Vascular embolization of radiopaque hydrogel microfiber using ultra-minimally invasive technique for stage-adjustable renal failure model

Naoki Takakura, Hiroki Ohta, Teppei Komatsu, Yuta Kurashina, Yuya Hiroka, Hirotaka J. Okano, Hiroaki Onoe

Research output: Contribution to journalArticlepeer-review

Abstract

Animal pathology models play an important role in elucidating pathology, evaluating drug efficacy, and studying therapeutic. This paper presents the creation of rats’ renal failure model by embolizing the renal artery using radiopaque hydrogel microfibers. By using a dual coaxial laminar flow microfluidic device, barium alginate gel microfibers containing zirconia particles were fabricated. Since the zirconia particles are radiopaque, the microfiber can be delivered and embolized while confirming the position of the microfiber in real-time under X-ray imaging. The delivery of microfibers through a catheter into the renal artery of rats to create a renal failure model was tested. The radiopaque microfibers were visualized by X-ray imaging when delivered by a catheter. Furthermore, the microfibers remained stable for 2 weeks after delivery. In addition, by adjusting the number of microfibers, two different rat models with severe and mild renal failure conditions were created. The proposed delivery of radiopaque hydrogel microfibers to create an embolization model is expected to be an effective approach to control the degree of symptoms and elucidate the pathology.

Original languageEnglish
Article number110802
JournalMaterials and Design
Volume219
DOIs
Publication statusPublished - 2022 Jul

Keywords

  • Barium alginate hydrogel
  • Catheter
  • Microfiber
  • Radiopaque embolization
  • X-ray

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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