1 · Access
Create controlled entry into the vessel, duct, collecting system, organ, or collection.
2 · Preserve access
Secure a guidewire or catheter position so the initial route is not lost.
3 · Establish a platform
Use a sheath, dilator, guide catheter, or supportive wire to create a stable working channel.
4 · Reach and position
Select, navigate, or cross toward the target using progressively more specialized devices.
5 · Perform the primary task
Drain, sample, dilate, embolize, retrieve, ablate, stent, or otherwise treat the target.
6 · Finish
Remove or leave the intended device, achieve hemostasis, and secure external components.