Braided vascular devices having no end clamps
In some embodiments, a medical device may include one or more of the following features: (a) a metal fabric formed of braided metal strands, (b) the medical device having a collapsed configuration for delivery through a channel in a patient's body and having a generally dumbbell-shaped expanded configuration with two expanded diameter portions, separated by a reduced diameter portion formed between opposed ends of the device and unsecured metal strand ends at the opposed ends, and (d) a thrombogenic agent located on the metal fabric.
1. A medical device, comprising:
a plurality of metal strands woven into a tubular metal fabric having a longitudinal axis, a proximal end, a distal end, and a segment therebetween, the tubular metal fabric having wire ends at each of the proximal and distal ends and an expanded preset configuration, the expanded preset configuration being deformable to a lesser cross-sectional dimension for delivery through a channel in a patient's body, the tubular metal fabric having a memory property whereby the tubular metal fabric returns to the expanded preset configuration, the wire ends being unsecured and free at each of the proximal and distal ends such that the wire ends are exposed, wherein the free wire ends at each of the proximal and distal ends extend radially inward with respect to the longitudinal axis to an opening having an inner diameter smaller than an outer diameter of at least a portion of the segment, and further wherein the free wire ends of at least one of the proximal and distal ends of the tubular metal fabric define an end wall arranged within a plane perpendicular to the longitudinal axis such that the free wire ends of the at least one of the proximal and distal ends are positioned in the plane of the end wall.
2. The medical device of claim 1 , wherein the tubular metal fabric is selected from the group consisting of an occluder, a shunt, and a flow restrictor.
3. The medical device of claim 1 , further comprising:
an occluding fiber retained within an expandable hollow central portion formed by the tubular metal fabric.
4. The medical device of claim 1 , wherein the tubular metal fabric is manufactured from an alloy selected from the group consisting of stainless steel, nickel-titanium, and cobalt-chromium-nickel.
5. The medical device of claim 1 , wherein at least a portion of the segment of the tubular metal fabric is in the shape of a disc in the expanded preset configuration.
6. The medical device of claim 1 , wherein the tubular metal fabric is in the shape of a dumbbell in the expanded preset configuration with two expanded diameter portions separated by a reduced diameter portion formed between the proximal and distal ends.
7. The medical device of claim 6 , wherein the free wire ends are heat-treated to prevent unraveling.
8. The medical device of claim 6 , wherein the tubular metal fabric is adapted for delivery to a treatment site in a patient with a clamping force against an inner lumen of a delivery device.
9. The medical device of claim 6 , wherein the free wire ends are co-planar with a respective plane defined by the expanded diameter portions of each of the proximal and distal ends.
10. The medical device of claim 6 , further comprising:
a thrombogenic agent located on the tubular metal fabric.
11. The medical device of claim 1 , wherein at least a portion of the segment of the tubular metal fabric comprises two discs, wherein one of the two discs is adjacent the proximal or distal end in the expanded preset configuration.
12. The medical device of claim 11 , wherein each of the two discs is adjacent the proximal and distal ends of the tubular metal fabric, respectively.
13. The medical device of claim 1 , wherein the segment comprises a flow passage therethrough.
14. The medical device of claim 1 , further comprising:
a polyester fabric attached to the tubular metal fabric.
15. The medical device of claim 1 , wherein the tubular metal fabric is adapted for delivery to a treatment site in a patient with a clamping force against an inner lumen of a delivery device.
16. The medical device of claim 1 , wherein the tubular metal fabric is formed from a shape memory alloy.
17. The medical device of claim 16 , wherein the shape memory alloy is Nitinol.
18. A medical device, comprising:
a tubular braided metal fabric having a proximal end, a distal end, and a longitudinal axis extending therebetween, the tubular braided metal fabric comprising:
a plurality of metal strands woven to define the tubular braided metal fabric and having wire ends at each of the proximal and distal ends, the plurality of metal strands formed of a memory material and shaped such that the tubular braided metal fabric has an expanded preset configuration;
an expanded diameter portion at the proximal or distal end in the expanded preset configuration; and
a reduced diameter portion disposed between the proximal and distal ends and having a smaller outer diameter than the expanded diameter portion in the expanded preset configuration,
wherein the wire ends are unsecured and free at each of the proximal and distal ends such that the wire ends are exposed,
wherein the free wire ends at each of the proximal and distal ends extend radially inward with respect to the longitudinal axis and along respective planes to define an end wall at each of the proximal and distal ends,
and wherein the end wall defined by at least one of the proximal and distal ends of the tubular metal fabric is arranged within a plane perpendicular to the longitudinal axis.