可回收Z型自胀式金属支架的实验研究

Development of a Retrievable Expandable Metallic Stentz and Its Experimental Study

现有的金属支架一旦在血管和管腔脏器中留置后便不能取出。为了解决此问题,作者制作了Z 型自胀式可回收型支架。不锈钢丝弯成有12个顶点的 Z 型,一侧的顶部弯成小环状,然后用手术尼龙线串连。相邻支架的连接是由支架顶部两两连接在一起。回收器具包括不锈钢钩子,旋转手柄,长鞘和聚四氟乙烯棒。支架在狗下腔静脉内留置时间为1、2、3、4周,3个月和1年。所有支架都成功的留置,未见狭窄,未见血栓形成。支架在下腔静脉内留置一周后均能用回收器具取出,回收支架时血管内膜的撕伤一周可恢复,支架留置两周以上则不能取出。实验表明可回收支架使用上是安全的,考虑可在临床方面的应用.

The common metallic stents can not be removed from vessels or ducts after placement,in order to solve this problem,a new stem:The retrievable expandable metallic stem(REMS)has been deviced.The stainless steel wire was made into a cylinder with 12 zigzag bends.One side of the bends was turned into around loop,then connected by the nylon suture.Every two bends from neighbouring stents were connected.The retrieval set consists of a stainless steel hook with a rotating handle,long sheath and a Teflon rod.One, two,three,four weeks,three months and one year for the placement of the stents in IVC of dogs,using the retrieval set tried to remove them.All stents were successfully placed ana no stenosis,no thrombus formation could be fonnd after stenting.The stents can be removed from IVC successfully one week later.The tearing of the endothelium which occurred while removing stent could be repaired in one week.The stents can not be removed more than two weeks after placement,because the stent's wire was encased completely by the proliferation of endothelium.The retrievable expandable metallic stem is considered useful and safe in clini- cal application.