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目的:研究一种能高效完成大动脉吻合的新型血管吻合器械,利用磁性吻合技术(MCA)达到快速吻合大动脉的目的。方法:选择成年杂种犬16只,按随机数字表法分为两组:MCA组(
n=8),利用新型磁吻合器械完成吻合;传统手工缝合(HS)组(
n=8)。比较两种方法吻合腹主动脉耗时、吻合口耐压水平、术中渗... 相似文献
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消化道磁性异物病例罕见,患者多为儿童,其致病机理特殊,消化道损害严重.大多数情况下异物可随粪便自行排出而不产生任何并发症.磁性异物,尤其是多个磁性异物和顺磁金属同时误吞时,由于异物可能隔着胃、肠壁互相吸引、压榨引起肠管粘连和扭曲,发生肠梗阻或肠穿孔等严重的消化道损伤,甚至危及患儿生命.对此,我们查阅了关于消化道磁性异物的文献,现分析报告如下. 相似文献
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目的 研究误吞磁性异物病例发生的地理分布和社会环境因素及其对儿童健康的影响.方法 研究了国内外所有以英文和中文发表的关于磁性异物导致消化道损伤的文献,包括发病年龄、性别、国家和地区分布、磁性异物的数量、磁性异物来源、临床诊疗过程.结果 共收集了来自15个国家和地区的79例磁性异物吞咽病例,其中美国发病率最高(49.3%... 相似文献
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背景:普通外科手术中,磁吻合技术以操作简便、吻合迅速、对位准确、吻合质量确定、应用范围广泛等优点备受关注,但磁材料留置体内可能会对机体产生一些不良的影响,生物可降解纳米磁性复合材料有望解决此问题。
目的:研制适用于外科吻合用的生物可降解纳米钕铁硼磁性复合材料,并评价其主要磁性能、体外降解性能。
方法:采用高能球磨法制备纳米钕铁硼微粒,以溶剂挥发法将纳米钕铁硼微粒与生物可降解材料聚乳酸/羟基乙酸共聚物复合(聚乳酸/羟基乙酸共聚物含量分别为2.5%、5%、7.5%、10%、20%、30%、40%、50%),在特定温度(60,80,100,120,140 ℃)、压力(6,8,10,12,14 MPa)条件下,以温压成型工艺压制生物可降解聚乳酸/羟基乙酸共聚物-纳米钕铁硼磁性复合材料,检测其最大磁能积。采用磷酸盐缓冲液恒温振荡浸泡法进行生物可降解聚乳酸/羟基乙酸共聚物-纳米钕铁硼磁性复合材料(聚乳酸与羟基乙酸摩尔比分别为90/10、70/20、50/50)体外降解实验,扫描电镜观察磁体降解前后显微形态结构变化及降解时间与聚乳酸/羟基乙酸共聚物摩尔比的关系。
结果与结论:生物可降解纳米钕铁硼磁性复合材料的磁性能在一定范围内与纳米钕铁硼微粒含量、成型温度及成型压力呈正比,与聚乳酸/羟基乙酸共聚物含量呈反比。在工艺参数为温度120 ℃、压力12 MPa、聚乳酸/羟基乙酸共聚物含量为5%时其磁性能最佳,最大磁能积为45 kJ/m3。生物可降解纳米钕铁硼磁性复合材料在体外的降解过程与聚乳酸/羟基乙酸共聚物内部组分的摩尔比密切相关,降解时间与聚乳酸含量呈正比,与羟基乙酸含量呈反比,聚乳酸与羟基乙酸摩尔比90/10、70/20、50/50组的降解高峰期分别为8,6,4周。中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程全文链接: 相似文献
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磁性压迫腹部大血管血流阻断系统由体内磁阻断单元、体外电磁单元、非顺磁性手术器械组成。该系统在特制的手术床上预置体外电磁单元,当术中需要阻断腹主动脉或下腔静脉时,可将体内磁阻断单元直接置于拟阻断大血管的腹侧,此时体内外磁单元相吸可迅速、直接压迫拟阻断血管,关闭腹腔出血总“阀门”。该系统利用磁性材料非接触性吸力的特点,借助生物医学工程技术,能够实现腹部手术术中迅速控血,该方法直接压迫拟阻断血管,无需分离就能达到血管阻断目的。 相似文献
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目的 应用磁压榨吻合的原理,探索一种新的肠漏一期修补的方法.方法 将24只犬在距Treitz韧带50、100 cm处空肠分别横行切开肠壁约1 cm,建立犬高位、多处肠漏模型,按随机数字表法分为实验组和对照组,每组12只,观察犬肠漏模型的建立情况.肠漏形成48 h后,实验组采用磁通量为2500 G的钕铁硼磁环原位压榨修补漏口,对照组采用丝线缝合修补漏口.观察犬的一般情况,测吻合口渗漏压,肉眼观察吻合口情况并切取吻合口组织行HE和Masson染色,实验组加行X线检查观察磁环位置并记录磁环排出体外的时间.采用两样本t检验分析检测结果.结果 肠漏模型建立48 h后出现严重的腹腔感染.实验组犬肠漏修补全部获得成功,动物能长期存活,磁环在肠漏修补术后6~7 d排出体外;对照组犬存活8只.肠漏修补术后7 d,实验组与对照组犬吻合口渗漏压分别为(134±23)mm Hg(1 mm Hg=0.133 kPa)和(91±18)mm Hg,两组比较,差异有统计学意义(t=3.225,P<0.05);肠漏修补术后14 d,实验组与对照组犬吻合口渗漏压分别为(281±7)mm Hg和(271±21)mm Hg,两组比较,差异无统计学意义(t=0.988,P>0.05).磁环原位压榨修补后肠道的浆肌层和黏膜层愈合良好,吻合口周围炎症反应轻微,胶原纤维含量少,瘢痕增生不明显.结论 在腹腔感染状态下,应用磁通量为2500 G的磁环对犬肠漏进行一期修补是安全可靠的.Abstract: Objective To explore a new method for one-stage repair of the intestinal leakage based on the principle of magnetic compression anastomosis. Methods Twenty-four dogs were randomly divided into experimental group (n = 12) and control group (n = 12) according to random number table. The model of upper and multiple intestinal leakages was established by making transverse incisions of 1 cm in length on the jejunum wall about 50 cm and 100 cm away from the Treitz ligament. Forty-eight hours later, two NdFeB magnetic rings with the magnetic flux of 2500 G were put into the intestine from the leak sites. The leak sites were pressed between the two rings. The ventages in the control group were sutured. The condition of the dogs was observed after the repair of the leakage. The excreting time was recorded, and the leakage pressures of the anastomotic stoma were detected.The positions of the magnetic rings in the experimental group were detected by X ray. Tissues of the anastomotic stoma were processed by hematoxylin eosin and Masson staining. All data were analyzed using the two-sample t test. Results Severe abdominal infection occurred 48 hours after the establishment of the model. All the intestinal leakages in the experimental group were successfully repaired and the dogs survived for a long time. The magnetic rings were excreted six or seven days after the repair. Eight dogs of the control group survived. The leakage pressure of the anastomotic stoma seven days after the repair was (134 ±23)mm Hg (1 mm Hg =0. 133 kPa) in the experimental group and (91 ± 18)mm Hg in the control group, respectively, with a significant difference between the two groups (t = 3.225, P < 0.05). The leakage pressure of the anastomotic stoma 14 days after the repair was (281 ±7)mm Hg in the experimental group and (271 ±21) mm Hg in the control group, respectively, with no significant difference between the two groups (t =0. 988, P > 0.05). Histological observation showed that after the magnetic compression anastomosis, the intestinal muscle and mucosa recovered well, inflammatory reaction was slight and less collagen fiber and scar was formed. Conclusions Application of magnetic ring with the magnetic flux of 2500 G in one-stage repair of the intestinal leakage in the state of severe abdominal infection is safe and reliable. 相似文献