These catheters are designed to remove tough, mature thrombus from synthetic grafts such as PTFE.

• Collapsible for easy passage through occluded grafts.
• A flexible wire coil at the distal end easily expands when retracted to form a double-helix ring.
• Acting as a ring stripper, the ring forms a plane between graft and thrombus to effectively clear adherent material from PTFE dialysis grafts and aortobifemoral grafts.