Electrically enhanced retrieval of material from vessel lumens

A medical device comprising:

• a manipulation assembly having a distal portion configured to be intravascularly positioned within a blood vessel lumen, the manipulation assembly comprising:
• a hypotube configured to be coupled to a first electrical terminal, the hypotube having a proximal portion, a distal portion, and a lumen extending therein;
• a joining element located at the distal portion of the hypotube, the joining element comprising a first end surface, a second end surface opposite the first end surface along a length of the joining element, an annular sidewall therebetween, and a lumen extending from the first end surface to the second end surface of the joining element, wherein the lumen of the joining element has a lumen greatest cross-sectional dimension and a lumen smallest cross-sectional dimension;
• an elongate member configure to be coupled to a second electrical terminal, the elongate member extending through the lumen of the joining element:
• an insulating layer dispos between at le st a portion of the hypotube and at least a portion of the elongate member, and
• an interventional element comprising an attachment portion comprising a projection including a flange extending laterally away from a longitudinal axis of the device,
• wherein the flange has a flange greatest cross-sectional dimension and a flange smallest cross-sectional dimension, the flange greatest cross-sectional dimension being greater than the lumen smallest cross-sectional dimension and less than the lumen greatest cross-sectional dimension, and the flange smallest cross-sectional dimension being less than the lumen smallest cross- sectional dimension,
• wherein the projection is positioned within the lumen of the joining element such that the flange engages the joining element and limits longitudinal movement of the interventional element with respect to the joining element, and
• wherein the elongate member is positioned adjacent to the projection such that the elongate member is configured to limit radial translation of the projection within the lumen of the joining element.

A medical device comprising:

• a manipulation assembly having a distal portion configured to be intravascularly positioned within a blood vessel lumen, the manipulation assembly comprising:
• a tubular member configured to be coupled to a first electrical terminal, the tubular member having a proximal portion, a distal portion, and a lumen extending therein, wherein the distal portion of the tubular member comprises an aperture;
• an elongate member configured to be coupled to a second electrical terminal, the elongate member extending through the lumen of the tubular member;
• and
• an insulating layer disposed between at least a portion of the tubular member and at least a portion of the elongate member;
• and
• an interventional element having a proximally located attachment portion, wherein the attachment portion includes a proximal engagement portion that is slidably received within the aperture of the distal portion of the tubular member such that the attachment portion engages the tubular member, and wherein the proximal engagement portion is entirely disposed within the lumen of the tubular member, wherein the elongate member is positioned adjacent to the attachment portion such that the elongate member is configured to limit radial translation of the attachment portion within the lumen of the tubular member.