效较为肯定。而部份患者在行下斜肌后徙术后,DVD 减轻或消失了。认为:对 DVD 并垂直性斜视的患者,应...总结分离性垂直偏斜(DVD)并垂直性斜视的诊断要点。在8例DVD 并垂直性斜视患儿的手术治疗中,观察到上直肌后徙后固定缝线术对 DVD的疗效较为肯定。而部份患者在行下斜肌后徙术后,DVD 减轻或消失了。认为:对 DVD 并垂直性斜视的患者,应首先矫正垂直性斜视,根据术后 DVD 的变化情况,再决定是否行 DVD 矫正术。展开更多
目的：探讨水平斜视合并小度数垂直斜视患者术后垂直眼位的变化。方法回顾性分析本院2013年6月至2014年6月收治的48例（68只眼）术前水平斜视合并小度数垂直斜视患者的临床资料，其中内斜视22例（32只眼），外斜视26例（36只眼），患者...目的：探讨水平斜视合并小度数垂直斜视患者术后垂直眼位的变化。方法回顾性分析本院2013年6月至2014年6月收治的48例（68只眼）术前水平斜视合并小度数垂直斜视患者的临床资料，其中内斜视22例（32只眼），外斜视26例（36只眼），患者均行缩短及水平后徒手术，未行垂直肌及水平肌垂直移位手术。术后对患者随访6～12个月，观察垂直眼位的变化。结果内斜视患者术前平均垂直斜视角为（7．10±2．12）°，术后平均垂直斜视角为（3．45±1．24）°，垂直斜视角减少量为（3．82±1．04）°，手术前后垂直斜角比较有统计学意义（ P ＜0.05）。外斜视患者术前平均垂直斜视角为（7．05±2．09）°，术后平均垂直斜视角为（2．52±1．22）°，垂直斜视角减少量为（4．52±1．12）°，手术前后垂直斜角比较有统计学意义（ P ＜0.05）。内外斜视患者术后垂直斜角减少量与术前垂直斜角大小均呈正相关（ P ＜0.05）。内、外斜视患者术前黄斑中心凹与视盘几何中心相对角度（ FDA）手术前后比较均无统计学差异（ P ＞0.05）。结论水平斜视合并小度数垂直斜视患者行水平肌手术治疗后能改善垂直眼位，且改善效果与患者术前垂直斜视角呈正相关。展开更多
基金Natural Science Foundation of China under Grant No.51278104
文摘This study proposes a novel mild steel damper with non-uniform vertical slits. The influence of different shapes of vertical slits of the core energy plate on the energy dissipation and buckling resistance capacities is analyzed. Based on the theoretical analysis, formulas of key parameters of the dampers, including the elastic lateral stiffness, shear bearing capacity and yield displacement, are derived. The effectiveness of the proposed damper is demonstrated through pseudo static tests on four 0.25-scale specimens. Performance of these dampers, i.e. cyclic deformation, stress distribution, energy dissipation capacity, etc., are presented and discussed. Using the numerical models of dampers calibrated through test data, earthquake time-history analyses were conducted, and it is observed that the dampers significantly reduce the seismic responses of the prototype frame and have a desirable energy dissipation capacity.
文摘AIM: To investigate the therapeutic effects of simultaneous horizontal and vertical operations on dissociated vertical deviation(DVD) associated with other deviations.METHODS: Forty-five cases of DVD with horizontal and torsional strabismus underwent combined operation were collected retrospectively. All clinical records were analyzed. All patients were followed up for 6 to 24 mo. Wilcoxon signed-ranks test was performed to evaluate the changes of vertical and horizontal deviation. χ~2 test was used to evaluate the changes of binocular visual function. RESULTS: Forty-five cases included 36 patients with intermittent exotropia and binocular inferior oblique overaction(IOOA), 5 patients with concomitant esotropia and binocular IOOA, 4 patients with intermittent exotropia and monocular superior oblique palsy. The superior rectus recession(SRR) combined with horizontal rectus recession and the myectomy of inferior oblique or anterior transposition were operated simultaneously to correct all types of strabismus. There were 43 cases who achieved normal eye position in vertical direction, while 2 cases were with undercorrection of 5~Δ to 6~Δ. In patients with horizontal strabismus, 2 cases of exotropia were with overcorrection of 6~Δ to 8~Δ, 1 case of esotropia was with undercorrection of 6~Δ, and 1 case of monocular superior oblique palsy with compensatory head posture was not significantly improved. The binocular visual function of most patients recovered after operation. The difference of the binocular visual function and eye position were significant compared with that before operation(P<0.05).CONCLUSION: The simultaneous operation on DVD with horizontal and torsional strabismus is successful.
文摘AIM:To describe the experience with half-width vertical muscles transposition(VRT)augmented with posterior fixation sutures.METHODS:The clinical charts of all patients,who underwent half-width VRT augmented with posterior fixation sutures for sixth cranial nerve palsy from January 2003 to December 2018,were retrospectively reviewed.For each patient,pre-and post-operatively,the largest measured angle was used for the calculations,usually resulting with the angle for distance,except in young infants,where measurements were made at near fixation using the Krimsky test.RESULTS:Fifteen patients met the inclusion criteria for the study,of them 9(60.0%)had also medial rectus muscle recession at the time of surgery.Mean follow-up period was 21.4±23.2mo(range 1.5-82mo).Preoperative mean esotropia was 51.3±19.7 prism diopter(PD;range 20-90 PD).Postoperative mean deviation on final follow-up was 7.7±20.2 PD(range-40 to 35 PD;P=0.018).In all patients with preoperative abnormal head position,improvement was noted.Ten(66.7%)patients had improvement in abduction and 10(66.7%)patients reported improvement in their diplopia,by final follow-up.The addition of medial rectus recession was correlated with a larger change in postoperative horizontal deviation compared to baseline(P=0.026).Two(13.3%)patients developed a vertical deviation in the immediate postoperative period which had resolved in one of them.CONCLUSION:Half-width VRT augmented with posterior fixation suture,with or without medial rectus muscle recession,is an effective and safe procedure for esotropia associated with sixth cranial nerve palsy.A major improvement in the angle of deviation is expected.Most patients will have improvement in their abnormal head position and diplopia.
文摘总结分离性垂直偏斜(DVD)并垂直性斜视的诊断要点。在8例DVD 并垂直性斜视患儿的手术治疗中,观察到上直肌后徙后固定缝线术对 DVD的疗效较为肯定。而部份患者在行下斜肌后徙术后,DVD 减轻或消失了。认为:对 DVD 并垂直性斜视的患者,应首先矫正垂直性斜视,根据术后 DVD 的变化情况,再决定是否行 DVD 矫正术。
文摘目的：探讨水平斜视合并小度数垂直斜视患者术后垂直眼位的变化。方法回顾性分析本院2013年6月至2014年6月收治的48例（68只眼）术前水平斜视合并小度数垂直斜视患者的临床资料，其中内斜视22例（32只眼），外斜视26例（36只眼），患者均行缩短及水平后徒手术，未行垂直肌及水平肌垂直移位手术。术后对患者随访6～12个月，观察垂直眼位的变化。结果内斜视患者术前平均垂直斜视角为（7．10±2．12）°，术后平均垂直斜视角为（3．45±1．24）°，垂直斜视角减少量为（3．82±1．04）°，手术前后垂直斜角比较有统计学意义（ P ＜0.05）。外斜视患者术前平均垂直斜视角为（7．05±2．09）°，术后平均垂直斜视角为（2．52±1．22）°，垂直斜视角减少量为（4．52±1．12）°，手术前后垂直斜角比较有统计学意义（ P ＜0.05）。内外斜视患者术后垂直斜角减少量与术前垂直斜角大小均呈正相关（ P ＜0.05）。内、外斜视患者术前黄斑中心凹与视盘几何中心相对角度（ FDA）手术前后比较均无统计学差异（ P ＞0.05）。结论水平斜视合并小度数垂直斜视患者行水平肌手术治疗后能改善垂直眼位，且改善效果与患者术前垂直斜视角呈正相关。
