期刊文献+
共找到12,179篇文章
< 1 2 250 >
每页显示 20 50 100
外伤性白内障Ⅰ期与Ⅱ期人工晶状体植入术的临床疗效比较
1
作者 彭涛 于丹丹 谢美娜 《中华眼外伤职业眼病杂志》 2020年第1期7-11,共5页
目的比较外伤性白内障Ⅰ期与Ⅱ期人工晶状体植入术的疗效。方法前瞻性病例研究。选取中国人民武装警察部队海警总队医院2016年1月至2018年1月单眼外伤性白内障50例为研究对象,随机分为Ⅰ期人工晶状体植入组(28例)及Ⅱ期人工晶状体植入组... 目的比较外伤性白内障Ⅰ期与Ⅱ期人工晶状体植入术的疗效。方法前瞻性病例研究。选取中国人民武装警察部队海警总队医院2016年1月至2018年1月单眼外伤性白内障50例为研究对象,随机分为Ⅰ期人工晶状体植入组(28例)及Ⅱ期人工晶状体植入组(22例),比较两组疗效。结果术后1个月,两组患者视力均优于术前(P<0.05),但两组之间差异无统计学意义(P>0.05)。术后1个月,Ⅱ期组角膜水肿、葡萄膜炎、虹膜后粘连及继发性青光眼发生率均低于Ⅰ期组(P<0.05)。术后1年,Ⅱ期组前房深度、泪膜破裂时间评分高于Ⅰ期组(P<0.05)。Ⅱ期组眼压、角膜荧光染色评分均低于Ⅰ期组(P<0.05)。结论外伤性白内障Ⅱ期人工晶状体植入术并发症发生率较低,远期效果较好。 展开更多
关键词 白内障 外伤性 植入术 晶状体 人工 疗效 临床
髂静脉闭塞支架置入治疗要点精析
2
作者 杨硕菲 薛冠华 《国际外科学杂志》 2020年第3期150-153,共4页
髂静脉闭塞发生率较高,临床多为隐匿性病变。非血栓性髂静脉闭塞是下肢慢性静脉疾病的重要原因,常见有静脉血栓后综合征和非血栓性髂静脉压迫综合征2种。支架置入是髂静脉闭塞的主要治疗手段之一,应严格把握支架置入指征。支架直径合理... 髂静脉闭塞发生率较高,临床多为隐匿性病变。非血栓性髂静脉闭塞是下肢慢性静脉疾病的重要原因,常见有静脉血栓后综合征和非血栓性髂静脉压迫综合征2种。支架置入是髂静脉闭塞的主要治疗手段之一,应严格把握支架置入指征。支架直径合理选择和精准定位是保证髂静脉支架高通畅率的关键技术要点。血管腔内超声对辅助髂静脉闭塞诊断和髂静脉支架置入有重要意义。髂静脉支架置入术后需定期接受超声随访,术后药物治疗方案目前仍有争议。新型髂静脉专用支架的研发及应用有望进一步提高髂静脉支架置入的临床效果。 展开更多
关键词 髂静脉 支架 置入
Observational study of a new modular femoral revision system 预览
3
作者 Karen Dyreborg Michael Mørk Petersen +2 位作者 Sidse Schwartz Balle Anne Grete Kjersgaard Søren Solgaard 《世界骨科杂志(英文版)》 2020年第3期167-176,共10页
BACKGROUND The uncemented ArcosTM Modular Femoral Revision System(ARCOS)is a new comprehensive,press-fit revision design.The modular design offers a wide range of possible combinations to accommodate different variati... BACKGROUND The uncemented ArcosTM Modular Femoral Revision System(ARCOS)is a new comprehensive,press-fit revision design.The modular design offers a wide range of possible combinations to accommodate different variations of anatomy and bone stock.The ARCOS is made by a proximal body and a distal stem.As probably the only ones worldwide we predominantly use a combination of body and stem which supports proximal fixation and load,since this mimics the concept of the primary total hip arthroplasty with proximal weight-bearing,leading to bone stock preservation and no stress shielding or thigh pain.AIM To evaluate the early results after femoral revision in a consecutive series of patients undergoing surgery over 3 years.METHODS We included 116 patients in the study.They were operated in the period August 2011 to December 2014 and we got a clinical mean observation time of 4(0.5-6)years.Clinical and radiographical follow-up included present function of the hip assessed by Harris Hip Score,Oxford Hip Score,and EQ5D(measure of health outcome).Of the 116 patients,17 died in the interim and were consequently included only in the implant survivorship analysis;46 patients attended the follow-up control.RESULTS In total 6(5%)hips were re-revised due to infection(n=3),fracture(n=2)or subsidence(n=1).No patient was re-revised due to aseptic loosening.The 1-,2-and 5-year probability of implant survival(95%CI)were 97%(93%-100%),97%(93%-100%)and 96%(92%-99%),respectively.In this cohort 95 patients received a combination of a proximal broach and a distal curved and slotted stem(BS),aiming for proximal fixation and load bearing;21 patients received a different combination.When comparing these two groups the BS-group had a 5-year implant survival probability(95%CI)of 97%(93%-100%)compared with the group of other combinations with a 5-year implant survival probability(95%CI)of 90%(78%-100%)(P=0.3).Our regression analysis showed that periprosthetic fracture as an indication for the ARCOS operation was the only significant negative ou 展开更多
关键词 Hip prosthesis ARTHROPLASTY IMPLANTATION Replacement arthroplasty Total hip replacements Modular femoral stem
在线阅读 免费下载
Three paternally imprinted regions are sequentially required in prenatal and postnatal mouse development
4
作者 Max Jiahua Li Xiajun Li 《中国科学:生命科学英文版》 SCIE CAS CSCD 2020年第1期165-168,共4页
Reproduction in mammals is primarily through fertilization of the oocytes and sperms generated by the females and males,respectively.Fusion of two haploid genomes leads to formation of the diploid zygotes,which sequen... Reproduction in mammals is primarily through fertilization of the oocytes and sperms generated by the females and males,respectively.Fusion of two haploid genomes leads to formation of the diploid zygotes,which sequentially gives rise to the pre-implantation and post-implantation embryos before live pups are bom.Although asexual reproduction does occur in lower animals such as amphibians,it has never been achieved in mammals before until very recently. 展开更多
关键词 sequentially IMPLANTATION primarily
Total endovascular repair of an intraoperative stent-graft deployed in the false lumen of Stanford type A aortic dissection: A case report 预览
5
作者 Xu-Ran Li Yuan-Hao Tong +3 位作者 Xiao-Qiang Li Chang-Jian Liu Chen Liu Zhao Liu 《世界临床病例杂志》 2020年第5期954-962,共9页
BACKGROUND A 46-year-old male underwent ascending aortic replacement,total arch replacement,and descending aortic stent implantation for Stanford type A aortic dissection in 2016.However,an intraoperative stent-graft ... BACKGROUND A 46-year-old male underwent ascending aortic replacement,total arch replacement,and descending aortic stent implantation for Stanford type A aortic dissection in 2016.However,an intraoperative stent-graft was deployed in the false lumen inadvertently.This caused severe iatrogenic thoracic and abdominal aortic dissection,and the dissection involved many visceral arteries.CASE SUMMARY The patient had pain in the chest and back for 1 mo.A computed tomography scan showed that the patient had secondary thoracic and abdominal aortic dissection.The ascending aortic replacement,total arch replacement,and descending aortic stent implantation for Stanford type A aortic dissection were performed 2 years prior.An intraoperative stent-graft was deployed in the false lumen.Endovascular aneurysm repair was performed to address this intractable situation.An occluder was used to occlude the proximal end of the true lumen,and a covered stent was used to direct blood flow back to the true lumen.A three-dimensional printing technique was used in this operation to guide prefenestration.The computed tomography scan at the 1stmo after surgery showed that the thoracic and abdominal aortic dissection was repaired,with all visceral arteries remaining patent.The patient did not develop renal failure or neurological complications after surgery.CONCLUSION The total endovascular repair for false lumen stent-graft implantation was feasible and minimally invasive.Our procedures provided a new solution for stent-graft deployed in the false lumen,and other departments may be inspired by this case when they need to rescue a disastrous stent implantation. 展开更多
关键词 Type A dissection False lumen stent graft implantation Endovascular repair 3D printing Thoracoabdominal aortic dissection Case report
在线阅读 免费下载
Improvements to the retractor and muscle flap design for minimally invasive cochlear implantation 预览
6
作者 Riyuan Liu Zhiping Tan +5 位作者 Jianan Li Yan Yan Wei Ren Miao Zhang Shiming Yang Hui Zhao 《中华耳科学杂志:英文版》 CSCD 2020年第1期41-44,共4页
Objective: The aim of this study was to improve muscle flaps and to evaluate surgical outcomes with the use of a novel specialized retractor, which is a surgical instrument used to locate and shape a bony seat for min... Objective: The aim of this study was to improve muscle flaps and to evaluate surgical outcomes with the use of a novel specialized retractor, which is a surgical instrument used to locate and shape a bony seat for minimally invasive cochlear implantation.Methods: 50 patients aged 1 e75 years with sensorineural hearing loss who required cochlear implantation were recruited. A small incision(<3 cm) was made, and the novel specialized retractor was used in the study group during cochlear implantation. The incision length, surgical outcomes and operative time were recorded and analyzed.Results: The incision length, total operative time and drilling bony time were shorter in the study group than in the control group(P < 0.05, respectively). All patients recovered well after the surgery without any severe complications.Conclusion: The use of a novel specialized retractor standardized the surgical processes of cochlear implantation. The retractor helped locate and control the size of the bony well during bone drilling. The tool reduced the technical difficulty and improved the efficacy of this minimally invasive operation. 展开更多
关键词 Minimally invasive surgery Cochlear implantation RETRACTOR Muscle flap
在线阅读 下载PDF
微创术不翻瓣技术在口腔种植术中的效果 预览
7
作者 孙中毅 《医学信息》 2020年第2期107-108,共2页
目的分析微创术不翻瓣技术在口腔种植术中的临床效果。方法选择2018年2月~2019年2月在我院进行口腔种植的患者116例,采用随机数字表法分为观察组和对照组,各58例。对照组采用常规翻瓣种植治疗,观察组采用微创术不翻瓣技术治疗,比较两组... 目的分析微创术不翻瓣技术在口腔种植术中的临床效果。方法选择2018年2月~2019年2月在我院进行口腔种植的患者116例,采用随机数字表法分为观察组和对照组,各58例。对照组采用常规翻瓣种植治疗,观察组采用微创术不翻瓣技术治疗,比较两组种植成功率、种植时间、术后疼痛时间、术后肿胀时间、术后牙槽嵴骨吸收量及有效角化黏膜宽度。结果观察组种植成功率(94.83%)高于对照组(81.03%),差异有统计学意义(P<0.05);观察组种植时间(22.67±2.54)min、术后疼痛时间(23.90±5.78)h、术后肿胀时间(36.24±3.72)h分别短于对照组的(40.22±3.87)min、(54.91±4.32)h、(73.20±5.17)h,差异有统计学意义(P<0.05);观察组术后牙槽嵴骨吸收量[(0.15±0.01)mm]少于对照组[(0.20±0.03)mm],有效角化黏膜宽度[(2.87±0.44)mm]宽于对照组[(1.98±0.47)mm],差异均有统计学意义(P<0.05)。结论微创术不翻瓣技术在口腔种植术中应用效果理想,可提高种植成功率,缩短种植时间,且术后恢复快,值得借鉴。 展开更多
关键词 微创术 不翻瓣技术 口腔 种植术
在线阅读 下载PDF
囊袋张力环对悬韧带松弛所致急性闭角型青光眼的治疗效果
8
作者 黄红艳 张旭 《中华眼外伤职业眼病杂志》 2020年第1期26-30,共5页
目的评估超声乳化联合囊袋张力环植入术治疗晶状体悬韧带松弛所致急性闭角型青光眼的效果。方法回顾性分析2016年1月至2018年6月中国人民解放军新疆军区总医院收治的悬韧带松弛所致急性闭角型青光眼120例(120眼)。包括对照组60例(60眼)... 目的评估超声乳化联合囊袋张力环植入术治疗晶状体悬韧带松弛所致急性闭角型青光眼的效果。方法回顾性分析2016年1月至2018年6月中国人民解放军新疆军区总医院收治的悬韧带松弛所致急性闭角型青光眼120例(120眼)。包括对照组60例(60眼),采用晶状体超声乳化联合人工晶状体植入术;观察组60例(60眼),采用晶状体超声乳化联合囊袋张力环植入及人工晶状体植入术。观察两组患者术后的效果。结果术前两组之间眼压、最佳矫正视力及中央前房深度差异均无明显统计学意义(P>0.05);术后随访3个月观察组眼压低于对照组(P=0.000),最佳矫正视力优于对照组(P=0.000);中央前房深度大于对照组(P=0.000);观察组不良反应发生率为1.67%低于对照组的11.67%(P=0.028)。结论超声乳化联合囊袋张力环植入术治疗晶状体悬韧带松弛所致急性闭角型青光眼效果稳定且安全性高。 展开更多
关键词 超声乳化术 植入术 囊袋张力环 青光眼 闭角型 急性
不同交联透明质酸复合凝胶在体内的宿主反应及基质金属蛋白酶9表达 预览
9
作者 聂卫 刘伟伟 +7 位作者 刘大卫 崔晓雪 刘山海 李旭 肖光礼 王世炜 牛换云 李睿智 《中国组织工程研究》 CAS 北大核心 2020年第10期1557-1562,共6页
背景:利用羟丙基甲基纤维素分子内的羟基与透明质酸中的羟基、羧基发生相互作用,可降低透明质酸的酶解,提高其作为皮肤填充材料的可使用性。目的:观察不同交联方式透明质酸复合凝胶体内植入后的宿主反应及基质金属蛋白酶9表达变化。方法... 背景:利用羟丙基甲基纤维素分子内的羟基与透明质酸中的羟基、羧基发生相互作用,可降低透明质酸的酶解,提高其作为皮肤填充材料的可使用性。目的:观察不同交联方式透明质酸复合凝胶体内植入后的宿主反应及基质金属蛋白酶9表达变化。方法:取新西兰大耳白兔(购自北京隆安实验动物养殖中心)12只,在其脊柱两侧皮下共注射10个点,左侧4点注射化学交联透明质酸钠-羟丙基甲基纤维素凝胶(化学交联组),右侧4点注射物理混合透明质酸钠-羟丙基甲基纤维素凝胶(物理交联组),左右侧各一点注射已上市注射用修饰透明质酸钠凝胶(对照组)。注射后1,4,12周分别切取包括植入材料在内的皮下组织,苏木精-伊红染色观察炎症反应和纤维化程度,Masson染色观察胶原纤维形成状况,免疫组织化学染色观察基质金属蛋白酶9表达变化。实验经天津市医药科学研究所动物伦理委员会批准(批准号:IMPS-EAEP-H-2017030)。结果与结论:①苏木精-伊红染色:化学交联组注射后1,4周时的炎症反应较对照组明显,囊壁及微囊壁较对照组增厚,注射后12周时炎症反应及纤维化程度与对照组类似;物理交联组注射后1周时可见少量炎细胞浸润,纤维包裹及微囊壁形成较对照组稍明显,注射后4周时纤维包裹及微囊壁较对照组增厚,注射后12周时炎症反应及纤维化程度与对照组类似;②Masson染色:化学交联组与物理交联组注射后1,4周时的胶原纤维较对照组增多,12周时胶原纤维进一步增加,与对照组无差异;③免疫组织化学染色:化学交联组注射后1周的基质金属蛋白酶9阳性表达低于对照组,其余时间点与对照组无差异;物理交联组注射后1周的基质金属蛋白酶9阳性表达低于对照组,注射后4周的阳性表达高于对照组,注射后12周与对照组无差异;④结果表明:两种交联透明质酸钠复合凝胶皮下植入后12周内的生物� 展开更多
关键词 交联 透明质酸 凝胶 羟丙基甲基纤维素 植入 皮下 宿主反应 金属基质蛋白酶9
在线阅读 下载PDF
Fundamentals of prosthetic urology
10
作者 Kole P Akula Omer A Raheem 《亚洲男性学杂志:英文版》 SCIE CAS CSCD 2020年第1期20-27,共8页
The field of prosthetic urology demonstrates the striking impact that simple devices can have on quality of life.Penile prosthesis and artificial urinary sphincter implantation are the cornerstone procedures on which ... The field of prosthetic urology demonstrates the striking impact that simple devices can have on quality of life.Penile prosthesis and artificial urinary sphincter implantation are the cornerstone procedures on which this specialty focuses.Modern research largely concentrates on decreasing the rates of complication and infection,as the current devices offer superior rates of satisfaction when revision is not necessary.These techniques are also able to salvage sexual function and continence in more difficult patient populations including female-to-male transgender individuals,those with ischemic priapism,and those with erectile dysfunction and incontinence secondary to prostatectomy.This review summarizes modern techniques,outcomes,and complications in the field of prosthetic urology. 展开更多
关键词 IMPLANTATION penile prosthesis prosthetic urology
Ten-year follow-up of a trancatheter double Corevalve aortic valve implantation 预览
11
作者 Vasileios Kamperidis Maria Vlachou +2 位作者 Georgios Sianos Stavros Hadjimiltiadis Haralambos Karvounis 《老年心脏病学杂志:英文版》 SCIE CAS CSCD 2020年第3期175-176,共2页
During the last decade,transcatheter aortic valve implantation(TAVI)for severe aortic stenosis has evolved as an alternative to surgical replacement in cases with high surgical risk.[1]However,long-term survival data ... During the last decade,transcatheter aortic valve implantation(TAVI)for severe aortic stenosis has evolved as an alternative to surgical replacement in cases with high surgical risk.[1]However,long-term survival data are scarce and information about TAVI durability is lacking.[2]Hereby,we report the degeneration of the first TAVI performed in Northern Greece which happened to be a double implantation of a CoreValve device,10 years later. 展开更多
关键词 ECHOCARDIOGRAPHY Heart failure Transcatheter aortic valve implantation
在线阅读 下载PDF
Delayed right coronary ostial obstruction after J-valve deployment in transcatheter aortic valve implantation:A case report 预览
12
作者 Zhao Xu Hong Yu Peng Liang 《世界临床病例杂志》 2020年第4期815-819,共5页
BACKGROUND Aortic stenosis is the most common valve disease in adults.Transcatheter aortic valve implantation(TAVI)is being increasingly applied for intermediate-to lowrisk patients.Here,we describe an uncommon compli... BACKGROUND Aortic stenosis is the most common valve disease in adults.Transcatheter aortic valve implantation(TAVI)is being increasingly applied for intermediate-to lowrisk patients.Here,we describe an uncommon complication of delayed right coronary obstruction in a transapical TAVI case.CASE SUMMARY A 73-year-old woman with a EuroSCORE II of 1.21%underwent transapical TAVI because of severe aortic stenosis.The surgical procedure was uneventful.However,during routine monitoring after valve placement,the patient had a sudden onset of slow heart rate,the systolic blood pressure dropped sharply from 115 to 60 mmHg,and the central venous pressure abruptly increased from 10 to 33 cmH2O.The patient had a poor response to vasoactive agents.Transesophageal echocardiography revealed poor myocardial contractility,and electrocardiography showed a significant depression of ST-segment.Another angiography was performed immediately,which suggested complete obstruction of the right coronary artery.An emergency protocol was initiated.Cardiopulmonary bypass was established immediately.An aortic biological valve replacement under cardiopulmonary bypass was performed.CONCLUSION Perioperative monitoring,early recognition,and diagnosis of obstruction of coronary arteries in TAVI are important.Transesophageal echocardiography is a useful diagnostic and monitoring tool in this situation.Emergency protocols should be established during TAVI. 展开更多
关键词 Transcatheter aortic valve implantation Right coronary artery OBSTRUCTION COMPLICATION Management Case report
在线阅读 免费下载
上颌窦底冲顶提升法与CAS-KIT工具提升法在上颌窦底提升术并同期种植患者的应用比较 预览
13
作者 席云昊 卜寿山 《东南国防医药》 2020年第2期133-137,共5页
目的分析上颌窦底冲顶提升法与CAS-KIT(crestal approach-sinus kit)工具提升法在上颌窦底提升术(OSFE并同期种植患者的应用。方法回顾性分析2016年12月至2018年12月在南京医科大学第一附属医院接受OSFE并同期种植的99例患者临床资料,按... 目的分析上颌窦底冲顶提升法与CAS-KIT(crestal approach-sinus kit)工具提升法在上颌窦底提升术(OSFE并同期种植患者的应用。方法回顾性分析2016年12月至2018年12月在南京医科大学第一附属医院接受OSFE并同期种植的99例患者临床资料,按OSFE术式分为3组,其中33例采用上颌窦底冲顶提升(冲顶组),35例采用CAS-KIT工具提升(CAS-KIT组),31例采用上颌窦底冲顶联合CAS-KIT工具提升(联合组)。比较3组种植系统、种植体数、愈合方式、术前后骨高度及提升幅度、种植失败及并发症发生率。结果 99例患者共计植入134枚种植体,其中40例植入53枚Osstem种植体,47例植入63枚Dentium种植体,12例植入18枚Nobel Guide种植体,3组植骨数量、种植系统、种植体数比较差异无统计学意义(P>0.05);冲顶组、CAS-KIT组、联合组中潜入式缝合例数分别为22例(66.67%)、20例(57.14%)、22例(70.97%),其余为非潜入式缝合,3组愈合方式比较差异无统计学意义(P>0.05);3组术后骨高度较术前均显著提升,CAS-KIT组、联合组术后骨高度及提升幅度均显著高于冲顶组(P<0.05),但CAS-KIT组与联合组术后骨高度及提升幅度比较差异无统计学意义(P>0.05);联合组未见种植失败及并发症发生,冲顶组种植失败位点数、术中穿孔、术后上颌窦炎及耳石症发生率分别为4.54%、9.09%、2.27%、2.27%,CAS-KIT组为6.25%、6.25%、2.08%、2.08%,但3组种植失败及并发症发生率比较差异无统计学意义(P>0.05)。结论较颌窦底冲顶提升法,CAS-KIT工具提升法或两种提升方式联合应用在提升骨高度上优势更显著,但联合应用具有更高的种植成功比例及更低的并发症风险,值得临床重视。 展开更多
关键词 上颌窦底冲顶提升法 CAS-KIT工具提升法 上颌窦底提升术 种植
在线阅读 下载PDF
Long-term follow-up of auditory performance and speech perception and effects of age on cochlear implantation in children with pre-lingual deafness
14
作者 Jing Lyu Ying Kong +6 位作者 Tian-Qiu Xu Rui-Juan Dong Bei-Er Qi Shuo Wang Yong-Xin Li Hai-Hong Liu Xue-Qing Chen 《中华医学杂志:英文版》 SCIE CAS CSCD 2019年第16期1925-1934,共10页
Background: The development of auditory and speech perception ability of children with hearing loss is affected by many factors after they undergo cochlear implantation (CI). Age at CI (CI age) appears to play an impo... Background: The development of auditory and speech perception ability of children with hearing loss is affected by many factors after they undergo cochlear implantation (CI). Age at CI (CI age) appears to play an important role among these factors. This study aimed to evaluate the development of auditory and speech perception ability and explore the impact of CI age on children with pre-lingual deafness present before 3 years of age. Methods: Two hundred and seventy-eight children with pre-lingual deafness (176 boys and 102 girls) were included in this study, and the CI age ranged from 6 to 36 months (mean age, 19 months). Categorical auditory performance (CAP) was assessed to evaluate auditory ability, and the speech intelligibility rating was used to evaluate speech intelligibility. The evaluations were performed before CI and 1, 3, 6, 12, 18, 24, 36, 48, and 60 months after CI. Results: The auditory ability of the pre-lingually hearing-impaired children showed the fastest development within 6 months after CI (k = 0.524, t = 30.992, P < 0.05);then, the progress started to decelerate (k = 0.14, t = 3.704, P < 0.05) and entered a plateau at the 24th month (k = 0.03, t = 1.908, P < 0.05). Speech intelligibility showed the fastest improvement between the 12th and 24th months after CI (k = 0.138, t = 5.365, P < 0.05);then, the progress started to decelerate (k = 0.026, t = 1.465, P < 0.05) and entered a plateau at the 48th month (k = 0.012, t = 1.542, P < 0.05). The CI age had no statistical significant effect on the auditory and speech abilities starting at 2 years after CI (P > 0.05). The optimal cutoff age for CI was 15 months. Conclusions: Within 5 years after CI, the auditory and speech ability of young hearing-impaired children continuously improved, although speech development lagged behind that of hearing. An earlier CI age is recommended;the optimal cutoff age for CI is at 15 months. 展开更多
关键词 Categorical AUDITORY performance Speech intelligibility rating COCHLEAR IMPLANTATION Children Pre-lingual DEAFNESS Age at COCHLEAR IMPLANTATION
GBR植骨效果的远期稳定性不优于自体骨移植 预览
15
作者 刘鑫 周咏 +3 位作者 汪洋 孙雅慧 刘东升 何家才 《口腔医学》 CAS 2019年第1期63-65,共3页
引导性骨再生术(GBR)的应用缺陷包括:屏障膜容易塌陷、吸收,不可吸收膜需要二次手术取出,容易早期暴露导致不理想的骨再生。膜的放置过程中容易导致颗粒状骨粉的移位和扩增位点凸度的丧失。尤其在不易维持成骨空间的骨缺损类型中,GBR在... 引导性骨再生术(GBR)的应用缺陷包括:屏障膜容易塌陷、吸收,不可吸收膜需要二次手术取出,容易早期暴露导致不理想的骨再生。膜的放置过程中容易导致颗粒状骨粉的移位和扩增位点凸度的丧失。尤其在不易维持成骨空间的骨缺损类型中,GBR在骨再生能力上往往具有不可预期性。因为传统的骨替代材料仅具有骨传导性而没有骨引导性,屏障膜在缺损形态不佳时难以维持一个稳定的骨再生空间。块状自体骨移植相对于使用颗粒状骨替代材料的GBR的优势在于:具备良好的成骨特性和生物机械性能。即使在不易维持成骨空间的骨缺损类型中,块状自体骨移植也能提供新骨形成改建所必需的骨源细胞,理想的外形重塑以及良好抗微动和抗吸收特性。我方观点:GBR植骨效果的远期稳定性不优于自体骨移植。 展开更多
关键词 种植 骨增量 自体骨移植 引导性骨再生 远期稳定性
在线阅读 下载PDF
硅胶带植入治疗青光眼阀机化包裹的新方法
16
作者 王贝贝 李秋明 王梦华 《中华眼外伤职业眼病杂志》 2019年第8期602-606,共5页
目的观察硅胶带植入术治疗青光眼引流阀植入术后滤过泡机化包裹的新方法。方法回顾性分析本院2017年4月至2019年5月经结膜滤过泡囊壁切开行硅胶带植入术治疗Ahmed青光眼阀机化包裹导致的高眼压10例(10眼)的临床资料。术后随访2~23个月,... 目的观察硅胶带植入术治疗青光眼引流阀植入术后滤过泡机化包裹的新方法。方法回顾性分析本院2017年4月至2019年5月经结膜滤过泡囊壁切开行硅胶带植入术治疗Ahmed青光眼阀机化包裹导致的高眼压10例(10眼)的临床资料。术后随访2~23个月,平均(10.10±8.21)个月。结果眼压升高者术后5天1例,术后3个月2例,术后6个月2例,余5例在随访期间内眼压保持在6.5~21.0 mmHg之间(1 mmHg=0.133 kPa)。10例末次随访眼压均较术前眼压明显降低,差异有统计学意义(P<0.05)。术后所有患者均未发现引流阀移位、硅胶带移位暴露、巩膜坏死或眼球运动障碍等严重的并发症。结论硅胶带植入治疗青光眼阀机化包裹手术操作简单,效果显著,术后并发症少。 展开更多
关键词 引流 青光眼 植入术 硅胶 眼压
Formation of Vacancy-Type Dislocation Loops in Hydrogen-Ion-Implanted Fe–Cr Alloy
17
作者 Yu-Feng Du Li-Juan Cui +1 位作者 Wen-Tuo Han Fa-Rong Wan 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第5期566-572,共7页
Fe-10 at.%Cr alloy was implanted with hydrogen ions at room temperature, followed by annealing at high temperatures.The annealing process made the defects develop into large dislocation loops. The nature of the disloc... Fe-10 at.%Cr alloy was implanted with hydrogen ions at room temperature, followed by annealing at high temperatures.The annealing process made the defects develop into large dislocation loops. The nature of the dislocation loops formed after annealing was studied by the evolution of loops under in situ electron irradiation in high-voltage electron microscope.It indicated that only interstitial-type loops were observed when annealed at 550℃ and below, but vacancy-type loops started to form at the temperature higher than 600℃. According to the previous study of our group, the presence of chromium element made the formation temperature of vacancy-type loops higher than that in pure iron. The effect of alloying elements on the formation temperature of the vacancy-type loops was discussed. 展开更多
关键词 Hydrogen implantation Interstitial-type LOOPS Vacancy-type LOOPS Fe–Cr ALLOY High-voltage electron microscope
张应变GaInP量子阱结构变温光致发光特性 预览
18
作者 林涛 宁少欢 +4 位作者 李晶晶 张天杰 段玉鹏 林楠 马骁宇 《光子学报》 EI CAS CSCD 北大核心 2019年第1期51-56,共6页
对张应变GaInP量子阱激光器材料结构开展变温光致发光特性的研究,实验中激光器有源区为9nmGa0.575In0.425P量子阱结构,采用N离子注入并结合730℃下的快速热退火处理来诱导有源区发生量子阱混杂.变温(10K~300K)光致发光特性研究表明:300K... 对张应变GaInP量子阱激光器材料结构开展变温光致发光特性的研究,实验中激光器有源区为9nmGa0.575In0.425P量子阱结构,采用N离子注入并结合730℃下的快速热退火处理来诱导有源区发生量子阱混杂.变温(10K~300K)光致发光特性研究表明:300K时,只进行快速热退火或者N离子注入的样品不发生峰值波长蓝移,N离子注入后样品在退火时发生波长蓝移,且蓝移量随退火时间的增加而增加;低温条件时,不同样品的光致发光特性差别较大,光致发光谱既有单峰,也有双峰,分析认为双峰中的短波长发光峰为本征激子的复合,长波长发光峰是由于有序区域中的电子与无序区域中的空穴复合引起.本研究可为半导体激光器长期工作可靠性和材料低温特性的相互关系提供一种新的研究思路. 展开更多
关键词 量子阱混杂 离子注入 低温PL谱 蓝移 张应变
在线阅读 免费下载
24h动态心电图在心律失常诊断中的应用 预览 被引量:1
19
作者 鞠伟伟 《中国卫生标准管理》 2019年第9期89-90,共2页
目的探究常规12导联心电图与24h动态心电图在起搏器植入后心律失常诊断中的应用。方法选取82例2017年11月—2018年12月医院接收的起搏器植入手术治疗患者,作为研究对象。使用电脑尾数单双号的形式,分为观察组(41例)与对照组(41例)两组... 目的探究常规12导联心电图与24h动态心电图在起搏器植入后心律失常诊断中的应用。方法选取82例2017年11月—2018年12月医院接收的起搏器植入手术治疗患者,作为研究对象。使用电脑尾数单双号的形式,分为观察组(41例)与对照组(41例)两组。对照组使用的是常规心电图监测方式,观察组使用的是24h动态心电图监测方式。对比观察组与对照组心律失常检出例数、冠心病阳性检出例数。结果观察组心律失常检出的概率为100.00%,明显高于对照组60.98%,两组数据差异展现统计学意义(P<0.05)。观察组冠心病阳性检出的概率73.17%与对照组70.73%对比,无明显的差异,不具备统计学意义(P>0.05)。观察组室性期前收缩、室早二/三联律、房性期前收缩、短阵房速、束支传导阻滞、房室传导阻滞的检测结果全部明显的高于对照组,两组数据差异展现统计学意义(P<0.05)。结论24h动态心电图诊断起搏器植入患者心律失常检出的概率更高,精确度、敏感度、安全性、可靠性更强,值得被临床应用和推荐。 展开更多
关键词 常规12导联心电图 24H动态心电图 起搏器 植入 心律失常 应用
在线阅读 下载PDF
不植骨上颌窦内提升种植的5年临床效果观察 预览
20
作者 宋磊 李树春 代玮 《中国实验诊断学》 2019年第2期197-199,共3页
目的评价不植骨上颌窦内提升种植的临床效果。方法收集北京大学深圳医院口腔医学中心种植科2012年1-6月完成的不植骨上颌窦内提升种植病人14例,患者上颌后牙区均存在不同程度的牙槽嵴高度不足,采用上颌窦内提升术提高窦底高度后不植骨... 目的评价不植骨上颌窦内提升种植的临床效果。方法收集北京大学深圳医院口腔医学中心种植科2012年1-6月完成的不植骨上颌窦内提升种植病人14例,患者上颌后牙区均存在不同程度的牙槽嵴高度不足,采用上颌窦内提升术提高窦底高度后不植骨同期植入19枚种植体。结果所有患者均完成最终修复,种植体愈合良好。5年后回访种植体留存率100%,功能行使良好,平均提升高度2.72mm(2.19-3.52mm),窦底有一定程度的新生骨,5年后平均新生骨高度1.38mm(0.98-2.92mm)。结论在提升高度不大于3mm同时能获得较为理想初期稳定性的条件下不植骨上颌窦内提升术可取得较好的临床治疗效果。 展开更多
关键词 上颌窦底内提升 不植骨 种植
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈