国产房间隔缺损堵塞装置内皮化的实验研究

Animal experimental research of the endothelialization of home-made atrial septal defect occluder device

目的 评价国产房间隔缺损(ASD)堵塞装置的内皮化。方法 选用乳猪6头(平均体重7.5kg),利用穿刺针和Rashkind球囊房隔造口术,建立大小不等ASD动物模型;选择适当大小的国产ASD堵塞装置进行封堵;术后1、3和6个月分别将小猪处死(每次2只),取堵塞装置行扫描电镜检查。结果 术后1个月,装置表面被胶原纤维所覆盖,装置边缘见散在内皮细胞;术后3个月,装置表面大部分被内皮细胞所覆盖,伞尖表面光滑,无内皮细胞覆盖;术后6个月,装置表面完全被内皮细胞所覆盖,伞尖表面光滑并有内皮细胞上爬。结论 国产ASD堵塞装置置入动物体内3个月已大部分内皮化,6个月时已完全内皮化。

Objective To evaluate the endothelialization of Chinese nitinol atrial septal defect occlud-er device. Methods Atrial septal defect with controllable size was created by the Brockenborough needle and Rashkind balloon atrial septostomy, the occluder devices were implanted in six piglets (mean weight 7. 5 kg). Two pigs were killed each time after 1 month, 3 months and 6 months after the device implantation and then the explanted devices were examined by scanning electron microscope (SEM). Results The devices were found covering with collagen fibrosis together with diffuse endothelial cells spreading over the primer 1 month after implantation. The implants were covered mostly by ncointima 3 months after implantation and completely covered by confluent endothelial cells 6 months after the implantation. Endothelial cells were not found on the smooth marker band at 3 months, however, did exist by 6 months. Conclusions Home-made atriatseptal defect occluder devices were mostly endothelialised 3 months after the implantation and did completely at 6 months.