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1. WO2020117865 - SYSTEMS AND METHODS FOR TREATING CHRONIC TOTAL OCCLUSION OF AN ARTERY

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[ EN ]

CLAIMS

Claimed are:

1. A system comprising:

a small-diameter tube having an elongated body, a distal tip, and an inner lumen that extends the length of the tube, the distal tip including a magnetic element that generates a strong focal magnetic field; and

a crossing wire having an elongated body and a distal tip, the distal tip of the crossing wire including a ferromagnetic element that is magnetically attracted to the distal tip of the small-diameter tube when the distal tip of the crossing wire is placed in proximity to the distal tip of the small-diameter tube so as to facilitate alignment of the distal tips.

2. The system of claim 1 , wherein the small-diameter tube has an outer diameter no greater than 7 mm.

3. The system of claim 1 , wherein the inner lumen of the small-diameter tube has a diameter no greater than 1 mm.

4. The system of claim 1 , wherein the small-diameter tube is a microcatheter.

5. The system of claim 4, wherein the microcatheter comprises an inner strengthening member and a polymeric outer layer.

6. The system of claim 1 , wherein the small-diameter tube is a dilator.

7. The system of claim 6, wherein the dilator is configured as a solid polymeric tube having an inner lumen and a tapered distal tip.

8. The system of claim 1 , wherein the magnetic element comprises a single-crystal magnet.

9. The system of claim 8, wherein the single-crystal magnet is made of a rare-earth metal.

10. The system of claim 1 , wherein the inner lumen of the small-diameter tube is configured to receive the crossing wire.

11. The system of claim 10, wherein the small-diameter tube is configured to automatically draw the distal tip of the crossing wire into the inner lumen when the distal tip of the crossing wire is placed in close proximity to the distal tip of the small-diameter tube.

12. The system of claim 1 , wherein a stiffness of the crossing wire gradually increases near its distal tip.

13. A small-diameter tube comprising:

an elongated body;

a distal tip;

an inner lumen that extends the length of the tube; and

a magnetic element associated with the distal tip that generates a strong focal magnetic field that attracts ferromagnetic materials.

14. The small-diameter tube of claim 13 wherein the small-diameter tube has an outer diameter no greater than 7 mm.

15. The small-diameter tube of claim 13, wherein the inner lumen of the small-diameter tube has a diameter no greater than 1 mm.

16. The small-diameter tube of claim 13, wherein the small-diameter tube is a microcatheter having an inner strengthening member and a polymeric outer layer.

17. The small-diameter tube of claim 13, wherein the small-diameter tube is a dilator configured as a solid polymeric tube having an inner lumen and a tapered distal tip.

18. The small-diameter tube of claim 13, wherein the magnetic element comprises a single-crystal magnet.

19. The small-diameter tube of claim 18, wherein the single-crystal magnet is made of a rare-earth metal.

20. A method for treating total occlusion of an artery of a patient, the method comprising:

positioning a small-diameter tube on a first side of an arterial plaque causing the total occlusion, the small-diameter tube having an elongated body, a distal tip, and an inner lumen that extends the length of the tube, the distal tip including a magnetic element that generates a strong focal magnetic field;

positioning a crossing wire on a second side of the arterial plaque, the crossing wire having an elongated body and a distal tip, the distal tip of the crossing wire including a ferromagnetic element;

advancing the crossing wire through or around the arterial plaque toward the small-diameter tube so as to position the distal tip of the crossing wire proximate to the distal tip of the small-diameter tube, wherein the distal tip of the crossing wire is drawn to the distal tip of the small-diameter tube due to magnetic attraction; and

continuing to advance the crossing wire toward the small-diameter tube until the crossing wire is drawn into the inner lumen of the small-diameter tube under the effects of the magnetic attraction.

21. The method of claim 20, further comprising advancing the crossing wire thorough the inner lumen of the small-diameter tube until the distal tip of the crossing wire is positioned outside of the patient’s body.

22. The method of claim 21 , further comprising removing the small-diameter tube from the patient.

23. The method of claim 22, further comprising advancing a stent over the crossing wire and positioning the stent within the artery at the location of the plaque.

24. The method of claim 23, further comprising deploying the stent at the location of the plaque to restore patency to the artery.