Medical device with stiffener wire for occluding vascular defects

A medical device for treating a target site comprising:

• a tubular structure having a preset, initial, expanded configuration and comprising proximal and distal ends and at least one layer of braided material configured to facilitate thrombosis, the tubular structure comprising an end section at each of the proximal and distal ends having a cross-sectional dimension larger than that of an opening of the target site, the tubular structure further comprising a central portion extending between the end sections, wherein the central portion comprises a first portion extending from the first end section, a second portion extending from the second end section, and a third portion extending from the first portion to the second portion, wherein the first and second portions extend substantially perpendicularly with respect to each of the first and second end sections in the preset, expanded configuration, and the third portion extends linearly and substantially parallel to the first and second end sections in the preset, initial, expanded configuration;
• and
• a single stiffener wire having a preset, initial, expanded configuration and comprising proximal and distal ends, the proximal end of the stiffener wire affixed to the proximal end of the tubular structure and the distal end of the stiffener wire affixed to the distal end of the tubular structure, the stiffener wire positioned within each of the end sections and the central portion and comprising one or more loops within the tubular structure in the preset, initial, expanded configuration, wherein the one or more loops are disposed within each end section and have a cross-sectional dimension larger than that of the opening of the target site, and wherein the stiffener wire is configured to extend at least partially through the opening and configured to apply a clamping force on the end sections so as to facilitate drawing the end sections toward each other in the preset, initial, expanded configuration,
• wherein the end sections of the tubular structure are disposed non-coaxially with respect to one another in the respective preset, initial, expanded configurations, wherein the tubular structure and stiffener wire are configured to be constrained from the respective preset, initial, expanded configurations to respective reduced configurations for delivery to the target site and to at least partially return to the respective preset, initial, expanded configurations at the target site when unconstrained.

A medical device for treating a target site comprising:

• a tubular structure having a preset, initial, expanded configuration and comprising proximal and distal ends and at least one layer of braided material configured to facilitate thrombosis, the tubular structure comprising an end section at the proximal end and an end section at the distal end, each having a cross-sectional dimension larger than that of an opening of the target site, the tubular structure further comprising a central portion extending between the end section at the proximal end and the end section at the distal end, wherein the end section at the proximal end and the end section at the distal end are disposed non-coaxially with respect to one another in the preset, initial, expanded configuration, and wherein the central portion comprises a first portion extending from the first end section, a second portion extending from the second end section, and a third portion extending from the first portion to the second portion, wherein the first and second portions extend substantially perpendicularly with respect to each of the first and second end sections in the preset, expanded configuration and the third portion extends linearly and substantially parallel to the first and second end sections in the preset initial expanded configuration;
• and
• a single stiffener wire having a preset, initial, expanded configuration and comprising proximal and distal ends, the proximal or distal end of the stiffener wire affixed to the proximal or distal end of the tubular structure, the stiffener wire comprising one or more loops in the preset, initial, expanded configuration formed of a stiffer material than the at least one layer of braided material, the one or more loops having a cross-sectional dimension larger than that of the opening of the target site, the stiffener wire configured to extend at least partially through the opening and configured to apply a clamping force on the end sections so as to facilitate drawing the end sections toward each other and securing the end sections over the opening in the preset, initial, expanded configuration,
• wherein the tubular structure and the stiffener wire are configured to be constrained from the respective preset, initial, expanded configurations to respective reduced configurations for delivery to the target site and to at least partially return to the respective preset, initial, expanded configurations at the target site when unconstrained.