Methods for creating woven devices
View Patent ↗Self expandable, woven intravascular devices for use as stents (both straight and tapered), filters (both temporary and permanent) and occluders for insertion and implantation into a variety of anatomical structures. The devices may be formed from shape memory metals such as nitinol. The devices may also be formed from biodegradable materials. Delivery systems for the devices include two hollow tubes that operate coaxially. A device is secured to the tubes prior to the implantation and delivery of the device by securing one end of the device to the outside of the inner tube and by securing the other end of the device to the outside of the outer tube. The stents may be partially or completely covered by graft materials, but may also be bare. The devices may be formed from a single wire. The devices may be formed by either hand or machine weaving. The devices may be created by bending shape memory wires around tabs projecting from a template, and weaving the ends of the wires to create the body of the device such that the wires cross each other to form a plurality of angles, at least one of the angles being obtuse. The value of the obtuse angle may be increased by axially compressing the body.
1. A method of creating a body suitable for implantation into an anatomical structure, the body having two ends, the method comprising:
bending the shape memory wires in a plurality of shape memory wires to create bent portions in the shape memory wires, the bent portions being arranged to define one end of the body, each shape memory wire having two ends; and
weaving the ends of the shape memory wires to create the body such that the shape memory wires cross each other to form a plurality of angles, at least one of the angles being obtuse;
wherein the value of the at least one obtuse angle may be increased by axially compressing the body.
2. The method of claim 1 , wherein the bent portions are bends.
3. The method of claim 1 , wherein the bent portions are loops.
4. The method of claim 1 , wherein the shape memory wires comprise nitinol.
5. The method of claim 1 , wherein the shape memory wires comprise FePt, FePd or FeNiCoTi.
6. The method of claim 1 , wherein the shape memory wires comprise FeNiC, FeMnSi or FeMnSiCrNi.
7. The method of claim 1 , wherein the shape memory each have a diameter ranging in size from about 0.006 inches to about 0.012 inches.
8. The method of claim 1 , wherein the plurality of shape memory wires includes at least 6 shape memory wires.
9. The method of claim 1 , wherein the body has a tubular shape with a substantially uniform diameter.
10. The method of claim 1 , wherein the body has a tapered shape with a diameter that decreases from one end of the body to the other end of the body.
11. The method of claim 1 , wherein the body has a generally hourglass shape.
12. The method of claim 1 , wherein the weaving is by hand.
13. The method of claim 1 , wherein the weaving is by machine.