Systems and methods for treating aneurysms

A treatment system comprising:

• an elongate tubular member comprising:
• a proximal portion, a distal portion, and a sidewall, wherein the sidewall defines an electrolytically corrodible detachment zone between the proximal portion and the distal portion, wherein the detachment zone defines one or more apertures formed therein and/or defines a reduced wall thickness relative to non-detachment zone portions of the sidewall;
• and
• a lumen extending therethrough;
• a medical device coupled to the tubular member distal portion;
• and
• an elongate rod slidably disposed within the tubular member lumen and slidable relative to the medical device, the elongate rod having a distally located electrode configured to be disposed adjacent to the detachment zone and a plug element disposed proximal to the electrode, the plug element having a cross-sectional dimension that is substantially the same size as an inner cross-sectional dimension of the lumen,
• wherein the elongate rod is axially moveable relative to the medical device between a first position and a second position, wherein in the first position, the plug element is disposed distal to the detachment zone such that the lumen is configured to pass a liquid embolic element therethrough, and wherein in the second position, the plug element is disposed proximal to the detachment zone such that the plug element substantially occludes the lumen to prevent the liquid embolic element from passing distally beyond the plug element.

A method comprising:

• disposing an occlusive member at a treatment site, the occlusive member coupled to a distal end of a conduit having a sidewall that defines a detachment zone that includes one or more apertures formed therein and/or a reduced wall thickness relative to non-detachment zone portions of the sidewall;
• expanding the occlusive member at the treatment site;
• disposing an elongate conductive member within a lumen of the conduit in a first position such that a distally located electrode and a plug element disposed proximal to the electrode are positioned distal to the detachment zone;
• delivering a liquid embolic element through the lumen of the conduit to the treatment site while the elongate conductive member is in the first position;
• moving the elongate conductive member proximally relative to the conduit to a second position such that the electrode is positioned adjacent to the detachment zone and the plug element is substantially occludes the lumen;
• applying a voltage across the conduit and the elongate conductive member while the elongate conductive member is in the second position, thereby electrolytically severing the conduit at the detachment zone;
• and
• proximally retracting both the conduit and the conductive member while the occlusive member remains at the treatment site.