Reducing flow through a tubular structure
In some embodiments, an apparatus, for reducing or stopping flow through a tubular structure of a patient, includes an elongate member arranged to form a frame having a distal and proximal opening and configured to be positioned within a lumen of the tubular structure. The frame includes a proximal, distal, and middle portion. The distal portion is tapered such that an outer cross sectional dimension (OCSD) of the distal opening is less than an OCSD of the middle portion. The frame is configured to be inverted such that the distal portion moves within and toward the middle portion for removing the frame from within the lumen. The apparatus also comprises a flow reducing member coupled to the frame such that when the frame is positioned within the lumen, the flow reducing member substantially reduces or totally obstructs flow of at least one of emboli and fluid flowing through the lumen.
1. An apparatus for reducing or stopping flow through a tubular structure of a patient, the apparatus comprising:
a first elongate member arranged to form a first frame having a distal opening and a proximal opening, the first frame configured to be positioned within a lumen of the tubular structure, the first frame having a proximal portion, a distal portion, and a middle portion therebetween, the distal portion tapered such that an outer cross sectional dimension of the distal opening is less than an outer cross sectional dimension of the middle portion; and
a first flow reducing member coupled to the first frame such that when the first frame is positioned within the lumen, the first flow reducing member substantially reduces or totally obstructs flow of fluid flowing through the lumen, the first flow reducing member being disposed over an exterior of the first frame and over the distal portion with at least a portion of the first flow reducing member extending from the exterior of the first frame into an interior of the first frame through the distal opening to form a single flap in the interior of the first frame, the single flap configured to operate as a one-way valve that moves in response to fluid flow to substantially prevent distal flow through the distal opening and to allow proximal flow through the distal opening.
2. The apparatus of claim 1 , wherein the first elongate member is arranged in a spiral configuration to form the first frame.
3. The apparatus of claim 1 , wherein the proximal portion is tapered such that an outer cross sectional dimension of the proximal opening is less than the outer cross sectional dimension of the middle portion.
4. The apparatus of claim 1 , wherein the first elongate member comprises a substantially rectangular cross section.
5. The apparatus of claim 1 , wherein the first flow reducing member comprises a plurality of pores each having a diameter of between about 5 microns and about 10 microns.
6. The apparatus of claim 1 , wherein a thickness of a first coil of the first frame measured along an axial dimension of the first frame is less than a thickness of a second coil of the first frame measured along the axial dimension of the first frame.
7. The apparatus of claim 1 , further comprising a retrieving member configured to couple to the distal portion and to retrieve the distal portion toward an interior of the first frame for inverting the first frame.
8. The apparatus of claim 1 , further comprising:
an outer catheter configured to be positioned within the lumen at a first deployment site; and
an inner catheter disposed within the outer catheter,
wherein the first frame is configured to be positioned between the inner catheter and the outer catheter for stowage of the first frame before the first frame is deployed within the lumen.
9. The apparatus of claim 8 , further comprising one or more threads formed in or on an outer surface of the inner catheter such that the first elongate member wraps around the one or more threads for securing the first elongate member to the inner catheter.
10. The apparatus of claim 8 , wherein the distal portion and the first flow reducing member extend distally beyond a distal opening of the outer catheter such that when the outer catheter is moved within the lumen to the first deployment site, the distally extended portion of the first flow reducing member is configured to engage a wall of the lumen to reduce friction.
11. The apparatus of claim 8 , further comprising a guide wire extending through the inner catheter and the distal opening of the first frame.
12. The apparatus of claim 11 , further comprising:
a second elongate member arranged in a spiral configuration to form a second frame having a distal opening and a proximal opening, the second frame configured to be positioned within the lumen, the second frame having a proximal portion, a distal portion, and a middle portion therebetween, the distal portion of the second frame tapered such that an outer cross sectional dimension of the distal opening of the second frame is less than an outer cross sectional dimension of the middle portion of the second frame; and
a second flow reducing member coupled to the second frame such that when the second frame is positioned within the lumen, the second flow reducing member substantially reduces or totally obstructs flow of at least one of emboli and fluid flowing through the lumen,
wherein the second frame is configured to be positioned between the outer catheter and the guide wire for stowage of the second frame before the second frame is deployed within the lumen.