Abstract
Purpose: A novel bioactive coil material, which is composed of a bare platinum core coated with an ultrathin layer of 50/50 acidified PGLA was developed for the purpose of accelerating thrombus organization in the treated aneurysms. Experimental aneurysms were with the coils with novel bioactive coating and histologic analysis was performed. The results were compared with the histologic findings observed in the aneurysms treated with a currently available polymeric coil (Matrix II) and bare platinum coils (GDC). Materials and Methods: A swine aneurysm model, which is designed to perform quantitative analysis of histologic changes induced by the implanted coil materials, was used in this study. The novel bioactive coils, which is composed of a bare platinum core covered with an ultrathin - micron level - polymer coating composed of acidified 50/50 polyglicolic-polylactic acid (PGLA) was implanted in 4 experimental swine aneurysms (group A). Four aneurysms were treated with Matrix II® (group B) and 4 were treated with GDCs (group C). Fourteen days after the implantation, each aneurysm was harvested and histologic analysis of each sample was performed. Results: Histologic findings showed the most advanced thrombus organization - characterized by dense collagen deposition and prominent fibroblast migration - was observed in aneurysms of group A, followed by group B and C. The most prominent inflammatory reaction adjacent to the coil material at Day 14 was seen in group B, followed by group A and group C. However, group A showed a high degree of collagen organization with little immature thrombus remaining, indicative of late stage aneurysm healing. Conclusion: The novel bioactive coil material with ultrathin acidified 50/50 PGLA coating may accelerate the thrombus organization in the experimental aneurysms as compared to the currently available coil materials for brain aneurysm treatment.
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