Devices and methods for occluding abnormal openings in a patient's vasculature
A medical device is provided in which one or both ends of the device encourage the formation of tissue across substantially the entire area of the respective end that is exposed to the blood flow for reducing the risk of a thrombotic embolism. The medical device includes a tubular structure having at least one expanded volume portion and a tapered transition portion. The tubular structure may be made through the braiding of a number of strands, and a first end feature may be used to secure the proximal strand ends. The proximal strand ends may be secured via the proximal end of the first end feature, such that the tapered transition portion is formed over the circumferential surface of the first end feature, and only a proximal end surface (or a portion of the proximal end surface) of the first end feature is exposed to the path of flowing blood.
1. A medical device configured to self-expand from a contracted state toward an expanded state when deployed from a delivery device, the medical device comprising:
a tubular structure comprising a plurality of braided strands, each braided strand comprising a proximal strand end and a distal strand end; and
a first end feature defining a proximal end and a distal end, wherein the proximal strand ends are received through the proximal end of the first end feature and extend toward the distal end of the first end feature.
2. The medical device of claim 1 , wherein the tubular structure further comprises:
a first expanded volume portion proximate to the first end feature; and
a first tapered transition portion extending between the first expanded volume portion and the proximal end of the first end feature.
3. The medical device of claim 2 further comprising:
a second end feature configured to receive and secure the distal strand ends.
4. The medical device of claim 3 , wherein the second end feature defines a proximal end and a distal end, wherein the second end feature is configured to receive and secure the distal strand ends via the distal end of the second end feature.
5. The medical device of claim 4 , wherein the tubular structure further comprises:
a second expanded volume portion displaced from the first expanded volume portion and proximate the second end feature; and
a second tapered transition portion extending between the second expanded volume portion and the distal end of the second end feature.
6. The medical device of claim 5 , wherein the first expanded volume portion is disk shaped, and wherein the second expanded volume portion is cylindrically shaped.
7. The medical device of claim 6 , wherein the first expanded volume portion and the second expanded volume portion are connected by a flexible connector such that the first and second expanded volume portions articulate with respect to each other.
8. The medical device of claim 1 , wherein the medical device defines a proximal end and a distal end, wherein the proximal end of the first end feature substantially coincides with the proximal end of the medical device.
9. The medical device of claim 1 , wherein the medical device is configured to occlude a vessel, cavity, hole, septal defect, or lumen in a body.
10. The medical device of claim 9 , wherein the medical device is configured to occlude the left atrial appendage of the heart and to prevent thrombus from escaping therefrom.