[Microcatheter User's Manual].

Area of Science:

• Neurosurgery
• Interventional Neuroradiology
• Biomedical Engineering

Background:

• Intrasaccular coil embolization is the primary treatment for ruptured aneurysms.
• Microcatheters (MCs) are crucial for procedural success in aneurysm treatment.
• Flow diverter stents are more common for unruptured aneurysms.

Purpose of the Study:

• To provide a comprehensive overview of microcatheter (MC) mechanical properties, specifications, and selection criteria.
• To focus on manual shaping techniques for MCs, including novel methods for complex cases.
• To enhance neurointerventionists' understanding for safer and more effective aneurysm treatment.

Main Methods:

• Detailed review of MC mechanical properties (stiffness/flexibility balance).
• Comparison of shape-memory capabilities and durability of commercially available MCs using heat-gun and steam processing.
• Introduction of practical "spiral shaping" techniques for paraclinoid aneurysms.

Main Results:

• Experimental data comparing shape-memory and durability of various MCs were presented.
• "Spiral shaping" methods for complex paraclinoid aneurysms were introduced.
• Decision-making strategies for intraoperative MC repositioning were discussed.

Conclusions:

• Mastery of MC mechanics and shaping techniques is vital for neurointerventionists.
• Optimal MC selection and manipulation lead to improved coil distribution and treatment outcomes.
• This article serves as a practical guide for neurointerventionists in Japan and beyond.