Percutaneous catheter directed intravascular occlusion devices
The present invention provides an improved vascular occlusion device having improved flexibility and retention of the type fabricated from braided tubular metal fabric having an expanded preset configuration and an elongated collapsed reduced diameter configuration for delivery through a catheter to a treatment site and shaped to create an occlusion of an abnormal opening in a body organ or vessel, the woven metal fabric having a memory property whereby the medical device tends to return to said expanded preset configuration when unconstrained. The device further including at least one disk portion adjacent a body cylindrical portion formed from the fabric and having a transition diameter between the disk and cylindrical portion, significantly smaller than the diameter of the disk and the diameter of the cylindrical portion.
1. A method of occluding a cavity of a patient with an occluder, the method comprising:
advancing a delivery catheter through vasculature of the patient until a distal end of the delivery catheter is positioned proximate to the cavity or within the cavity;
when the distal end of the delivery catheter is positioned proximate to the cavity or within the cavity, advancing a distal body portion of the occluder relative to the delivery catheter to allow the distal body portion to transition from a collapsed condition within the delivery catheter to an expanded condition outside of the delivery catheter;
positioning the distal body portion of the occluder within the cavity;
engaging protrusions extending from the distal body portion into frictional engagement with tissue that defines the cavity;
deploying a proximal abutment portion of the occluder from the delivery catheter such that the proximal abutment portion is, after deployment, oriented generally perpendicular to an axis of the cavity; and
positioning the proximal abutment portion against tissue of a wall forming an opening that leads into the cavity, such that the distal body portion is positioned within the cavity, the proximal abutment portion is positioned outside the cavity, and a transition member of the occluder extends through the opening and connects the distal body portion to the proximal abutment portion, the transition member having a diameter that is smaller than a diameter of the distal body portion and smaller than a diameter of the proximal abutment portion, at least a portion of the transition member being positioned radially inwardly of the distal body portion when the distal body portion is positioned within the cavity and the proximal abutment portion is positioned against tissue of the wall.
2. The method of claim 1 , wherein while the proximal abutment portion contacts the tissue of the wall that forms the opening, the transition member maintains tension between the distal body portion and the proximal abutment portion.
3. The method of claim 1 , wherein the distal body portion is cylindrical.
4. The method of claim 1 , wherein the proximal abutment portion is disk-shaped.
5. The method of claim 1 , wherein the proximal abutment portion of the occluder is deployed from the delivery catheter while the distal body portion is positioned within the cavity.
6. The method of claim 5 , wherein deploying the proximal abutment portion of the occluder from the delivery catheter includes allowing the proximal abutment portion to transition from a smaller diameter delivery configuration within the delivery catheter to a larger diameter deployed condition outside of the delivery catheter.
7. The method of claim 1 , wherein the protrusions are hooks.
8. The method of claim 7 , wherein the hooks lack barbs.
9. The method of claim 8 , wherein the lack of barbs on the hooks is configured to allow for reversible engagement of the hooks with the tissue by moving the distal body portion in a direction opposite to open ends of the hooks.
10. The method of claim 9 , wherein when deployed, the open ends of the hooks are oriented toward the proximal abutment portion.
11. The method of claim 1 , wherein when deployed, the proximal abutment portion has a diameter between 6 mm and 35 mm.
12. The method of claim 1 , wherein when deployed, the distal body portion has a diameter between 2 mm and 28 mm.
13. The method of claim 1 , wherein the transition member, when deployed, has a diameter between 1 mm and 8 mm.
14. The method of claim 1 , wherein the occluder is formed of a shape memory alloy.
15. The method of claim 14 , wherein the shape memory alloy is nitinol.
16. The method of claim 1 , wherein while positioning the distal body portion of the occluder within the cavity, a shaft within the delivery catheter is reversibly coupled to a proximal hub of the proximal abutment portion.
17. The method of claim 16 , further comprising rotating the shaft within the delivery after the distal body portion of the occluder is positioned within the cavity.
18. The method of claim 1 , wherein an occlusion material is coupled to the distal body portion.
19. The method of claim 18 , wherein the occlusion material includes polyester fiber.
20. The method of claim 1 , wherein allowing the distal body portion to transition from the collapsed condition to the expanded condition includes allowing the distal body portion to self-expand.