Connect public, paid and private patent data with Google Patents Public Datasets

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

Download PDF

Info

Publication number
US20030083752A1
US20030083752A1 US09940545 US94054501A US2003083752A1 US 20030083752 A1 US20030083752 A1 US 20030083752A1 US 09940545 US09940545 US 09940545 US 94054501 A US94054501 A US 94054501A US 2003083752 A1 US2003083752 A1 US 2003083752A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
bone
tissue
graft
soft
grafts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09940545
Inventor
Lloyd Wolfinbarger
Robert O'Leary
Billy Anderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lifenet
Original Assignee
Lloyd Wolfinbarger
O'leary Robert K.
Anderson Billy G.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/36Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix
    • A61L27/3604Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix characterised by the human or animal origin of the biological material, e.g. hair, fascia, fish scales, silk, shellac, pericardium, pleura, renal tissue, amniotic membrane, parenchymal tissue, fetal tissue, muscle tissue, fat tissue, enamel
    • A61L27/362Skin, e.g. dermal papillae
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4644Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/36Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix
    • A61L27/3604Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix characterised by the human or animal origin of the biological material, e.g. hair, fascia, fish scales, silk, shellac, pericardium, pleura, renal tissue, amniotic membrane, parenchymal tissue, fetal tissue, muscle tissue, fat tissue, enamel
    • A61L27/3608Bone, e.g. demineralised bone matrix [DBM], bone powder
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/36Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix
    • A61L27/3641Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix characterised by the site of application in the body
    • A61L27/3645Connective tissue
    • A61L27/365Bones
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/36Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix
    • A61L27/3683Materials for grafts or prostheses or for coating grafts or prostheses containing ingredients of undetermined constitution or reaction products thereof, e.g. transplant tissue, natural bone, extracellular matrix 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L27/502Plasticizers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/28Bones
    • A61F2002/2825Femur
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/28Bones
    • A61F2002/2835Bone graft implants for filling a bony defect or an endoprosthesis cavity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/28Bones
    • A61F2002/2835Bone graft implants for filling a bony defect or an endoprosthesis cavity
    • A61F2002/2839Bone plugs or bone graft dowels
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4644Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material
    • A61F2002/4646Devices for cleaning bone graft
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4644Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material
    • A61F2002/4649Bone graft or bone dowel harvest sites
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058Additional features; Implant or prostheses properties not otherwise provided for
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L2430/00Materials or treatment for tissue regeneration
    • A61L2430/02Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants

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.

Description

    FIELD OF THE INVENTION
  • [0001]
    The present invention provides a plasticized dehydrated 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 and does not necessitate rehydration prior to clinical implantation. 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. The present plasticized graft does not need rehydration, possesses adequate materials properties, and is not a potential source for disease transmission.
  • BACKGROUND OF THE INVENTION
  • [0002]
    Bone tissue is a homogeneous material comprised of osteoid and minerals. The osteoid is a viscous gel-like material comprised primarily of type I collagen (approximately 90%), proteoglycans, and various sulfated and non-sulfated mucopolysaccharides. The mineral component consists primarily of a crystalline form of calcium phosphate, hydroxy apatite, with amounts of calcium carbonate, tricalcium phosphate, and smaller amounts of other forms of mineral salts. This bone tissue is laid down around cells called osteocytes and these cells are found in small interconnected channels (lacunnae) which are interconnected through a series of channels comprising the Haversian canal system. At the level of the microscope, it is possible to observe that bone tissue is organized into osteons of compact bone made of concentric, perivascular layers of highly coaligned mineralized collagen fiber bundles. The predominant orientation within a single layer varies with respect to the vascular axis and various combinations of orientation in successive lamellae result in variable overall collagen orientation within each osteon. Differences in overall collagen orientation are directly reflected in differing mechanical behavior of single osteons. Transversely oriented collagen results in better resistance to compressive loading along the axis, whereas predominant longitudinal orientation results in better resistance to tensile stress. The predominant orientation of collagen within a cross-section of long bone is not random, but matches the expected distribution of mechanical stress across the section, and its rotational shift along the whole shaft. More transverse collagen is deposited at sites of compressive loading, and more longitudinal collagen is deposited at sites of tensile stress. These structural oriented bone tissues in a load bearing bone are presumed to be laid down by the osteocytes present in the bone and bone remodeling mediates mechanical adaptation in compact bone.
  • [0003]
    A bone is typically comprised of bone tissue in the form of cortical and trabecular bone. Cortical bone is frequently referred to as compact bone and is the major load-bearing part of a bone. Trabecular bone is present in what is typically referred to as cancellous bone where it appears as a densely interconnected structure of “spongy” bone. Spongy bone in a typical bone contains the hemotopoietic cellular elements which is called bone marrow. Trabecular bone can be described as forming a cross-bracing lattice between cortical bone in a bone. It is important to emphasize a need to differentiate between “a bone” and “bone” (as a tissue). A bone is comprised of bone tissue present as cortical and cancellous (spongy) bone.
  • [0004]
    The mineralized osteoid typical of bone tissue is hydrated along the organic molecular structure and is an essential element of the mineral structure. Hydrating molecules of water form complex molecular associations with these organic and non-organic elements of bone tissue and can be described as being tightly bound, loosely bound, and free. Free water and loosely bound water can frequently be removed from bone tissue with only minor changes in the overall mechanical characteristics of the bone tissue. Tightly bound water can be removed only under extreme conditions and results in significant changes in the physical and mechanical properties of bone tissue. In fresh bone, water serves a solvating function in bone tissue allowing proper orientation and molecular spacing of the collagen fibrils which maintain structural alignment of the mineral phase in association with the organic phase.
  • [0005]
    Bone tissue in the form of bone grafts for implantation into a patient, is typically preserved and provided in a dehydrated state. Dehydration of bone tissue through drying, whether by air drying or sublimation as in freeze-drying, results in alteration of the molecular structure of the bone tissue and as a result of the reorientation of the collagen fibrils and the crystalline mineral phase, stress accumulates in the bone tissue. This stress can be relieved by rehydration or by the occurrence of small or large dislocations of structure. Small dislocations are designated micro fractures and are not usually visible to the naked eye. Large dislocations are designated fractures and are usually visible to the naked eye.
  • [0006]
    In a long bone, for example a femur, tibia, fibula, or humerus, the shaft separates the proximal and distal ends of the long bone. The shaft serves to focus loads applied to the whole bone into a smaller diameter than found at the proximal and distal ends of the long bone and the shaft of a long bone is typically of a cylindrical shape and is comprised of compact (cortical) bone. Loads applied along the axis of the shaft require that the cortical bone maintain a constant circumference, i.e. the tendency to failure would distort the bone tissue perpendicular to the axis of load application. Thus, the orientation of the collagen fibers should be such that tensile stress is resisted along the axis of loading and compressive stress is resisted perpendicular to loading. Drying of shaft portions of long bones results in reorientation of collagen fibers and the mineral phase such that changes in the circumferential orientation create stress within the bone matrix which can be relieved only by rehydration or occurrence of a fracture which allows a reorientation approximating the original orientation. In dehydrated cortical ring grafts cut from shafts of long bones, this stress release can present as a fracture along the long axis of the bone shaft leaving a circumference which approximates the circumference of the cortical ring graft prior to drying. By rehydrating bone grafts prior to implantation, the potential for fracture formation which can compromise the function of the bone product can be reduced, but not eliminated. Fractures as discussed above can occur in dehydrated bone prior to rehydration and result in a graft having compromised biomechanical properties, which in turn can result in graft failure when implanted in a patient.
  • [0007]
    Load-bearing soft tissue grafts such as ligaments, tendons, and fascia lata are frequently provided in a freeze-dried state. Such grafts must be rehydrated prior to clinical implantation. Such soft tissue grafts typically contain collagen, elastin, and assorted proteoglycans and mucopolysaccharides. The collagens and elastins are the load-bearing component(s) of these soft tissue grafts and the assorted proteoglycans and polysaccharides serve to bind the fibrillar collagens into a matrix-like structure. The structural organization of fascia lata is similar to dura mater in being somewhat isotropic in load-bearing properties (Wolfinbarger, L, Zhang, Y, Adam, BLT, Homsi, D, Gates, K, and Sutherland, V, 1994, “Biomechanical aspects on rehydrated freeze-dried human allograft dura mater tissues, J. Applied Biomaterials, 5:265-270) whereas tendons (for example the Achilles tendon) or ligaments (for example the Anterior cruciate ligament) are typically anisotropic in load-bearing properties. In these types of load-bearing soft tissue grafts, the tensile properties of the tissues depend on the flexibility of the collagenous structures to stretch under load and return to their original dimensions upon removal of the load.
  • [0008]
    A wide variety of bone and soft tissue products are used in veterinary, medical, orthopaedic, dental, and cosmetic surgery applications. These bone and soft tissue products can be used in load-bearing and non-load bearing applications and the bone and soft tissue products can be supplied under a variety of forms. Bone products are provided as fresh-frozen, freeze-dried, rehydrated freeze-dried, air-dried, organic solvent preserved, or provided preserved by other similar types of preservation methods. Each method of preservation ofbone products possesses selected advantages and disadvantages and thus the method of preservation is generally modified to select for specific needs of a given bone graft. Soft tissue products are typically provided as fresh-frozen or freeze-dried and each method of preservation of soft tissue products possess selected advantages and disadvantages and thus the method of preservation is generally modified to select for specific needs of a given soft tissue product.
  • [0009]
    Bone and soft tissue products preserved and stored by methods involving freeze-drying (removal of water by sublimation) yield a bone or soft tissue product which is significantly more brittle than normal bone and has a tendency to fracture into numerous small pieces, which ultimately can result in graft failure. Specifically, freeze-drying causes grafts to be brittle and typically causes shrinkage where the shrinkage is often not uniform, thereby causing graft failure; solvent preservation using for example, acetone or alcohol, can cause irreversible denaturation of proteins, and solubilization of solvent soluble components, including for example, lipids. These alterations in materials properties of the bone and soft tissue products necessitates a rehydration step in preparation of the bone and soft tissue product for implantation. However, rehydration does not solve the problem, grafts can fracture prior to rehydration, thereby making rehydration futile, and if there are micro fractures prior to rehydration they remain after rehydration. These grafts are more likely to fail regardless of whether they are rehydrated. Even after rehydration the materials properties do not approximate the materials properties of normal bone.
  • [0010]
    Bone and soft tissue products are generally separated into load bearing and non-load bearing products. Examples of non-load bearing bone products are ground demineralized bone which are used for inducing new bone formation in a particular implant site. Load-bearing bone products are rarely demineralized and are used at implant sites where the bone graft will be expected to withstand some level of physical load(s). It is therefore important that load bearing bone products not fail during normal movement(s) of the implant recipient and that the bone product not stimulate a pronounced physiological response. The majority of bone products are provided in either the fresh-frozen or freeze-dried format. The fresh-frozen format is undesirable because it includes donor derived bone marrow and is thus immunogenic and a source of disease transmission. The freeze-dried format is less of a problem than fresh-frozen grafts in the potential for disease transmission, however a freeze-dried bone graft is significantly more brittle than normal bone, more brittle than fresh frozen bone, and must be rehydrated prior to clinical usage. In that clinicians typically do not have time to adequately rehydrate bone graft products in the operating room, it is advantageous to provide a dehydrated or freeze-dried bone product which does not need rehydration, possesses adequate materials properties, and is not a potential source for disease transmission.
  • SUMMARY OF THE INVENTION
  • [0011]
    It is an objective of the present invention to provide implantable, non-demineralized, load-bearing bone products which are mechanically stabilized in a dehydrated state by use of biocompatible plasticizers.
  • [0012]
    It is a further objective of the present invention to provide implantable, load-bearing, soft tissue products which are mechanically stabilized in a dehydrated state by use of biocompatible plasticizers.
  • [0013]
    It is also an objective of the present invention to provide implantable, load-bearing, bone products which do not require rehydration.
  • [0014]
    It is yet a further objective of the present invention to provide implantable, load-bearing, soft tissue products which do not require rehydration.
  • [0015]
    It is an objective of the present invention to provide methods of plasticizing load-bearing bone and soft tissue products.
  • [0016]
    It is a further objective of the present invention to provide plasticized bone and soft tissue products which are resistant to proliferation of microorganisms.
  • [0017]
    It is yet a further objective of the present invention to provide bone and soft tissue products which can be stored at room temperature using conventional packaging.
  • [0018]
    It is a further objective of the present invention to provide plasticized bone and soft tissue products where the plasticizer can be readily removed prior to implantation.
  • [0019]
    It is a further objective of the present invention to use plasticizers to plasticize bone and soft tissue products which are not toxic to a recipient of the plasticized bone or soft tissue graft.
  • [0020]
    It is yet a further objective of the present invention to provide implantable load-bearing bone and soft tissue products which are similar in physical, chemical, and biological properties as compared to normal tissue (fresh bone or fresh soft tissues) yet lack the inherent disadvantages (including for example, potential disease transmission, increased immunogenicity, and a tissue (e.g. bone marrow) which can yield toxic degradation products and/or retard graft incorporation) of fresh-frozen, dehydrated, and freeze-dried bone and/or soft tissue products.
  • [0021]
    It is a further objective of the present invention to provide a plasticized bone graft suitable for transplantation into a human, including a non-demineralized bone graft having an internal matrix essentially free from bone marrow elements; and one or more plasticizers contained in the internal matrix.
  • [0022]
    It is an object of the present invention to provide a plasticized bone graft, including a cleaned, non-demineralized, bone graft; and one or more plasticizers, where the cleaned non-demineralized bone graft is impregnated with the one or more plasticizers.
  • [0023]
    It is yet a further objective of the present invention to provide a plasticized bone graft, including a cleaned, non-demineralized, bone graft including one or more plasticizers.
  • [0024]
    It is a further objective of the present invention to provide a method for producing a plasticized bone graft suitable for transplantation into a human, by impregnating a cleaned, non-demineralized, bone graft with one or more plasticizers to produce a plasticized bone graft.
  • [0025]
    Plasticity of soft tissues depends primarily on the waters of hydration present in the matrix structure, where water movement under a load is restricted by the viscous nature of the proteoglycan/polysaccharide component, and bound waters of hydration in the collagen component affect the flexibility of the tensile component of the tissue(s). The present invention deals with the plasticization of these load bearing tissue constructs where the water removed is replaced with one or more plasticizers including for example, glycerol (glycerin USP) (liquid substitution) such that the graft does not need to be rehydrated or washed to remove the plasticizer prior to clinical implantation.
  • [0026]
    The present invention provides a dehydrated or freeze-dried plasticized bone or soft tissue product, preferably containing less than 5% residual moisture, which product requires no or minimal processing just prior to clinical implantation. The present invention solves prior art problems of grafts having insufficient materials properties, graft brittleness, and the necessity for rehydration prior to clinical implantation, by providing a plasticized dehydrated bone and/or soft tissue product that exhibits materials properties that approximate those properties present in normal hydrated tissue, is not brittle and does not necessitate rehydration prior to implantation.
  • DETAILED DESCRIPTION
  • [0027]
    I. Definitions:
  • [0028]
    The below definitions serve to provide a clear and consistent understanding of the specification and claims, including the scope to be given such terms.
  • [0029]
    Alcohol. By the term “alcohol” is intended for the purposes of the present invention, one of a series of organic chemical compounds in which a hydrogen attached to carbon is replaced by a hydroxyl. Suitable alcohols useful in the plasticizer composition of the present invention preferably include C1-C10 alcohols, and more preferably ethanol and isopropyl alcohol.
  • [0030]
    Allowash™ Solution. By the term “Allowash™ Solution” is intended those detergent compositions disclosed in co-pending U.S. patent application Ser. No. 08/620,856 incorporated herein by reference. Examples of suitable Allowash compositions include: a cleaning composition containing essentially about 0.06 wt % polyoxyethylene-4-lauryl ether, about 0.02 wt % poly (ethylene glycol)-p-nonyl-phenyl-ether; about 0.02 wt % octyphenol-ethyleneoxide and endotoxin free deionized/distilled water.
  • [0031]
    Biocompatible. By the term “biocompatible” is intended for the purposes of the present invention, any material which does not provoke an adverse response in a patient. For example, a suitable biocompatible material when introduced into a patient does not itself provoke a significant immune response, and is not toxic to the patient.
  • [0032]
    Biomechanical strength. By the term “biomechanical strength” is intended for the purposes of the present invention, those properties exhibited by a tissue graft including loading strength, compressive strength, and tensile strength.
  • [0033]
    Bone graft. By the term “bone graft” is intended for the purposes of the present invention, any bone or piece thereof obtained from a donor for example a human or animal and/or cadaver donor, including for example any essentially intact bone graft including for example the femur, tibia, ilia, humorous, radius, ulna, ribs, whole vertebrae, mandibula and/or any bone which can be retrieved from a donor with minimal cutting of that bone for example, one half of an ulna, a femur cut in half to yield a proximal half and a distal half, femoral head, acetabula, distal femur, femur shaft, hemi-pelvi, humerus shaft, proximal femur, proximal femur with head, proximal humeri, proximal tibia, proximal tibia/plateaus, talus, tibia shaft, humeral head, ribs, and/or at least a substantial portion of a whole bone, i.e. at least one-quarter of a whole bone; and/or any cut bone grafts including for example an iliac crest wedge, a Cloward dowel, a cancellous cube, a fibular strut, cancellous block, a crock dowel, femoral condyles, femoral ring, femur segment, fibula segment, fibular wedge, tibia wafer, ilium strip, Midas Rex dowel, tibial segment, and radius/ulna wedge.
  • [0034]
    Bone marrow elements. By the term “bone marrow elements” is intended for the purposes of the present invention, the highly cellular hemotopoietic connective tissue filling the medullary cavities and spongy epiphysis of bones which may harbor bacterial and/or viral particles and/or fungal particles, and includes for example, blood and lipid.
  • [0035]
    Cleaned bone graft. By the term “cleaned bone graft” is intended for the purposes of the present invention, a bone graft that has been processed using means know in the art, to remove bone marrow elements.
  • [0036]
    Dehydrated bone or soft tissue. By the term “dehydrated bone or soft tissue” is intended bone tissue or soft tissue which is preserved by dehydration, such drying methods including for example, freeze-drying, and/or sublimation and/or air drying and/or liquid substitution.
  • [0037]
    Essentially free from. By the term “essentially free from” is intended for the purposes of the present invention, a bone graft where the material removed (i.e., bone marrow elements) from the bone graft is not detectable using detection means known in the art at the time of filing of this application.
  • [0038]
    Incubating. By the term “incubating” is intended for the purposes of the present invention, processing a bone graft in for example a plasticizer composition by soaking the graft in the composition, shaking the graft with the composition, subjecting the graft to flow of the composition where the flow is induced by negative or positive pressure, subjecting the graft and/or the composition to negative or positive pressure, or soaking the bone graft in a plasticizer composition in a negative pressure environment.
  • [0039]
    Impregnating. By the term “impregnating” is intended for the purposes of the present invention, any processing conditions which result in filling the internal matrix of a bone graft with a plasticizer composition.
  • [0040]
    Internal matrix. By the term “internal matrix” is intended for the purposes of the present invention, the spongy epiphysis of bones, the intercellular substance of bone tissue including collagen fibers and inorganic bone salts; or in soft tissue, the intercellular substance of such soft tissue including for example ligaments and tendons, including collagen and elastin fibers and base matrix substances.
  • [0041]
    Load-bearing. By the term “load-bearing” is intended for the purposes of the present invention a non-demineralized bone product or soft tissue product for implantation in a patient at a site where the bone graft or soft tissue graft will be expected to withstand some level of physical load(s).
  • [0042]
    Materials properties. By the term “materials properties” is intended for the purposes of the present invention, those properties present in normal fresh bone which include for example, loading strength, compressive strength, tensile strength, and deformability.
  • [0043]
    Negative pressure. By the term “negative pressure” is intended for the purposes of the present invention, a pressure below atmospheric pressure, i.e. below 1 atm.
  • [0044]
    Normal bone or soft tissue. By the term “normal bone or soft tissue” is intended for the purposes of the present invention, fresh hydrated autogenous and/or fresh-frozen hydrated allograft tissue including for example, bone, fascia, ligaments, and tendons.
  • [0045]
    Permeation enhancer. By the term “permeation enhancer” is intended for the purposes of the present invention, any agent including for example, isopropyl alcohol, that facilitates penetration of the one or more plasticizers or plasticizer composition into the bone or soft tissue. In the case of isopropyl alcohol, permeation is enhanced due to the reduced surface tension of the alcoholic solution.
  • [0046]
    Plasticization. By the term “plasticization” is intended for the purposes of the present invention, replacing free and loosely bound waters of hydration in a tissue(s) with one or more plasticizers without altering the orientation of the collagen fibers and associated mineral phase.
  • [0047]
    Plasticizer. By the term “plasticizer” is intended for the purposes of the present invention, any biocompatible compounds which are soluble in water and can easily displace/replace water at the molecular level and preferably have a low molecular weight such that the plasticizer fits into the spaces available to water within the hydrated molecular structure of the bone or soft tissue. Such plasticizers are preferably not toxic to the cellular elements of tissue into which the graft is to be placed, or alternatively, the plasticizer is easily removed from the graft product prior to implantation. Suitable plasticizers are preferably compatible with and preferably readily associates with the molecular elements of the bone tissue and/or soft tissue. Suitable plasticizers include for example: glycerol (glycerin USP), adonitol, sorbitol, ribitol, galactitol, D-galactose, 1,3-dihydroxypropanol, ethylene glycol, triethylene glycol, propylene glycol, glucose, sucrose, mannitol, xylitol, meso-erythritol, adipic acid, proline, hydroxyproline or similar water-soluble small molecular weight solutes which can be expected to replace water in the base matrix structure of bone tissue and/or soft tissue and provide the hydrating functions of water in that tissue. Suitable solvents include for example: water, alcohols, including for example ethanol and isopropyl alcohol.
  • [0048]
    Plasticizer composition. By the term “plasticizer composition” is intended for the purposes of the present invention, any composition which includes one or more plasticizers and one or more biocompatible solvents. Suitable solvents include for example: water, and alcohols, including for example C1-C10 alcohols, and more preferably ethanol and isopropyl alcohol.
  • [0049]
    Positive pressure. By the term “positive pressure” is intended for the purposes of the present invention, a pressure above atmospheric pressure, i.e. above 1 atm.
  • [0050]
    Rehydration. By the term “rehydration” is intended for the purposes of the present invention, hydrating a dehydrated plasticized tissue graft or a dehydrated non-plasticized tissue graft, with water, for example, prior to implantation into a patient. In the case of a plasticized graft, the plasticizer may optionally be not replaced by water or may optionally be partially or fully replaced by water.
  • [0051]
    Soft tissue grafts. By the term “soft tissue grafts” is intended for the purposes of the present invention, load-bearing and non-load-bearing soft tissue products. Non load-bearing grafts include cadaveric skin. Load-bearing soft tissue grafts include for example: pericardium, dura mater, fascia lata, and a variety of ligaments and tendons. Soft tissue grafts are composed of an internal matrix which includes collagen, elastin and high molecular weight solutes where during cleaning cellular elements and small molecular weight solutes are removed.
  • [0052]
    II. Plasticizers
  • [0053]
    Plasticization of load-bearing bone or soft tissue grafts represents a method of replacing free and loosely bound waters of hydration in the tissue(s) with a plasticizer composition containing one or more plasticizers, without altering the orientation of the collagen fibers and associated mineral phase. Suitable plasticizers include compounds which are soluble in water and can easily displace/replace water at the molecular level. Suitable plasticizers preferably have a low molecular weight such that the plasticizer fits into the spaces available to water within the hydrated molecular structure of the bone or soft tissue. Such plasticizers are not toxic to the cellular elements of tissue into which the graft is to be placed, or alternatively, the plasticizer is easily removed from the graft product prior to implantation. Finally, the plasticizer is preferably compatible with and preferably readily associates with the molecular elements of the bone or soft tissue.
  • [0054]
    Plasticizers suitable for use in the present invention include for example, a variety of biocompatible aqueous solutions. Examples of acceptable plasticizers include, but are not restricted to, members of the polyol family (sugar alcohols) of compounds including C2 to C7 polyols, monoglycerides (such as monoolein and monolinolein), and various short- and medium-chain free fatty acids (such short-chain free fatty acids preferably having a carbon chain length of less than six {circle over (C)}6), and such medium-chain free fatty acids preferably having a carbon chain length of from C12 to C14) and their corresponding monoacylglycerol esters (MGs) such as the saturated MGs, ranging in carbon chain length from C5 to C16, and preferably C5 to C14 MGs. Specific plasticizers include, but are not limited to, glycerol (glycerin USP), adonitol, sorbitol, ribitol, galactitol, D-galactose, 1,3-dihydroxypropanol, ethylene glycol, triethylene glycol, propylene glycol, glucose, sucrose, mannitol, xylitol, meso-erythritol, adipic acid, pro line, hydroxyproline or similar water-soluble small molecular weight solutes which can be expected to replace water in the base matrix structure of bone or soft tissue, and provide the hydrating functions of water in that tissue. Other plasticizers suitable for use in the present invention can be readily selected and employed by one of ordinary skill in the art to which the present invention pertains without undue experimentation depending on the desired clinical outcome, sensitivity of the implantation procedure, patient sensitivities, and physician choice.
  • [0055]
    The present plasticizers are preferably employed at a concentration in the range of from 0.1 to 2.0 M, 10% to 100% by weight/volume, or 3% to 30% by weight of bone or soft tissue. The use of Molar concentrations and weight/volume percentages to express preferred concentration ranges are intended to deal with the concentrations of these plasticizers in the solutions used to treat the tissues. The use of the weight percent of plasticizer in load-bearing bone or soft tissue is intended to deal with the effective quantity of a given plasticizer in the load-bearing tissue which is necessary to effectively replace the waters of hydration present in the unprocessed tissues which are maximally plasticized to a state approximating normal tissue. The plasticizer can be introduced into the bone or soft tissue matrix at any number of steps in the processing procedures and at a variety of concentrations with and without the use of permeation enhancers.
  • [0056]
    The result(s) of plasticization of load-bearing bone and soft tissue products are bone or soft tissue products which are similar to traditionally dehydrated bone and soft tissue products in residual moisture but are not subject to fractures or micro fractures like such dehydrated products, yet do not need to be rehydrated prior to use. The mechanical and use properties of a plasticized bone or soft tissue product are similar to those of natural (fresh autogenous and/or fresh-frozen allograft) bone, dura, pericardium, fascia, ligaments, and tendons.
  • [0057]
    III. Graft Cleaning and Processing
  • [0058]
    The present plasticizers may be introduced to the bone or soft tissue products at several points in the processing procedure(s). Bone processing and cleaning procedures suitable for use with the present invention include known processes, as well as the processes described in U.S. Pat. No. 5,556,379 and co-pending U.S. patent application Ser. Nos: 08/871,601 “Process for Cleaning Grafts Using Centrifugal Force and Bone Grafts Produced Thereby”; 08/620,858 “Composition for Cleaning Bones”; 08/646,520 “Recirculation Method for Cleaning Essentially Intact Bone Grafts Using Pressure Mediated Flow of Solutions and Bone Grafts Produced Thereby”; and 08/646,519 “Ultrasonic Cleaning of Allograft Bone” which are hereby incorporated herein in their entirety. The plasticizers may be incorporated into the processing procedure(s) using steps where the plasticizer(s) is/are present at essentially fill strength, i.e. 100% concentration, in the presence and/or absence of permeation enhancers, and at concentrations less than fill strength.
  • [0059]
    Bone tissue is cleaned and processed as described in U.S. Pat. No. 5,556,379, and co-pending U.S. patent application Ser. Nos. 08/871,601; 08/620,858; 08/646,520; and 08/646,519 by for example, transection of an essentially intact bone or perforation of an essentially intact bone with attachment of sterile plastic tubing to the cut end of a transected bone or to an attachment port inserted into the perforation of the perforated bone. The bone is immersed in a cleaning solution, such solutions including known cleaning agents as well as those described in the above-identified patent and co-pending patent applications, with or without use of sonication. The cleaning solution is induced to flow into, through, and out of the bone through use of a peristaltic pump or negative pressure applied to the cleaning solution. The induced flow of cleaning solution draws the bone marrow from the interior of the bone, and particularly from the cancellous bone marrow space, where it can be safely deposited in a receiving container containing a strong virucidal agent such as sodium hypochlorite (common bleach). The cleaned bone can then be further cleaned by causing the cleaning solution to be replaced with a solution of one or more decontaminating agents, including for example 3% hydrogen peroxide, with or without plasticizer. Hydrogen peroxide which in addition to its mild disinfection activity generates oxygen bubbles that can further assist in dislodging residual bone marrow materials causing the residual bone marrow materials to flow from the bone and into the receiving container.
  • [0060]
    In the above-described process, after processing with the cleaning solution, after processing with a decontaminating agent, in place of processing with a decontaminating agent, or after dehydration, the cleaned graft is plasticized for example, by processing the cleaned graft with a plasticizer composition containing one or more plasticizers including for example glycerin USP in a solvent.
  • [0061]
    IV. Plasticization
  • [0062]
    Bone and soft tissue grafts can be cleaned and processed using conventional methods, including those described in. When processing using these methods the graft is plasticized by adding one or more plasticizers or a plasticizer composition to processing steps after bone cleaning is essentially completed, and prior to freeze-drying. Under freeze-drying, the water present in the bone (or smaller cut bone grafts produced form the essentially intact bone) is removed by sublimation, however, the glycerol will remain and replace the free and bound water as the water is removed from the bone tissue. The one or more plasticizer(s) is added to fully hydrated bone tissue and the plasticizer(s) are induced to penetrate into the bone tissue optionally using a permeation enhancer. Thus, the bone or soft tissue is dehydrated yet the materials properties of the bone tissue will be similar to the materials properties of normal bone or soft tissue, i.e. partially or fully hydrated bone or soft tissue. The produced plasticized bone or soft graft contains minimal quantities of the plasticizer(s) and can be removed from the package and directly implanted into a patient without rehydration. If the presence of these small quantities of glycerol is of concern, the bone or soft tissue grafts may be quickly rinsed and/or washed in sterile saline just prior to implantation.
  • [0063]
    Bone or soft tissue cleaned and processed by the methods as described for bone cleaning and processing in U.S. Pat. No. 5,556,379, and/or co-pending U.S. patent application Ser. Nos. 08/871,601; 08/620,858; 08/646,520; and/or 08/646,519 and/or bone or soft tissue cleaned and processed by conventional methods, may be plasticized by processing with the plasticizer composition containing one or more plasticizers, including for example glycerin USP, in a solvent by for example drawing the plasticizer composition into the bone. Suitable solvents include for example, 70% isopropyl alcohol. The 70% isopropyl alcohol/plasticizer composition can be prepared by diluting absolute (100%) isopropyl alcohol with the one or more plasticizers, including for example glycerin USP such that the plasticizer accounts for 30% of the total volume and isopropyl alcohol accounts for 70% of the total volume. Under this method, the original processing procedures as described in U.S. Pat. No. 5,556,379 regarding the use of 70% isopropyl alcohol, is retained essentially unchanged. The isopropyl alcohol facilitates penetration of the glycerol into the tissue by acting as a permeation enhancer and the glycerol more readily penetrates the tissue due to the reduced surface tension of the alcoholic solution. The induced flow of glycerof/isopropyl alcohol into, through, and out of for example, the essentially intact bone, further serves to remove residual cellular elements, for example bone marrow materials, if any. It also allows penetration of the glycerol/isopropyl alcohol solution into the most remote areas of the tissue, and facilitates a uniform distribution of the glycerol into the tissue. The isopropyl alcohol can be removed from the tissue by washing with a washing solution including sterile water, for example as described in U.S. Pat. No. 5,556,379 following the alcohol processing step. Preferably, the washing solution includes glycerin USP (30% volume:volume). The washing solution facilitates removal of the isopropyl alcohol without removal of the glycerin USP. The cleaned and plasticized tissue can then be frozen and freeze-dried or dehydrated according to standard protocols.
  • [0064]
    Alternatively, bone or soft tissue grafts may be plasticized after cleaning and freeze-drying. For example, tissue can be processed and cleaned according to any method including known methods, or as described in U.S. Pat. No. 5,556,379 described above. After the sterile water wash the tissue (for example bone tissue) is cleaned of virtually all cellular elements (for example, bone marrow) present in the tissue and the cleaned tissue can be further processed into for example, small cut bone grafts, and dehydrated or freeze-dried (also called lyophilized) using standard methods well known to those skilled in the art. Freeze-dried or dehydrated tissue grafts preferably contain less than about 5% residual moisture, satisfying the definition of freeze-dried bone allografts as prescribed under Standards of the American Association of Tissue Banks.
  • [0065]
    Clean freeze-dried or dehydrated bone or soft tissue grafts are plasticized by processing the tissue graft with a plasticizer composition, suitable compositions including for example 70% isopropyl alcohol/30% glycerin USP or 100% glycerin USP. Due to the presence of air in the cancellous and cortical bone spaces, the plasticizer(s) may only penetrate into the bone tissue with which it is in physical contact. Suitable methods for achieving physical contact between the plasticizer and bone or soft tissue include those methods known to one of ordinary skill in the art to which the present invention pertains. The plasticizer composition can be induced to flow into the cancellous and cortical bone spaces of bone tissue, or soft tissue, thus achieving physical contact, by various known methods that can be readily selected and employed by one of ordinary skill in the art to which the present invention pertains without undue experimentation, and include for example, agitation of the a tissue with the plasticizer composition, application of a vacuum (5 to 500 mTorr) above the plasticizer. The vacuum induces the air trapped in the, for example cancellous and cortical bone spaces/tissue to exit and be carried off. As the trapped air is removed from the cancellous and cortical bone spaces/tissue, the plasticizer quickly moves into the spaces previously occupied by air greatly enhancing penetration of the plasticizer into the bone or soft tissue. The plasticizer fills the spaces previously occupied by the free and bound water restoring the tissue to a materials property similar to that materials property of the original fully or partially hydrated tissue (e.g. normal bone).
  • [0066]
    The present one or more plasticizers may be introduced to soft tissue products at several points in the processing procedures, but are preferably introduced prior to the freeze-drying or dehydrating step. By introducing plasticizers prior to freeze-drying or dehydrating, the derived soft tissue graft is in a freeze-dried/dehydrated state where the plasticizer is used to stabilize the matrix and load bearing components of the soft tissue graft such that the graft can be used without rehydration/reconstitution.
  • [0067]
    V. Transplantation Into a Patient
  • [0068]
    Prior to transplantation into a patient, excess glycerol may optionally be removed from the plasticized bone or soft tissue graft using for example, the method described in co-pending U.S. patent application Ser. No. 08/871,601. Specifically, the plasticized grafts are placed into centrifuge vessels/containers and on top of inserts designed to keep the bone grafts off of the bottom of the containers. The grafts are then centrifuged at 1,000 to 2,000 revolutions per minute (rpm) for 10-20 minutes. The excess glycerol or similar plasticizer exits the grafts and collects in the bottom of the centrifuge containers away from the grafts. The plasticizer tightly associated with the molecular and chemical structure of the tissue will not exit the graft and the tissue will remain plasticized without retaining physically discernable quantities of plasticizer. The plasticized graft(s) may then be packaged directly or packaged in a packaging format which permits application of a vacuum to the container. The current value of using a packaging format which permits storage of grafts under vacuum lies in the ability to predict possible loss of sterility with loss of vacuum to the packaging.
  • [0069]
    Clinical usage of plasticized bone or soft tissue grafts includes direct implantation of the grafts without further processing following removal from the packaging, implantation following a brief washing in sterile isotonic saline to remove any remaining traces of plasticizer associated with the immediate surfaces of the grafts, or by implantation following an extended (approximately 1 hour) washing with sterile isotonic saline to remove as much plasticizer as possible. Under any of the above described further processing of grafts, the materials properties of the plasticized grafts resemble those materials properties of fully or partially hydrated natural tissue (i.e. normal bone or soft tissue). The produced plasticized graft does not need to be rehydrated prior to clinical implantation, yet retains the strength and compressive/tensile properties of natural tissue. Plasticized freeze-dried soft tissue grafts where the plasticizer is used to stabilize the matrix and load bearing components of the soft tissue graft, can also be directly implanted in a patient without rehydration/reconstitution.
  • [0070]
    Suitable surgical methods for implanting bone and soft tissue grafts into a patient are well known to those of ordinary skill in the art to which the present invention pertains, and such methods are equally applicable to implantation of the present plasticized grafts. Those of ordinary skill in the art to which the present invention pertains can readily determine, select and employ suitable surgical methods without undue experimentation.
  • [0071]
    Further details of the process of the invention are presented in the examples that follow:
  • EXAMPLE 1 Processing of a Frozen Distal Femur
  • [0072]
    A. Cleaning and Processing: A frozen distal femur is selected and all of the soft tissue and periosteum is removed using sharp dissection techniques and periosteal elevators. The graft is then transected to the desired length using a Stryker® saw or band saw. Each bisected piece is not more than 30 cm in length and is straight and contains no bone fragments. The surface cartilage is then removed from the femoral condyle with either a scalpel blade, periosteal elevator, or osteotome. The processing instructions dictate leaving the cartilage “on” when appropriate. Using a ⅜″ drill bit, the cut end of the shaft is drilled approximately 5 cm. The interior of the intramedullary canal is then throughly washed with the lavage system.
  • [0073]
    An intercalary fitting is then inserted by screwing the threaded, tapered end into the cut end of the graft. The vacuum tubing is assembled by securing one end of the tubing to the nipple end of the intercalary fitting. The other end of the tubing is secured to the piston driven pump. Finally, another section of vacuum tubing is secured to the other side of the piston pump. Approximately 4000 cc of a 1:100 dilution of the “Allowash™ Solution” is poured into the sterile flushing vessel. The “Allowash™ Solution” is prepared by adding 4 cc of cleaning reagent to 3996 cc of sterile water. The flushing vessel is labeled as “Allowash™ Solution.” The open end of the second piece of vacuum tubing is placed into a graduated flask. The piston pump is set to “reverse” and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of the first solvent (Allowash™ Solution) is drawn to waste. Thereafter, the open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the “reverse” position at 50%. The Allowash Solution recirculates for a minimum of 15 minutes.
  • [0074]
    The 1:100 dilution of the Allowash™ Solution is then decanted and approximately 4 liters of 3% hydrogen peroxide is added to the flushing vessel. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is then turned on and at least 500 cc of the 3% hydrogen peroxide solution is drawn to waste. Thereafter, the open end of the second piece of vacuum tubing is removed from the graduated flask and placed it into the sterile flushing vessel. The drive is maintained in the reverse position at 50%. The hydrogen peroxide is then allowed to recirculate for a minimum of 15 minutes.
  • [0075]
    The hydrogen peroxide is then decanted and approximately 3980 cc of sterile water is added along with the entire contents of reconstituted vials of Bacitracin and Polymyxin B to the flushing vessel. The flushing vessel is clearly labeled “antibiotic.” The piston pump is then set to reverse and the flow rate controller is set at 50%. The pump is turned on and at least 500 cc of antibiotic solution is drawn to waste. The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position at 50%. The antibiotic solution is allowed to recirculate for a minimum of 15 minutes.
  • [0076]
    B. Plasticization: The antibiotic solution is then decanted and approximately 4 liters of 70% isopropyl alcohol/30% glycerin USP is added to the flushing vessel. The flushing vessel is clearly labeled as 70% IPA/30% glycerin USP. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of IPA/glycerin USP solution is drawn to waste.
  • [0077]
    The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position and the flow controller is set to 50%. The IPA/glycerin USP is allowed to recirculate for a minimum of 30 minutes. The IPA/glycerin USP solution is decanted and 4 liters of 30% glycerin USP in sterile water is added to the flushing vessel. The flushing vessel is labeled as glycerin USP washing solution. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of washing solution is drawn to waste.
  • [0078]
    The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position and the flow rate controller is set to 50%. The washing solution is allowed to recirculate for a minimum of 15 minutes. Thereafter, the bone graft is removed from the flushing vessel and processed for freeze-drying as per standard operating procedure.
  • EXAMPLE 2
  • [0079]
    Processing of a Frozen Distal Femur
  • [0080]
    A. Cleaning and Processing: A frozen distal femur is selected and all of the soft tissue and periosteum is removed using sharp dissection techniques and periosteal elevators. The graft is then transected to the desired length using a Stryker® saw or band saw. Each bisected piece is not more than 30 cm in length and is straight and contains no bone fragments. The surface cartilage is then removed from the femoral condyle with either a scalpel blade, periosteal elevator, or osteotome. The processing instructions dictate leaving the cartilage “on” when appropriate. Using a ⅜″ drill bit, the cut end of the shaft is drilled approximately 5 cm. The interior of the intramedullary canal is then throughly washed with the lavage system.
  • [0081]
    An intercalary fitting is then inserted by screwing the threaded, tapered end into the cut end of the graft. The vacuum tubing is assembled by securing one end of the tubing to the nipple end of the intercalary fitting. The other end of the tubing is secured to the piston driven pump. Finally, another section of vacuum tubing is secured to the other side of the piston pump. Approximately 4000 cc of a 1:100 dilution of the “Allowash™ Solution” is poured into the sterile flushing vessel. The “Allowash™ Solution” is prepared by adding 4 cc of cleaning reagent The flushing vessel is labeled as “Allowash™ Solution.” The open end of the second piece of vacuum tubing is placed into a graduated flask. The piston pump is set to “reverse” and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of the first solvent (Allowash Solution) is drawn to waste. Thereafter, the open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the “reverse” position at 50%. The Allowash Solution recirculates for a minimum of 15 minutes.
  • [0082]
    B. Plasticization: The 1:100 dilution of the Allowash™ Solution is decanted and approximately 4 liters of 3% hydrogen peroxide/30% glycerin USP is added to the flushing vessel. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of the 3% hydrogen peroxide/glycerin USP solution is drawn to waste. The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position. The hydrogen peroxide/glycerin USP is allowed to recirculate for a minimum of 15 minutes.
  • [0083]
    The hydrogen peroxide/glycerin USP is then decanted and approximately 3980 cc of sterile water is added along with the entire contents of reconstituted vials of Bacitracin and Polymyxin B prepared in a water solution of 30% glycerin USP, to the flushing vessel. The flushing vessel is clearly labeled “antibiotic.” The piston pump is then set to reverse and the flow rate controller is set at 50%. The pump is turned on and at least 500 cc of antibiotic solution is drawn to waste. The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position at 50%. The antibiotic solution is allowed to recirculate for a minimum of 15 minutes.
  • [0084]
    The antibiotic solution is then decanted and approximately 4 liters of 70% isopropyl alcohol/30% glycerin USP is added to the flushing vessel. The flushing vessel is clearly labeled as 70% IPA/30% glycerin USP. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of IPA/glycerin USP solution is drawn to waste.
  • [0085]
    The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position and the flow controller is set to 50%. The IPA/glycerin USP is allowed to recirculate for a minimum of 30 minutes. The IPA/glycerin USP solution is decanted and 4 liters of 30% glycerin USP in sterile water is added to the flushing vessel. The flushing vessel is labeled as glycerin USP washing solution. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of washing solution is drawn to waste.
  • [0086]
    The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position and the flow rate controller is set to 50%. The washing solution is allowed to recirculate for a minimum of 15 minutes. Thereafter, the bone graft is removed from the flushing vessel and processed for freeze-drying as per standard operating procedure.
  • EXAMPLE 3 Processing of a Frozen Distal Femur
  • [0087]
    A. Cleaning and Processing: A frozen distal femur is selected and all of the soft tissue and periosteum is removed using sharp dissection techniques and periosteal elevators. The graft is then transected to the desired length using a Stryker® saw or band saw. Each bisected piece is not more than 30 cm in length and is straight and contains no bone fragments. The surface cartilage is then removed from the femoral condyle with either a scalpel blade, periosteal elevator, or osteotome. The processing instructions dictate leaving the cartilage “on” when appropriate. Using a ⅜″ drill bit, the cut end of the shaft is drilled approximately 5 cm. The interior of the intramedullary canal is then throughly washed with the lavage system.
  • [0088]
    An intercalary fitting is then inserted by screwing the threaded, tapered end into the cut end of the graft. The vacuum tubing is assembled by securing one end of the tubing to the nipple end of the intercalary fitting. The other end of the tubing is secured to the piston driven pump. Finally, another section of vacuum tubing is secured to the other side of the piston pump. Approximately 4000 cc of a 1:100 dilution of the “Allowash™ Solution” is poured into the sterile flushing vessel. The “Allowash™ Solution” is prepared by adding 4 cc of cleaning reagent. The flushing vessel is labeled as “Allowash™ Solution.” The open end of the second piece of vacuum tubing is placed into a graduated flask. The piston pump is set to “reverse” and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of the first solvent (Allowash Solution) is drawn to waste. Thereafter, the open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the “reverse” position at 50%. The Allowash Solution recirculates for a minimum of 15 minutes.
  • [0089]
    The 1:100 dilution of the Allowash™ Solution is then decanted and approximately 4 liters of 3% hydrogen peroxide is added to the flushing vessel. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is then turned on and at least 500 cc of the 3% hydrogen peroxide solution is drawn to waste. Thereafter, the open end of the second piece of vacuum tubing is removed from the graduated flask and placed it into the sterile flushing vessel. The drive is maintained in the reverse position at 50%. The hydrogen peroxide is then allowed to recirculate for a minimum of 15 minutes.
  • [0090]
    The hydrogen peroxide is then decanted and approximately 3980 cc of sterile water is added along with the entire contents of reconstituted vials of Bacitracin and Polymyxin B to the flushing vessel. The flushing vessel is clearly labeled “antibiotic.” The piston pump is then set to reverse and the flow rate controller is set at 50%. The pump is turned on and at least 500 cc of antibiotic solution is drawn to waste. The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position at 50%. The antibiotic solution is allowed to recirculate for a minimum of 15 minutes.
  • [0091]
    The antibiotic solution is then decanted and approximately 4 liters of 70% isopropyl alcohol (IPA) is added to the flushing vessel. The flushing vessel is labeled as 70% IPA. The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of IPA solution is drawn to waste. The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position and the flow controller is set to 50%. The IPA recirculates for a minimum of 15 minutes. The IPA solution is then decanted and 4 liters of sterile water is added to the flushing vessel. The flushing vessel is labeled as “washing solution.” The piston pump is set to reverse and the flow rate controller is set to 50%. The pump is turned on and at least 500 cc of washing solution is drawn to waste.
  • [0092]
    The open end of the second piece of vacuum tubing is removed from the graduated flask and placed into the sterile flushing vessel. The drive is maintained in the reverse position and the flow rate controller is set to 50%. The washing solution recirculates for a minimum of 15 minutes. The bone graft is removed from the flushing vessel and processed for freeze-drying as per standard operating procedure.
  • [0093]
    B. Plasticization: The freeze-dried bone graft(s) are then placed into sterile glycerin USP such that they are totally immersed in the viscous glycerol. Vacuum (10 to 500 mTorr, preferably 100 to 200 mTorr) is applied to the container until bubbles cease to exit the bone graft (about 5 to 60 minutes depending on the size and configuration of the bone graft, preferably about 20 to 30 minutes). The bone graft(s) are then removed from the glycerin USP solution and placed into an appropriate centrifuge container on top of a graft support.
  • [0094]
    The bone graft(s) are centrifuged at about 1000 to 2000 rpm until the glycerol ceases to exit the bone graft and accumulate in the bottom of the centrifuge container (usually 5 to 60 minutes depending on the size and configuration of the bone graft, preferably about 5 to 15 minutes). The bone graft(s) are then removed from their respective centrifuge containers and packaged for distribution.
  • EXAMPLE 4 Processing Cloward Dowels
  • [0095]
    A. Cleaning and Processing: Graft material is selected and all of the soft tissue and periosteum is removed from the distal femur, proximal and distal tibia, and cartilage is removed from the site. The femur is transected 10-15 cm above the femoral condyles and the distal femoral condyles are bisected. Transect the proximal tibia 10-15 cm below the tibial plateau. The distal femur or proximal tibia is placed in a Pan-A-Vise™. This is accomplished by removing a section of the diaphysis, allowing the vise jaws to grip the tissue securely. The Cloward set (12, 14, 16, 18, or 20 mm) is then assembled: 1. Place the extractor assembly within the cutter shaft, 2. Screw the cutter assembly onto the shaft with the aid of the Cloward set wrench, 3. Screw the set-point onto the extractor assembly, 4. Insert the shaft of the Cloward set into the ⅜″ variable speed drill and tighten the chuck with the key. The set-point is then placed and locked at the forward aspect of the cutter.
  • [0096]
    The apparatus is then placed on the tissue to be fashioned. Drilling is commenced at a moderate speed. After the set-point has made a deep cut in the tissue, and the teeth have begun to cut into the tissue, drilling is stopped, and the set-point apparatus is unlocked. Drilling is continued using the marks created as a guide.
  • [0097]
    The Cloward(s) are then removed from the tissue block. A Stryker® saw or band saw is then used to remove the cut grafts after all have been cut. Any cartilage is then trimmed from the cortical face of the Cloward(s) using a scalpel and a #10 blade. The distal end of the graft is then trimmed perpendicular to the body of the graft with a band saw making sure the fashioned graft is at least 15 mm long. The Cloward(s) are cleansed using pulsatile water apparatus. If the surface marrow is not easily removed, dry spin the graft(s) at 2600 rpm for 3 minutes.
  • [0098]
    The Cloward(s) are then placed in a sterile container with hydrogen peroxide (3%) at 37 to 44° C. The container is sealed and the container is placed into the centrifuge. The centrifuge is then balanced. The grafts are then centrifuged at 2600 rpm for 15 minutes. The tissue is removed from the centrifuge and the rafts are placed into an ultrasonic cleaner. Equal volumes of Allowash™ Solution, hydrogen peroxide (3%), and antibiotics are added to the ultrasonic cleaner and sonicate the tissue at 37-44° C. for a minimum of 1 hour. Thereafter, the tissue is removed from the ultrasonic cleaner.
  • [0099]
    The mixture is decanted and a sterile glass container is filled with fresh 3% hydrogen peroxide. The grafts are then placed in the container, the top is sealed and the container is taken to the large ultrasonic cleaner. The grafts are then sonicated for 90 minutes. Thereafter, the grafts are incubated overnight at 37-44° C. (minimum of 6 hours, preferably 12 to 18 hours).
  • [0100]
    B. Plasticization: After incubation, the hydrogen peroxide is decanted and the basin is filled with 70% isopropyl alcohol/30% glycerin USP and the grafts are incubated at room temperature for a minimum of 30 minutes. Thereafter, the isopropyl alcohol/glycerin USP solution is decanted and the container is filled with warm 30% glycerin USP in water. The grafts are incubated for a minimum of 30 minutes. Methods of incubation include for example: soaking.
  • [0101]
    The glycerin solution is then decanted and the Cloward dowels are removed from the container. The Cloward dowels are then placed into a sterile container. The container is sealed and placed into the centrifuge. The centrifuge is balanced and the grafts are centrifuged for 3-5 minutes to dry, and the remaining solution is removed.
  • [0102]
    The width and length of the Cloward(s) are measured, raft identification numbers are assigned, and the information is recorded on the “Tissue Processing Log Worksheet”. One graft is then placed into a glass, 120 cc bottle and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The bottled grafts are either frozen and packaged, or frozen and freeze-dried and packaged.
  • EXAMPLE 5 Processing Cloward Dowels
  • [0103]
    A. Cleaning and Processing: Graft material is selected and all of the soft tissue and periosteum is removed from the distal femur, proximal and distal tibia, and cartilage is removed from the site. The femur is transected 10-15 cm above the femoral condyles and the distal femoral condyles are bisected. Transect the proximal tibia 10-15 cm below the tibial plateau. The distal femur or proximal tibia is placed in a Pan-A-Vise™. This is accomplished by removing a section of the diaphysis, allowing the vise jaws to grip the tissue securely. The Cloward set (12, 14, 16, 18, or 20 mm) is then assembled: 1. Place the extractor assembly within the cutter shaft, 2. Screw the cutter assembly onto the shaft with the aid of the Cloward set wrench, 3. Screw the set-point onto the extractor assembly, 4. Insert the shaft of the Cloward set into the ⅜″ variable speed drill and tighten the chuck with the key. The set-point is then placed and locked at the forward aspect of the cutter.
  • [0104]
    The apparatus is then placed on the tissue to be fashioned. Drilling is commenced at a moderate speed. After the set-point has made a deep cut in the tissue, and the teeth have begun to cut into the tissue, drilling is stopped, and the set-point apparatus is unlocked. Drilling is continued using the marks created as a guide.
  • [0105]
    The Cloward(s) are then removed from the tissue block. A Stryker® saw or band saw is then used to remove the cut grafts after all have been cut. Any cartilage is then trimmed from the cortical face of the Cloward(s) using a scalpel and a #10 blade. The distal end of the graft is then trimmed perpendicular to the body of the graft with a band saw making sure the fashioned graft is at least 15 mm long. The Cloward(s) are cleansed using pulsatile water apparatus. If the surface marrow is not easily removed, dry spin the graft(s) at 2600 rpm for 3 minutes.
  • [0106]
    B. Plasticization: The Cloward(s) are then placed in a sterile container with hydrogen peroxide (3%) and glycerin USP (30%) at 37 to 44° C. The container is sealed and the container is placed into the centrifuge. The centrifuge is then balanced. The grafts are then centrifuged at 2600 rpm for 15 minutes. The tissue is removed from the centrifuge and the grafts are placed into an ultrasonic cleaner. Equal volumes of Allowash™ Solution, hydrogen peroxide (3%), 30% glycerin USP, and antibiotics are added to the ultrasonic cleaner and the tissue is sonicated at 37-44° C. for a minimum of 1 hour. Thereafter, the tissue is removed from the ultrasonic cleaner.
  • [0107]
    The mixture is decanted and a sterile glass container is filled with fresh 3% hydrogen peroxide/30% glycerin USP. The grafts are then placed in the container, the top is sealed and the container is taken to the large ultrasonic cleaner. The grafts are then sonicated for 90 minutes.
  • [0108]
    Thereafter, the grafts are incubated overnight at 37-44° C. (minimum of 6 hours, preferably 12 to 18 hours).
  • [0109]
    After incubation, the hydrogen peroxide is decanted and the basin is filled with 70% isopropyl alcohol/30% glycerin USP and the grafts are incubated at room temperature for a minimum of 30 minutes. Thereafter, the isopropyl alcohol/glycerin USP solution is decanted and the container is filled with warm 30% glycerin USP in water. The grafts are incubated for a minimum of 30 minutes. Methods of incubation include for example: soaking and mild agitation.
  • [0110]
    The glycerin solution is then decanted and the Cloward dowels are removed from the container. The Cloward dowels are then placed into a sterile container. The container is sealed and placed into the centrifuge. The centrifuge is balanced and the grafts are centrifuged for 3-5 minutes to dry, and the remaining solution is removed.
  • [0111]
    The width and length of the Cloward(s) are measured, graft identification numbers are assigned, and the information is recorded on the “Tissue Processing Log Worksheet”. One graft is then placed into a glass, 120 cc bottle and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The bottled grafts are either frozen and packaged, or frozen and freeze-dried and packaged.
  • EXAMPLE 6 Processing Cloward Dowels
  • [0112]
    A. Cleaning and Processing: Graft material is selected and all of the soft tissue and periosteum is removed from the distal femur, proximal and distal tibia, and cartilage is removed from the site. The femur is transected 10-15 cm above the femoral condyles and the distal femoral condyles are bisected. Transect the proximal tibia 10-15 cm below the tibial plateau. The distal femur or proximal tibia is placed in a Pan-A-Vise™. This is accomplished by removing a section of the diaphysis, allowing the vise jaws to grip the tissue securely. The Cloward set (12, 14, 16, 18, or 20 mm) is then assembled: 1. Place the extractor assembly within the cutter shaft, 2. Screw the cutter assembly onto the shaft with the aid of the Cloward set wrench, 3. Screw the set-point onto the extractor assembly, 4. Insert the shaft of the Cloward set into the ⅜″ variable speed drill and tighten the chuck with the key. The set-point is then placed and locked at the forward aspect of the cutter.
  • [0113]
    The apparatus is then placed on the tissue to be fashioned. Drilling is commenced at a moderate speed. After the set-point has made a deep cut in the tissue, and the teeth have begun to cut into the tissue, drilling is stopped, and the set-point apparatus is unlocked. Drilling is continued using the marks created as a guide.
  • [0114]
    The Cloward(s) are then removed from the tissue block. A Stryker® saw or band saw is then used to remove the cut grafts after all have been cut. Any cartilage is then trimmed from the cortical face of the Cloward(s) using a scalpel and a #10 blade. The distal end of the graft is then trimmed perpendicular to the body of the graft with a band saw making sure the fashioned graft is at least 15 mm long. The Cloward(s) are cleansed using pulsatile water apparatus. If the surface marrow is not easily removed, dry spin the graft(s) at 2600 rpm for 3 minutes.
  • [0115]
    The Cloward(s) are then placed in a sterile container with hydrogen peroxide (3%) at 37 to 44° C. The container is sealed and the container is placed into the centrifuge. The centrifuge is then balanced. The grafts are then centrifuged at 2600 rpm for 15 minutes. The tissue is removed from the centrifuge and the grafts are placed into an ultrasonic cleaner. Equal volumes of Allowash™ Solution, hydrogen peroxide (3%), and antibiotics are added to the ultrasonic cleaner and sonicate the tissue at 37-44° C. for a minimum of 1 hour. Thereafter, the tissue is removed from the ultrasonic cleaner.
  • [0116]
    The mixture is decanted and a sterile glass container is filled with fresh 3% hydrogen peroxide. The grafts are then placed in the container, the top is sealed and the container is taken to the large ultrasonic cleaner. The grafts are then sonicated for 90 minutes. Thereafter, the grafts are incubated overnight at 37-44° C. (minimum of 6 hours, preferably 12 to 18 hours).
  • [0117]
    After incubation, the hydrogen peroxide is decanted and the basin is filled with 70% isopropyl alcohol and the grafts are incubated at room temperature for a minimum of 30 minutes. Thereafter, the isopropyl alcohol is decanted and the container is filled with warm sterile water. The grafts are incubated for a minimum of 30 minutes. Methods of incubation include for example: soaking and mild agitation.
  • [0118]
    The wash solution is then decanted and the Cloward dowels are removed from the container. The Cloward dowels are then placed into a sterile container. The container is sealed and placed into the centrifuge. The centrifuge is balanced. The grafts are then centrifuged for 3-5 minutes to dry and the remaining solution is removed.
  • [0119]
    The width and length of the Cloward(s) are measured, graft identification numbers are assigned, and the information is recorded on the “Tissue Processing Log Worksheet”. One graft is then placed into a glass, 120 cc bottle and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The bottled grafts are either frozen and packaged, or frozen and freeze-dried and packaged.
  • [0120]
    B. Plasticization: Viscous glycerol is then added to each bottle sufficient to cover the graft and vacuum (10 to 500 mTorr) is applied to each bottle until the air ceases to exit the grafts (usually 5-20 minutes depending on graft type). The grafts are then removed from the bottles and placed into a centrifuge container. The grafts are centrifuged for 15-30 minutes or until glycerol ceases to exit the grafts and accumulate in the space below the grafts. The bottled grafts are either packaged or placed under vacuum and packaged.
  • EXAMPLE 7 Processing Cloward Dowels
  • [0121]
    A. Cleaning and Processing: Graft material is selected and all of the soft tissue and periosteum is removed from the distal femur, proximal and distal tibia, and cartilage is removed from the site. The femur is transected 10-15 cm above the femoral condyles and the distal femoral condyles are bisected. Transect the proximal tibia 10-15 cm below the tibial plateau. The distal femur or proximal tibia is placed in a Pan-A-Vise™. This is accomplished by removing a section of the diaphysis, allowing the vise jaws to grip the tissue securely. The Cloward set (12, 14, 16, 18, or 20 mm) is then assembled: 1. Place the extractor assembly within the cutter shaft, 2. Screw the cutter assembly onto the shaft with the aid of the Cloward set wrench, 3. Screw the set-point onto the extractor assembly, 4. Insert the shaft of the Cloward set into the ⅜″ variable speed drill and tighten the chuck with the key. The set-point is then placed and locked at the forward aspect of the cutter.
  • [0122]
    The apparatus is then placed on the tissue to be fashioned. Drilling is commenced at a moderate speed. After the set-point has made a deep cut in the tissue, and the teeth have begun to cut into the tissue, drilling is stopped, and the set-point apparatus is unlocked. Drilling is continued using the marks created as a guide.
  • [0123]
    The Cloward(s) are then removed from the tissue block. A Stryker® saw or band saw is then used to remove the cut grafts after all have been cut. Any cartilage is then trimmed from the cortical face of the Cloward(s) using a scalpel and a #10 blade. The distal end of the graft is then trimmed perpendicular to the body of the graft with a band saw making sure the fashioned graft is at least 15 mm long. The Cloward(s) are cleansed using pulsatile water apparatus. If the surface marrow is not easily removed, dry spin the graft(s) at 2600 rpm for 3 minutes.
  • [0124]
    B. Plasticization: The Cloward(s) are then placed in a sterile container with hydrogen peroxide (3%)/glycerin USP 30% at 37 to 44° C. The container is sealed and the container is placed into the centrifuge. The centrifuge is then balanced. The grafts are then centrifuged at 2600 rpm for 15 minutes. The tissue is removed from the centrifuge and the grafts are placed into an ultrasonic cleaner. Equal volumes of Allowash™ Solution, hydrogen peroxide (3%), and antibiotics are added to the ultrasonic cleaner and sonicate the tissue at 37-44° C. for a minimum of 1 hour. Thereafter, the tissue is removed from the ultrasonic cleaner.
  • [0125]
    The mixture is decanted and a sterile glass container is filled with fresh 3% hydrogen peroxide. The grafts are then placed in the container, the top is sealed and the container is taken to the large ultrasonic cleaner. The grafts are then sonicated for 90 minutes. Thereafter, the grafts are incubated overnight at 37-44° C. (minimum of 6 hours, preferably 12 to 18 hours).
  • [0126]
    After incubation, the hydrogen peroxide is decanted and the basin is filled with 70% isopropyl alcohol/30% glycerin USP and the grafts are incubated at room temperature for a minimum of 30 minutes. Thereafter, the isopropyl alcohol/glycerin USP solution is decanted and the container is filled with warm 30% glycerin USP in sterile water. The grafts are incubated for a minimum of 30 minutes. Methods of incubation include for example: soaking and mild agitation.
  • [0127]
    The solution is then decanted and the Cloward dowels are removed from the container. The Cloward dowels are then placed into a sterile container. The container is sealed and placed into the centrifuge. The centrifuge is balanced. The grafts are then centrifuged for 3-5 minutes to dry and the remaining solution is removed.
  • [0128]
    The width and length of the Cloward(s) are measured, graft identification numbers are assigned, and the information is recorded on the “Tissue Processing Log Worksheet”. One graft is then placed into a glass, 120 cc bottle and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The bottled grafts are either frozen and packaged, or frozen and freeze-dried and packaged.
  • EXAMPLE 8 Processing of an Iliac Crest Wedge
  • [0129]
    A. Cleaning and Processing: The soft tissue, periosteum, and cartilage is removed from an ilium. The ilium is placed in a Pan-A-Vise™ by removing a section of the ilium, allowing the vise jaws to grip the tissue securely. A Stryker saw is assembled with parallel cutting blades (12, 14, 16, 18, or 20 mm). The set-point at the forward aspect of the cutter is placed and locked. The apparatus is placed on the tissue to be fashioned and cutting is begun at a moderate speed.
  • [0130]
    After the set-point has made a deep cut in the tissue, and the teeth have begun to cut into the tissue, cutting is stopped, and the set-point apparatus is checked. Cutting is continued using the marks created as a guide. A Stryker® saw or band saw is then used to remove the cut grafts after all have been cut.
  • [0131]
    Any cartilage is trimmed from the cortical face of the grafts(s) using a scalpel and a #10 blade. The distal end of the graft perpendicular to the body of the graft is trimmed with a band saw making sure the fashioned graft is at least 15 mm long. The Grafts is then cleansed using a pulsatile water apparatus. If the surface marrow is not easily removed, the graft(s) is dry spun at 2600 rpm for 3 minutes.
  • [0132]
    B. Plasticization: The Iliac Crest Wedge(s) are then placed in a sterile container with hydrogen peroxide (3%) and glycerin USP (30%) at 37 to 44° C. The container is sealed and placed into the centrifuge. The centrifuge is balanced. The grafts are then centrifuged at 2600 rpm for 15 minutes. The tissue is removed from the centrifuge and the grafts are placed into the ultrasonic cleaner. Equal volumes of Allowash™ Solution, hydrogen peroxide (3%), glycerin USP (30%), and antibiotics are added to the ultrasonic cleaner, and the grafts are sonicated at 37-44° C. for a minimum of 1 hour.
  • [0133]
    The tissue is then removed from the ultrasonic cleaner. The mixture is decanted and a sterile glass container is filled with fresh 3% hydrogen peroxide/30% glycerin USP. The grafts are placed in the container, the top is sealed and the container is taken to a large ultrasonic cleaner. The grafts are sonicated for 90 minutes. Thereafter, the grafts are incubated overnight at 37-44° C. (minimum of 6 hours, preferably for 12 to 18 hours). Methods of incubation include for example: soaking and mild agitation.
  • [0134]
    The hydrogen peroxide/glycerin USP is then decanted and the basin is filled with 70% isopropyl alcohol/30% glycerin USP. The grafts are then incubated at room temperature for a minimum of 30 minutes. The isopropyl alcohol/glycerin USP solution is then decanted and the container is filled with warm 30% glycerin USP in water. The grafts are incubated for a minimum of 30 minutes.
  • [0135]
    The glycerin USP solution is then decanted and the Iliac Crest Wedges are removed from the container. The Iliac Crest Wedges are then placed into a sterile container. The container is sealed and placed into the centrifuge. The centrifuge is balanced and the grafts are centrifuged for 3-5 minutes to dry and the remaining solution is removed.
  • [0136]
    The width and length of the Wedges are measured, graft identification numbers are assigned, and the information is recorded on the “Tissue Processing Log Worksheet”. One graft is then placed into a glass, 120 cc bottle and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The bottled grafts are either frozen and packaged, or frozen and freeze-dried and packaged.
  • EXAMPLE 9 Processing of Fascia Lata
  • [0137]
    A. Cleaning and Processing: Any remaining muscle tissue is removed from the fascia lata. The fascia is placed with the subcutaneous layer uppermost, on a clean, drape towel. Using blunt dissection techniques, all of the fat and extraneous soft tissue is removed from the graft material. The graft is kept moist with sterile water to prevent desiccation during processing.
  • [0138]
    Any torn fibers are removed from the edges of the graft material, and a graft rectangular in shape is created. The graft(s) are then placed in a basin containing a 1:100 dilution of Allowash™ Solution or other surfactant(s) for at least 15 minutes. The basin is labeled as Allowash™ Solution. The time of exposure is recorded on the Tissue Processing Log Worksheet.
  • [0139]
    B. Plasticization: The graft(s)are placed into an empty basin labeled “Rinse”. The graft(s) are rinsed three time with copious amounts of sterile water to remove any residual detergents. Any sterile water which accumulates in the Rinse basin is discarded The number of rinses is recorded on the Tissue Processing Log Worksheet. The fashioned graft(s) are then placed in the basin containing U.S.P. grade 70% isopropyl alcohol containing 30% glycerin USP for 2-5 minutes. The basin is labeled IPA/Glycerin. The time of exposure to the alcohol/glycerin USP solution is recorded in the Tissue Processing Log Worksheet.
  • [0140]
    The graft(s) are then placed into the basin containing the antibiotic solution in 30% glycerin USP for at least 15 minutes. The basin is labeled as Antibiotics/Glycerin USP. The exposure time to the antibiotics/glycerin USP is recorded on the Tissue Processing Log Worksheet. The graft(s) are then thoroughly soaked by immersing each deposit into sterile 30% glycerin USP in deionized/distilled water for a minimum of 5 minutes to remove excess antibiotics. Enough sterile glycerin USP solution is needed to cover the graft(s). The basin is labeled as Rinse. The time of exposure to the glycerin USP rinse solution is recorded on the Tissue Processing Log Worksheet.
  • [0141]
    The fashioned graft(s) are then placed on sterile fine mesh gauze, and the gauze is trimmed to just beyond the edges of the graft. The width and length of the graft(s) is measured to the nearest tenth of a centimeter. The graft(s) are assigned identification numbers and this information is recorded on the Tissue Processing Log Worksheet. The graft and gauze is then rolled into a tube and graft material is then placed into glass, 120 ml bottles, and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The graft material is now ready for wrapping and freeze-drying or dehydrating.
  • EXAMPLE 10 Processing Pericardium
  • [0142]
    A. Cleaning and Processing: The pericardial tissue is rinsed of any blood or pericardial fluid in sterile water in the basin labeled Rinse. The pericardium is then placed on a clean drape towel. Using blunt dissection techniques, all of the fat and extraneous soft tissue is removed from the graft material. The graft is kept moist with sterile water to prevent desiccation during processing. Any torn fibers are removed from the edges of the graft material, and a graft rectangular in shape is created. The graft(s) are then placed in a basin containing a 1:100 dilution of Allowash Solution or other surfactant(s) for at least 15 minutes. The basin is labeled as Allowash™ Solution. The time of exposure is recorded on the Tissue Processing Log Worksheet.
  • [0143]
    The graft(s)are placed into an empty basin labeled “Rinse”. The graft(s) are rinsed three time with copious amounts of sterile water to remove any residual detergents. Any sterile water which accumulates in the Rinse basin is discarded. The number of rinses is recorded on the Tissue Processing Log Worksheet. The fashioned graft(s) are then placed in the basin containing U.S.P. grade 70% isopropyl alcohol containing 30% glycerin USP for 2-5 minutes. The basin is labeled IPA/Glycerin. The time of exposure to the alcohol/glycerin USP solution is recorded in the Tissue Processing Log Worksheet.
  • [0144]
    The graft(s) are then placed into the basin containing the antibiotic solution in 30% glycerin USP for at least 15 minutes. The basin is labeled as Antibiotics/Glycerin USP. The exposure time to the antibiotics/glycerin USP is recorded on the Tissue Processing Log Worksheet. The graft(s) are then thoroughly soaked by immersing each deposit into sterile 30% glycerin USP in deionized/distilled water for a minimum of 5 minutes, preferably from 10 to 15 minutes, to remove excess antibiotics. Enough sterile glycerin USP-solution is needed to cover the graft(s). The basin is labeled as Rinse. The time of exposure to the glycerin USP rinse solution is recorded on the Tissue Processing Log Worksheet.
  • [0145]
    The fashioned graft(s) are then placed on sterile fine mesh gauze, and the gauze is trimmed to just beyond the edges of the graft. The width and length of the graft(s) is measured to the nearest tenth of a centimeter. The graft(s) are assigned identification numbers and this information is recorded on the Tissue Processing Log Worksheet. The graft and gauze is then rolled into a tube and graft material is then placed into glass, 120 ml bottles, and the printed label is affixed with the unique numeric designator. This step is repeated until all deposits are bottled. The graft material is now wrapped and placed in a freeze dryer or dehydrated.
  • [0146]
    All of the publications and patent applications cited herein are hereby incorporated by reference into the present disclosure. It will be appreciated by those skilled in the art that various modifications can be made without departing from the essential nature thereof. It is intended to encompass all such modifications within the scope of the appended claims.
  • What is claimed:

Claims (32)

1. A plasticized bone graft, comprising:
a cleaned bone graft comprising one or more plasticizers.
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.
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.
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 %.
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.
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.
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.
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.
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 %.
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.
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.
US09940545 1998-06-30 2001-08-29 Plasticized bone and soft tissue grafts and methods of making and using same Abandoned US20030083752A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09107459 US6293970B1 (en) 1998-06-30 1998-06-30 Plasticized bone and soft tissue grafts and methods of making and using same
US09940545 US20030083752A1 (en) 1998-06-30 2001-08-29 Plasticized bone and soft tissue grafts and methods of making and using same

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US09940545 US20030083752A1 (en) 1998-06-30 2001-08-29 Plasticized bone and soft tissue grafts and methods of making and using same
US11053454 US20050246035A1 (en) 1998-06-30 2005-02-09 Plasticized bone and soft tissue grafts and methods of making and using same
US12701634 US9579420B2 (en) 1998-06-30 2010-02-08 Plasticized bone and soft tissue grafts and methods of making and using same
US13836803 US9125971B2 (en) 1998-06-30 2013-03-15 Plasticized bone and soft tissue grafts and methods of making and using same
US14193040 US9585986B2 (en) 1998-06-30 2014-02-28 Plasticized bone and soft tissue grafts and methods of making and using same

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09107459 Division US6293970B1 (en) 1998-06-30 1998-06-30 Plasticized bone and soft tissue grafts and methods of making and using same

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11053454 Continuation US20050246035A1 (en) 1998-06-30 2005-02-09 Plasticized bone and soft tissue grafts and methods of making and using same

Publications (1)

Publication Number Publication Date
US20030083752A1 true true US20030083752A1 (en) 2003-05-01

Family

ID=22316720

Family Applications (8)

Application Number Title Priority Date Filing Date
US09107459 Active US6293970B1 (en) 1998-06-30 1998-06-30 Plasticized bone and soft tissue grafts and methods of making and using same
US09874862 Active US6569200B2 (en) 1998-06-30 2001-06-05 Plasticized soft tissue grafts, and methods of making and using same
US09887418 Active US6544289B2 (en) 1998-06-30 2001-06-22 Plasticized bone grafts, and methods of making and using same
US09940545 Abandoned US20030083752A1 (en) 1998-06-30 2001-08-29 Plasticized bone and soft tissue grafts and methods of making and using same
US11053454 Abandoned US20050246035A1 (en) 1998-06-30 2005-02-09 Plasticized bone and soft tissue grafts and methods of making and using same
US12701634 Active US9579420B2 (en) 1998-06-30 2010-02-08 Plasticized bone and soft tissue grafts and methods of making and using same
US13836803 Active US9125971B2 (en) 1998-06-30 2013-03-15 Plasticized bone and soft tissue grafts and methods of making and using same
US14193040 Active US9585986B2 (en) 1998-06-30 2014-02-28 Plasticized bone and soft tissue grafts and methods of making and using same

Family Applications Before (3)

Application Number Title Priority Date Filing Date
US09107459 Active US6293970B1 (en) 1998-06-30 1998-06-30 Plasticized bone and soft tissue grafts and methods of making and using same
US09874862 Active US6569200B2 (en) 1998-06-30 2001-06-05 Plasticized soft tissue grafts, and methods of making and using same
US09887418 Active US6544289B2 (en) 1998-06-30 2001-06-22 Plasticized bone grafts, and methods of making and using same

Family Applications After (4)

Application Number Title Priority Date Filing Date
US11053454 Abandoned US20050246035A1 (en) 1998-06-30 2005-02-09 Plasticized bone and soft tissue grafts and methods of making and using same
US12701634 Active US9579420B2 (en) 1998-06-30 2010-02-08 Plasticized bone and soft tissue grafts and methods of making and using same
US13836803 Active US9125971B2 (en) 1998-06-30 2013-03-15 Plasticized bone and soft tissue grafts and methods of making and using same
US14193040 Active US9585986B2 (en) 1998-06-30 2014-02-28 Plasticized bone and soft tissue grafts and methods of making and using same

Country Status (1)

Country Link
US (8) US6293970B1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030036800A1 (en) * 2000-07-13 2003-02-20 Meredith Thomas L. Composite bone material implant and method
US20030100948A1 (en) * 2000-11-24 2003-05-29 Swabey Ogilvy Renault Connective tissue substitutes, method of preparation and uses thereof
US20030135284A1 (en) * 1998-06-30 2003-07-17 Katrina Crouch Plasticized bone grafts and methods of making and using same
US20030217415A1 (en) * 1998-06-30 2003-11-27 Katrina Crouch Plasticized bone grafts and methods of making and using same
US20050246035A1 (en) * 1998-06-30 2005-11-03 Wolfinbarger Lloyd Jr Plasticized bone and soft tissue grafts and methods of making and using same
US20080102439A1 (en) * 2006-10-27 2008-05-01 Bin Tian Biological tissue for surgical implantation
US20090157082A1 (en) * 2007-08-11 2009-06-18 Meredith Thomas L Portable Bone Grinder
US20100030340A1 (en) * 1998-06-30 2010-02-04 Wolfinbarger Jr Lloyd Plasticized Grafts and Methods of Making and Using Same
US20110214398A1 (en) * 2010-03-05 2011-09-08 Edwards Lifesciences Corporation Dry Prosthetic Heart Valve Packaging System
US8563232B2 (en) 2000-09-12 2013-10-22 Lifenet Health Process for devitalizing soft-tissue engineered medical implants, and devitalized soft-tissue medical implants produced
US9498317B2 (en) 2010-12-16 2016-11-22 Edwards Lifesciences Corporation Prosthetic heart valve delivery systems and packaging
US9744043B2 (en) 2007-07-16 2017-08-29 Lifenet Health Crafting of cartilage

Families Citing this family (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6214054B1 (en) * 1998-09-21 2001-04-10 Edwards Lifesciences Corporation Method for fixation of biological tissues having mitigated propensity for post-implantation calcification and thrombosis and bioprosthetic devices prepared thereby
US6734018B2 (en) * 1999-06-07 2004-05-11 Lifenet Process for decellularizing soft-tissue engineered medical implants, and decellularized soft-tissue medical implants produced
US20080077251A1 (en) * 1999-06-07 2008-03-27 Chen Silvia S Cleaning and devitalization of cartilage
EP1498089A1 (en) 1999-12-15 2005-01-19 Zimmer GmbH Preparation for repairing cartilage defects or cartilage/bone defects in human or animal joints
US6739112B1 (en) * 2000-08-21 2004-05-25 Nu Vasive, Inc. Bone allograft packaging system
WO2002015948A9 (en) * 2000-08-24 2003-04-03 Osteotech Inc Method of treating and dehydrating bone for implantation
US6743574B1 (en) 2000-09-12 2004-06-01 Lifenet Process for devitalizing soft-tissue engineered medical implants, and devitalized soft-tissue medical implants produced
WO2002060347A8 (en) * 2001-01-31 2003-05-08 Maria-Grazia Ascenzi Modeling viscoelastic torsional properties of osteons
WO2002033679A8 (en) * 2000-10-17 2003-08-07 Maria-Grazia Ascenzi System and method for modeling bone structure
US7212958B2 (en) * 2001-10-17 2007-05-01 Maria-Grazia Ascenzi Method and system for modelling bone structure
US7353153B2 (en) * 2001-10-17 2008-04-01 Maria-Grazia Ascenzi Method and system for modeling bone structure
US7283940B2 (en) * 2001-10-17 2007-10-16 Maria-Grazia Ascenzi Multidirectional morphology and mechanics of osteonic lamellae
US6648894B2 (en) * 2000-12-21 2003-11-18 Stryker Spine Bone graft forming guide and method of forming bone grafts
CA2454341C (en) * 2001-07-19 2012-10-30 Prochon Biotech Ltd. Plasma protein matrices and methods for their preparation
US6878168B2 (en) 2002-01-03 2005-04-12 Edwards Lifesciences Corporation Treatment of bioprosthetic tissues to mitigate post implantation calcification
US8308797B2 (en) 2002-01-04 2012-11-13 Colibri Heart Valve, LLC Percutaneously implantable replacement heart valve device and method of making same
WO2004067050A1 (en) * 2003-01-28 2004-08-12 Osteotech, Inc. Tissue pathogen inactivation/removal process
CA2514474C (en) * 2003-01-30 2014-05-06 Avner Yayon Freeze-dried fibrin matrices and methods for preparation thereof
USRE43258E1 (en) 2003-04-29 2012-03-20 Musculoskeletal Transplant Foundation Glue for cartilage repair
US7067123B2 (en) 2003-04-29 2006-06-27 Musculoskeletal Transplant Foundation Glue for cartilage repair
US7901457B2 (en) 2003-05-16 2011-03-08 Musculoskeletal Transplant Foundation Cartilage allograft plug
US20050020506A1 (en) * 2003-07-25 2005-01-27 Drapeau Susan J. Crosslinked compositions comprising collagen and demineralized bone matrix, methods of making and methods of use
US20050085922A1 (en) * 2003-10-17 2005-04-21 Shappley Ben R. Shaped filler for implantation into a bone void and methods of manufacture and use thereof
US20060228252A1 (en) * 2004-04-20 2006-10-12 Mills C R Process and apparatus for treating implants comprising soft tissue
US7648676B2 (en) * 2004-04-20 2010-01-19 Rti Biologics, Inc. Process and apparatus for treating implants comprising soft tissue
US8435551B2 (en) 2007-03-06 2013-05-07 Musculoskeletal Transplant Foundation Cancellous construct with support ring for repair of osteochondral defects
US20060111779A1 (en) 2004-11-22 2006-05-25 Orthopedic Development Corporation, A Florida Corporation Minimally invasive facet joint fusion
US20060111780A1 (en) * 2004-11-22 2006-05-25 Orthopedic Development Corporation Minimally invasive facet joint hemi-arthroplasty
US8021392B2 (en) * 2004-11-22 2011-09-20 Minsurg International, Inc. Methods and surgical kits for minimally-invasive facet joint fusion
US20060111786A1 (en) * 2004-11-22 2006-05-25 Orthopedic Development Corporation Metallic prosthetic implant for use in minimally invasive acromio-clavicular shoulder joint hemi-arthroplasty
WO2006135901A3 (en) * 2005-06-13 2007-10-25 Maria-Grazia Ascenzi Method and system for modeling bone structure
US7815926B2 (en) 2005-07-11 2010-10-19 Musculoskeletal Transplant Foundation Implant for articular cartilage repair
CA2623106C (en) 2005-09-19 2013-12-24 Histogenics Corp. Cell-support matrix having narrowly defined uniformly vertically and non-randomly organized porosity and pore density and a method for preparation thereof
US20070162132A1 (en) 2005-12-23 2007-07-12 Dominique Messerli Flexible elongated chain implant and method of supporting body tissue with same
US7771741B2 (en) * 2006-05-01 2010-08-10 Warsaw Orthopedic, Inc Demineralized bone matrix devices
US7838022B2 (en) 2006-05-01 2010-11-23 Warsaw Orthopedic, Inc Malleable implants containing demineralized bone matrix
US8506983B2 (en) * 2006-05-01 2013-08-13 Warsaw Orthopedic, Inc. Bone filler material
US20100209470A1 (en) * 2006-05-01 2010-08-19 Warsaw Orthopedic, Inc. An Indiana Corporation Demineralized bone matrix devices
US8460860B2 (en) * 2006-05-08 2013-06-11 Nuvasive, Inc. Cancellous bone treated with collagenase and essentially free of blood cells
US20080262633A1 (en) * 2006-05-08 2008-10-23 Williams Michelle Leroux Cancellous bone treated with collagenase and essentially free of blood cells
US8372437B2 (en) 2006-08-17 2013-02-12 Mimedx Group, Inc. Placental tissue grafts
JP2010511474A (en) * 2006-12-08 2010-04-15 ザ ユニバーシティ オブ ワイカトThe University Of Waikato Medical preparations
US7837740B2 (en) 2007-01-24 2010-11-23 Musculoskeletal Transplant Foundation Two piece cancellous construct for cartilage repair
WO2009111069A1 (en) 2008-03-05 2009-09-11 Musculoskeletal Transplant Foundation Cancellous constructs, cartilage particles and combinations of cancellous constructs and cartilage particles
US9101691B2 (en) 2007-06-11 2015-08-11 Edwards Lifesciences Corporation Methods for pre-stressing and capping bioprosthetic tissue
US9125743B2 (en) * 2007-07-16 2015-09-08 Lifenet Health Devitalization and recellularization of cartilage
EP2197270B1 (en) 2007-09-07 2016-12-14 Surgical Biologics Placental tissue grafts and improved methods of preparing and using the same
US9138509B2 (en) * 2007-09-14 2015-09-22 Musculoskeletal Transplant Foundation Composition for filling bone defects
US9056150B2 (en) * 2007-12-04 2015-06-16 Warsaw Orthopedic, Inc. Compositions for treating bone defects
US8357387B2 (en) 2007-12-21 2013-01-22 Edwards Lifesciences Corporation Capping bioprosthetic tissue to reduce calcification
US20100297766A1 (en) * 2008-02-04 2010-11-25 Hai-Qing Xian Method of Removing Undesired Tissue from Connective Tissue
US8840913B2 (en) 2008-03-27 2014-09-23 Warsaw Orthopedic, Inc. Malleable multi-component implants and materials therefor
US20090275129A1 (en) 2008-04-30 2009-11-05 Ethicon, Inc. Tissue engineered blood vessels
US20110143429A1 (en) * 2008-04-30 2011-06-16 Iksoo Chun Tissue engineered blood vessels
US8858698B2 (en) * 2008-09-05 2014-10-14 Mentor Worldwide Llc Acellular matrix glue
EP2358407B1 (en) * 2008-12-19 2015-12-09 Industrie Biomediche Insubri S/A Bone implant matrix and method of preparing the same
US9150318B1 (en) 2009-01-02 2015-10-06 Lifecell Corporation Method for sterilizing an acellular tissue matrix
US20100249929A1 (en) * 2009-03-24 2010-09-30 Joint Restoration Foundation Adjustable patella ligament for acl repair
WO2011109450A3 (en) 2010-03-01 2012-01-05 Colibri Heart Valve Llc Percutaneously deliverable heart valve and methods associated therewith
US20110300625A1 (en) * 2010-03-01 2011-12-08 Vela Biosystems Llc Tissue for prosthetic implants and grafts, and methods associated therewith
CA2794121C (en) 2010-03-23 2016-10-11 Edwards Lifesciences Corporation Methods of conditioning sheet bioprosthetic tissue
US8906601B2 (en) 2010-06-17 2014-12-09 Edwardss Lifesciences Corporation Methods for stabilizing a bioprosthetic tissue by chemical modification of antigenic carbohydrates
EP2585157A4 (en) 2010-06-28 2017-02-08 Colibri Heart Valve Llc Method and apparatus for the endoluminal delivery of intravascular devices
US8435305B2 (en) 2010-08-31 2013-05-07 Zimmer, Inc. Osteochondral graft delivery device and uses thereof
US9351829B2 (en) 2010-11-17 2016-05-31 Edwards Lifesciences Corporation Double cross-linkage process to enhance post-implantation bioprosthetic tissue durability
US9737400B2 (en) 2010-12-14 2017-08-22 Colibri Heart Valve Llc Percutaneously deliverable heart valve including folded membrane cusps with integral leaflets
US20140005793A1 (en) * 2012-06-21 2014-01-02 Keith Cameron Koford Novel biological implant compositions, implants and methods
EP2692363A1 (en) 2012-07-31 2014-02-05 Geistlich Pharma AG Hydrophilic phosphate group containing dehydrated partially purified bone replacement material
KR101619033B1 (en) 2012-07-31 2016-05-09 가이스틀리히 파마 아게 Hydrophilic phosphate group containing dehydrated partially purified bone replacement material
EP2692364A1 (en) 2012-07-31 2014-02-05 Geistlich Pharma AG Non-plasticized hydrophilic phosphate group containing dehydrated partially purified bone replacement material
US9615922B2 (en) 2013-09-30 2017-04-11 Edwards Lifesciences Corporation Method and apparatus for preparing a contoured biological tissue
US9610143B2 (en) * 2014-06-19 2017-04-04 Osteolife Biomedical, Llc Compressed decalcified trabecular bone grafts and tooth socket repair

Citations (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US496612A (en) * 1893-05-02 Hay-tedder
US3458397A (en) * 1966-12-08 1969-07-29 Squibb & Sons Inc Process for producing osteogenic material
US4278701A (en) * 1977-03-09 1981-07-14 Hagens Gunther Von Animal and vegetal tissues permanently preserved by synthetic resin impregnation
US4539716A (en) * 1981-03-19 1985-09-10 Massachusetts Institute Of Technology Fabrication of living blood vessels and glandular tissues
US4546500A (en) * 1981-05-08 1985-10-15 Massachusetts Institute Of Technology Fabrication of living blood vessels and glandular tissues
US4776853A (en) * 1986-07-28 1988-10-11 Hsc Research Development Corporation Process for preparing biological mammalian implants
US4801299A (en) * 1983-06-10 1989-01-31 University Patents, Inc. Body implants of extracellular matrix and means and methods of making and using such implants
US4835102A (en) * 1987-03-31 1989-05-30 Eugene Bell Tissue equivalent test systems
US4846835A (en) * 1987-06-15 1989-07-11 Grande Daniel A Technique for healing lesions in cartilage
US5061286A (en) * 1989-08-18 1991-10-29 Osteotech, Inc. Osteoprosthetic implant
US5116552A (en) * 1990-01-31 1992-05-26 Gunze Limited Process for preparation of dried collagen sponge
US5171273A (en) * 1989-01-13 1992-12-15 University Of Medicine And Dentistry Of New Jersey Synthetic collagen orthopaedic structures such as grafts, tendons and other structures
US5290558A (en) * 1989-09-21 1994-03-01 Osteotech, Inc. Flowable demineralized bone powder composition and its use in bone repair
US5333626A (en) * 1991-12-31 1994-08-02 Cryolife, Inc. Preparation of bone for transplantation
US5336616A (en) * 1990-09-12 1994-08-09 Lifecell Corporation Method for processing and preserving collagen-based tissues for transplantation
US5352463A (en) * 1992-11-13 1994-10-04 Badylak Steven F Tissue graft for surgical reconstruction of a collagenous meniscus and method therefor
US5432712A (en) * 1990-05-29 1995-07-11 Axiom Innovation Limited Machine vision stereo matching
US5466462A (en) * 1992-03-25 1995-11-14 Johnson & Johnson Medical, Inc. Heteromorphic sponges containing active agents
US5507813A (en) * 1993-12-09 1996-04-16 Osteotech, Inc. Shaped materials derived from elongate bone particles
US5513662A (en) * 1991-12-31 1996-05-07 Osteotech, Inc. Preparation of bone for transplantation
US5525646A (en) * 1991-03-04 1996-06-11 Lundgren; Dan Bioresorbable material and an article of manufacture made of such material for medical use
US5556379A (en) * 1994-08-19 1996-09-17 Lifenet Research Foundation Process for cleaning large bone grafts and bone grafts produced thereby
US5558875A (en) * 1994-06-06 1996-09-24 Wang; Su Method of preparing collagenous tissue
US5598838A (en) * 1995-04-07 1997-02-04 Healthdyne Technologies, Inc. Pressure support ventilatory assist system
US5607476A (en) * 1991-10-07 1997-03-04 Osteotech, Inc. Processing of fibrous connective tissue
US5613982A (en) * 1994-03-14 1997-03-25 Cryolife, Inc. Method of preparing transplant tissue to reduce immunogenicity upon implantation
US5718012A (en) * 1996-05-28 1998-02-17 Organogenesis, Inc. Method of strength enhancement of collagen constructs
US5792603A (en) * 1995-04-27 1998-08-11 Advanced Tissue Sciences, Inc. Apparatus and method for sterilizing, seeding, culturing, storing, shipping and testing tissue, synthetic or native, vascular grafts
US5797871A (en) * 1994-08-19 1998-08-25 Lifenet Research Foundation Ultrasonic cleaning of allograft bone
US5843181A (en) * 1994-04-18 1998-12-01 Hancock Jaffe Laboratories Biological material pre-fixation treatment
US5855620A (en) * 1995-04-19 1999-01-05 St. Jude Medical, Inc. Matrix substrate for a viable body tissue-derived prosthesis and method for making the same
US5855617A (en) * 1991-03-05 1999-01-05 Colorado State University Research Foundation Treated tissue for implantation and methods of treatment and use
US5856367A (en) * 1994-02-18 1999-01-05 Minnesota Mining And Manufacturing Company Biocompatible porous matrix of bioabsorbable material
US5863531A (en) * 1986-04-18 1999-01-26 Advanced Tissue Sciences, Inc. In vitro preparation of tubular tissue structures by stromal cell culture on a three-dimensional framework
US5885617A (en) * 1994-07-12 1999-03-23 Bpsi Holdings, Inc. Moisture barrier film coating composition, method, and coated form
US5899939A (en) * 1998-01-21 1999-05-04 Osteotech, Inc. Bone-derived implant for load-supporting applications
US5916266A (en) * 1995-10-31 1999-06-29 Bio-Engineering Laboratories, Ltd. Raw membranous material for medical materials and manufacturing methods thereof
US5928945A (en) * 1996-11-20 1999-07-27 Advanced Tissue Sciences, Inc. Application of shear flow stress to chondrocytes or chondrocyte stem cells to produce cartilage
US5944755A (en) * 1995-09-15 1999-08-31 Crosscart, Inc. Articular cartilage xenografts
US5977432A (en) * 1997-06-09 1999-11-02 Life Net Research Foundation Process for cleaning bone grafts using centrifugal force and bone grafts produced thereby
US5976104A (en) * 1994-08-19 1999-11-02 Lifenet Research Foundation Recirculation method for cleaning essentially intact bone grafts using pressure mediated flow of solutions and bone grafts produced thereby
US5977034A (en) * 1994-08-19 1999-11-02 Lifenet Research Foundation Composition for cleaning bones
US5993844A (en) * 1997-05-08 1999-11-30 Organogenesis, Inc. Chemical treatment, without detergents or enzymes, of tissue to form an acellular, collagenous matrix
US5997896A (en) * 1995-06-07 1999-12-07 Organogenesis, Inc. Reconstituted collagen fiber segment compositions and methods of preparation thereof
US6024735A (en) * 1996-03-20 2000-02-15 Lifenet Research Foundation Process and composition for cleaning soft tissue grafts optionally attached to bone and soft tissue and bone grafts produced thereby
US6110206A (en) * 1995-09-15 2000-08-29 Crosscart, Inc. Anterior cruciate ligament xenografts
US6162258A (en) * 1999-08-25 2000-12-19 Osteotech, Inc. Lyophilized monolithic bone implant and method for treating bone
US6200347B1 (en) * 1999-01-05 2001-03-13 Lifenet Composite bone graft, method of making and using same
US6241771B1 (en) * 1997-08-13 2001-06-05 Cambridge Scientific, Inc. Resorbable interbody spinal fusion devices
US20010004715A1 (en) * 1998-06-24 2001-06-21 Carlos M. G. Duran Compliant dehydrated tissue for implantation and process of making the same
US6293970B1 (en) * 1998-06-30 2001-09-25 Lifenet Plasticized bone and soft tissue grafts and methods of making and using same
US6294041B1 (en) * 1998-02-06 2001-09-25 Osteotech, Inc. Method for an osteoimplant manufacture
US6312474B1 (en) * 1999-09-15 2001-11-06 Bio-Vascular, Inc. Resorbable implant materials
US6352708B1 (en) * 1999-10-14 2002-03-05 The International Heart Institute Of Montana Foundation Solution and method for treating autologous tissue for implant operation
US6371992B1 (en) * 1997-12-19 2002-04-16 The Regents Of The University Of California Acellular matrix grafts: preparation and use
US6376244B1 (en) * 1999-12-29 2002-04-23 Children's Medical Center Corporation Methods and compositions for organ decellularization
US6416995B1 (en) * 1999-11-22 2002-07-09 Bio Science Consultants, L.L.C. Bioreactor mediated recellularization of natural and tissue engineered vascular grafts
US6428802B1 (en) * 1999-12-29 2002-08-06 Children's Medical Center Corp. Preparing artificial organs by forming polylayers of different cell populations on a substrate
US6432710B1 (en) * 1998-05-22 2002-08-13 Isolagen Technologies, Inc. Compositions for regenerating tissue that has deteriorated, and methods for using such compositions
US6448076B2 (en) * 1998-09-15 2002-09-10 The Regents Of The University Of Michigan Method for chemically acellularizing a biological tissue sample
US6455818B1 (en) * 2001-08-23 2002-09-24 Maytag Corporation Downdraft filter assembly for a cooking appliance
US6479064B1 (en) * 1999-12-29 2002-11-12 Children's Medical Center Corporation Culturing different cell populations on a decellularized natural biostructure for organ reconstruction
US20030087428A1 (en) * 1999-06-07 2003-05-08 Lloyd Wolfinbarger Process for decellularizing soft-tissue engineered medical implants, and decellularized soft-tissue medical implants produced
US20030135284A1 (en) * 1998-06-30 2003-07-17 Katrina Crouch Plasticized bone grafts and methods of making and using same
US20030217415A1 (en) * 1998-06-30 2003-11-27 Katrina Crouch Plasticized bone grafts and methods of making and using same
US20040057936A1 (en) * 2002-09-23 2004-03-25 Cheung David T. Method to treat collagenous connective tissue for implant remodeled by host cells into living tissue
US6743574B1 (en) * 2000-09-12 2004-06-01 Lifenet Process for devitalizing soft-tissue engineered medical implants, and devitalized soft-tissue medical implants produced
US6783556B1 (en) * 2000-09-26 2004-08-31 Shlomo Gabbay System and method for making a calotte-shaped implantable sheath

Family Cites Families (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4357274A (en) 1981-08-06 1982-11-02 Intermedicat Gmbh Process for the manufacture of sclero protein transplants with increased biological stability
US4678470A (en) * 1985-05-29 1987-07-07 American Hospital Supply Corporation Bone-grafting material
US4969912A (en) * 1988-02-18 1990-11-13 Kelman Charles D Human collagen processing and autoimplant use
US4950296A (en) * 1988-04-07 1990-08-21 Mcintyre Jonathan L Bone grafting units
US4810299A (en) * 1988-05-20 1989-03-07 Westvaco Corporation Cationic aqueous bituminous emulsion-aggregate slurries
US5095925A (en) * 1989-03-13 1992-03-17 Elledge David M Aseptic cleaning apparatus
US5118512A (en) 1990-01-23 1992-06-02 Osteotech, Inc. (A Delaware Corp.) Process for cryopreserving biological materials and materials prepared thereby
US5120833A (en) * 1991-03-15 1992-06-09 Alexander Kaplan Method of producing grafts
US5357636A (en) * 1992-06-30 1994-10-25 Dresdner Jr Karl P Flexible protective medical gloves and methods for their use
US5716405A (en) * 1993-03-05 1998-02-10 Mittelman; Harry Rhinoplasty kit
US5531791A (en) * 1993-07-23 1996-07-02 Bioscience Consultants Composition for repair of defects in osseous tissues, method of making, and prosthesis
CA2186374A1 (en) * 1994-04-29 1995-11-09 William Carl Bruchman Improved blood contact surfaces employing natural subendothelial matrix and method for making and using the same
JPH10509610A (en) 1994-11-09 1998-09-22 カストロ・ムノズレド,フェデリコ Bandages and their preservation method for wound repair
JP3471967B2 (en) * 1995-03-28 2003-12-02 カネボウ株式会社 Hybrid artificial tooth root
DE19513177A1 (en) 1995-03-31 1996-10-02 Dizg Deutsches Inst Fuer Zell Cell layer prepn. and transport system for use in skin transplants
US6121042A (en) * 1995-04-27 2000-09-19 Advanced Tissue Sciences, Inc. Apparatus and method for simulating in vivo conditions while seeding and culturing three-dimensional tissue constructs
US5855610A (en) 1995-05-19 1999-01-05 Children's Medical Center Corporation Engineering of strong, pliable tissues
US6046379A (en) * 1995-06-07 2000-04-04 Stone; Kevin R. Meniscal xenografts
US6039762A (en) * 1995-06-07 2000-03-21 Sdgi Holdings, Inc. Reinforced bone graft substitutes
WO1996039992A1 (en) * 1995-06-07 1996-12-19 Advanced Tissue Sciences, Inc. Apparatus and method for sterilizing, seeding, culturing, storing, shipping, and testing replacement cartilage tissue constructs
EP0880345B1 (en) 1996-01-17 2006-04-05 Osteotech, Inc., Process for producing flexible sheets from demineralized, elongate, bone particles
WO1998007452A1 (en) 1996-08-21 1998-02-26 Sulzer Vascutek Limited Method of sterilising material for implantation
US5989269A (en) 1996-08-30 1999-11-23 Vts Holdings L.L.C. Method, instruments and kit for autologous transplantation
US6110209A (en) * 1997-08-07 2000-08-29 Stone; Kevin R. Method and paste for articular cartilage transplantation
US20010055809A1 (en) 1998-01-30 2001-12-27 Harpal S. Mangat Extending tissue preservation
US6998135B1 (en) 1998-02-27 2006-02-14 Musculoskeletal Transplant Foundation Demineralized corticocancellous bone sheet
US6437018B1 (en) 1998-02-27 2002-08-20 Musculoskeletal Transplant Foundation Malleable paste with high molecular weight buffered carrier for filling bone defects
US6030635A (en) * 1998-02-27 2000-02-29 Musculoskeletal Transplant Foundation Malleable paste for filling bone defects
US6911212B2 (en) 1998-02-27 2005-06-28 Musculoskeletal Transplant Foundation Malleable putty and flowable paste with allograft bone having residual calcium for filling bone defects
WO2000007528A1 (en) 1998-08-06 2000-02-17 Sdgi Holdings, Inc. Composited intervertebral bone spacers
US6958149B2 (en) 1998-10-06 2005-10-25 Stryker Corporation Repair of larynx, trachea, and other fibrocartilaginous tissues
US6652818B1 (en) 1998-11-13 2003-11-25 Regeneration Technologies, Inc. Implant sterilization apparatus
US6482584B1 (en) 1998-11-13 2002-11-19 Regeneration Technologies, Inc. Cyclic implant perfusion cleaning and passivation process
US6294187B1 (en) 1999-02-23 2001-09-25 Osteotech, Inc. Load-bearing osteoimplant, method for its manufacture and method of repairing bone using same
US6454804B1 (en) 1999-10-08 2002-09-24 Bret A. Ferree Engineered tissue annulus fibrosis augmentation methods and apparatus
DE19940426A1 (en) 1999-08-26 2001-03-01 Tutogen Medical Gmbh A method for dehydrating biological tissues for producing preserved transplants
US6648919B2 (en) 1999-10-14 2003-11-18 Bret A. Ferree Transplantation of engineered meniscus tissue to the intervertebral disc
US6379385B1 (en) 2000-01-06 2002-04-30 Tutogen Medical Gmbh Implant of bone matter
US6340477B1 (en) 2000-04-27 2002-01-22 Lifenet Bone matrix composition and methods for making and using same
US7108721B2 (en) 2000-05-11 2006-09-19 Massachusetts Institute Of Technology Tissue regrafting
US6488033B1 (en) 2000-05-15 2002-12-03 Cryolife, Inc. Osteochondral transplant techniques
US8563232B2 (en) 2000-09-12 2013-10-22 Lifenet Health Process for devitalizing soft-tissue engineered medical implants, and devitalized soft-tissue medical implants produced
US6872357B1 (en) 2000-11-22 2005-03-29 Quadrant Drug Delivery Limited Formulation of preservation mixtures containing sensitive biologicals to be stabilized for ambient temperature storage by drying
US6652593B2 (en) 2001-02-28 2003-11-25 Synthes (Usa) Demineralized bone implants
CN1227040C (en) 2001-09-05 2005-11-16 韩士生科有限公司 Production of biomaterial for tissue restoration
CA2463850C (en) 2001-10-18 2013-03-26 Lifecell Corporation Remodeling of tissues and organs
US20030185702A1 (en) 2002-02-01 2003-10-02 Wilson Burgess Methods for sterilizing tissue
US20020106625A1 (en) 2002-02-07 2002-08-08 Hung Clark T. Bioreactor for generating functional cartilaginous tissue
WO2003089566A1 (en) 2002-04-22 2003-10-30 Tufts University Multi-dimensional strain bioreactor
US20040037735A1 (en) 2002-08-23 2004-02-26 Depaula Carl Alexander Allograft tissue purification process for cleaning bone
WO2004067050A1 (en) 2003-01-28 2004-08-12 Osteotech, Inc. Tissue pathogen inactivation/removal process
US20050064042A1 (en) 2003-04-29 2005-03-24 Musculoskeletal Transplant Foundation Cartilage implant plug with fibrin glue and method for implantation
US7067123B2 (en) 2003-04-29 2006-06-27 Musculoskeletal Transplant Foundation Glue for cartilage repair
US7901457B2 (en) 2003-05-16 2011-03-08 Musculoskeletal Transplant Foundation Cartilage allograft plug
WO2005009134A1 (en) 2003-07-21 2005-02-03 Lifecell Corporation ACELLULAR TISSUE MATRICES MADE FROM GALACTOSE α-1,3-GALACTOSE-DEFICIENT TISSUE
WO2005032612A3 (en) 2003-10-02 2005-06-09 Billy E Buck A transplantable particulate bone composition and methods for making and using same
US7157428B2 (en) 2003-11-26 2007-01-02 Histogenics, Corp. Method for treatment and repair of meniscal injuries
US20050196460A1 (en) 2004-03-08 2005-09-08 Malinin Theodore I. Particulate cartilage compositions, processes for their preparation and methods for regenerating cartilage
US20060074466A1 (en) 2004-10-04 2006-04-06 Lostec, Inc. Compositions having improved osteogenesis and methods for making and using same
US20060073592A1 (en) 2004-10-06 2006-04-06 Wendell Sun Methods of storing tissue matrices
US7498040B2 (en) 2005-10-12 2009-03-03 Lifenet Health Compositions for repair of defects in osseous tissues, and methods of making the same
US20070083270A1 (en) 2005-10-12 2007-04-12 Leila Masinaei Orthopedic prosthetic devices containing compositions for repair of defects in osseous tissues
US7498041B2 (en) 2005-10-12 2009-03-03 Lifenet Health Composition for repair of defects in osseous tissues
US7371260B2 (en) 2005-10-26 2008-05-13 Biomet Sports Medicine, Inc. Method and instrumentation for the preparation and transplantation of osteochondral allografts

Patent Citations (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US496612A (en) * 1893-05-02 Hay-tedder
US3458397A (en) * 1966-12-08 1969-07-29 Squibb & Sons Inc Process for producing osteogenic material
US4278701A (en) * 1977-03-09 1981-07-14 Hagens Gunther Von Animal and vegetal tissues permanently preserved by synthetic resin impregnation
US4539716A (en) * 1981-03-19 1985-09-10 Massachusetts Institute Of Technology Fabrication of living blood vessels and glandular tissues
US4546500A (en) * 1981-05-08 1985-10-15 Massachusetts Institute Of Technology Fabrication of living blood vessels and glandular tissues
US4801299A (en) * 1983-06-10 1989-01-31 University Patents, Inc. Body implants of extracellular matrix and means and methods of making and using such implants
US5863531A (en) * 1986-04-18 1999-01-26 Advanced Tissue Sciences, Inc. In vitro preparation of tubular tissue structures by stromal cell culture on a three-dimensional framework
US4776853A (en) * 1986-07-28 1988-10-11 Hsc Research Development Corporation Process for preparing biological mammalian implants
US4835102A (en) * 1987-03-31 1989-05-30 Eugene Bell Tissue equivalent test systems
US4846835A (en) * 1987-06-15 1989-07-11 Grande Daniel A Technique for healing lesions in cartilage
US5171273A (en) * 1989-01-13 1992-12-15 University Of Medicine And Dentistry Of New Jersey Synthetic collagen orthopaedic structures such as grafts, tendons and other structures
US5061286A (en) * 1989-08-18 1991-10-29 Osteotech, Inc. Osteoprosthetic implant
US5290558A (en) * 1989-09-21 1994-03-01 Osteotech, Inc. Flowable demineralized bone powder composition and its use in bone repair
US5298254A (en) * 1989-09-21 1994-03-29 Osteotech, Inc. Shaped, swollen demineralized bone and its use in bone repair
US5116552A (en) * 1990-01-31 1992-05-26 Gunze Limited Process for preparation of dried collagen sponge
US5432712A (en) * 1990-05-29 1995-07-11 Axiom Innovation Limited Machine vision stereo matching
US5336616A (en) * 1990-09-12 1994-08-09 Lifecell Corporation Method for processing and preserving collagen-based tissues for transplantation
US5525646A (en) * 1991-03-04 1996-06-11 Lundgren; Dan Bioresorbable material and an article of manufacture made of such material for medical use
US5855617A (en) * 1991-03-05 1999-01-05 Colorado State University Research Foundation Treated tissue for implantation and methods of treatment and use
US5607476A (en) * 1991-10-07 1997-03-04 Osteotech, Inc. Processing of fibrous connective tissue
US5333626A (en) * 1991-12-31 1994-08-02 Cryolife, Inc. Preparation of bone for transplantation
US5513662A (en) * 1991-12-31 1996-05-07 Osteotech, Inc. Preparation of bone for transplantation
US5466462A (en) * 1992-03-25 1995-11-14 Johnson & Johnson Medical, Inc. Heteromorphic sponges containing active agents
US5352463A (en) * 1992-11-13 1994-10-04 Badylak Steven F Tissue graft for surgical reconstruction of a collagenous meniscus and method therefor
US5507813A (en) * 1993-12-09 1996-04-16 Osteotech, Inc. Shaped materials derived from elongate bone particles
US5856367A (en) * 1994-02-18 1999-01-05 Minnesota Mining And Manufacturing Company Biocompatible porous matrix of bioabsorbable material
US5613982A (en) * 1994-03-14 1997-03-25 Cryolife, Inc. Method of preparing transplant tissue to reduce immunogenicity upon implantation
US5632778A (en) * 1994-03-14 1997-05-27 Cryolife, Inc. Treated tissue for implantation and methods of preparation
US5899936A (en) * 1994-03-14 1999-05-04 Cryolife, Inc. Treated tissue for implantation and methods of preparation
US5843182A (en) * 1994-03-14 1998-12-01 Cryolife, Inc. Treated tissue for implantation and methods of preparation
US5843181A (en) * 1994-04-18 1998-12-01 Hancock Jaffe Laboratories Biological material pre-fixation treatment
US5843180A (en) * 1994-04-18 1998-12-01 Hancock Jaffe Laboratories Method of treating a mammal having a defective heart valve
US5558875A (en) * 1994-06-06 1996-09-24 Wang; Su Method of preparing collagenous tissue
US5885617A (en) * 1994-07-12 1999-03-23 Bpsi Holdings, Inc. Moisture barrier film coating composition, method, and coated form
US5820581A (en) * 1994-08-19 1998-10-13 Lifenet Research Foundation Process for cleaning large bone grafts and bone grafts produced thereby
US5976104A (en) * 1994-08-19 1999-11-02 Lifenet Research Foundation Recirculation method for cleaning essentially intact bone grafts using pressure mediated flow of solutions and bone grafts produced thereby
US5556379A (en) * 1994-08-19 1996-09-17 Lifenet Research Foundation Process for cleaning large bone grafts and bone grafts produced thereby
US5977034A (en) * 1994-08-19 1999-11-02 Lifenet Research Foundation Composition for cleaning bones
US5797871A (en) * 1994-08-19 1998-08-25 Lifenet Research Foundation Ultrasonic cleaning of allograft bone
US5598838A (en) * 1995-04-07 1997-02-04 Healthdyne Technologies, Inc. Pressure support ventilatory assist system
US5855620A (en) * 1995-04-19 1999-01-05 St. Jude Medical, Inc. Matrix substrate for a viable body tissue-derived prosthesis and method for making the same
US5792603A (en) * 1995-04-27 1998-08-11 Advanced Tissue Sciences, Inc. Apparatus and method for sterilizing, seeding, culturing, storing, shipping and testing tissue, synthetic or native, vascular grafts
US5997896A (en) * 1995-06-07 1999-12-07 Organogenesis, Inc. Reconstituted collagen fiber segment compositions and methods of preparation thereof
US5944755A (en) * 1995-09-15 1999-08-31 Crosscart, Inc. Articular cartilage xenografts
US6110206A (en) * 1995-09-15 2000-08-29 Crosscart, Inc. Anterior cruciate ligament xenografts
US5916266A (en) * 1995-10-31 1999-06-29 Bio-Engineering Laboratories, Ltd. Raw membranous material for medical materials and manufacturing methods thereof
US6024735A (en) * 1996-03-20 2000-02-15 Lifenet Research Foundation Process and composition for cleaning soft tissue grafts optionally attached to bone and soft tissue and bone grafts produced thereby
US5718012A (en) * 1996-05-28 1998-02-17 Organogenesis, Inc. Method of strength enhancement of collagen constructs
US5928945A (en) * 1996-11-20 1999-07-27 Advanced Tissue Sciences, Inc. Application of shear flow stress to chondrocytes or chondrocyte stem cells to produce cartilage
US5993844A (en) * 1997-05-08 1999-11-30 Organogenesis, Inc. Chemical treatment, without detergents or enzymes, of tissue to form an acellular, collagenous matrix
US5977432A (en) * 1997-06-09 1999-11-02 Life Net Research Foundation Process for cleaning bone grafts using centrifugal force and bone grafts produced thereby
US6241771B1 (en) * 1997-08-13 2001-06-05 Cambridge Scientific, Inc. Resorbable interbody spinal fusion devices
US6371992B1 (en) * 1997-12-19 2002-04-16 The Regents Of The University Of California Acellular matrix grafts: preparation and use
US5899939A (en) * 1998-01-21 1999-05-04 Osteotech, Inc. Bone-derived implant for load-supporting applications
US6294041B1 (en) * 1998-02-06 2001-09-25 Osteotech, Inc. Method for an osteoimplant manufacture
US6432710B1 (en) * 1998-05-22 2002-08-13 Isolagen Technologies, Inc. Compositions for regenerating tissue that has deteriorated, and methods for using such compositions
US6630001B2 (en) * 1998-06-24 2003-10-07 International Heart Institute Of Montana Foundation Compliant dehyrated tissue for implantation and process of making the same
US6277555B1 (en) * 1998-06-24 2001-08-21 The International Heart Institute Of Montana Foundation Compliant dehydrated tissue for implantation and process of making the same
US20010004715A1 (en) * 1998-06-24 2001-06-21 Carlos M. G. Duran Compliant dehydrated tissue for implantation and process of making the same
US6293970B1 (en) * 1998-06-30 2001-09-25 Lifenet Plasticized bone and soft tissue grafts and methods of making and using same
US20030135284A1 (en) * 1998-06-30 2003-07-17 Katrina Crouch Plasticized bone grafts and methods of making and using same
US6569200B2 (en) * 1998-06-30 2003-05-27 Lifenet Plasticized soft tissue grafts, and methods of making and using same
US20030217415A1 (en) * 1998-06-30 2003-11-27 Katrina Crouch Plasticized bone grafts and methods of making and using same
US6544289B2 (en) * 1998-06-30 2003-04-08 Lifenet Plasticized bone grafts, and methods of making and using same
US6448076B2 (en) * 1998-09-15 2002-09-10 The Regents Of The University Of Michigan Method for chemically acellularizing a biological tissue sample
US6200347B1 (en) * 1999-01-05 2001-03-13 Lifenet Composite bone graft, method of making and using same
US6734018B2 (en) * 1999-06-07 2004-05-11 Lifenet Process for decellularizing soft-tissue engineered medical implants, and decellularized soft-tissue medical implants produced
US20030087428A1 (en) * 1999-06-07 2003-05-08 Lloyd Wolfinbarger Process for decellularizing soft-tissue engineered medical implants, and decellularized soft-tissue medical implants produced
US6162258A (en) * 1999-08-25 2000-12-19 Osteotech, Inc. Lyophilized monolithic bone implant and method for treating bone
US6312474B1 (en) * 1999-09-15 2001-11-06 Bio-Vascular, Inc. Resorbable implant materials
US6352708B1 (en) * 1999-10-14 2002-03-05 The International Heart Institute Of Montana Foundation Solution and method for treating autologous tissue for implant operation
US6432712B1 (en) * 1999-11-22 2002-08-13 Bioscience Consultants, Llc Transplantable recellularized and reendothelialized vascular tissue graft
US6416995B1 (en) * 1999-11-22 2002-07-09 Bio Science Consultants, L.L.C. Bioreactor mediated recellularization of natural and tissue engineered vascular grafts
US6479064B1 (en) * 1999-12-29 2002-11-12 Children's Medical Center Corporation Culturing different cell populations on a decellularized natural biostructure for organ reconstruction
US6428802B1 (en) * 1999-12-29 2002-08-06 Children's Medical Center Corp. Preparing artificial organs by forming polylayers of different cell populations on a substrate
US6376244B1 (en) * 1999-12-29 2002-04-23 Children's Medical Center Corporation Methods and compositions for organ decellularization
US6743574B1 (en) * 2000-09-12 2004-06-01 Lifenet Process for devitalizing soft-tissue engineered medical implants, and devitalized soft-tissue medical implants produced
US6783556B1 (en) * 2000-09-26 2004-08-31 Shlomo Gabbay System and method for making a calotte-shaped implantable sheath
US6455818B1 (en) * 2001-08-23 2002-09-24 Maytag Corporation Downdraft filter assembly for a cooking appliance
US20040057936A1 (en) * 2002-09-23 2004-03-25 Cheung David T. Method to treat collagenous connective tissue for implant remodeled by host cells into living tissue

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100030340A1 (en) * 1998-06-30 2010-02-04 Wolfinbarger Jr Lloyd Plasticized Grafts and Methods of Making and Using Same
US9585986B2 (en) 1998-06-30 2017-03-07 Lifenet Health Plasticized bone and soft tissue grafts and methods of making and using same
US20030135284A1 (en) * 1998-06-30 2003-07-17 Katrina Crouch Plasticized bone grafts and methods of making and using same
US20030217415A1 (en) * 1998-06-30 2003-11-27 Katrina Crouch Plasticized bone grafts and methods of making and using same
US9579420B2 (en) 1998-06-30 2017-02-28 Lifenet Health Plasticized bone and soft tissue grafts and methods of making and using same
US20050246035A1 (en) * 1998-06-30 2005-11-03 Wolfinbarger Lloyd Jr Plasticized bone and soft tissue grafts and methods of making and using same
US7063726B2 (en) 1998-06-30 2006-06-20 Lifenet Plasticized bone grafts and methods of making and using same
US9125971B2 (en) 1998-06-30 2015-09-08 Lifenet Health Plasticized bone and soft tissue grafts and methods of making and using same
US20110015757A1 (en) * 1998-06-30 2011-01-20 Lifenet Health Plasticized Bone and Soft Tissue Grafts and Methods of Making and Using Same
US7001551B2 (en) * 2000-07-13 2006-02-21 Allograft Research Technologies, Inc. Method of forming a composite bone material implant
US20030036800A1 (en) * 2000-07-13 2003-02-20 Meredith Thomas L. Composite bone material implant and method
US8563232B2 (en) 2000-09-12 2013-10-22 Lifenet Health Process for devitalizing soft-tissue engineered medical implants, and devitalized soft-tissue medical implants produced
US20030100948A1 (en) * 2000-11-24 2003-05-29 Swabey Ogilvy Renault Connective tissue substitutes, method of preparation and uses thereof
US7347872B2 (en) 2000-11-24 2008-03-25 Universite De Montreal Connective tissue substitutes, method of preparation and uses thereof
US7335230B2 (en) 2000-11-24 2008-02-26 Universite De Montreal Connective tissue substitutes, method of preparation and uses thereof
US20040067249A1 (en) * 2000-11-24 2004-04-08 Universite Laval Connective tissue substitutes, method of preparation and uses thereof
US20070005138A9 (en) * 2000-11-24 2007-01-04 Swabey Ogilvy Renault Connective tissue substitutes, method of preparation and uses thereof
US8007992B2 (en) 2006-10-27 2011-08-30 Edwards Lifesciences Corporation Method of treating glutaraldehyde-fixed pericardial tissue with a non-aqueous mixture of glycerol and a C1-C3 alcohol
US20080102439A1 (en) * 2006-10-27 2008-05-01 Bin Tian Biological tissue for surgical implantation
US9744043B2 (en) 2007-07-16 2017-08-29 Lifenet Health Crafting of cartilage
US8512342B2 (en) 2007-08-11 2013-08-20 Thomas L. Meredith Portable bone grinder
US20090157082A1 (en) * 2007-08-11 2009-06-18 Meredith Thomas L Portable Bone Grinder
US9539080B2 (en) 2010-03-05 2017-01-10 Edwards Lifesciences Corporation Dry prosthetic heart valve packaging system
US20110214398A1 (en) * 2010-03-05 2011-09-08 Edwards Lifesciences Corporation Dry Prosthetic Heart Valve Packaging System
US8679404B2 (en) 2010-03-05 2014-03-25 Edwards Lifesciences Corporation Dry prosthetic heart valve packaging system
US9498317B2 (en) 2010-12-16 2016-11-22 Edwards Lifesciences Corporation Prosthetic heart valve delivery systems and packaging

Also Published As

Publication number Publication date Type
US20010034556A1 (en) 2001-10-25 application
US20140180437A1 (en) 2014-06-26 application
US20110015757A1 (en) 2011-01-20 application
US6293970B1 (en) 2001-09-25 grant
US6544289B2 (en) 2003-04-08 grant
US20050246035A1 (en) 2005-11-03 application
US20130218294A1 (en) 2013-08-22 application
US6569200B2 (en) 2003-05-27 grant
US9579420B2 (en) 2017-02-28 grant
US20020120345A1 (en) 2002-08-29 application
US9125971B2 (en) 2015-09-08 grant
US9585986B2 (en) 2017-03-07 grant

Similar Documents

Publication Publication Date Title
Eppley et al. Allograft and alloplastic bone substitutes: a review of science and technology for the craniomaxillofacial surgeon
Gazdag et al. Alternatives to autogenous bone graft: efficacy and indications
US5554389A (en) Urinary bladder submucosa derived tissue graft
US4678470A (en) Bone-grafting material
US7067123B2 (en) Glue for cartilage repair
Stevenson Biology of bone grafts
US5993844A (en) Chemical treatment, without detergents or enzymes, of tissue to form an acellular, collagenous matrix
US6110206A (en) Anterior cruciate ligament xenografts
Masquelet et al. The concept of induced membrane for reconstruction of long bone defects
US20030032961A1 (en) Devices from naturally occurring biologically derived materials
US4654464A (en) Bone substitute material on the base of natural bones
US6083522A (en) Devices for tissue repair and methods for preparation and use thereof
US20080305145A1 (en) Process for demineralization of bone matrix with preservation of natural growth factors
Liao et al. Lumbar spinal fusion with a mineralized collagen matrix and rhBMP-2 in a rabbit model
US20050101957A1 (en) Soft and calcified tissue implants
EP0495284A1 (en) Osteogenic composition and implant containing same
US6458375B1 (en) Malleable paste with allograft bone reinforcement for filling bone defects
US5507813A (en) Shaped materials derived from elongate bone particles
Anderson et al. Critical size defect in the goat's os ilium: A model to evaluate bone grafts and substitutes
US20070185585A1 (en) Implant Scaffold Combined With Autologous Tissue, Allogenic Tissue, Cultured Tissue, or combinations Thereof
US20070299517A1 (en) Articular cartilage implant
US5439684A (en) Shaped, swollen demineralized bone and its use in bone repair
US20060216321A1 (en) Solvent based processing technologies for making tissue/polymer composites
US20070248638A1 (en) Structurally modified acellular tissue engineering scaffolds and methods of production
US20040037735A1 (en) Allograft tissue purification process for cleaning bone

Legal Events

Date Code Title Description
AS Assignment

Owner name: LIFENET HEALTH, VIRGINIA

Free format text: CHANGE OF NAME;ASSIGNOR:LIFENET;REEL/FRAME:020166/0991

Effective date: 20070307

Owner name: LIFENET HEALTH,VIRGINIA

Free format text: CHANGE OF NAME;ASSIGNOR:LIFENET;REEL/FRAME:020166/0991

Effective date: 20070307

AS Assignment

Owner name: LIFENET HEALTH, VIRGINIA

Free format text: CHANGE OF NAME;ASSIGNOR:LIFENET;REEL/FRAME:020288/0872

Effective date: 20070307

Owner name: LIFENET HEALTH,VIRGINIA

Free format text: CHANGE OF NAME;ASSIGNOR:LIFENET;REEL/FRAME:020288/0872

Effective date: 20070307

AS Assignment

Owner name: LIFENET HEALTH, VIRGINIA

Free format text: CORRECTIVE COVER SHEET TO CORRECT PATENT APPLICATION NUMBERS D471,971 29/148,528 ON ASSIGNMENT PREVIOUSLY RECORDED AT REEL 020288 FRAME 0872.;ASSIGNOR:LIFENET;REEL/FRAME:020462/0781

Effective date: 20070307

Owner name: LIFENET HEALTH,VIRGINIA

Free format text: CORRECTIVE COVER SHEET TO CORRECT PATENT APPLICATION NUMBERS D471,971 29/148,528 ON ASSIGNMENT PREVIOUSLY RECORDED AT REEL 020288 FRAME 0872;ASSIGNOR:LIFENET;REEL/FRAME:020462/0781

Effective date: 20070307

Owner name: LIFENET HEALTH, VIRGINIA

Free format text: CORRECTIVE COVER SHEET TO CORRECT PATENT APPLICATION NUMBERS D471,971 29/148,528 ON ASSIGNMENT PREVIOUSLY RECORDED AT REEL 020288 FRAME 0872;ASSIGNOR:LIFENET;REEL/FRAME:020462/0781

Effective date: 20070307