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Zirconia-Polyurethane Aneurysm Clip.

Abstract：

OBJECTIVE:Susceptibility artifacts from metal clips in magnetic resonance (MR) imaging present an obstacle to evaluating the status of clipped aneurysms, parent arteries, and adjacent brain parenchyma. We aimed to develop MR-compatible aneurysm clips. METHODS:Considering the mechanical and biologic properties, as well as MR compatibility of candidate materials, a prototype clip with a zirconia body and a polyurethane head spring (zirconia clip [ZC], straight, 9-mm long) was developed. The closing forces, opening width of blades, and in vitro and in vivo artifact volumes in 3 tesla MR imaging were compared among the prototype and commercial metal clips such as a Yasargil clip (YC, curved type, 8.3-mm long) and a Sugita clip (SC, straight type, 10-mm long). An in vivo animal study was performed with a canine venous pouch aneurysm model. RESULTS:The closing forces (N) at 1 mm and 8 mm from the blade tip were 2.09 and 3.77 in YC, 1.85 and 3.04 in SC, and 2.05 and 4.60 in ZC. The maximum opening widths (mm) was 6.8, 9.0, and 3.0 in YC, SC, and ZC, respectively. The in vitro artifact volumes of YC, SC, and ZC in time-of-flight MR imaging were 26.9, 29.7, and 1.9 times larger than the respective real volumes. The in vivo artifact volumes of YC, SC, and ZC were respectively 21.4, 29.4, and 2.6 times larger than real ones. CONCLUSIONS:ZC showed the smallest susceptibility artifacts and satisfactory closing forces. However, the narrow opening width of the blades was a weak point.

journal_name

World Neurosurg

journal_title

World neurosurgery

authors

Cho WS,Cho KI,Kim JE,Jang TS,Ha EJ,Kang HS,Son YJ,Choi SH,Lee S,Kim CC,Sun JY,Kim HE

doi

10.1016/j.wneu.2018.03.130

subject

Has Abstract

pub_date

2018-07-01 00:00:00

pages

14-23

eissn

1878-8750

issn

1878-8769

pii

S1878-8750(18)30612-0

journal_volume

115

pub_type

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