SIR 2024
Embolization
Hannah R. Curtis, BS
Medical Student
Loma Linda University
Financial relationships: Full list of relationships is listed on the CME information page.
Marissa Chang, BS
Medical Student
Loma Linda University School of Medicine
Disclosure information not submitted.
Jason C. Smith, MD
Faculty
Loma Linda University Medical Center
Financial relationships: Full list of relationships is listed on the CME information page.
Roger Tomihama, MD
Associate Professor of Radiology
Loma Linda University Medical Center
Disclosure information not submitted.
Kyle J. Cooper, MD, RPVI
Associate Professor
Loma Linda University
Disclosure information not submitted.
Daniel Jin, M.D.
Assistant Professor
Loma Linda University Medical Center
Disclosure information not submitted.
Compare various attributes of endovascular microcoils from different leading manufacturers.
Materials and Methods:
3 mm, 6 mm, and 10 mm endovascular coils of similar lengths from Terumo, Medtronic, Boston Scientific, and Penumbra were tested. Six board-certified interventional radiologists were blinded to evaluate smoothness/softness, force of deployment, and force of retraction of the coils in a vascular model using a 11-point Likert-scale. Coils were then objectively assessed using a force meter to determine softness, force of deployment, force of retraction, force of detachment failure, and radial force.
Results: Likert scale data did not show reliability (ICC< .5) in the subjective rating of smoothness/softness, force of deployment, and force of retraction between interventional radiologists. Analysis of objective data via ANOVA showed statistical differences in softness, force of deployment, and force of retraction when pooled according to the coil types and separated (p< .001). Significant association (p< .05) was present between manufacturer and force of detachment failure. Average force of detachment failure was 1075 millinewtons (mN) for Terumo coils, 1171 mN for Medtronic, 1628 mN for Boston Scientific, and 2231 mN for Penumbra. Boston Scientific coils required larger force for detachment mechanism failure when compared to Medtronic and Terumo coils (p< .05). 3 mm Medtronic coils demonstrated less radial force compared to all other coil manufacturers (p< .001) with no significant difference between Medtronic coil types (p >.05).
Conclusion: The softest of the coils tested were the Medtronic coils. Interlock 2D and Ruby Standard were the hardest of the coils tested. Different coils from various manufacturers have their unique properties that make up its softness, force of deployment/retraction, force of detachment failure, and radial force which can be useful in specific clinical scenarios.