AIM: To describe initial results and experimental error measurement of a protocol analyzing Human posture through sagittal intersegmental moments. METHODS: Postural analysis has been recently improved by development o...AIM: To describe initial results and experimental error measurement of a protocol analyzing Human posture through sagittal intersegmental moments. METHODS: Postural analysis has been recently improved by development of three-dimensional radiographic imaging systems. However, in various situations such as global sagittal anterior malalignment interpretation of radiographs may not represent the real alignment of the subject. The aim of this study was to present initial results of a 3D biomechanical protocol. This protocol isobtained in a free standing position and characterizes postural balance by measurement of sagittal intersegmental net moments. After elaboration of a specific marker-set, 4 successive recordings were done on two volunteers by three different operators during three sessions in order to evaluate the experimental error measurement. A supplementary acquisition in a "radiographic" posture was also obtained. Once the data acquired, joint center, length, anatomical frame and the center of mass of each body segment was calculated and a mass affected. Sagittal net intersegmental moments were computed in an ascending manner from ground reaction forces at the ankles, knees, hips and the lumbosacral and thoraco-lumbar spinal junctions. Cervicothoracic net intersegmental moment was calculated in a descending manner.RESULTS: Based on average recordings, clinical interpretation of net intersegmental moments(in N.m) showed a dorsal flexion on the ankles(8.6 N.m), a flexion on the knees(7.5 N.m) and an extension on the hips(8.5 N.m). On the spinal junctions, it was flexion moments: 0.34 N.m on the cervico-thoracic; 6.7 N.m on the thoraco-lumbar and 0.65 N.m on the lumbo-sacral. Evaluation of experimental error measurement showed a small inter-trial error(intrinsic variability), with higher inter-session and inter-therapist errors but without important variation between them. For one volunteer the "radiographic" posture was associated to significant changes compared to the free standing position. CONCLUSION: These initial results confirm the technical feasibility of the protocol. The low intrinsic error and the small differences between inter-session and intertherapist errors seem to traduce postural variability over time, more than a failure of the protocol. Characterization of sagittal intersegmental net moments can have clinical applications such as evaluation of an unfused segment after a spinal arthrodesis.展开更多
背景与目的全胸腔镜肺段切除术随早期肺癌的高检出率逐渐受到关注,其中肺段切除术段间平面分离最常用的方法是电刀切割手工缝合和应用直线切割缝合器机械切割两种。但仅有很少的研究对两者进行对比,且均针对开放式肺段切除术,目前尚未...背景与目的全胸腔镜肺段切除术随早期肺癌的高检出率逐渐受到关注,其中肺段切除术段间平面分离最常用的方法是电刀切割手工缝合和应用直线切割缝合器机械切割两种。但仅有很少的研究对两者进行对比,且均针对开放式肺段切除术,目前尚未有相应的研究针对全胸腔镜肺段切除术。本研究旨在探讨两种方法在全胸腔镜手术中的应用及安全性对比。方法回顾性分析2013年9月-2016年3月北京大学第一医院胸外科行全胸腔镜肺段切除术的连续58例患者,根据段间平面分离方法不同分为电刀切割组30例和机械切割组28例,对两组患者手术时间、出血量、术后胸管留置时间、术后住院时间、胸腔引流量及术后并发症进行比较。结果除手术时间[电刀切割组(248.70±54.46)min和机械切割组(209.39±67.25)min]两组间有统计学差异(P=0.017)外,术中出血量(60.00mL vs 65.00 mL)、胸腔引流总量(445.00 mL vs 590.00 mL)、术后3天胸腔引流量[(455.33±318.333)mL vs(422.32±194.95)mL]、术后胸管留置时间(3.50天vs 4.00天)和术后住院时间(6.00天vs 6.00天)、术后并发症发生率(5/30vs 2/28),两组差异均无统计学意义。结论全胸腔镜肺段切除术段间平面的分离方法中,应用电刀切割手工缝合手术时间相对较长,但安全性不劣于应用切割缝合器机械切割缝合。展开更多
目的利用斑马鱼模型探讨复方苦参注射液联用顺铂对血管生成的协同抑制作用。方法采用24hpf(hour post fertilization,hpf)健康TG(VEGFR2∶GFP)系血管荧光转基因斑马鱼作为实验动物模型,分别用复方苦参注射液、顺铂、以及两药联合处理24h...目的利用斑马鱼模型探讨复方苦参注射液联用顺铂对血管生成的协同抑制作用。方法采用24hpf(hour post fertilization,hpf)健康TG(VEGFR2∶GFP)系血管荧光转基因斑马鱼作为实验动物模型,分别用复方苦参注射液、顺铂、以及两药联合处理24h,以节间血管作为考察依据,并用SPSS软件对所得数据进行统计处理。结果顺铂单用时以50,100μg·ml-1浓度抑制节间血管效果明显,复方苦参注射液为0.5%时抑制节间血管效果明显,两者联用时较单用抑制更明显。结论复方苦参注射液与顺铂有一定的抑制血管生成作用,两者联合具有协同增效作用。展开更多
It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir.To solve this problem,this study proposes t...It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir.To solve this problem,this study proposes to use packers,sealing cannula and other tools in the same horizontal well to inject water in some fractures and produce oil from other fractures.This new energy supplement method forms a segmental synchronous injection-production system in a horizontal well.The method can reduce the distance between the injection end and the production end,and quickly establish an effective displacement system.Changing the displacement between wells to displacement between horizontal well sections,and point water flooding to linear uniform water flooding,the method can enhance water sweeping volume and shorten waterflooding response period.The research shows that:(1)In the synchronous injection and production of horizontal well in an ultra-low-permeability sandstone reservoir,the water injection section should select the section where the natural fractures and artificial fractures are in the same direction or the section with no natural fractures,and the space between two sections should be 60?80 m.(2)In addition to controlling injection pressure,periodic water injection can be taken to reduce the risk of re-opening and growth of natural fractures or formation fracture caused by the gradual increase of water injection pressure with water injection going on.(3)Field tests have verified that this method can effectively improve the output of single well and achieve good economic benefits,so it can be widely used in the development of ultra-low permeability sandstone reservoirs.展开更多
基金Supported by The Association pour le Développement des Recherches biologiques et Médicales and the French Society of Orthopaedics and trauma surgery(Blondel B)
文摘AIM: To describe initial results and experimental error measurement of a protocol analyzing Human posture through sagittal intersegmental moments. METHODS: Postural analysis has been recently improved by development of three-dimensional radiographic imaging systems. However, in various situations such as global sagittal anterior malalignment interpretation of radiographs may not represent the real alignment of the subject. The aim of this study was to present initial results of a 3D biomechanical protocol. This protocol isobtained in a free standing position and characterizes postural balance by measurement of sagittal intersegmental net moments. After elaboration of a specific marker-set, 4 successive recordings were done on two volunteers by three different operators during three sessions in order to evaluate the experimental error measurement. A supplementary acquisition in a "radiographic" posture was also obtained. Once the data acquired, joint center, length, anatomical frame and the center of mass of each body segment was calculated and a mass affected. Sagittal net intersegmental moments were computed in an ascending manner from ground reaction forces at the ankles, knees, hips and the lumbosacral and thoraco-lumbar spinal junctions. Cervicothoracic net intersegmental moment was calculated in a descending manner.RESULTS: Based on average recordings, clinical interpretation of net intersegmental moments(in N.m) showed a dorsal flexion on the ankles(8.6 N.m), a flexion on the knees(7.5 N.m) and an extension on the hips(8.5 N.m). On the spinal junctions, it was flexion moments: 0.34 N.m on the cervico-thoracic; 6.7 N.m on the thoraco-lumbar and 0.65 N.m on the lumbo-sacral. Evaluation of experimental error measurement showed a small inter-trial error(intrinsic variability), with higher inter-session and inter-therapist errors but without important variation between them. For one volunteer the "radiographic" posture was associated to significant changes compared to the free standing position. CONCLUSION: These initial results confirm the technical feasibility of the protocol. The low intrinsic error and the small differences between inter-session and intertherapist errors seem to traduce postural variability over time, more than a failure of the protocol. Characterization of sagittal intersegmental net moments can have clinical applications such as evaluation of an unfused segment after a spinal arthrodesis.
文摘背景与目的全胸腔镜肺段切除术随早期肺癌的高检出率逐渐受到关注,其中肺段切除术段间平面分离最常用的方法是电刀切割手工缝合和应用直线切割缝合器机械切割两种。但仅有很少的研究对两者进行对比,且均针对开放式肺段切除术,目前尚未有相应的研究针对全胸腔镜肺段切除术。本研究旨在探讨两种方法在全胸腔镜手术中的应用及安全性对比。方法回顾性分析2013年9月-2016年3月北京大学第一医院胸外科行全胸腔镜肺段切除术的连续58例患者,根据段间平面分离方法不同分为电刀切割组30例和机械切割组28例,对两组患者手术时间、出血量、术后胸管留置时间、术后住院时间、胸腔引流量及术后并发症进行比较。结果除手术时间[电刀切割组(248.70±54.46)min和机械切割组(209.39±67.25)min]两组间有统计学差异(P=0.017)外,术中出血量(60.00mL vs 65.00 mL)、胸腔引流总量(445.00 mL vs 590.00 mL)、术后3天胸腔引流量[(455.33±318.333)mL vs(422.32±194.95)mL]、术后胸管留置时间(3.50天vs 4.00天)和术后住院时间(6.00天vs 6.00天)、术后并发症发生率(5/30vs 2/28),两组差异均无统计学意义。结论全胸腔镜肺段切除术段间平面的分离方法中,应用电刀切割手工缝合手术时间相对较长,但安全性不劣于应用切割缝合器机械切割缝合。
文摘目的利用斑马鱼模型探讨复方苦参注射液联用顺铂对血管生成的协同抑制作用。方法采用24hpf(hour post fertilization,hpf)健康TG(VEGFR2∶GFP)系血管荧光转基因斑马鱼作为实验动物模型,分别用复方苦参注射液、顺铂、以及两药联合处理24h,以节间血管作为考察依据,并用SPSS软件对所得数据进行统计处理。结果顺铂单用时以50,100μg·ml-1浓度抑制节间血管效果明显,复方苦参注射液为0.5%时抑制节间血管效果明显,两者联用时较单用抑制更明显。结论复方苦参注射液与顺铂有一定的抑制血管生成作用,两者联合具有协同增效作用。
基金Supported by the China National Science and Technology Major Project(2016ZX05050)
文摘It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir.To solve this problem,this study proposes to use packers,sealing cannula and other tools in the same horizontal well to inject water in some fractures and produce oil from other fractures.This new energy supplement method forms a segmental synchronous injection-production system in a horizontal well.The method can reduce the distance between the injection end and the production end,and quickly establish an effective displacement system.Changing the displacement between wells to displacement between horizontal well sections,and point water flooding to linear uniform water flooding,the method can enhance water sweeping volume and shorten waterflooding response period.The research shows that:(1)In the synchronous injection and production of horizontal well in an ultra-low-permeability sandstone reservoir,the water injection section should select the section where the natural fractures and artificial fractures are in the same direction or the section with no natural fractures,and the space between two sections should be 60?80 m.(2)In addition to controlling injection pressure,periodic water injection can be taken to reduce the risk of re-opening and growth of natural fractures or formation fracture caused by the gradual increase of water injection pressure with water injection going on.(3)Field tests have verified that this method can effectively improve the output of single well and achieve good economic benefits,so it can be widely used in the development of ultra-low permeability sandstone reservoirs.
