Blood flow reducer for cardiovascular treatment
A blood flow reducing assembly includes a catheter shaft and an expandable occlusion member assembled with the catheter shaft. The expandable occlusion member includes foldable protrusions. One or more manipulation members are connected to the foldable protrusions and operative to move the foldable protrusions closer to or further away from one other. Movement of the foldable protrusions modifies occlusion ability of the foldable protrusions.
1. An adjustable blood flow method for adjustably reducing blood flow within a blood vessel comprising:
positioning an expandable element of an adjustable blood flow assembly within a blood vessel having a blood vessel diameter (BVD), the expandable element including:
a cylindrical wire structure comprising a plurality of wire elements;
a proximal end and a distal end;
a cylindrical section having a first diameter, the first diameter corresponding at least approximately to the BVD;
an adjustable, radially inwardly foldable outer circumference (IFOC) comprising a plurality of foldable protrusions forming the distal end; and
a blood impervious cover configured to cover a surface of at least the IFOC such that the surface of the IFOC is integral;
and
adjusting the IFOC via a handle located outside of the blood vessel such that the IFOC forms a blood flow orifice at the distal end having a second diameter smaller than the first diameter so as to produce a desired reduced blood flow from the orifice,
wherein:
the IFOC is operably connected to one or more connecting links extending from the expandable element to the handle via a shaft,
each foldable protrusion comprises a wire element extending from the cylindrical wire structure forming a loop;
and
the second diameter is established via pulling of the one or more connecting links in a direction toward the handle such that the IFOC folds inward.
2. The method of claim 1 , wherein the expandable element includes:
the proximal end is configured for placement in an upstream direction of a blood flow in the blood vessel;
and
the distal end is configured for placement in a downstream direction of the blood flow in the blood vessel.
3. The method of claim 2 , wherein the IFOC is arranged on or near the distal end.
4. The method of claim 1 , wherein the expandable element includes a plurality of interconnecting struts.
5. The method of claim 4 , wherein a set of the struts forms the IFOC.
6. The method of claim 5 , wherein the set of struts forming the IFOC is operably connected to the one or more connecting links.
7. The method of claim 6 , wherein movement of the connecting links via the handle cause the set of struts of the IFOC to fold the IFOC inwardly so as to reduce the second diameter.
8. The method of claim 1 , wherein:
the IFOC includes a plurality of foldable protrusions pivotable inwardly relative to the longitudinal axis; and
the assembly further includes the catheter shaft, wherein the expandable element is integral with or otherwise attached to a distal end of the shaft.
9. The method of claim 1 , wherein the assembly further comprises the handle.