Suction stent
The present invention relates to a stent for introduction into a hollow organ, in particular the gastrointestinal tract, of a human or animal patient, which brings about vacuum sealing of leaks, such as anastomosis insufficiencies, in the hollow organ.
1. A stent for introduction into a hollow organ of the human or animal body comprising: a radially expandable tubular hollow body ( 1 ) having a lumen and a diameter that increases at one or both end region(s) of the hollow body, a porous shapeable material ( 3 ) radially sheathing the hollow body ( 1 ) at least in certain regions, wherein the thickness (T) of the material ( 3 ) decreases at the end region(s) of the hollow body as the diameter of the hollow body ( 1 ) increases in the end region(s), and a drainage means ( 4 ), wherein the drainage means is introduced into the porous shapeable material ( 3 ) and configured to apply suction or a sub-normal pressure or a vacuum, wherein the lumen of the hollow body ( 1 ) is air- and water-tight with respect to the material ( 3 ).
2. A stent according to claim 1 , wherein the material ( 3 ) substantially completely radially sheaths the hollow body ( 1 ).
3. A stent according to claim 1 , wherein the porous shapeable material ( 3 ) is tubular and has substantially the same longitudinal extent as the hollow body ( 1 ).
4. A stent according to claim 1 , wherein the material ( 3 ) is air- and water-tight, at least in certain regions.
5. A stent according to claim 1 , wherein the material ( 3 ) comprises a closed-pore material, in the form of a foam, which is air- and water-tight.
6. A stent according to claim 1 , wherein the drainage means ( 4 ) is introduced into the material ( 3 ) via a point of passage (P) in an air- and water-tight layer.
7. A stent according to claim 6 , wherein, at the point of passage (P), the hollow body ( 1 ) is sealed from the drainage means ( 4 ) by an easily deformable, non-flowing sealant (S).
8. A stent according to claim 7 , wherein the sealant (S) comprises a material selected from the group consisting of a silicone, hydrocolloid or lyogel, such as a hydrogel.
9. A stent according to claim 1 , wherein the material ( 3 ) is a plastics material foam.
10. A stent according to claim 9 , wherein the plastics material foam is selected from the group consisting of polyurethanes and polyvinyl alcohols.
11. A stent according to claim 1 , wherein the hollow body ( 1 ) is sealed from the material ( 3 ) by an air- and water-tight layer ( 2 ).
12. A stent according to claim 11 , wherein the layer ( 2 ) is tubular.
13. A stent according to claim 11 , wherein the layer ( 2 ) contains a plastics material or consists thereof.
14. A stent according to claim 13 , wherein the plastics material is selected from the group consisting of polyurethanes, latex and silicone.
15. A stent for introduction into a hollow organ of the human or animal body comprising: a radially expandable tubular hollow body having a lumen and a diameter that increases at one or both end region(s) which, when expanded, is open in the longitudinal direction, a porous shapeable material ( 3 ) which radially sheaths the hollow body at least in certain regions wherein the thickness (T) of the material ( 3 ) decreases at the end region(s) of the hollow body as the diameter of the hollow body ( 1 ) increases in the end region(s), and a drainage means, wherein the drainage means is introduced into the material and which is configured to apply a sub-normal pressure or vacuum in the material, wherein the lumen of the hollow body is sealed so as to be air- and water-tight with respect to the material.
16. A method of using a stent for sealing a leak in a hollow organ of the human or animal body, the stent comprising: a radially expandable tubular hollow body having a lumen and a diameter that increases at one or both end region(s); a porous shapeable material which radially sheaths the hollow body at least in certain regions wherein the thickness (T) of the material ( 3 ) decreases at the end region(s) of the hollow body as the diameter of the hollow body ( 1 ) increases in the end region(s); and a drainage means, wherein the drainage means is introduced into the porous shapeable material and configured to apply a sub-normal pressure or a suction; the method comprising the steps:
(a) introducing the stent into the hollow organ so the leak of the hollow organ is located at the longitudinal side of the stent, (b) expanding the stent to its predetermined size, and (c) applying a subnormal pressure or a suction to the drainage means of the stent.
17. A method according to claim 16 , wherein the step of introducing the stent into the hollow organ comprises introducing the stent into the hollow organ so that the leak of the hollow organ is located in the region of the centre of the longitudinal side of the stent.
18. A method according to claim 16 , wherein the step of expanding the stent comprises expanding the hollow body to its predetermined size.
19. A method according to claim 16 , wherein the step of expanding the stent comprises releasing the stent so it expands to its predetermined size.