Mitral Valve Replacement Toggle Cell Securement

Patent metadata

Field	Value
Publication number	US-2018353291-A1
Application number	US-201816103002-A
Country	US
Kind code	A1
Filing date	Aug 14, 2018
Priority date	Mar 18, 2014
Publication date	Dec 13, 2018
Grant date	—

Abstract

A collapsible and expandable stent extends in an axial direction from a proximal end to a distal end. The stent may include a plurality of first cells, each first cell having an open space defined by a first plurality of struts. The stent may further include a second cell nested in the open space of one of the first cells, the second cell being defined by a second plurality of struts. The stent may additionally include first and second connecting struts connecting the second cell to the one first cell. The second cell may be configured to pivot about the first and second connecting struts with respect to the one first cell. The pivoting may create a clearance space between the second cell and an outer perimeter of the stent in which portions of a native valve structure may be clamped.

First claim

1 . A method of delivering a prosthetic heart valve into a patient, comprising:
loading the prosthetic heart valve into a delivery device in a collapsed condition, the delivery device including a sheath extending from a proximal end to a distal end, the prosthetic heart valve including a stent extending in an axial direction from a proximal end to a distal end and having a plurality of first cells, each first cell having an open space defined by a first plurality of struts, and a second cell nested in the open space of one of the first cells, the second cell being defined by a second plurality of struts; advancing the sheath to an implant site within the patient; retracting the sheath with respect to the prosthetic heart valve until at least a portion of the second cell is positioned outside of the sheath; and pivoting the second cell with respect to the one of the first cells to create a clearance space between the second cell and an outer perimeter of the stent.

2 . The method of claim 1 , wherein the pivoting step includes proximally pulling a pulling member operably connected to at least one of the second plurality of struts.

3 . The method of claim 1 , wherein the one of the first cells defines a surface and the second cell includes first and second struts that do not lie within the surface when no force is applied to the stent.

4 . The method of claim 3 , wherein the second cell includes third and fourth struts that lie within the surface when no force is applied to the stent.

5 . The method of claim 4 , wherein the pivoting step includes retracting the sheath with respect to the prosthetic heart valve until at least a portion of the third and fourth struts is positioned outside of the sheath and at least a portion of the first and second struts is covered by the sheath.

6 . The method of claim 4 , wherein the prosthetic heart valve includes a band encircling the stent and a pull wire operably connected to the band.

7 . The method of claim 6 , further comprising:
after the pivoting step, retracting the band relative to the stent in a proximal axial direction by pulling the pull wire proximally until the band overlies the first and second struts, but not the third and fourth struts, to pivot the second cell with respect to the first cell.

8 . The method of claim 1 , further comprising:
advancing the prosthetic heart valve distally after the clearance space has been created between the second cell and the outer perimeter of the stent until at least a portion of a native valve structure is positioned within the clearance space; and pivoting the second cell with respect to the first cell to clamp the portion of the native valve structure between the second cell and the first cell.

9 . The method of claim 3 , wherein the first and second struts of the second cell meet at a first apex that does not lie within the surface when no external force is applied to the stent.

10 . The method of claim 4 , wherein the third and fourth struts of the second cell meet at a second apex that does lie within the surface when no force is applied to the stent.

11 . The method of claim 4 , wherein the first and second struts are each positioned closer to the proximal end of the stent than are the third and fourth struts.

12 . The method of claim 1 , wherein first and second connecting struts connect the second cell to the one of the first cells.

13 . The method of claim 12 , wherein the first strut is connected to the third strut at a first connection point and the second strut is connected to the fourth strut at a second connection point, the first and second connection points being offset in the axial direction from the first and second connecting struts.

14 . The method of claim 13 , wherein the first and second struts each has a length in the axial direction which is smaller than a length in the axial direction of each of the third and fourth struts.

15 . The method of claim 12 , wherein pivoting the second cell with respect to the one of the first cells includes pivoting the second cell about the first and second connecting struts.

16 . The method of claim 2 , wherein the pulling member is connected to an aperture within the at least one of the second plurality of struts.

17 . The method of claim 6 , wherein the pull wire is threadedly connected to the band.

18 . The method of claim 1 , wherein the proximal end of the stent is an outflow end and the distal end of the stent is an inflow end.

Assignees

• St Jude Medical Cardiology Div Inc

Inventors

• Benson Thomas Mark
• Eidenschink Tracee

Classifications

• A61F2220/0008

  Fixation appliances for connecting prostheses to the body · CPC title

• A61F2/2427

  Devices for manipulating or deploying heart valves during implantation · CPC title

• A61F2/2418 Primary

  Scaffolds therefor, e.g. support stents · CPC title

• A61F2/24 Primary

  Heart valves {; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body} · CPC title