Methods of making collagen fiber medical constructs and related medical constructs, including tubes
The disclosure describes methods of winding collagen fiber to make medical constructs and related collagen fiber tube and patch devices.
1. A method of manufacturing a medical construct, comprising:
providing at least one collagen fiber at a length of between about 1 m to about 100 m;
winding the at least one collagen fiber a number of revolutions about a length of a support member having a long axis, the winding having at least one defined pitch and/or fiber angle relative to the long axis of the support member; and
applying at least one layer of a gelatin slurry onto the at least one collagen fiber during the winding step to form a medical construct, wherein the gelatin slurry comprises one or more of the following minerals: calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, monotite, brushite, calcium pyrophosphate, tricalcium phosphate, tetracalcium phosphate, octacalcium phosphate, amorphous calcium phosphate, hydroxyapatite, carbonateapatite, calcite, and/or calcium sulfate.
2. A method according to claim 1 , wherein the gelatin slurry has a gelatin concentration of between about 0.1% to about 40% weight per volume.
3. A method according to claim 1 , wherein the at least one mineral comprises at least one of hydroxyapatite, tricalcium phosphate, and calcium sulfate.
4. A method according to claim 1 , wherein the at least one mineral comprises hydroxyapatite.
5. A method according to claim 1 , wherein the gelatin slurry has a mineral concentration of between about 0.1% to about 30% weight per volume.
6. A method according to claim 1 , further comprising heating the gelatin slurry to a temperature of between about 45° C. and about 55° C. so that the gelatin slurry is in a liquid form during the applying step.
7. A method according to claim 1 , further comprising placing a gel of soluble collagen having a substantially cylindrical shape on the support member before the winding step, then placing a gel of soluble collagen over the at least one collagen fiber during and/or after the winding step.
8. A method according to claim 1 , further comprising placing a gel of soluble collagen comprising one or more minerals on the support member before the winding step to form a rough inner surface of the construct.
9. A method according to claim 8 , wherein the one or more minerals is selected from the following minerals: calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, monotite, brushite, calcium pyrophosphate, tricalcium phosphate, tetracalcium phosphate, octacalcium phosphate, amorphous calcium phosphate, hydroxyapatite, carbonateapatite, calcite, and/or calcium sulfate.
10. A method according to claim 1 , further comprising placing a gel of soluble collagen comprising one or more minerals over the at least one collagen fiber after the applying step to form a rough outer surface of the construct.
11. A method according to claim 10 , wherein the one or more minerals is selected from the following minerals: calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, monotite, brushite, calcium pyrophosphate, tricalcium phosphate, tetracalcium phosphate, octacalcium phosphate, amorphous calcium phosphate, hydroxyapatite, carbonateapatite, calcite, and/or calcium sulfate.
12. A method according to claim 1 , wherein the support member is substantially cylindrical or frustoconical.
13. A method according to claim 1 , wherein the support member is substantially rectangular.
14. A method according to claim 1 , wherein the support member comprises ribs, and the method comprises forming a ribbed pattern on the construct based on direct or indirect contact of the at least one collagen fiber with the ribs.
15. A method according to claim 1 , further comprising allowing the collagen fiber with the gelatin slurry to dry to a low moisture content state to provide a gelatin film, then polymerizing the at least partially dried collagen fiber with the gelatin film using a cross-linking agent selected from the group consisting of: NDGA, carbodiimide, glutaraldehyde, formaldehyde, tannic acid, isocyanates, and epoxy resins.
16. A method according to claim 1 , further comprising allowing the collagen fiber with the gelatin slurry to dry to a low moisture content state to provide a gelatin film, then polymerizing the at least partially dried collagen fiber with the gelatin film using NDGA cross-linking.
17. A method according to claim 1 , wherein the at least one collagen fiber includes at least one collagen fiber bundle.
18. A method according to claim 1 , wherein the winding step is carried out to form multiple overlying layers of the at least one collagen fiber in one or more fiber angles so that the at least one fiber intersects itself at different locations along a length of the construct.
19. A method according to claim 1 , wherein the construct is an allo-graft and/or auto-graft for tendon or ligament implants.
20. A method according to claim 1 , further comprising placing a gel of soluble collagen comprising one or more minerals on the support member before the winding step to form a rough inner surface of the construct and placing a gel of soluble collagen comprising one or more minerals over the at least one collagen fiber after the applying step to form a rough outer surface of the construct,
wherein the one or more minerals in the gel of soluble collagen forming the rough inner surface of the construct and the gel of soluble collagen forming the rough outer surface of the construct are present in a different concentration than the concentration of the one or more minerals in the gelatin slurry.
21. A method according to claim 20 , wherein the gel of soluble collagen forming the rough inner surface of the construct, the gel of soluble collagen forming the rough outer surface of the construct, and the gelatin slurry each comprise at least one different mineral.
22. A method of manufacturing a medical construct, comprising:
placing a soluble collagen gel having a substantially cylindrical shape on an outer surface of a support member;
drying the soluble collagen gel to a low moisture content state to form an inner layer of collagen film on the support member; then
winding at least one collagen fiber about the support member over the collagen film;
applying a gelatin slurry comprising at least one mineral to a surface of the at least one collagen fiber on the support member;
drying the wound collagen fiber with the gelatin slurry to a low moisture content state to form a gelatin film; then
placing a soluble collagen gel over the at least partially dried collagen fiber with the gelatin film; and
drying the applied collagen gel to form an outer layer of collagen film.
23. A method according to claim 22 , wherein the at least one mineral is selected from the following minerals: calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, monotite, brushite, calcium pyrophosphate, tricalcium phosphate, tetracalcium phosphate, octacalcium phosphate, amorphous calcium phosphate, hydroxyapatite, carbonateapatite, calcite, and/or calcium sulfate.
24. A method according to claim 22 , wherein the at least one mineral comprises at least one of hydroxyapatite, tricalcium phosphate, and calcium sulfate.
25. A method according to claim 22 , wherein the at least one mineral comprises hydroxyapatite.
26. A method according to claim 22 , further comprising heating the gelatin slurry to a temperature of between about 45° C. and about 55° C. so that the gelatin slurry is in a liquid form during the applying step.
27. A method according to claim 22 , wherein each of the placing steps are carried out to place multiple layers of the collagen gel.
28. A method according to claim 27 , wherein the multiple layers of collagen gel comprise different components and/or different concentrations of components, and wherein the components are selected from the group consisting of collagen and minerals.
29. A method according to claim 27 , wherein between about 1 to about 10 layers of the collagen gel comprise at least one mineral.
30. A method according to claim 22 , wherein the at least one collagen fiber includes at least one collagen fiber bundle.
31. A method according to claim 22 , further comprising polymerizing the collagen fiber construct while the construct is held on the support member using a cross-linking agent selected from the group consisting of: NDGA, carbodiimide, glutaraldehyde, formaldehyde, tannic acid, isocyanates, and epoxy resins, then removing the support member.
32. A method according to claim 22 , further comprising polymerizing the collagen fiber construct while the construct is held on the support member using NDGA cross-linking, then removing the support member.
33. A method according to claim 22 , wherein the winding step is carried out to form multiple overlying layers of the at least one collagen fiber in one or more fiber angles so that the at least one fiber intersects itself at different locations along a length of the construct.
34. A method according to claim 22 , wherein the applying step is carried out by applying the gelatin slurry onto the at least one collagen fiber during the winding step.
35. A method according to claim 22 , wherein the inner layer of collagen film and/or the outer layer of collagen film comprise one or more minerals, and the one or more minerals in the inner layer of collagen film and/or the outer layer of collagen film are present in a different concentration than the concentration of the at least one mineral in the gelatin slurry.
36. A method according to claim 35 , wherein the at least one mineral in the gelatin slurry is different than the one or more minerals in the inner layer of collagen film and/or the outer layer of collagen film.