Retrieval of material from vessel lumens

A device for retrieving clot material from a blood vessel lumen, the device comprising:

• an interventional element having an elongated proximal region and an opening extending laterally through the proximal region;
• a manipulation member having a distal zone and a coupling element at the distal zone, wherein at least a portion of the coupling element extends through the opening at the proximal region of the interventional element;
• a cover having a first end portion coupled to the distal zone of the manipulation member and a free second end portion, wherein the cover has a first position in which the second end portion extends proximally from the first end portion, and a second position in which the second end portion extends distally from the first end portion such that the cover at least partially surrounds the interventional element and is inverted relative to the first position;
• an inner band at least partially surrounding the distal zone of the manipulation member and a portion of the proximal region of the interventional element;
• an outer band at least partially surrounding the inner band, wherein the first end portion of the cover is secured between the inner band and the outer band such that an outermost end of the inner band is radially inward of an innermost end of the first end portion of the cover;
• and
• a jacket material over a proximal terminus of the inner band and at least a portion of the manipulation member proximal of the proximal terminus of the inner band,
• wherein at least one of the inner band or the outer band is fixed relative to the manipulation member.

A method for retrieving clot material from a treatment site within a blood vessel lumen, the method comprising:

• providing a clot retrieving device including an elongated shaft having a distal zone and a retrieval assembly at the distal zone, the retrieval assembly having:
• a capture structure with a proximal region coupled to the distal zone of the elongated shaft,
• a cover having a first end portion coupled to the distal zone of the elongated shaft and a free second end portion, the cover having a first position in which the second end portion extends proximally from the first end portion, and a second position in which the second end portion extends distally from the first end portion such that the cover at least partially surrounds the capture structure and is inverted relative to the first position;
• a connector coupled to the distal zone of elongated shaft, the connector including an inner band and an outer band, wherein (a) the inner band at least partially surrounds the distal zone of the elongated shaft and the proximal region of the capture structure, (b) the outer band at least partially surrounds the inner band, and (c) the first end portion of the cover is secured between the inner band and the outer band such that an outermost end of the inner band is radially inward of an innermost end of the first end portion of the cover, wherein the connector is fixed relative to the elongated shaft;
• and
• a jacket material over a proximal terminus of the inner band and at least a portion of the elongated shaft proximal of the proximal of the proximal terminus of the inner band;
• intravascularly advancing the clot retrieving device within a delivery catheter to the treatment site such that the retrieval assembly is positioned proximate the clot material at the treatment site;
• deploying the retrieval assembly within the blood vessel lumen such that the retrieval assembly expands to the first position;
• and
• withdrawing the retrieval assembly proximally through the delivery catheter to remove clot material from the treatment site.