Zirconia-Polyurethane Aneurysm Clip.

Zirconia-Polyurethane Aneurysm Clip.

World Neurosurg. 2018 Mar 27;:

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

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 biological properties, and MR compatibility of candidate materials, a prototype clip with a zirconia body and a polyurethane head spring (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 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.

PMID: 29602010 [PubMed - as supplied by publisher]

https://ift.tt/2Jb2VBU