摘要:
A method for purifying bone-derived osteoinductive factors including an ultrafiltration process, an anion exchange process, a cation exchange process, and a reverse phase HPLC process. The ultrafiltration process preferably includes a first ultrafiltration step using a membrane having a nominal molecular weight cutoff of approximately 100 kilodaltons (kD) and a second ultrafiltration step employing a membrane having a nominal molecular weight cutoff of approximately 10 kD. For the anion exchange process, a strongly cationic resin is used, preferably having quaternary amine functional groups. Typically, the eluant for the anion exchange process has a conductivity from about 10,260 micromhos (.mu.mhos) (1.026.times.10.sup.-2 siemens (S)) to about 11,200 .mu.mhos (1.120.times.10.sup.31 2 S). For the cation exchange process, a strongly anionic resin is used, preferably having sulfonic acid functional groups. The eluant for the cation exchange process typically has a conductivity from about 39,100 .mu.mhos (3.91.times.10.sup.-2 S) to about 82,700 .mu.mhos (8.27.times.10.sup.-2 S) or more. The HPLC process typically utilizes a column containing hydrocarbon-modified silica packing material. The osteoinductive proteins can be eluted from the HPLC column with an acetonitrile solution in combination with aqueous trifluoracetic acid. The purification processes yield osteoinductively active protein mixtures.
摘要:
Diphosphonate-derivatized macromolecules, such as proteins, suitable for use as technetium-99m-based scanning agents and as anticalcification agents are disclosed. The scanning agents are prepared by combining Tc-99m in a +3, +4 and/or +5 oxidation state with the diphosphonate-derivatized macromolecules. Also disclosed are pharmaceutical compositions containing these diphosphonate-derivatized macromolecules and methods for scintigraphic imaging using these diphosphonate-derivatized macromolecules labeled with Tc-99m.
摘要:
Disclosed is a product which includes calcium carbonate and bone growth factor useful for the promotion of bone formation when implanted in the body. The calcium carbonate is preferably in the form of aragonite which can be recovered from naturally occurring coral. A preferred bone growth factor of the present invention is a protein mixture purified from bone. Also disclosed is a process for the induction of bone formation which includes implanting the product in a body. The product and process of the present invention are particularly useful in hip replacement operations, knee replacement operations, spinal fusion operations, repair of periodontal defects, treatment of osteoporosis, repair of bone tumor defects and repair of bone fractures.
摘要:
A method for purifying bone-derived osteoinductive factors including an ultrafiltration process, an anion exchange process, a cation exchange process, and a reverse phase HPLC process. The ultrafiltration process preferably includes a first ultrafiltration step using a membrane having a nominal molecular weight cutoff of approximately 100 kilodaltons (kD) and a second ultrafiltration step employing a membrane having a nominal molecular weight cutoff of approximately 10 kD. For the anion exchange process, a strongly cationic resin is used, preferably having quaternary amine functional groups. Typically, the eluant for the anion exchange process has a conductivity from about 10,260 micromhos (.mu.mhos) (1.026.times.10.sup.-2 siemens (S)) to about 11,200 .mu.mhos (1.120.times.10.sup.-2 S). For the cation exchange process, a strongly anionic resin is used, preferably having sulfonic acid functional groups. The eluant for the cation exchange process typically has a conductivity from about 39,100 .mu.mhos (3.91.times.10.sup.-2 S) to about 82,700 .mu.mhos (8.27.times.10.sup.-2 S) or more. The HPLC process typically utilizes a column containing hydrocarbon-modified silica packing material. The osteoinductive proteins can be eluted from the HPLC column with an acetonitrile solution in combination with aqueous trifluoracetic acid. The purification processes yield osteoinductively active protein mixtures.
摘要:
Diphosphonate-derivatized macromolecules, such as proteins, suitable for use as technetium-99m-based scanning agents and as anticalcification agents are disclosed. The scanning agents are prepared by combining Tc-99m in a +3, +4 and/or +5 oxidation state with the diphosphonate-derivatized macromoleules. Also disclosed are pharmaceutical compositions containing these diphosphonate-derivatized macromolecules and methods for scintigraphic imaging using these diphosphonate-derivatized macromolecules labeled with Tc-99m.
摘要:
This invention relates to pyrindine-diphosphonic acid derivatives which are useful in treating or preventing diseases characterized by abnormal calcium and phosphate matabolism, in particular those which are characterized by abnormal bone metabolism. This invention further relates to pharmaceutical compositions which contain the novel compounds of the present invention, and to a method of treating or preventing diseases characterized by abnormal calcium and phosphate metabolism utilizing a compound of the present invention.
摘要:
A firm but pliable medical device for use as a bone graft substitute or bone graft extender retains its shape without the requirement of a containment device, such as a syringe. Because the device is solid, it is easy to locate or position in-vivo and, in the moist environment of the body, it will hold its shape well, for an extended time. Because the lyophilized pliable medical device is porous, it adsorbs blood and other beneficial cells containing body fluids, such as bone marrow, contributing to its superior bone repair efficacy in comparison to an analogous putty that has not been lyophilized. In addition these lyophilized pliable medical devices are easier to terminally steam sterilize than the analogous putty because there is no moisture present to boil and “blow-out” of the containment device (syringe). The glycerin that is present in the formulation lends pliability but has a low vapor pressure.
摘要:
A firm but pliable medical device for use as a bone graft substitute or bone graft extender retains its shape without the requirement of a containment device, such as a syringe. Because the device is solid, it is easy to locate or position in-vivo and, in the moist environment of the body, it will hold its shape well, for an extended time. Because the lyophilized pliable medical device is porous, it adsorbs blood and other beneficial cells containing body fluids, such as bone marrow, contributing to its superior bone repair efficacy in comparison to an analogous putty that has not been lyophilized. In addition these lyophilized pliable medical devices are easier to terminally steam sterilize than the analogous putty because there is no moisture present to boil and “blow-out” of the containment device (syringe). The glycerin that is present in the formulation lends pliability but has a low vapor pressure.
摘要:
A method and apparatus for preparing a bone product are provided. The method includes contacting an interior section of a cylindrical bone portion with a high pressure fluid medium such as at least about 1000 psi to remove at least a portion of cancellous bone matrix from the bone portion. Preferably the bone contains less than about 25% by weight cancellous bone. The apparatus includes multiple stations of opposing high pressure nozzles holding the cylindrical bone portion from each end and for contacting the interior surfaces of a bone portion with a fluid medium. The apparatus also includes a third nozzle for contacting the exterior surface of the bone portion with a fluid medium.
摘要:
Disclosed is a cartilage repair product that induces both cell ingrowth into a bioresorbable material and cell differentiation into cartilage tissue. Such a product is useful for regenerating and/or repairing both vascular and avascular cartilage lesions, particularly articular cartilage lesions, and even more particularly mensical tissue lesions, including tears as well as segmental defects. Also disclosed is a method of regenerating and repairing cartilage lesions using such a product.