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. 2003 Aug;24(7):1446-8.

Increasing the packing of small aneurysms with complex-shaped coils: an in vitro study

Michel Piotin  1 , Akira Iijima, Hajime Wada, Jacques Moret
Affiliations

Increasing the packing of small aneurysms with complex-shaped coils: an in vitro study

Michel Piotin et al. AJNR Am J Neuroradiol. 2003 Aug.

Abstract

Nine embolization experiments of a silicone aneurysm model were conducted by using helical and complex-shaped coils. Coils were introduced up to the point when the adjunct of a supplementary coil caused protrusion into the parent vessel. Packing ratios (volume of coils-aneurysm volume) ranged between 31% and 38%. Optimal packing was achieved with complex-shaped coils used in a concentric fashion. The complex-shaped coils allowed a better aneurysm filling than did helical coils.

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Figures

F<sc>ig</sc> 1.
Fig 1.
Packing density and percentage of complex-shaped coils. The linear curve of tendency shows that the use of complex-shaped coils tends to improve the filling of the aneurysm.
F<sc>ig</sc> 2.
Fig 2.
Aneurysm model (nonsubtracted lateral view) at the end of the first experiment (scenario 1) showing that both the sac and the neck are densely packed (packing attenuation, 38%).
F<sc>ig</sc> 3.
Fig 3.
Aneurysm model (nonsubtracted lateral view) at the end of the fifth experiment (scenario 2) showing that both the sac (interstices inside the coil mesh, white arrowheads) and the neck (black arrow) are less packed than on Fig 1 (packing attenuation, 32%).
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