Oriented biopolymeric membrane for meningeal tissue repair
View Patent ↗A cell occlusion sheet membrane adapted for repairing a damaged meningeal tissue. The sheet membrane contains a layer of cross-linked, oriented biopolymeric fibers that has a thickness of 0.1 mm to 3.0 mm, a density of 0.1 g/cm 3 to 1.2 g/cm 3 , a hydrothermal shrinkage temperature of 45° C. to 80° C., a suture pullout strength of 0.1 kg to 5 kg, a tensile strength of 10 kg/cm 2 to 150 kg/cm 2 , and permeability to molecules having molecular weights of 200 to 300,000 daltons. Also disclosed is a method for making the membrane.
1. A cell occlusion sheet membrane adapted for the repair of a damaged meningeal tissue comprising a layer of cross-linked, oriented biopolymeric fibers, wherein the membrane has a thickness of 0.1 mm to 3.0 mm, a density of 0.1 g/cm3 to 1.2 g/cm3, a hydrothermal shrinkage temperature of 45° C. to 80° C., a suture pullout strength of 0.1 kg to 5 kg, and a tensile strength of 10 kg/cm2 to 150 kg/cm2, and is permeable to molecules having molecular weights of 200 to 300,000 daltons, wherein the membrane is obtained by cutting a tubular membrane longitudinally and perpendicular to the fiber orientation.
2. The sheet membrane of claim 1 further comprising a second layer of oriented biopolymeric fibers secured to the first layer of oriented biopolymeric fibers, wherein the biopolymeric fibers of the first and second layers are respectively oriented in different directions.
3. The sheet membrane of claim 2 further comprising a third layer of oriented biopolymeric fibers secured to the second layer of oriented biopolymeric fibers, wherein the biopolymeric fibers of the first, second, and third layers are respectively oriented in different directions.
4. The sheet membrane of claim 1 , wherein the biopolymeric fibers are collagen fibers.
5. The sheet membrane of claim 4 further comprising a second layer of oriented collagen fibers secured to the first layer of oriented collagen fibers, wherein the collagen fibers of the first and second layers are respectively oriented in different directions.
6. The sheet membrane of claim 5 further comprising a third layer of oriented collagen fibers secured to the second layer of oriented collagen fibers, wherein the collagen fibers of the first, second, and third layers are respectively oriented in different directions.
7. The sheet membrane of claim 1 , wherein the membrane has a thickness of 0.2 mm to 1.0 mm, a density of 0.2 g/cm3 to 0.8 g/cm3, a hydrothermal shrinkage temperature of 50° C. to 70° C., a suture pullout strength of 0.3 kg to 3 kg, and a tensile strength of 30 kg/cm2 to 80 kg/cm2, and is permeable to molecules having molecular weight cutoff of 70,000 daltons.
8. The sheet membrane of claim 7 further comprising a second layer of oriented biopolymeric fibers secured to the first layer of oriented biopolymeric fibers, wherein the biopolymeric fibers of the first and second layers are respectively oriented in different directions.
9. The sheet membrane of claim 8 further comprising a third layer of oriented biopolymeric fibers secured to the second layer of oriented biopolymeric fibers, wherein the biopolymeric fibers of the first, second, and third layers are respectively oriented in different directions.
10. The sheet membrane of claim 4 , wherein the membrane has a thickness of 0.2 mm to 1.0 mm, a density of 0.2 g/cm3 to 0.8 g/cm3, a hydrothermal shrinkage temperature of 50° C. to 70° C., a suture pullout strength of 0.3 kg to 3 kg, and a tensile strength of 30 kg/cm2 to 80 kg/cm2, and permeable to molecules having molecular weight cutoff of 70,000 daltons.
11. The sheet membrane of claim 10 further comprising a second layer of oriented collagen fibers secured to the first layer of oriented collagen fibers, wherein the collagen fibers of the first and second layers are respectively oriented in different directions.
12. The sheet membrane of claim 11 further comprising a third layer of oriented collagen fibers secured to the second layer of oriented collagen fibers, wherein the collagen fibers of the first, second, and third layers are respectively oriented in different directions.
13. The sheet membrane of claim 1 further comprising a bioactive agent.
14. The sheet membrane of claim 4 further comprising a bioactive agent.
15. The sheet membrane of claim 7 further comprising a bioactive agent.
16. The sheet membrane of claim 10 further comprising a bioactive agent.
17. A method of making a cell occlusion single-layer sheet membrane of oriented biopolymeric fibers, said method comprising:
reconstituting biopolymeric fibers dispersed in a solution;
placing the reconstituted biopolymeric fibers around a mandrel;
rotating the mandrel to convert the reconstituted biopolymeric fibers on the mandrel into a tubular membrane of oriented biopolymeric fibers;
cutting the tubular membrane longitudinally and perpendicular to the fiber orientation;
rolling the cut membrane into a tubular form that is an inversion of the tubular membrane;
inserting the rolled membrane into a tubular mesh; and
crosslinking the biopolymeric fibers, thereby forming a sheet membrane of oriented biopolymeric fibers.
18. The method of claim 17 , wherein the biopolymeric fibers are collagen fibers.
19. The sheet membrane prepared by the method of claim 17 .
20. The sheet membrane prepared by the method of claim 18 .