TEMPORARY SUB-VALVULAR CHECK VALVE
A temporary subvalvular check valve has a collar and an expandable seal structure connected by pivotable struts that together support flexible leaflets. The check valve can be introduced along a tool shaft and positioned in a chamber or vasculature by expanding the seal structure against an adjacent wall. Cardiac function is augmented during valve procedures, such as valve excision, valve implantation, or valve leaflet replacement, by placing the temporary check valve just upstream of the valve being treated. The temporary check valve is collapsible so that it can be inserted through a small incision or port in the apex of the heart or through the aorta, into the ventricular cavity. Such a system thus does not require arrest or pacing of the heart and will allow such valve repair or replacement procedures to be done without concern for time or compromise to the patients' physiology.
1 . A temporary vascular check valve comprising
a central shaft;
a collar positioned about the shaft;
an annular expandable seal structure positioned about the shaft;
a plurality of struts each pivotally attached at a first end to the collar and each attached at a second end to the annular seal structure; and
a plurality of leaflets positioned between each of the plurality of struts, wherein each of the leaflets is connected along lateral edges to adjacent struts and along a bottom edge to the collar.
2 . The temporary vascular check valve of claim 1 , wherein the annular seal structure is a toroidal balloon.
3 . The temporary vascular check valve of claim 1 , wherein the annular seal structure is an expandable wire hoop.
4 . The temporary vascular check valve of claim 3 , wherein the wire hoop is formed of shape memory metal.
5 . The temporary vascular check valve of claim 1 , wherein a top edge of each of the plurality of leaflets is free and extends to a position to interface with an inner wall of the annular expandable seal structure.
6 . The temporary vascular check valve of claim 1 , wherein the central shaft is a hollow tube.
7 . The temporary vascular check valve of claim 1 further comprising a plurality of mesh segments positioned between each of the plurality of struts and outside the leaflets such that the leaflets are positioned between the mesh segments and the shaft, wherein each of the mesh segments is connected along lateral edges to adjacent struts, along a bottom edge to the collar, and along a top edge to the annular expandable seal structure.
8 . The temporary vascular check valve of claim 1 further comprising a control wire connected to the collar and extending proximally along the shaft.
9 . The temporary vascular check valve of claim 1 further comprising a fluid injection tube fluidly connected with the annular expandable seal structure and extending proximally along the shaft.
10 . A method of inserting a temporary check valve in a vascular structure comprising inserting a tubular shaft within a vascular structure;
advancing the temporary check valve along the tubular shaft to a desired position within the vasculature, wherein the temporary check valve further comprises
a collar positioned about the tubular shaft;
an annular expandable seal structure positioned about the shaft;
a plurality of struts each pivotally attached at a first end to the collar and each attached at a second end to the annular seal structure; and
a plurality of leaflets positioned between each of the plurality of struts, wherein each of the leaflets is connected along lateral edges to adjacent struts and along a bottom edge to the collar; and
expanding the expandable seal structure to seal against sidewalls of the vascular structure.
11 . The method of claim 10 further comprising orienting the temporary check valve such that the collar is anterior to the annular expandable seal structure with respect to a direction of vascular fluid flow.
12 . The method of claim 10 , wherein the operation of inserting further comprises collapsing the expandable seal structure, the leaflets, and the struts to a position against and substantially parallel to the tubular shaft.
13 . The method of claim 10 , wherein the operation of expanding further comprises manually expanding the struts from a collapsed position against the tubular shaft to seal the expandable seal structure against the sidewalls of the vascular structure.
14 . The method of claim 10 , wherein the vascular structure is a heart and the operation of inserting further comprises
incising an apex of the heart to access a ventricular chamber; and
inserting the tubular shaft into the ventricular chamber.
15 . The method of claim 13 , wherein
the operation of advancing further comprises
advancing the tubular shaft through the ventricular chamber, past the aortic valve, and into the aorta; and
positioning the temporary check valve within the ventricular chamber proximal to the aortic valve; and
the operation of expanding further comprises expanding the expandable seal structure to seal against sidewalls of the ventricular chamber proximal to the aortic valve.
16 . The method of claim 15 , wherein the operation of advancing further comprises positioning the expandable seal structure against an underside of an existing in vivo, in situ bioprosthetic valve.
17 . The method of claim 10 , wherein
the operation of advancing the temporary check valve further comprises
advancing the tubular shaft through the aorta, past the aortic valve, and into the ventricular chamber; and
positioning the temporary check valve within the ventricular chamber proximal to the aortic valve; and
the operation of expanding further comprises expanding the expandable seal structure to seal against sidewalls of the ventricular chamber proximal to the aortic valve.
18 . The method of claim 17 , wherein the operation of advancing further comprises positioning the expandable seal structure against an underside of an existing in vivo, in situ bioprosthetic valve.
19 . The method of claim 10 further comprising moving the tubular shaft through the collar while retaining the collar in a fixed position in vivo.