Audrey Fohlen1, Julien Namur2, Homayra Ghegediban2, Alexandre Laurent3, Michel Wassef4, Jean-Pierre Pelage5,6. 1. Normandie University, UNICAEN, CEA, CNRS, ISTCT-CERVOxy, 14000, Caen, France. 2. Archimmed, 12 rue Charles de Gaulle, 78350, Jouy-en-Josas, France. 3. Department of Neuroradiology, Hôpital Lariboisière, Université Paris, 7 rue Ambroise Paré, 75475, Paris Cedex 10, France. 4. Department of Pathology, Hôpital Lariboisière, Université Paris, 7 rue Ambroise Paré, 75475, Paris Cedex 10, France. 5. Normandie University, UNICAEN, CEA, CNRS, ISTCT-CERVOxy, 14000, Caen, France. pelage-jp@chu-caen.fr. 6. Archimmed, 12 rue Charles de Gaulle, 78350, Jouy-en-Josas, France. pelage-jp@chu-caen.fr.
Abstract
OBJECTIVES: To angiographically compare the occlusive effects of hydrocoils and fibered coils in the renal and internal iliac arteries at 24 h and 7 days in the sheep model. To determine the occlusive mechanism by hydrocoils and fibered coils by pathological examination. MATERIALS AND METHODS: Two types of peripheral hydrogel-coated and fibered coils similar in diameter and length were compared. The right and left renal arteries were embolized with 0.018-inch detachable hydrocoils or fibered coils in six sheep. Then, the right and left internal iliac arteries were embolized with 0.035-inch pushable hydrocoils or fibered coils. Arterial recanalization was evaluated at 24 h and at 7 days with angiography. At pathology, the surface percentage of thrombus and embolic material (platinum, Dacron fibers and hydrogel) and the presence of inflammation were assessed. RESULTS: No difference was found between the coils for recanalization at 24 h or 7 days. For hydrocoils, the surface of occlusion corresponded to thrombus for 42% and coil for 58% including 42% of platinum and 16% of hydrogel, respectively. For fibered coils, the surface of occlusion was composed of thrombus for 69% and of platinum and fibers for 31%. The surface percentage occupied by thrombus was significantly lower for hydrocoils than for fibered coils (p = 0.0047). The surface percentage of embolic was also different between the two products (p = 0.049). No degradation of hydrogel was found at any time points. CONCLUSION: The percentage of thrombus was significantly less with hydrocoils as compared to fibered coils, which may account for reduced long-term recanalization.
OBJECTIVES: To angiographically compare the occlusive effects of hydrocoils and fibered coils in the renal and internal iliac arteries at 24 h and 7 days in the sheep model. To determine the occlusive mechanism by hydrocoils and fibered coils by pathological examination. MATERIALS AND METHODS: Two types of peripheral hydrogel-coated and fibered coils similar in diameter and length were compared. The right and left renal arteries were embolized with 0.018-inch detachable hydrocoils or fibered coils in six sheep. Then, the right and left internal iliac arteries were embolized with 0.035-inch pushable hydrocoils or fibered coils. Arterial recanalization was evaluated at 24 h and at 7 days with angiography. At pathology, the surface percentage of thrombus and embolic material (platinum, Dacron fibers and hydrogel) and the presence of inflammation were assessed. RESULTS: No difference was found between the coils for recanalization at 24 h or 7 days. For hydrocoils, the surface of occlusion corresponded to thrombus for 42% and coil for 58% including 42% of platinum and 16% of hydrogel, respectively. For fibered coils, the surface of occlusion was composed of thrombus for 69% and of platinum and fibers for 31%. The surface percentage occupied by thrombus was significantly lower for hydrocoils than for fibered coils (p = 0.0047). The surface percentage of embolic was also different between the two products (p = 0.049). No degradation of hydrogel was found at any time points. CONCLUSION: The percentage of thrombus was significantly less with hydrocoils as compared to fibered coils, which may account for reduced long-term recanalization.