经阴道植入网片手术(transvaginal mesh,TVM)是治疗女性盆底器官脱垂(pelvic organ prolapse,POP)的重要手术方式,尤其是针对严重脱垂及复发脱垂患者,该手术方式解剖复位好、治愈率高、复发率低[1]。目前该手术主要采用聚丙烯合成网片,...经阴道植入网片手术(transvaginal mesh,TVM)是治疗女性盆底器官脱垂(pelvic organ prolapse,POP)的重要手术方式,尤其是针对严重脱垂及复发脱垂患者,该手术方式解剖复位好、治愈率高、复发率低[1]。目前该手术主要采用聚丙烯合成网片,大多数患者能从手术中受益,但也有可能出现一些与网片相关的疼痛、感染、损伤、侵蚀、暴露等并发症[2-3]。目前单独针对TVM术后网片膀胱暴露的报道较少。本研究分析了重庆市妇幼保健院近5年所行的995例盆底重建手术患者中出现的2例经阴道前盆底重建术后网片侵蚀膀胱暴露患者,现报道如下。展开更多
Profile shift is a highly effective technique for optimizing the performance of spur gear transmission systems.However,tooth surface wear is inevitable during gear meshing due to inadequate lubrication and long-term o...Profile shift is a highly effective technique for optimizing the performance of spur gear transmission systems.However,tooth surface wear is inevitable during gear meshing due to inadequate lubrication and long-term operation.Both profile shift and tooth surface wear(TSW)can impact the meshing characteristics by altering the involute tooth profile.In this study,a tooth stiffness model of spur gears that incorporates profile shift,TSW,tooth deformation,tooth contact deformation,fillet-foundation deformation,and gear body structure coupling is established.This model efficiently and accurately determines the time-varying mesh stiffness(TVMS).Additionally,an improved wear depth prediction method for spur gears is developed,which takes into consideration the mutually prime teeth numbers and more accurately reflects actual gear meshing conditions.Results show that consideration of the mutual prime of teeth numbers will have a certain impact on the TSW process.Furthermore,the finite element method(FEM)is employed to accurately verify the values of TVMS and load sharing ratio(LSR)of profile-shifted gears and worn gears.This study quantitatively analyzes the effect of profile shift on the surface wear process,which suggests that gear profile shift can partially alleviate the negative effects of TSW.The contribution of this study provides valuable insights into the design and maintenance of spur gear systems.展开更多
文摘经阴道植入网片手术(transvaginal mesh,TVM)是治疗女性盆底器官脱垂(pelvic organ prolapse,POP)的重要手术方式,尤其是针对严重脱垂及复发脱垂患者,该手术方式解剖复位好、治愈率高、复发率低[1]。目前该手术主要采用聚丙烯合成网片,大多数患者能从手术中受益,但也有可能出现一些与网片相关的疼痛、感染、损伤、侵蚀、暴露等并发症[2-3]。目前单独针对TVM术后网片膀胱暴露的报道较少。本研究分析了重庆市妇幼保健院近5年所行的995例盆底重建手术患者中出现的2例经阴道前盆底重建术后网片侵蚀膀胱暴露患者,现报道如下。
基金Supported by National Natural Science Foundation of China (Grant No.52275061)。
文摘Profile shift is a highly effective technique for optimizing the performance of spur gear transmission systems.However,tooth surface wear is inevitable during gear meshing due to inadequate lubrication and long-term operation.Both profile shift and tooth surface wear(TSW)can impact the meshing characteristics by altering the involute tooth profile.In this study,a tooth stiffness model of spur gears that incorporates profile shift,TSW,tooth deformation,tooth contact deformation,fillet-foundation deformation,and gear body structure coupling is established.This model efficiently and accurately determines the time-varying mesh stiffness(TVMS).Additionally,an improved wear depth prediction method for spur gears is developed,which takes into consideration the mutually prime teeth numbers and more accurately reflects actual gear meshing conditions.Results show that consideration of the mutual prime of teeth numbers will have a certain impact on the TSW process.Furthermore,the finite element method(FEM)is employed to accurately verify the values of TVMS and load sharing ratio(LSR)of profile-shifted gears and worn gears.This study quantitatively analyzes the effect of profile shift on the surface wear process,which suggests that gear profile shift can partially alleviate the negative effects of TSW.The contribution of this study provides valuable insights into the design and maintenance of spur gear systems.
