Body lumen closure
Method and apparatus implementing and using techniques for body lumen closure, including use of an implantable medical closure device. The device includes a flexible strand defining an arcuate form. The strand is deformable upon implantation from a large cross-section condition to a small cross-section condition and has at least two anchoring portions disposed along the strand. The anchoring portions are configured to penetrate a wall of a body lumen such that when the strand is deformed to the small cross-section condition, the wall of the body lumen is disposed inwardly.
1. A method of treating a vessel of a vasculature, comprising:
delivering a closure device into a lumen of the vessel of the vasculature, the closure device comprising a strand having a helical shape;
positioning the strand while in a first cross-sectional condition about a body lumen of the vessel of the vasculature such that a portion of the strand penetrates the wall of the body lumen; and
deforming the strand to a second cross-sectional condition smaller than the first cross-section condition such that the wall of the body lumen of the vessel of the vasculature is moved inwardly.
2. The method of claim 1 , wherein the strand is positioned about the body lumen such that an end of the strand extends through the wall of the body lumen.
3. The method of claim 2 , further comprising:
disposing the strand on a catheter; and
delivering the catheter into the body lumen.
4. The method of claim 3 , further comprising:
providing the strand on a catheter including an expansion member.
5. The method of claim 1 , further comprising:
positioning the strand about a valve structure of the vessel of the vasculature.
6. The method of claim 4 , further comprising:
positioning the strand about the expansion member, where the expansion member operates between a small cross-section and a large cross-section.
7. The method of claim 6 , where positioning the strand about the expansion member comprises positioning the strand about an inflatable balloon.
8. The method of claim 6 , where positioning the strand about the expansion member comprises positioning the strand about a mechanical expander.
9. The method of claim 6 , where positioning the strand about the expansion member comprises positioning the strand about a leveraging device.
10. The method of claim 1 , where deforming the strand to the smaller cross-section includes deforming the strand from a first cross-section condition to a larger cross-section condition; and
deforming the strand from the larger cross-section condition to the smaller cross-section condition upon implantation in the body lumen adjacent a venous valve.
11. The method of claim 1 , where positioning the strand about the body includes penetrating the wall of the body lumen with at least two anchoring portions disposed along the strand.
12. The method of claim 1 , where positioning the strand about the body lumen includes penetrating anchoring portion of the strand through the wall of the body lumen in a large cross-section condition.
13. The method of claim 1 , where delivering the closure device into the lumen includes delivering an arched closure device into the lumen.
14. The method of claim 1 , where delivering the closure device into the lumen includes delivering a helical closure device into the lumen.
15. The method of claim 1 , where deforming the strand includes changing the strand from a large cross-section to the smaller cross-section condition by elastic recovery forces.
16. The method of claim 1 , where deforming the strand includes changing the strand from a large cross-section to the smaller cross-section condition by thermal shape-memory effect.