Cerebral Aneurysm Coiling
Endovascular treatment of intracranial aneurysms — platinum coils packed into the aneurysm sac via microcatheter under biplane fluoroscopic and 3D rotational angiography guidance. Largely replaced open surgical clipping for most aneurysms amenable to endovascular approach since the ISAT trial (2002) demonstrated better outcomes for coiling in subarachnoid hemorrhage. Adjuncts include stent-assisted coiling, balloon remodeling, and flow diverters (Pipeline, Surpass) for giant / fusiform / wide-neck lesions.
Clinical pathway
- Femoral or radial access — large-bore sheath, heparinization.
- Diagnostic angiography — bilateral carotids + vertebrals, 3D rotational runs to characterize aneurysm neck, dome, daughter sacs.
- Microcatheter navigation — coaxial system advanced through guide catheter into the aneurysm sac.
- Coil deployment — detachable platinum coils sized to aneurysm; framing coil first, then filling and finishing coils.
- Adjuncts if needed — stent-assisted coiling for wide-neck aneurysms, balloon remodeling, flow diverters for giant or fusiform lesions, intrasaccular devices (WEB).
- Final runs + closure — document occlusion (Raymond-Roy classification), manage access site.
Typical systems
- Philips Azurion 7 biplane
- Philips Allura Xper FD10/20 biplane
- Siemens Artis Q biplane
- Siemens Artis zee biplane
- GE Innova 4100-IQ biplane
Biplane is essential — two orthogonal projections simultaneously halve procedure time, contrast, and dose compared to single-plane for a complex 3D vascular structure.
Room + procedure characteristics
- Procedure time: 90 min to 4+ hours depending on aneurysm morphology and rupture status.
- Team: neurointerventionalist + neuro anesthesia + rad tech + circulating RN; general anesthesia standard.
- Imaging: 3D-DSA runs for pre-procedure planning, frequent roadmap fluoroscopy, high-magnification biplane cine.
- Dose: among the highest-dose fluoroscopic procedures — careful attention to frame-rate reduction, collimation, and ClarityIQ-class dose reduction operationally meaningful.
Equipment considerations that bite
- Biplane is the table stakes — single-plane is workably for simple aneurysm coiling but limits procedure efficiency on complex anatomy. Biplane FD10 / FD15 (cardiac / neuro detector pairing) is the standard configuration.
- 3D rotational angiography (3D-DSA) is mandatory — XperCT / DynaCT / Innova CT, all licensed.
- Dose-management software — long-fluoro neuro cases hit skin-injury dose thresholds without ClarityIQ / CARE / AutoEx.
- Microcatheter / coil inventory — Stryker, MicroVention, Penumbra, Codman; per-case kit inventory must match operator preference.
- Stent-assisted / flow-diverter platforms — Pipeline (Medtronic), Surpass (Stryker), LVIS / Atlas (MicroVention) require operator credentialing.
- Tube heat capacity — long fluoro / many runs can hit thermal limits on tired tubes.
Dose considerations
Patient head dose in ruptured aneurysm cases can reach skin-injury thresholds in prolonged procedures. DAP tracked per case and reported. Operator occupational dose is significant due to long proximity to the beam — ceiling shields and lead-acrylic barriers mandatory, and operator dose-monitoring is part of the program-level discipline.
Operational reality
- Stroke / aneurysm centers concentrate volume — comprehensive stroke centers and academic neurointerventional programs handle most aneurysm coiling. Community hospitals refer.
- Hybrid OR / cath lab dual-purpose — increasingly common in larger centers.
- Refurb economics — biplane installs carry meaningful capital premium; refurb biplane FD10/FD20 is the Allura / Azurion category, biplane FD20/FD15 is the Artis category.