Download PDF
CC BY-NC-ND 4.0 · Asian J Neurosurg 2024; 19(01): 052-057
DOI: 10.1055/s-0043-1760850
Original Article

Relationship between Shape Retention and X-ray Absorption Value of the Tip of Microcatheters in Neuroendovascular Treatment

Tomotaka Ohshima
1   Neuroendovascular Therapy Center, Aichi Medical University, Nagakute, Aichi, Japan
,
Fuminori Ato
2   Department of Neurosurgery, Aichi Medical University, Nagakute, Aichi, Japan
,
Reo Kawaguchi
2   Department of Neurosurgery, Aichi Medical University, Nagakute, Aichi, Japan
,
Naoki Matsuo
2   Department of Neurosurgery, Aichi Medical University, Nagakute, Aichi, Japan
,
Shigeru Miyachi
1   Neuroendovascular Therapy Center, Aichi Medical University, Nagakute, Aichi, Japan
2   Department of Neurosurgery, Aichi Medical University, Nagakute, Aichi, Japan
› Author Affiliations Funding None.
› Further Information
   Permissions and Reprints

Abstract

Objective We noticed that the X-ray absorption value of the tip of each microcatheter used for aneurysm treatment varied from product to product. We hypothesized that the differences were caused by variations in the metal's density braid, which could be related to the ability of the tip to retain its shape.

Methods The X-ray absorption value of each microcatheter tip was measured. Next, heat forming was performed using a shaping mandrel at 6 mm and 90 degrees to determine whether there was a correlation between the X-ray absorption value and the forming angle. Next, the optimal mandrel angle for forming each microcatheter at 90 degrees was investigated. We also examined the shape retention after 20 times wire insertions into each microcatheter.

Conclusion It was found that the higher the X-ray absorption value, the harder it was for the microcatheter to be formed. The mandrel angle required to form 90 degrees was determined by the X-ray absorption value. The higher the X-ray absorption value, the higher the shape retention of the tip shape. The heat formation and shape-retention conditions of the microcatheter tip were correlated with the X-ray absorption value of the metal braid. Even for unknown microcatheters, the optimum shaping conditions can be inferred from the X-ray absorption value.

Keywords

microcatheter - neuroendovascular treatment - retention - shape - X-ray absorption value


Publication History

Article published online:
26 February 2024

© 2024. Asian Congress of Neurological Surgeons. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

Thieme Medical and Scientific Publishers Pvt. Ltd.
A-12, 2nd Floor, Sector 2, Noida-201301 UP, India

 

  • References

  • 1 Abe T, Hirohata M, Tanaka N. et al. Distal-tip shape-consistency testing of steam-shaped microcatheters suitable for cerebral aneurysm coil placement. AJNR Am J Neuroradiol 2004; 25 (06) 1058-1061
    PubMedGoogle Scholar
  • 2 Kiyosue H, Hori Y, Matsumoto S. et al. Shapability, memory, and luminal changes in microcatheters after steam shaping: a comparison of 11 different microcatheters. AJNR Am J Neuroradiol 2005; 26 (10) 2610-2616
    PubMedGoogle Scholar
  • 3 Fujimoto M, Itokawa H, Moriya M, Okamoto N, Sasanuma J. Comparison of shaping properties among 4 microcatheters—shapability into spirals and shape consistency. J Neuroendovasc Ther 2016; 10: 170-175
    CrossrefGoogle Scholar
  • 4 Ohshima T, Miyachi S, Matsuo N, Kawaguchi R, Maejima R, Takayasu M. A novel approach involving a microcatheter tip during aneurysmal coil embolization: the Γ (gamma) tip method. Interv Neuroradiol 2019; 25 (06) 681-684
    CrossrefPubMedGoogle Scholar