Plasticized bone and soft tissue grafts and methods of making and using same

• US 20030083752A1
• Filed: 08/29/2001
• Published: 05/01/2003
• Est. Priority Date: 06/30/1998
• Status: Abandoned Application

• Current Assignee: LifeNet Health, Inc.
• Original Assignee: LifeNet Health, Inc.
• Inventors: Anderson, Billy G., Wolfinbarger, Lloyd Jr., OʼLeary, Robert K.
• Application Number:
  US09/940,545
• Publication Number:
  US 20030083752A1
• Time in Patent Office: Days
• US Class Current: 623/23.63
• CPC Class Codes: A61F 2/02 Prostheses implantable into the body closure means for urethra or rectum or for artificial body openings therefor A61F2/0004
• CPC Class Codes: A61F 2/4644 Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material bone material A61F2/28; disintegrating or milling devices B02C
• CPC Class Codes: A61F 2002/2825 Femur
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/2839 Bone plugs or bone graft dowels
• CPC Class Codes: A61F 2002/30535 Special structural features of bone or joint prostheses not otherwise provided for
• CPC Class Codes: A61F 2002/4646 Devices for cleaning bone graft
• CPC Class Codes: A61F 2002/4649 Bone graft or bone dowel harvest sites
• CPC Class Codes: A61F 2250/0058 Additional features; Implant or prostheses properties not otherwise provided for
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 27/3608 Bone, e.g. demineralised bone matrix [DBM], bone powder
• CPC Class Codes: A61L 27/362 Skin, e.g. dermal papillae
• CPC Class Codes: A61L 27/365 Bones
• CPC Class Codes: A61L 27/3683 subjected to a specific treatment prior to implantation, e.g. decellularising, demineralising, grinding, cellular disruption/non-collagenous protein removal, anti-calcification, crosslinking, supercritical fluid extraction, enzyme treatment
• CPC Class Codes: A61L 27/502 Plasticizers

Abstract

The present invention provides a plasticized dehydrated or freeze-dried bone and/or soft tissue product that does not require special conditions of storage, for example refrigeration or freezing, exhibits materials properties that approximate those properties present in normal hydrated tissue, is not brittle, does not necessitate rehydration prior to clinical implantation and is not a potential source for disease transmission. The invention replaces water in the molecular structure of the bone or soft tissue matrix with one or more plasticizers allowing for dehydration of the tissue, yet not resulting in an increase in brittleness of the plasticized product, and resulting in compressive and/or tensile properties similar to those of normal hydrated bone. Replacement of the chemical plasticizers by water prior to implantation is not required and thus, the dehydrated bone or soft tissue plasticized product can be placed directly into an implant site without significant preparation in the operating room.

Claims

1. A plasticized bone graft, comprising:

a cleaned bone graft comprising one or more plasticizers.

9. The bone graft of any one of claims 1, 2, or 3, wherein said bone graft is suitable for direct transplant into a human without rehydration.

14. The bone graft of any one of claims 1, 2, or 3, wherein said bone graft is a non-demineralized bone graft.

15. The bone graft of any one of claims 1, 2, or 3, wherein said bone graft is a load-bearing bone graft.

2. A plasticized bone graft suitable for transplantation into a human, comprising:

a bone graft having an internal matrix essentially free from bone marrow elements; and

one or more plasticizers contained in said internal matrix.

3. A plasticized bone graft, comprising:

a cleaned bone graft; and

one or more plasticizers, wherein said cleaned bone graft is impregnated with said one or more plasticizers.

4. A method for producing a plasticized bone graft suitable for transplantation into a human, comprising:

impregnating a cleaned bone graft with one or more plasticizers to produce a plasticized bone graft.

5. The method of claim 4, said step of impregnating, comprising:

incubating said cleaned bone graft with a plasticizer composition comprising one or more plasticizers and one or more biocompatible solvents.

6. The method of claim 5, wherein said one or more biocompatible solvents comprise one or more alcohols.

7. The method of claim 5, wherein incubating comprises soaking said cleaned bone graft in said plasticizer composition.

8. The method of claim 7, wherein said soaking is carried out under negative pressure.

10. The method of claim 4, wherein said cleaned bone graft is essentially free from bone marrow elements.

11. The method of claim 6, wherein said one or more plasticizers are present in said plasticizer composition in a weight ratio of from 30 to 90 wt %, and said one or more alcohols are present in said plasticizer composition in a weight ratio of from 10 to 70 wt %.

12. The method of claim 11, wherein said plasticizer is glycerol and said alcohol is isopropyl alcohol.

13. The method of claim 12, wherein said glycerol is present at 30 wt % and said isopropyl alcohol is present at 70 wt %.

16. A plasticized soft tissue graft suitable for transplantation into a human, comprising:

a cleaned soft tissue graft having an internal matrix; and

one or more plasticizers contained in said internal matrix.

24. The soft tissue graft of any one of claims 16, 17, or 18, wherein said soft tissue graft is suitable for direct transplant into a human without rehydration.

28. The soft tissue graft of any one of claims 16, 17, or 18, wherein said soft tissue graft is a load-bearing soft tissue graft.

29. The soft tissue graft of any one of claims 16, 17, or 18, wherein said soft tissue graft is selected from the group consisting of:

dura, pericardium, fascia lata, tendons and ligaments.

17. A plasticized soft tissue graft, comprising:

a cleaned, soft tissue graft; and

one or more plasticizers, wherein said cleaned soft tissue graft is impregnated with said one or more plasticizers.

18. A plasticized soft tissue graft, comprising:

a cleaned, soft tissue graft comprising one or more plasticizers.

19. A method for producing a plasticized soft tissue graft suitable for transplantation into a human, comprising:

impregnating a cleaned, soft tissue graft with one or more plasticizers to produce a plasticized soft tissue graft.

20. The method of claim 19, said step of impregnating, comprising:

incubating said cleaned, soft tissue graft with a plasticizer composition comprising one or more plasticizers and one or more biocompatible solvents.

21. The method of claim 20, wherein said one or more biocompatible solvents comprise one or more alcohols.

22. The method of claim 20, wherein incubating comprises soaking said cleaned, soft tissue graft in said plasticizer composition.

23. The method of claim 22, wherein said soaking is carried out under negative pressure.

25. The method of claim 21, wherein said one or more plasticizers are present in said plasticizer composition in a weight ratio of from 30 to 90 wt %, and said one or more alcohols are present in said plasticizer composition in a weight ratio of from 10 to 70 wt %.

26. The method of claim 25, wherein said plasticizer is glycerol and said alcohol is isopropyl alcohol.

27. The method of claim 26, wherein said glycerol is present at 30 wt % and said isopropyl alcohol is present at 70 wt %.

30. A plasticized bone graft, comprising:

a cleaned, non-demineralized bone graft comprising one or more plasticizers.

31. A plasticized load-bearing, bone graft, comprising:

a cleaned, load-bearing bone graft comprising one or more plasticizers.

32. A plasticized load-bearing soft tissue graft, comprising:

a cleaned, load-bearing soft tissue graft comprising one or more plasticizers.