Patents by Inventor David S. Hungerford
David S. Hungerford has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6886568Abstract: Disclosed is a method of growing cells on biodegradable microcarrier particles and more specifically growing chondrocytes for an extended period of time until they aggregate. These aggregated cells can be injected directly or shaped for implantation into the body. In another embodiment of this invention, the cell microcarrier aggregates are grown in a mold that is shaped to conform to the geometry of the desired body part to be replaced. An apparatus for shaping the aggregated cells is disclosed. The aggregated cells can be supplied in a kit.Type: GrantFiled: April 4, 2001Date of Patent: May 3, 2005Assignees: The Johns Hopkins University, Chrondros, Inc.Inventors: Carmelita G. Frondoza, David J. Fink, David S. Hungerford, Alan H. Shikani
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Publication number: 20040117033Abstract: This invention is a method for the implantation of a combination of cells or cell-microcarrier aggregates wherein one component comprises a solid implantable construct and a second component comprises an injectable formulation. For example, in one embodiment, the solid implant may be first implanted to fill the majority of the cavity receiving the implant, and then cells or cell-microcarrier aggregates in an injectable format, with or without the addition of gelling materials to promote rapid gelling in situ, may be injected into spaces surrounding the solid implant in order to secure the solid implant in the site and/or to promote rapid adherence and/or integration of the solid implant to surrounding tissues. Also contemplated in this embodiment is that the cellular composition of the injectable component may differ from that of the solid component.Type: ApplicationFiled: December 9, 2003Publication date: June 17, 2004Inventors: Carmelita G. Frondoza, David S. Hungerford, Alan H. Shikani, Abraham J. Domb, David J. Fink, Leonard Bloom
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Publication number: 20040044408Abstract: The invention is directed to the culture of cells, and particularly chondrocytes for purpose of tissue replacement. The cells are cultured on polymer constructs. Integren expression is used as a measure of chondrocyte viability. Chondrocytes are obtained from the knee, nose and ankle cartilage. Mechanical strain is used to propagate chondrocytes, chitosan and arabinogalactan-chitosan are used as scaffolds. Progenitor, pluripotential, stem and mesenchymal cells are operative in this invention.Type: ApplicationFiled: September 3, 2003Publication date: March 4, 2004Inventors: David S. Hungerford, Carmelita G. Frondoza, Alan H. Shikani, Abraham J. Domb
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Patent number: 6662805Abstract: This invention is a method for the implantation of a combination of cells or cell-microcarrier aggregates wherein one component comprises a solid implantable construct and a second component comprises an injectable formulation. For example, in one embodiment, the solid implant may be first implanted to fill the majority of the cavity receiving the implant, and then cells or cell-microcarrier aggregates in an injectable format, with or without the addition of gelling materials to promote rapid gelling in situ, may be injected into spaces surrounding the solid implant in order to secure the solid implant in the site and/or to promote rapid adherence and/or integration of the solid implant to surrounding tissues. Also contemplated in this embodiment is that the cellular composition of the injectable component may differ from that of the solid component.Type: GrantFiled: August 6, 2001Date of Patent: December 16, 2003Assignees: The Johns Hopkins University, Chondros, Inc.Inventors: Carmelita G. Frondoza, David S. Hungerford, Alan H. Shikani, Abraham J. Domb, David J. Fink, Leonard Bloom
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Patent number: 6637437Abstract: The invention is directed to the culture of cells, and particularly chondrocytes for purpose of tissue replacement. The cells are cultured on polymer constructs. Integren expression is used as a measure of chondrocyte viability. Chondrocytes are obtained from the knee, nose and ankle cartilage. Mechanical strain is used to propagate chondrocytes, chitosan and arabinogalactanchitosan are used as scaffolds. Progenitor, pluripotential, stem and mesenchymal cells are operative in this invention.Type: GrantFiled: November 14, 2000Date of Patent: October 28, 2003Assignees: Johns Hopkins University, Chondros, Inc.Inventors: David S. Hungerford, Carmelita G. Frondoza, Alan H. Shikani, Abraham J. Domb
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Patent number: 6530927Abstract: The present invention includes an apparatus and method for cutting a bone including a cutting assembly having a cutting blade, a cutting guide for guiding the shape of the cut in the bone, and a power source for powering the cutting blade. The cutting blade is moveable radially to vary the depth of the cut in the bone, and the cutting blade is capable of cutting around the circumference of the bone as well as in a longitudinal direction along the bone. A powered bone breaking device for completing the breaking of the weakened bone is also disclosed. A miniaturized version of the bone cutting apparatus can be used to cut out sections of a femur head from inside a femur body.Type: GrantFiled: February 16, 2001Date of Patent: March 11, 2003Assignee: Volunteers for Medical EngineeringInventors: John H. Staehlin, David S. Hungerford, Dror Paley, Charles Bartish, John Garmon, Dana Mcpherson
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Patent number: 6488686Abstract: The present invention includes an apparatus and method for cutting a bone including a cutting assembly having a cutting blade, a cutting guide for guiding the shape of the cut in the bone, and a power source for powering the cutting blade. The cutting blade is moveable radially to vary the depth of the cut in the bone, and the cutting blade is capable of cutting around the circumference of the bone as well as in a longitudinal direction along the bone. A powered bone breaking device for completing the breaking of the weakened bone is also disclosed. A miniaturized version of the bone cutting apparatus can be used to cut out sections of a femur head from inside a femur body.Type: GrantFiled: February 16, 2001Date of Patent: December 3, 2002Assignee: Volunteers for Medical EngineeringInventors: John H. Staehlin, David S. Hungerford
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Publication number: 20020133235Abstract: Cells grown on a microcarrier are separated from the microcarrier by enzymatically digesting the microcarrier. More specifically, chondrocytes may be grown on dextran microcarrier beadlets and then the beadlets digested using dextranase to separate the chondrocytes from the carrier. Cells can also be grown on chitosan microcarriers to be used for implantation. In addition, cells can be grown on polysaccharide polymers to be used as implant devices. Various polymers serve as scaffolds for cells to be used for implantation. The polymers can be used for cell culture as well as for preparing scaffolds useful for tissue replacement such as cartilage tissue.Type: ApplicationFiled: February 4, 2002Publication date: September 19, 2002Inventors: David S. Hungerford, Carmelita G. Frondoza, Afshin Sohrobi, Alan H. Shikani, Abraham J. Domb
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Publication number: 20020123142Abstract: Cells grown on a microcarrier are separated from the microcarrier by enzymatically digesting the microcarrier. More specifically, chondrocytes may be grown on dextran microcarrier beadlets and then the beadlets digested using dextranase to separate the chondrocytes from the carrier. Cells can also be grown on chitosan microcarriers to be used for implantation. In addition, cells can be grown on polysaccharide polymers to be used as implant devices. Various polymers serve as scaffolds for cells to be used for implantation. The polymers can be used for cell culture as well as for preparing scaffolds useful for tissue replacement such as cartilage tissue.Type: ApplicationFiled: January 3, 2002Publication date: September 5, 2002Inventors: David S. Hungerford, Carmelita G. Frondoza, Afshin Sohrabi, Alan H. Shikani, Abraham J. Domb
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Patent number: 6378527Abstract: Cells grown on a microcarrier are separated from the microcarrier by enzymatically digesting the microcarrier. More specifically, chondrocytes may be grown on dextran microcarrier beadlets and then the beadlets digested using dextranase to separate the chondrocytes from the carrier. Cells can also be grown on chitosan microcarriers to be used for implantation. In addition, cells can be grown on polysaccharide polymers to be used as implant devices. Various polymers serve as scaffolds for cells to be used for implantation. The polymers can be used for cell culture as well as for preparing scaffolds useful for tissue replacement such as cartilage tissue.Type: GrantFiled: March 24, 1999Date of Patent: April 30, 2002Assignee: Chondros, Inc.Inventors: David S. Hungerford, Carmelita G. Frondoza, Afshin Sohrabi, Alan H. Shikani, Abraham J. Domb
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Publication number: 20010051834Abstract: This invention is a method for the implantation of a combination of cells or cell-microcarrier aggregates wherein one component comprises a solid implantable construct and a second component comprises an injectable formulation. For example, in one embodiment, the solid implant may be first implanted to fill the majority of the cavity receiving the implant, and then cells or cell-microcarrier aggregates in an injectable format, with or without the addition of gelling materials to promote rapid gelling in situ, may be injected into spaces surrounding the solid implant in order to secure the solid implant in the site and/or to promote rapid adherence and/or integration of the solid implant to surrounding tissues. Also contemplated in this embodiment is that the cellular composition of the injectable component may differ from that of the solid component.Type: ApplicationFiled: August 6, 2001Publication date: December 13, 2001Applicant: Chondros, Inc.Inventors: Carmelita G. Frondoza, David S. Hungerford, Alan H. Shikani, Abraham J. Domb, David J. Fink, Leonard Bloom
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Patent number: 6309394Abstract: The present invention includes an apparatus and method for cutting a bone including a cutting assembly having a cutting blade, a cutting guide for guiding the shape of the cut in the bone, and a power source for powering the cutting blade. The cutting blade is moveable radially to vary the depth of the cut in the bone, and the cutting blade is capable of cutting around the circumference of the bone as well as in a longitudinal direction along the bone. A powered bone breaking device for completing the breaking of the weakened bone is also disclosed. A miniaturized version of the bone cutting apparatus can be used to cut out sections of a femur head from inside a femur body.Type: GrantFiled: August 20, 1999Date of Patent: October 30, 2001Assignee: Volunteers for Medical EngineeringInventors: John H. Staehlin, David S. Hungerford, Dror Paley, Charles Bartish, John Garmon, Dana Mcpherson
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Publication number: 20010034525Abstract: The present invention includes an apparatus and method for cutting a bone including a cutting assembly having a cutting blade, a cutting guide for guiding the shape of the cut in the bone, and a power source for powering the cutting blade. The cutting blade is moveable radially to vary the depth of the cut in the bone, and the cutting blade is capable of cutting around the circumference of the bone as well as in a longitudinal direction along the bone. A powered bone breaking device for completing the breaking of the weakened bone is also disclosed. A miniaturized version of the bone cutting apparatus can be used to cut out sections of a femur head from inside a femur body.Type: ApplicationFiled: February 16, 2001Publication date: October 25, 2001Applicant: Volunteers for Medical EngineeringInventors: John H. Staehlin, David S. Hungerford, Dror Paley, Charles Bartish, John Garmon, Dana McPherson
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Publication number: 20010034533Abstract: The present invention includes an apparatus and method for cutting a bone including a cutting assembly having a cutting blade, a cutting guide for guiding the shape of the cut in the bone, and a power source for powering the cutting blade. The cutting blade is moveable radially to vary the depth of the cut in the bone, and the cutting blade is capable of cutting around the circumference of the bone as well as in a longitudinal direction along the bone. A powered bone breaking device for completing the breaking of the weakened bone is also disclosed. A miniaturized version of the bone cutting apparatus can be used to cut out sections of a femur head from inside a femur body.Type: ApplicationFiled: February 16, 2001Publication date: October 25, 2001Applicant: Volunteers for Medical EngineeringInventors: John H. Staehlin, David S. Hungerford, Dror Paley, Charles Bartish, John Garmon, Dana McPherson
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Publication number: 20010014475Abstract: Disclosed is a method of growing cells on biodegradable microcarrier particles and more specifically growing chondrocytes for an extended period of time until they aggregate. These aggregated cells can be injected directly or shaped for implantation into the body. In another embodiment of this invention, the cell microcarrier aggregates are grown in a mold that is shaped to conform to the geometry of the desired body part to be replaced. An apparatus for shaping the aggregated cells is disclosed. The aggregated cells can be supplied in a kit.Type: ApplicationFiled: April 4, 2001Publication date: August 16, 2001Inventors: Carmelita G. Frondoza, David J. Fink, David S. Hungerford, Alan H. Shikani
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Patent number: 5358534Abstract: A femoral component for a hip prosthesis has a distal portion defining a central longitudinal axis. The component has a generally conically shaped mid-shaft portion and a proximal portion with a shape based on the reamer and a shaped chisel used by the surgeon to prepare the proximal metaphysis and medullary canal. The proximal portion is shaped in a manner wherein a cross-section taken perpendicular to the central axis has a medial side formed as a first circular arc, a corner of the cross-section formed by the posterior and lateral sides as a second circular arc with a center on the central axis. The posterior side is arcuate and concave and tangent to the first and second circular arcs, with the anterior side being arcuate and convex.Type: GrantFiled: April 29, 1993Date of Patent: October 25, 1994Assignee: Howmedica Inc.Inventors: Michael W. Dudasik, Anthony K. Hedley, David S. Hungerford, Matthew P. Poggie
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Patent number: 4653488Abstract: A prosthetic knee is implanted after cutting the femor and tibia in the proper manner with the aid of instruments which include axial alignment guides and a series of cutting jigs.Type: GrantFiled: November 19, 1985Date of Patent: March 31, 1987Assignee: Howmedica, Inc.Inventors: Robert V. Kenna, David S. Hungerford, Kenneth A. Krackow
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Patent number: 4646729Abstract: A prosthetic knee is implanted after cutting the femor and tibia in the proper manner with the aid of instruments which include axial alignment guides and a series of cutting jigs.Type: GrantFiled: December 19, 1985Date of Patent: March 3, 1987Assignee: Howmedica, Inc.Inventors: Robert V. Kenna, David S. Hungerford, Kenneth A. Krackow