Stents, valved-stents, and methods and systems for delivery thereof

• US 8,647,381 B2
• Filed: 10/27/2008
• Issued: 02/11/2014
• Est. Priority Date: 10/25/2007
• Status: Active Grant

• Current Assignee: Boston Scientific Medical Device Limited (Boston Scientific Corporation)
• Original Assignee: Symetis SA (Boston Scientific Corporation)
• Inventors: Essinger, Jacques, Hefti, Jean-Luc, Delaloye, Stephane, Delaloye, Serge
• Primary Examiner(s): GHERBI, SUZETTE JAIME J
• Application Number:
  US12/739,117
• Publication Number:
  US 20110022157A1
• Time in Patent Office: 1,933 Days
• Field of Search: 623 124- 219
• US Class Current: 623/2.17
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/2436 Deployment by retracting a sheath
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

Embodiments of the present disclosure are directed to stents, valved-stents, (e.g., single-stent-valves and double stent/valved-stent systems) and associated methods and systems for their delivery via minimally-invasive surgery. The stent component comprises a first stent section (102) a second stent section (104) a third stent section (106) and a fourth stent section (108).

Claims

1. A stent component for an aortic replacement valve for use within a human body comprising:

a first end and a second end, the first end corresponding to a proximal end of the replacement valve for positioning within or adjacent the ventricle of the heart of the human body and the second end corresponding to a distal end of the replacement valve for positioning within or adjacent the aorta of the human body; and

a plurality of sections including;

a first stent section defining an at least partly conical body, wherein the first stent section defines the proximal end of the stent component, wherein the conical body of the first stent section slopes outwardly in the direction of the first end at an angle (α

2) relative to a longitudinal axis of the replacement valve of between about 5 degrees to about 30 degrees,

a second stent section in communication with the first stent section and defining an at least partly conical body, wherein the conical body of the second stent section slopes outwardly in the direction of the second end, and

a distal stent section defining an at least partly conical body, the distal stent section defines the second end and includes a plurality of stabilization arches projecting distally to stabilize the aortic replacement valve within the aorta.

2. The stent component of claim 1, wherein the distal section comprises a third stent section and a fourth stent section, wherein:

the third stent section is in communication with the second stent section,

the third stent section comprises valve fixation arches and is configured to house at least a portion of a valve component,

the fourth stein section is in communication with the third stent section,

the fourth stent section comprises the stabilization arches and defines the second end.

3. The stent component of claim 2, wherein the third stent section includes valve fixation elements.

4. The stent component according to claim 1, wherein the outward slope of the second stent section is defined by an angle (α

1) relative to a longitudinal axis of the replacement valve of between about 10 degrees to about 80 degrees.

5. The stent component according to claim 1, wherein the end of the second stent section forms an inwardly bent tip bent toward the longitudinal axis at an angle (α

3) of between about 0 degrees to about 180 degrees.

6. The stent component according to claim 2, wherein an angle (α

4) represents an offset angle between a longitudinal axis of the stabilization arches of the forth section of the stent in the expanded configuration and the stabilization arches of the forth section of the stent component in the expanded configuration, wherein (α

4) is between about 0 degrees to about 60 degrees.

7. The stent component according to claim 1, further comprising attachment elements provided at the first end for removably attaching the stem component to a delivery device.

8. The stent component according to claim 1, wherein the first stent section is configured to create a form fit with an inflow tract of a native aortic valve for preventing migration of the replacement valve towards the ascending aorta and/or wherein the second stent section is configured to create a form fit with an outflow tract and native leaflets of a native aortic valve for preventing migration of the replacement valve towards the left ventricle.

9. The stent component according to claim 2, wherein the fourth stent section is configured to engage the ascending aorta to orient the replacement valve and an associated delivery system longitudinally within an aorta/aortic annulus and prevent tilting of the replacement valve when implanted.

10. A stent component for an aortic replacement valve for use within a human body comprising:

a first end and a second end, the first end corresponding to a proximal end of the replacement valve for positioning within or adjacent the ventricle of the heart of the human body and the second end corresponding to a distal end of the replacement valve for positioning within or adjacent the aorta of the human body; and

a plurality of sections including;

a first stent section defining an at least partly conical body, wherein the first stent section defines the proximal end of the stent component and wherein the conical body of the first stent section slopes outwardly in the direction of the first end,

a second stent section in communication with the first stent section and defining an at least partly conical body, wherein the conical body of the second stent section slopes outwardly in the direction of the second end at an angle (α

1) relative to a longitudinal axis of the replacement valve of between about 10 degrees to about 80 degree, and

a distal stent section defining an at least partly conical body, wherein the distal stent section defines the second end and includes a plurality of stabilization arches projecting distally to stabilize the aortic replacement valve within the aorta.

11. The stent component of claim 10, wherein the distal section comprises a third stein section and a fourth stent section, wherein:

the third stent section is in communication with the second stent section,

the third stent section comprises valve fixation arches and is configured to house at least a portion of a valve component,

the fourth stent section is in communication with the third stent section,

the fourth stent section comprises the stabilization arches and defines the second end.

12. The stent component of claim 10, wherein the third stent section includes valve fixation elements.

13. The stent component according to claim 10, wherein the outward slope of the second stein section is defined by an angle (α

1) relative to a longitudinal axis of the replacement valve of between about 10 degrees to about 80 degrees.

14. The stent component according to claim 10, wherein the end of the second stent section forms an inwardly bent tip bent toward the longitudinal axis at an angle (α

3) of between about 0 degrees to about 180 degrees.

15. The stent component according to claim 11, wherein an angle (α

4) represents an offset angle between a longitudinal axis of the stabilization arches of the forth section of the stent in the expanded configuration and the stabilization arches of the forth section of the stent component in the expanded configuration, wherein (α

4) is between about 0 degrees to about 60 degrees.

16. The stent component according to claim 10, further comprising attachment elements provided at the first end for removably attaching the stent component to a delivery device.

17. The stent component according to claim 10, wherein the first stent section is configured to create a form fit with an inflow tract of a native aortic valve for preventing migration of the replacement valve towards the ascending aorta and/or wherein the second stent section is configured to create a form fit with an outflow tract and native leaflets of a native aortic valve for preventing migration of the replacement valve towards the left ventricle.

18. The stent component according to claim 11, wherein the fourth stent section is configured to engage the ascending aorta to orient the replacement valve and an associated delivery system longitudinally within an aorta/aortic annulus and prevent tilting of the replacement valve when implanted.

19. A stent component for an aortic replacement valve for use within a human body comprising:

a first end and a second end, the first end corresponding to a proximal end of the replacement valve for positioning within or adjacent the ventricle of the heart of the human body and the second end corresponding to a distal end of the replacement valve for positioning within or adjacent the aorta of the human body;

and

a plurality of sections including;

a first stent section defining an at least partly conical body, wherein the first stent section defines the proximal end of the stent component, and wherein the conical body of the first stent section slopes outwardly in the direction of the first end,

a second stent section in communication with the first stent section and defining an at least partly conical body, wherein the conical body of the second stent section slopes outwardly in the direction of the second end, and

a distal stent section defining an at least partly conical body, wherein the distal stent section defines the second end and includes a plurality of stabilization arches projecting distally to stabilize the aortic replacement valve within the aorta, and wherein the end of the second stent section positioned nearest the distal stent section forms an inwardly bent tip bent toward the longitudinal axis at an angle (α

3) of between about 0 degrees to about 180 degrees.

20. The stent component of claim 19, wherein the distal section comprises a third stent section and a fourth stent section, wherein:

the third stent section is in communication with the second stem section,

the third stent section comprises valve fixation arches and is configured to house at least a portion of a valve component,

the fourth stem section is in communication with the third stent section,

the fourth stent section comprises the stabilization arches and defines the second end.

21. The stent component of claim 20, wherein the third stent section includes valve fixation elements.

22. The stent component according to claim 19, wherein the outward slope of the second stent section is defined by an angle (α

1) relative to a longitudinal axis of the replacement valve of between about 10 degrees to about 80 degrees.

23. The stent component e according to claim 19, wherein the end of the second stent section forms an inwardly bent tip bent toward the longitudinal axis at an angle (α

3) of between about 0 degrees to about 180 degrees.

24. The stent component according to claim 20, wherein an angle (α

4) represents an offset angle between a longitudinal axis of the stabilization arches of the forth section of the stent in the expanded configuration and the stabilization arches of the forth section of the stent component in the expanded configuration, wherein (α

4) is between about 0 degrees to about 60 degrees.

25. The stent component according to claim 19, further comprising attachment elements provided at the first end for removably attaching the stent component to a delivery device.

26. The stent component according to claim 19, wherein the first stent section is configured to create a form fit with an inflow tract of a native aortic valve for preventing migration of the replacement valve towards the ascending aorta and/or wherein the second stent section is configured to create a form fit with an outflow tract and native leaflets of a native aortic valve for preventing migration of the replacement valve towards the left ventricle.

27. The stent component according to claim 20, wherein the fourth stent section is configured to engage the ascending aorta to orient the replacement valve and an associated delivery system longitudinally within an aorta/aortic annulus and prevent tilting of the replacement valve when implanted.

28. A stent component for an aortic replacement valve for use within a human body comprising:

a first end and a second end, wherein the first end is the proximal end of the replacement valve for positioning within or adjacent the ventricle of the heart of the human body and the second end is the distal end for positioning within or adjacent the aorta of the human body, and

a plurality of sections including;

a first stent section defining an at least partly conical body, wherein the first stent section defines the proximal end of the stent component, the conical body of the first stent section having an axial length (H2) and an outward slope (α

2) relative to a longitudinal axis of the replacement valve,

a second stent section in communication with the first stent section and defining an at least partly conical body, wherein the conical body of the first stent section slopes outwardly in the direction of the first end, and wherein the conical body of the second stent section slopes outwardly in the direction of the second end, the conical body of the second stent section having an axial length (H1) shorter than the axial length (H2) of the conical body of the first section, and the conical body of the second stent section having an outward slope (α

1) relative to the longitudinal axis, greater in magnitude than the outward slope (α

2) of the first stent section, and

a distal stent section defining an at least partly conical body, wherein the distal stent section defines the second end and includes a plurality of stabilization arches projecting distally to stabilize the aortic replacement valve within the aorta.

29. The stent component of claim 28, wherein the distal section comprises a third stent section and a fourth stent section, wherein:

the third stent section is in communication with the second stent section,

the third stent section comprises valve fixation arches and is configured to house at least a portion of a valve component,

the fourth stent section is in communication with the third stent section,

the fourth stent section comprises the stabilization arches and defines the second end.

30. The stent component of claim 29, wherein the third stent section includes valve fixation elements.

31. The stent component according to claim 28, wherein the outward slope of the first stent section is defined by an angle (α

2) relative to a longitudinal axis of the replacement valve of between about 5 degrees to about 30 degrees.

32. The stent component according to claim 28, wherein the outward slope of the second stent section is defined by an angle (α

1) relative to a longitudinal axis of the replacement valve of between about 10 degrees to about 80 degrees.

33. The stent component according to claim 28, wherein the end of the second stent section forms an inwardly bent tip bent toward the longitudinal axis at an angle (α

3) of between about 0 degrees to about 180 degrees.

34. The stent component according to claim 29, wherein an angle (α

4) represents an offset angle between a longitudinal axis of the stabilization arches of the forth section of the stent in the expanded configuration and the stabilization arches of the forth section of the stent component in the expanded configuration, wherein (α

4) is between about 0 degrees to about 60 degrees.

35. The stent component according to claim 28, further comprising attachment elements provided at the first end for removably attaching the stent component to a delivery device.

36. The stent component according to claim 28, wherein the first stent section is configured to create a form fit with an inflow tract of a native aortic valve for preventing migration of the replacement valve towards the ascending aorta and/or wherein the second stent section is configured to create a form fit with an outflow tract and native leaflets of a native aortic valve for preventing migration of the replacement valve towards the left ventricle.

37. The stent component according to claim 29, wherein the fourth stent section is configured to engage the ascending aorta to orient the replacement valve and an associated delivery system longitudinally within an aorta/aortic annulus and prevent tilting of the replacement valve when implanted.

38. The stent component according to claim 28, wherein the axial length (H2) of the conical body of the first stent section is between about 3 mm and about 15 mm.