Fistula treatment devices and related methods

摘要

Disclosed herein are implantable fistula treatment devices and related methods. The fistula closure device comprises a distal anchor and a proximal anchor attached by a connecting member, such as a suture. Individual porous bodies are threaded directly or indirectly over the connecting member. The distal anchor comprises a plurality of foldable members threaded onto the connecting member. The foldable members are arranged in increasing surface area from distal to proximal, and each is further configured to form a mechanical interfit with adjacent foldable members to reduce sliding between members when they are tensioned together.

主权项

1. A distal anchor for an implantable fistula treatment device, the distal anchor comprising:
a suture; and a plurality of foldable members, including at least a distal-most foldable member and a proximal-most foldable member; wherein the distal-most foldable member comprises a suture attachment structure; wherein the proximal-most foldable member is configured to couple to a surface of a body lumen at a distal opening of a fistula, wherein the proximal-most foldable member is configured to occlude the fistula at the distal opening, and wherein the proximal-most foldable member is configured to slide along the suture attached to the suture attachment structure; wherein the proximal-most foldable member comprises:
a proximal first average dimension substantially parallel to a longitudinal axis of the suture,a proximal second average dimension orthogonal to the proximal first average dimension, anda proximal third average dimension orthogonal to the proximal first and second average dimensions, the proximal first average dimension being no greater than 10% of the greater of the proximal second and third average dimensions; wherein the distal-most foldable member comprises:
a distal first average dimension substantially parallel to the longitudinal axis of the suture,a distal second average dimension orthogonal to the distal first average dimension, anda distal third average dimension orthogonal to the distal first and second average dimensions, the distal first average dimension being no greater than 30% of the greater of the distal second and third average dimensions; wherein at least one of the plurality of foldable members comprises a protrusion on a first surface; and wherein at least another of the plurality of foldable members comprises a recess on a second surface that opposes the first surface, wherein the protrusion and the recess comprise complementary coupling members, such that the recess is configured to receive the protrusion to restrain relative movement of at least two of the plurality of foldable members.