Perigee系统治疗前盆腔脏器脱垂的近期疗效分析

目的:评价Perigee系统治疗女性前盆腔器官脱垂的安全性及临床疗效。方法 :对24例盆腔器官脱垂定量系统(pelvic organ prolapse-quantitation,POP-Q)诊断为Ⅱ度或以上的前盆腔器官脱垂患者行Perigee前盆底重建术,采用主观评价[盆底功能障碍影响问卷简版(PFIQ-7)、性生活质量问卷]和客观评价(POP-Q)对围手术期及术后近期各项指标的变化及并发症发生情况进行分析。结果:24例患者的平均手术时间(70.83±15.30)min,术中平均出血(80.92±40.39)ml,术后中位随访时间为4个月。以POP-Q评分作为客观疗效评价指标,治愈率为100%;PFIQ-7评分较术前有显著改善;术后1例有性生活,性生活质量无明显下降。术后发生网片暴露1例(4.2%);新发压力性尿失禁2例(8.4%);会阴部、臀部疼痛4例(16.7%);新发阴道后壁脱垂3例(12.6%);无严重并发症发生。结论:Perigee系统是治疗前盆腔脏器脱垂的安全、微创术式,近期疗效肯定,中远期疗效待进一步随访。

Perigee系统治疗前盆腔器官脱垂的近期疗效评价

目的评价Perigee系统治疗前盆腔器官脱垂的近期疗效。方法选择北京大学人民医院2012年10月至2014年9月收治的59例盆腔器官脱垂患者，经盆腔器官脱垂定量（POP—Q）分度法诊断为前盆腔器官脱垂Ⅲ-Ⅳ度；行Perigee系统前盆底重建术，同时部分患者行骶棘韧带悬吊术、阴道后壁修补术或后盆底重建术治疗其他部位脱垂。采用盆底不适调查表简表（PFDI-20）、盆底器官脱垂-尿失禁性生活问卷12（PISQ-12）评价主观疗效，并对手术前、后POP-Q各指示点位置的变化和并发症发生情况进行分析。结果59例患者的平均手术时间为（99±29）min，平均术中出血量为（119±92）ml。59例患者术后复诊的中位时间为17．5个月（范围：8～30个月），主观症状电话随访中位时间21．2个月（范围：11～34个月），术后PFDI-20总分（M=5．6分）与术前（M=27．8分）比较，差异有统计学意义（P〈0．01）。PISQ．12评分[术前为（34±3）分，术后为（36±4）分]术前、术后比较，差异有统计学意义（P〈0．05）。近期解剖学治愈率为98％（58／59），复发1例（2％，1／59），网片侵蚀2例（3％，2／59）。结论Perigee系统对于治疗前盆腔器官脱垂安全可靠、并发症少，近期效果明显，远期疗效有待进一步研究。

特定部位自体组织盆底修补术和Perigee系统治疗重度盆腔脏器脱垂的临床疗效

目的评价特定部位自体组织盆底修补术和Perigee系统治疗重度盆腔脏器脱垂(POP)的临床疗效及安全性。方法 100例诊断为子宫或膀胱脱垂Ⅲ度及以上患者分别采用Perigee盆底重建术(A组,50例)和特定部位自体组织盆底修补术(B组,50例)。手术前后采用POP定量分期(POP-Q)、盆底功能障碍问卷(PFDI-20)和性生活质量问卷(PISQ-12)分析疗效和相关并发症发生情况。结果完成随访91例,中位随访时间为22个月。两种方法均是治疗重度POP的安全有效术式,主观治愈率均为100%;A组客观治愈率93.5%,B组88.9%(P>0.05)。两组在手术时间、术中出血量、术后PFDI-20和PISQ-12评分等方面无统计学差异(P>0.05)。A、B组术后各有2例新发压力性尿失禁;A组网片暴露1例,阴道挛缩1例。结论两种方法均是治疗重度POP的安全有效术式;A组增加网片相关并发症。

Perigee系统治疗中重度前中盆腔联合缺陷的临床分析

目的评价Perigee系统治疗女性中重度前中盆腔联合缺陷的临床疗效和安全性。方法对2011年10月至2014年1月该院50例盆腔器官脱垂定量（POP—Q）分期法诊断为子宫或膀胱脱垂Ⅲ度及以上患者行Perigee术式，手术前后采用POP—Q、盆底功能障碍问卷（PFDI-20）、性生活质量问卷（PISQ-12）对各项指标及网片相关并发症发生情况进行分析。结果平均手术时间（70．31±15．86）min，术中平均出血（61．56±45．02）ml，术后随访4～27个月（中位随访时间21个月）。客观治愈率93．5％，主观治愈率100．0％；PFDI-20评分较术前显著改善；有性生活患者6例，手术前后性生活质量无明显变化。术后发生网片暴露1例（2．2％）；新发压力性尿失禁2例（4．3％）；新发阴道后壁脱垂3例（6．5％）；阴道挛缩1例（2．2％）；无严重并发症发生。结论Perigee系统是治疗中重度前中盆腔联合缺陷的安全、有效术式，长期疗效及并发症待进一步随访。

The Injection Velocity and Apogee Simulation for Transfer Elliptical Satellite Orbits

Basic resources for communication satellites are communication radio-frequencies and satellite orbits. An orbit is the trajectory followed by the satellite. The communication between the satellite and a ground station is established only when the satellite is consolidated in its own orbit and it is visible from the ground station. Different types of orbits are possible, each suitable for a specific application or mission. Most used orbits are circular, categorized as low, medium and geosynchronous (geostationary) orbits based on the attitude above the Earths surface. The launching process heading the satellite in geostationary orbit, by the first step places the satellite in a transfer orbit. The transfer orbit is elliptical in shape with low attitude at perigee, and the apogee of the geostationary orbit attitude. The apogee of the parking orbit depends on the injection velocity applied at perigee. Simulation approach of injection velocity at perigee to attain different apogees, considering an incremental step is presented in this paper.

大椭圆轨道的运载火箭弹道设计

For the final stage of a launch vehicle which cannot start multiple times,the main constraint of a highly eccentric orbit launch mission is the argument of perigee,which is conditioned by the range.This paper studies the payload capacity at different launch sites for a highly eccentric orbit(e.g.GTO)and gives a method to improve the payload capacity with an argument of perigee constraint by increasing the sliding time before the final ignition and simultaneously adjusting the launch azimuth and yaw at the final stage.An example of launching to GTO orbit on a rocket from Hainan is given,which proves that the method has strong engineering value.

Air traffic monitoring using optimized ADS-B CubeSat constellation

The primary technique used for air traffic surveillance is radar.However,nowadays,its role in surveillance is gradually being replaced by the recently adopted Automatic Dependent Surveillance-Broadcast(ADS-B).ADS-B offers a higher accuracy,lower power consumption,and longer range than radar,thus providing more safety to aircraft.The coverage of terrestrial radar and ADS-B is confined to continental parts of the globe,leaving oceans and poles uncovered by real-time surveillance measures.This study presents an optimized Low-Earth Orbit(LEO)-based ADS-B constellation for global air traffic surveillance over intercontinental trans-oceanic flight routes.The optimization algorithm is based on performance evaluation parameters,i.e.,coverage time,satellite availability,and orbit stability(precession and perigee rotation),and communication analysis.The results indicate that the constellation provides ample coverage in the simulated global oceanic regions.The constellation is a feasible and cost-effective solution for global air supervision,which can supplement terrestrial ADS-B and radar systems.