title: Microcoil embolization through a downsized coaxial catheter system: an experimental study.
abstract: BACKGROUND
  Most of the recently developed microcatheters for abdominal angiography still have large diameters at their trailing ends, and thus cannot be used for microcoil embolization in combination with a 3-French (F) system.
  
  
  OBJECTIVE
  To evaluate the in vitro passage of microcoils through a newly developed 2-F microcatheter (Meister Cath Superselective Plus, MC6) that is compatible with a downsized coaxial catheter system (3-F system) in an experimental study.
  
  
  METHODS
  We evaluated the passage of microcoils through MC6 within a blood vessel model using the saline flush technique. Six types of microcoils and 17 size variations (maximal curled diameter 2-10 mm, total length 20-140 mm) were used. We evaluated the passage and post-deployment shape of the microcoils as well as the volume of saline required to flush them.
  
  
  RESULTS
  In the experimental study, all microcoils passed through the MC6 and deployed in a satisfactory manner without catheter occlusion. The mean volumes of saline required to flush the TORNADO (n=1), Reverse TORNADO (n=6), HILAL (n=1), Micronester (n=3), VortX (n=4), and C-Stopper Coil (n=2) were 0.7 ml, 0.58+/-0.20 ml, 0.5 ml, 0.57+/-0.058 ml, 3.5+/-1.5 ml, and 0.70+/-0.14 ml, respectively. There was a statistically significant difference in the mean volume of saline required between the VortX and Reverse TORNADO (P=0.029), and between the VortX and C-Stopper Coil (P=0.031). The VortX required the greatest volume of saline.
  
  
  CONCLUSIONS
  Microcoil embolization through a 3-F system appears to be feasible for the coils examined in this study.
authors.affiliation: Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. ttajima@med.kyushu-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Tajima
authors.forename: K
authors.initials: K
authors.lastname: Yoshimitsu
authors.forename: H
authors.initials: H
authors.lastname: Irie
authors.forename: A
authors.initials: A
authors.lastname: Nishie
authors.forename: M
authors.initials: M
authors.lastname: Hirakawa
authors.forename: K
authors.initials: K
authors.lastname: Ishigami
authors.forename: Y
authors.initials: Y
authors.lastname: Ushijima
authors.forename: D
authors.initials: D
authors.lastname: Okamoto
authors.forename: H
authors.initials: H
authors.lastname: Honda
mesh_terms: D000792:Angiography / Q000295:instrumentation; D002404:Catheterization / Q000295:instrumentation*; D004621:Embolization, Therapeutic / Q000295:instrumentation*; D004867:Equipment Design; D005240:Feasibility Studies; D066298:In Vitro Techniques; D008954:Models, Biological; D012965:Sodium Chloride
chemical_list: D012965:Sodium Chloride