Interventional catheter system and methods

An interventional catheter system for treating a blood vessel, comprising:

• an access sheath positionable transcervically in a carotid artery, the access sheath comprising a distal section attachable to a reverse flow path, a proximal extension outside of the reverse flow path and connected to the distal section by a connector;
• an elongate stent delivery catheter sized for insertion through the access sheath when the access sheath is positioned in the carotid artery;
• a stent positioned on a distal region of the stent delivery catheter;
• a retractable stent containment member slidably positioned over the stent delivery catheter and the stent such that the stent containment member contains the stent in a collapsed state, wherein the retractable stent containment member is configured to be retracted from the stent delivery catheter by a length to expose the stent;
• a control mechanism on a proximal region of the stent delivery catheter, the control mechanism being coupled to the stent containment member such that the control mechanism can be actuated to retract the stent containment member;
• and
• wherein retraction of the stent containment member from the stent delivery catheter withdraws the stent containment member into the proximal extension at least partially proximal to the connector.