Claims
- 1. An embolic filtering system for use in a body lumen, comprising:
a self-expanding strut assembly including a nickel-titanium alloy, wherein the alloy includes a ternary element selected from the group of elements consisting of platinum, palladium, or tantalum, and wherein the alloy further includes a hysteresis curve with a loading plateau at about 100 ksi to 110 ksi and an unloading plateau at about 55 ksi to 100 ksi; and a filter element disposed on the strut assembly.
- 2. The embolic filtering system of claim 1, wherein the system includes an elastic sheath at least partially overlying the filter element.
- 3. The embolic filtering system of claim 2, wherein the self-expanding strut assembly is cut from a tube with truncated diamond shape openings.
- 4. The embolic filtering system of claim 1, wherein the self-expanding strut assembly when deployed has a generally conical shape with a first base, and the filter element when deployed has a generally conical shape with a second base, and wherein the first and second bases are joined.
- 5. The embolic filtering system of claim 1, wherein the self-expanding strut assembly includes a strut pattern that is laser cut from a tube.
- 6. The embolic filtering system of claim 1, wherein the alloy includes a transition temperature set below human body temperature.
- 7. The embolic filtering system of claim 1, wherein the hysteresis curve includes about a 2:1 ratio of loading stress to unloading stress.
- 8. The embolic filtering system of claim 1, wherein the nickel-titanium alloy exhibits superelasticity while inside the body lumen.
- 9. A filtering system for use in a body lumen, comprising:
a self-expanding strut assembly including a nickel-titanium alloy, wherein the nickel-titanium alloy includes a ternary element selected from the group of elements consisting of platinum, palladium, or tantalum conferring a substantially small stress hysteresis with a ratio of loading plateau stress to unloading plateau stress is about 2:1 to 1.1:1 and a loading plateau of about 110 ksi; and a filter element disposed on the self-expanding strut assembly.
- 10. The filtering system of claim 9, wherein the unloading plateau is about 55 ksi.
- 11. The filtering system of claim 9, wherein self-expanding strut assembly has been heat treated at about 500 degrees C.
- 12. A filtering system for use in a body lumen, comprising:
a self-expanding strut assembly including a superelastic alloy, wherein the superelastic alloy includes about 30 to 52 atomic percent titanium, at least about 38 atomic percent nickel, and about up to 15 atomic percent of a ternary element selected from the group of elements consisting of platinum, palladium, or tantalum, and wherein a stress hysteresis curve of the alloy includes a loading plateau of about 110 ksi and an unloading plateau of about 55 ksi; and a filter element disposed on the self-expanding strut assembly.
- 13. The filtering system of claim 12, wherein the hysteresis curve of the alloy includes an absolute Δy of about 55 ksi.
- 14. The filtering system of claim 12, wherein the hysteresis curve of the alloy includes a ratio of loading to unloading plateaus stresses of about 2:1.
- 15. The filtering system of claim 12, wherein the self-expanding strut assembly expands inside the body lumen through shape memory effect.
- 16. The filtering system of claim 12, wherein the superelastic alloy includes a transition temperature below 45 degrees C.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of co-pending parent application having Ser. No. 09/561,747 filed on Apr. 28, 2000, whose entire contents are hereby incorporated by reference.
Continuations (1)
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Number |
Date |
Country |
Parent |
09561747 |
Apr 2000 |
US |
Child |
10764841 |
Jan 2004 |
US |