Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Implant or insert
Patent
1997-01-13
1998-09-29
Naff, David M.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Implant or insert
424548, 435 681, 435267, 514 21, 530356, 530402, 530412, A61F 200, A61K 3817, C12P 2106, C07K 114
Patent
active
058143289
ABSTRACT:
Purified collagen is produced by contacting a collagen sample with a first proteolytic enzyme, a reducing agent and a second proteolytic enzyme. Preferably, the first and second proteolytic enzymes are papain and the reducing agent is sodium sulfide, dithiothreitol, glutathionine or sodium borohydride. The purified collagen may be contacted with a delipidation agent such as chloroform or methanol and with a phosphorylation agent such as sodium trimetaphosphate to form a biocompatible collagen. Prior to phosphorylation, the delipidated collagen may be treated by compressing, dehydrating, dispersing and drying to form collagen fibers. Also, prior to phosphorylation, the delipidated collagen may be subjected to filter-sterilizing. De-epithelializing of the collagen may carried out prior to treating with the first proteolytic enzyme. The purified and biocompatible collagen may be used in transplantation or hemostasis, and may be provided with compounds such as antimicrobials, antivirals, growth factors and other compounds suitable for biomedical use.
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