Implantable pouch with segmental lamination structure, and related methods of manufacture and use

1. An implantable pouch product, comprising:

a first collagen-containing wall material defining a first side of the pouch product;

a second collagen-containing wall material defining a second side of the pouch product; said first collagen-containing wall material and said second collagen-containing wall material connected by a fold between said first collagen-containing wall material and said second collagen-containing wall material;

a first segment of the first collagen-containing wall material laminated to a first segment of the second collagen-containing wall material to define a pocket periphery laminate material;

a pocket defined between a second segment of the first collagen-containing wall material and a second segment of the second collagen-containing wall material that are not laminated to one another, the pocket being bounded by the pocket periphery laminate material;

wherein at least a portion of the pocket periphery laminate material forms a bonded flange positioned inward of the fold occurring between the first collagen-containing wall material and the second collagen-containing wall material;

the first segment of the first collagen-containing wall material has an average density greater than that of the second segment of the first collagen-containing wall material; and

the first segment of the second collagen-containing wall material has an average density greater than that of the second segment of the second collagen-containing wall material.

2. The product of claim 1 , wherein the pocket periphery laminate material has an average porosity that is greater than an average porosity of the first collagen-containing wall material and an average porosity of the second collagen-containing wall material.

3. The product of claim 1 , wherein the first and second collagen-containing wall materials comprise an extracellular matrix tissue.

4. The product of claim 1 , also comprising a plurality of through-openings defined in at least one of said first and second collagen containing wall materials.

5. The product of claim 1 , wherein the pocket periphery laminate material extends outward from a periphery of the pocket.

6. The product of claim 1 , wherein the pocket periphery laminate material extends inward from a periphery of the pocket.

7. The product of claim 1 , also comprising at least one tunnel drain opening extending through the pocket periphery laminate material.

8. The product of claim 7 , having an opening to the pocket occurring at a side of the product that is generally opposite to the at least one tunnel drain.

9. The product of claim 1 , also comprising at least one suture stitch that reinforces the pocket periphery laminate material against delamination.

10. The product of claim 1 , also comprising at least one reinforcement material, wherein the at least one reinforcement material is attached within the pocket periphery laminate material, adjacent to a terminus of the pocket periphery laminate material, or overlapping a terminus of the pocket periphery laminate material and a region adjacent to the pocket periphery laminate material.

11. The product of claim 1 , wherein the first collagen-containing wall material is a laminate material and the second collagen-containing wall material is a laminate material.

12. The product of claim 5 , also comprising an outer flange extending outward from the pocket periphery laminate material, and outer flange comprising a third segment of the first collagen-containing wall material and a third segment of the second collagen-containing wall material.

13. An implantable product, comprising:

an implantable pouch product of claim 1 ; and

a medical device received in the pocket of the implantable pouch product.