Valvular sleeve for valvular prostheses and corresponding device

1. A valvular heart prosthesis, comprising:

a valvular sleeve including a tubular body extending between an inflow end and an outflow end, the tubular body including a sheet member folded at said outflow end, whereby the tubular body includes an inner tubular portion and an outer tubular portion surrounding the inner tubular portion;

wherein each of the inner tubular portion and the outer tubular portion includes valve leaflet portions that cooperate to form double-walled valve leaflets that extend distally of the inflow end and towards the outflow end, the double-walled valve leaflets displaceable under fluid pressure to an inward condition to impede fluid flow from the outflow end to the inflow end and an outward condition to permit fluid flow from the inflow end to the outflow end; and

a stent supporting the valvular sleeve and positioned between the inner tubular portion and the outer tubular portion directly adjacent the valve leaflet portions, the stent positioned at the fold of the sheet member at the outflow end and positioned slightly spaced from an inflow edge of the inflow end to accommodate a joining line for joining together the inner tubular portion and the outer tubular portion,

wherein the inner tubular portion and the outer tubular portion of the valvular sleeve are joined together at the inflow end to couple the valvular sleeve to the stent.

2. The valvular heart prosthesis of claim 1 , wherein said inner and outer tubular portions comprise at least one of:

respective subsequent sections of a tubular member overturned at an overturn line at said outflow end; and

respective portions of a sheet member U-folded at a folding line at said outflow end, said

U-folded sheet member having opposed end edges joined to each other to form said tubular body.

3. The valvular heart prosthesis of claim 1 , wherein said inner and outer tubular portions comprise respective wall portions of a tubular ribbon-like member.

4. The valvular heart prosthesis of claim 1 , wherein said inner and outer tubular portions are joined to each other at said valve leaflet portions.

5. The valvular heart prosthesis of claim 4 , wherein said inner and outer tubular portions are joined to each other at said valve leaflet portions by at least one of:

a scalloped joining line extending at a proximal edge of said valve leaflet portions, and

a pattern of joining lines extending distally of a proximal edge of said valve leaflet portions.

6. The valvular heart prosthesis of claim 1 , including a pad member set between said inner and outer tubular portions at said valve leaflet portions.

7. The valvular heart prosthesis of claim 1 , wherein said inner and outer tubular portions comprise respective subsequent sections of an hourglass-shaped tubular sheet member overturned at an overturn line at a waistline of the hourglass shape, said overturn line being at said outflow end of the valvular sleeve, whereby said valvular sleeve has a tapered shape from said inflow end towards said outflow end.

8. The valvular heart prosthesis of claim 1 , wherein said stent extends between said inner and outer tubular portions of the valvular sleeve.

9. The valvular heart prosthesis of claim 1 , wherein said stent is collapsible.

10. A prosthetic valvular device, comprising:

a valvular sleeve for valvular prostheses including a tubular body extending between an inflow end and an outflow end, the tubular body including a sheet member folded at said outflow end, whereby the tubular body includes an inner tubular portion and an outer tubular portion surrounding the inner tubular portion, the inner tubular portion and the outer tubular portion having a same length from the inflow end to a fold line at the outflow end;

wherein each of the inner tubular portion and the outer tubular portion includes valve leaflet portions that cooperate to form double-walled valve leaflets that extend distally of the inflow end and towards the outflow end, the double-walled valve leaflets displaceable under fluid pressure to an inward condition to impede fluid flow from the outflow end to the inflow end and an outward condition to permit fluid flow from the inflow end to the outflow end; and

a stent including prongs that support the valvular sleeve, such that each of the double-walled valve leaflets is situated between two of the prongs, wherein the valvular sleeve includes anchoring formations that anchor the valvular sleeve to the stent at the inflow end and that join together only the inner tubular portion and the outer tubular portion of the valvular sleeve at the inflow end.

11. The prosthetic valvular device of claim 10 , wherein said inner and outer tubular portions comprise at least one of:

respective subsequent sections of a tubular member overturned at the fold line at said outflow end; and

respective portions of a sheet member U-folded at the fold line at said outflow end, said U-folded sheet member having opposed end edges joined to each other to form said tubular body.

12. The prosthetic valvular device of claim 10 , wherein said inner and outer tubular portions comprise respective wall portions of a tubular ribbon-like member.

13. The prosthetic valvular device of claim 10 , wherein said inner and outer tubular portions are joined to each other at said valve leaflet portions.

14. The prosthetic valvular device of claim 13 , wherein said inner and outer tubular portions are joined to each other at said valve leaflet portions by at least one of:

a scalloped joining line extending at a proximal edge of said valve leaflet portions, and

a pattern of joining lines extending distally of a proximal edge of said valve leaflet portions.

15. The prosthetic valvular device of claim 10 , including a pad member set between said inner and outer tubular portions at said valve leaflet portions.

16. The prosthetic valvular device of claim 10 , wherein said inner and outer tubular portions comprise respective subsequent sections of an hourglass-shaped tubular sheet member overturned at the fold line at a waistline of the hourglass shape, said fold line being at said outflow end of the valvular sleeve, whereby said valvular sleeve has a tapered shape from said inflow end towards said outflow end.

17. The prosthetic valvular device of claim 10 , wherein said stent extends between said inner and outer tubular portions of the valvular sleeve.

18. The prosthetic valvular device of claim 10 , wherein said stent is collapsible.

19. A prosthetic valvular device, comprising:

a valvular sleeve for valvular prostheses including a tubular body extending between an inflow end and an outflow end, the tubular body including a sheet member folded at said outflow end, whereby the tubular body includes an inner tubular portion and an outer tubular portion surrounding the inner tubular portion;

wherein each of the inner tubular portion and the outer tubular portion includes valve leaflet portions that cooperate to form double-walled valve leaflets that extend in a distal direction of the inflow end and towards the outflow end, the double-walled valve leaflets displaceable under fluid pressure to an inward condition to impede fluid flow from the outflow end to the inflow end and an outward condition to permit fluid flow from the inflow end to the outflow end; and

a stent including prongs that support the valvular sleeve, said stent positioned to surround the valvular sleeve, wherein:

said stent includes a ring-like body at said inflow end of the valvular sleeve with a plurality of prongs extending from said ring-like body in a distal direction from said inflow end towards said outflow end of the valvular sleeve,

said prongs have a longitudinal slit,

said valvular sleeve includes folded portions which extend through the longitudinal slits of said prongs externally of said stent, and

peg members are inserted into said folded portions of the valvular sleeve externally to said stent to provide anchoring of said valvular sleeve to the stent.

20. A prosthetic valve of claim 19 , wherein a distal end of the prongs lies on an outflow circumference that has a lesser radius than a radius of an inflow end circumference from which the prongs extend.