Volumetric grafts for treatment of fistulae and related methods and systems

1. A medical graft product for the treatment of a fistula having a primary opening in the alimentary canal, a secondary opening, and a fistula tract extending therebetween, the medical graft product comprising:

an elongate graft body of a remodelable matrix material;

said elongate graft body including at least one generally conical longitudinal segment configured to lodge within and fill the primary opening with remodelable extracellular matrix material;

said elongate graft body of a length sufficient to extend from the primary opening through the fistula tract and out the secondary opening when said generally conical segment is lodged within the primary opening;

said generally conical longitudinal segment comprised of a sheet-form extracellular matrix material having a first edge and an opposite second edge such that they are not parallel, said sheet-form extracellular matrix material rolled from said first edge to said second edge to form spiral layers and thereby also form said generally conical longitudinal segment having an interior filled with said spiral layers so as to block the primary opening when received therein;

wherein a first end of said generally conical longitudinal segment has a greater number of compact and bonded spiral layers of sheet-form extracellular matrix material than a second end of said generally conical longitudinal segment;

wherein said spiral layers of sheet-form extracellular matrix material are sufficiently compact and bonded to one another to provide said generally conical longitudinal segment as a substantially unitary structure;

wherein said sheet-form extracellular matrix material has a third edge extending from said first edge to said opposite second edge; and

wherein said third edge is non-orthogonal to said first edge.

2. The medical graft product of claim 1 , wherein the extracellular matrix material comprises submucosa, dura mater, pericardium, basement membrane, or dermal collagen.

3. The medical graft product of claim 1 , wherein the extracellular matrix material comprises a multilaminate extracellular matrix material.

4. The medical graft product of claim 1 , wherein the product comprises at least one protuberance along its surface.

5. The medical graft product of claim 1 also comprising one or more lumens extending longitudinally through the body along at least part of the length of the body.

6. The medical graft product of claim 1 , wherein said bonded spiral layers of sheet-form extracellular matrix material substantially retain their native cross-linking.

7. A method for treating a fistula having a fistula opening, comprising:

providing a product according to claim 1 ; and

positioning said product so as to have at least a portion thereof received in the opening.

8. A medical graft product for the treatment of an anorectal fistula, comprising:

a biocompatible sheet material having a first edge and an opposing second edge such that they are not parallel;

said biocompatible sheet material rolled from said first edge to said second edge to thereby form a rolled biocompatible sheet material having spiral layers filling an interior of the rolled biocompatible sheet material;

said rolled biocompatible sheet material providing a volumetric body, wherein the volumetric body is configured to fill a primary opening of an anorectal fistula with the spiral layers of said rolled biocompatible sheet material;

wherein a head portion defining a first end of said volumetric body has a greater number of spiral layers of biocompatible sheet material than a tail portion defining a second end of said volumetric body;

wherein said biocompatible sheet material has a third edge extending from said first edge to said second edge; and

wherein said third edge is non-orthogonal to said first edge.

9. The medical graft product of claim 8 , wherein the volumetric body comprises a cone having a broader head and a narrower tail.

10. The medical graft product of claim 9 , wherein the head has a cross sectional dimension of from 3 mm to 15 mm.

11. The medical graft product of claim 9 , wherein the tail has a cross sectional dimension of 0.5 mm to 5 mm.

12. The medical graft product of claim 9 , wherein the cone has a length of 0.5 inch to 7 inches.

13. The medical graft product of claim 8 , wherein the rolled biocompatible sheet material substantially retains its native cross-linking.

14. A medical product for the closure of a fistula having a primary opening and a fistula tract, comprising:

a biocompatible graft body configured for receipt in the primary opening; and

a sheath having a lumen, a proximal end, and a distal end, wherein the biocompatible graft body is configured for deployment through the lumen of the sheath and wherein the sheath is configured to traverse the fistula tract and to deploy the biocompatible graft body within the primary opening;

wherein the biocompatible graft body includes a sheet-form material having a first edge and an opposite second edge such that they are not parallel, wherein said sheet-form material is rolled from said first edge to said second edge to thereby form a generally conical longitudinal segment of said biocompatible graft body having spiral layers filling an interior of the generally conical longitudinal segment so as to block the primary opening when received therein;

wherein a first end of said generally conical longitudinal segment has a greater number of spiral layers of sheet-form material than a second end of said generally conical longitudinal segment;

wherein said sheet-form material has a third edge extending from said first edge to said opposite second edge; and

wherein said third edge is non-orthogonal to said first edge.

15. A method for treating a fistula having a primary opening, comprising:

providing a body, wherein the body includes a biocompatible sheet material having a first edge and an opposing second edge, such that the first edge and second edge are not parallel, wherein said biocompatible sheet material is rolled from said first edge to said second edge to thereby form a rolled biocompatible sheet material providing a volumetric body having spiral layers filling an interior of the volumetric body, wherein the volumetric body is configured to fill a primary opening of the fistula; and

locating the provided body within a fistula, wherein a portion of the provided body lodges within and fills the primary opening of the fistula with the spiral layers;

wherein a head portion defining a first end of said volumetric body has a greater number of spiral layers of biocompatible sheet material than a tail portion defining a second end of said volumetric body;

wherein said biocompatible sheet material has a third edge extending from said first edge to said opposing second edge; and

wherein said third edge is non-orthogonal to said first edge.

16. The method of claim 15 , wherein the biocompatible sheet material substantially retains its native cross-linking.

17. A medical graft product for treating a fistula, comprising:

a body, wherein the body includes a biocompatible sheet material having a length and first and second opposing edges extending along a portion of said length such that they are not parallel along at least a portion of said length, wherein said biocompatible sheet material is rolled from said first edge to said second edge to thereby form a rolled biocompatible sheet material providing a volumetric body having spiral layers filling an interior of the volumetric body, wherein the volumetric body is configured to fill at least a portion of a fistula tract with the spiral layers;

wherein a head portion defining a first end of said volumetric body has a greater number of spiral layers of biocompatible sheet material than a tail portion defining a second end of said volumetric body;

wherein said biocompatible sheet material has a third edge extending from said first edge to said second edge; and

wherein said third edge is non-orthogonal to said first edge.

18. The medical graft product of claim 17 , wherein the body comprises a plurality of cuts configured to enhance expansion of the medical graft product within at least a portion of the fistula tract.

19. The medical graft product of claim 17 , wherein the biocompatible sheet material substantially retains its native cross-linking.