Patents by Inventor Aiguo Wang

Aiguo Wang 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).

  • Publication number: 20120067853
    Abstract: A method of manufacturing an orthopaedic implant device having a porous outer surface is described. In one embodiment, the implant device includes a porous layer, an intermediate layer, and a solid substrate. The porous layer is preferably bonded to the intermediate layer by cold isostatic pressing. The intermediate layer is preferably bonded by vacuum welding to the solid substrate such that the porous layer forms at least a portion of the outer surface of the orthopaedic implant device. Preferably, a diffusion bond is created between the bonded intermediate layer and the solid substrate by hot isostatic pressing. In another embodiment, a porous layer is created on an outer surface of a solid layer by selective melting. Preferably, the solid layer is bonded to the solid substrate such that the porous layer forms at least a portion of the outer surface of the orthopaedic implant device.
    Type: Application
    Filed: September 16, 2010
    Publication date: March 22, 2012
    Applicant: HOWMEDICA OSTEONICS CORP.
    Inventors: Aiguo Wang, Daniel E. Lawrynowicz, Haitong Zeng, Naomi Murray, Balaji Prabhu
  • Patent number: 8133436
    Abstract: A method for manufacturing of ultrahigh molecular weight polyethylene (UHMWPE) for implants, where the implants have been machined out of UHMWPE blocks or extruded rods, has anthocyanin dispersely imbedded in the polyethylene. The implant is then exposed to ? ray or electron beam irradiation in an amount of at least 2.5 Mrad followed by a heat treatment to prevent the implant from becoming brittle in the long term as well as to improve strength and wear. The method includes mixing a powder or granulate resin of UHMWPE with an aqueous liquid that contains anthocyanin in a predetermined amount. The water is then evaporated in order to deposit the anthocyanin in a predetermined concentration on the polyethylene particles. The doped UHMWPE particles are compressed into blocks at temperatures in a range of approximately 135° C.-250° C. and pressures in a range of approximately 2-70 MPa. Medical implants are made from the blocks.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: March 13, 2012
    Assignee: Howmedica Osteonics Corp.
    Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
  • Publication number: 20120029160
    Abstract: A method of producing an improved polyethylene, especially an ultra-high molecular weight polyethylene utilizes a sequential irradiation and annealing process to form a highly cross-linked polyethylene material. The use of sequential irradiation followed by sequential annealing after each irradiation allows each dose of irradiation in the series of doses to be relatively low while achieving a total dose which is sufficiently high to cross-link the material. The process may either be applied to a preformed material such as a rod or bar or sheet made from polyethylene resin or may be applied to a finished polyethylene part.
    Type: Application
    Filed: September 1, 2011
    Publication date: February 2, 2012
    Applicant: HOWMEDICA OSTEONICS CORP.
    Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
  • Patent number: 8057914
    Abstract: A method of fabricating a medical implant component. The method may comprise producing a substrate from a first material in which the substrate has a bearing portion, and causing particles of a second material to be formed onto at least the bearing portion of the substrate. The second material may be formed from a biocompatible material and a carbide source, in which the carbide source is 6.17% or more of the second material by weight. The particles of the second material may be formed onto at least the bearing portion of the substrate by a predetermined spraying technique, a CVD process, a PVD process, or a carburization process. The biocompatible material may be cobalt chrome and the carbide source may be graphite.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: November 15, 2011
    Assignee: Howmedica Osteonics Corp.
    Inventors: Daniel E. Lawrynowicz, Aiguo Wang, Zongtao Zhang
  • Publication number: 20110276143
    Abstract: A method for producing a wear resistant polyethylene medical implant includes forming a medical implant, such as an orthopedic implant, made at least partially of ultra high molecular weight polyethylene (UHMWPE). The polyethylene may be irradiated with gamma ray or e-beam radiation to form free radicals and then crosslinked to eliminate free radicals prior to exposure to oxygen. The so treated bearing surface of the crosslinked polyethylene is then coated with a photoinitiator. Thereafter the bearing material is photocrosslinked with ultra-violet (UV) radiation. The photocrosslinking process can also be applied to non-crosslink UHMWPE.
    Type: Application
    Filed: May 7, 2010
    Publication date: November 10, 2011
    Applicant: HOWMEDICA OSTEONICS CORP.
    Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau, Daniel E. Lawrynowicz, Aiguo Wang
  • Patent number: 8030370
    Abstract: A method of producing an improved polyethylene, especially an ultra-high molecular weight polyethylene utilizes a sequential irradiation and annealing process to form a highly cross-linked polyethylene material. The use of sequential irradiation followed by sequential annealing after each irradiation allows each dose of irradiation in the series of doses to be relatively low while achieving a total dose which is sufficiently high to cross-link the material. The process may either be applied to a preformed material such as a rod or bar or sheet made from polyethylene resin or may be applied to a finished polyethylene part. If applied to a finished polyethylene part, the irradiation and annealing must be accomplished with the polyethylene material not in contact with oxygen at a concentration greater than 1% oxygen volume by volume.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: October 4, 2011
    Assignee: How medica Osteonics Corp.
    Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
  • Publication number: 20110224325
    Abstract: A method for manufacturing of ultrahigh molecular weight polyethylene (UHMWPE) for implants, where the implants have been machined out of UHMWPE blocks or extruded rods, has anthocyanin dispersely imbedded in the polyethylene. The implant is then exposed to ? ray or electron beam irradiation in an amount of at least 2.5 Mrad followed by a heat treatment to prevent the implant from becoming brittle in the long term as well as to improve strength and wear. The method includes mixing a powder or granulate resin of UHMWPE with an aqueous liquid that contains anthocyanin in a predetermined amount. The water is then evaporated in order to deposit the anthocyanin in a predetermined concentration on the polyethylene particles. The doped UHMWPE particles are compressed into blocks at temperatures in a range of approximately 135° C.-250° C. and pressures in a range of approximately 2-70 MPa. Medical implants are made from the blocks.
    Type: Application
    Filed: May 25, 2011
    Publication date: September 15, 2011
    Applicant: HOWMEDICA OSTEONICS CORP.
    Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
  • Patent number: 7981479
    Abstract: A system and method for use in applying a coating of a desired material onto one or more medical implant components. The system may include one or more thermal sprayers and a rotatable holding fixture having a plurality of mounting stations each operable to hold at least one medical implant component. The fixture may be operable to rotate about a central axis and each mounting station may be operable to rotate about a respective mounting station axis. The fixture may be arranged adjacent to one or more thermal sprayers so that during operation one or more desired materials may be sprayed by the one or more thermal sprayers upon an outer surface of each of the medical implant components while the fixture rotates about the central axis and while simultaneously therewith each of mounting stations having a respective medical implant component rotates about the respective mounting station axis.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: July 19, 2011
    Assignees: Howmedica Osteonics Corp., Inframat Corporation
    Inventors: Daniel E. Lawrynowicz, Aiguo Wang, Zongtao Zhang, Jay Krajewski
  • Publication number: 20100312348
    Abstract: An orthopedic prosthetic joint comprising a joint couple having a first bearing surface made of a poly aryl ether ketone (PAEK) and a second joint component having a second bearing made of a polymer that is softer than the PAEK such as UHMWPE the first and second bearing surfaces in sliding engagement with one another.
    Type: Application
    Filed: June 3, 2010
    Publication date: December 9, 2010
    Applicant: HOWMEDICA OSTEONICS CORP.
    Inventors: Aiguo Wang, Zongtao Zhang, Daniel E. Lawrynowicz, Shi-Shen Yau
  • Patent number: 7836847
    Abstract: A system and method for use in applying a coating of a desired material onto one or more medical implant components. The system may include a thermal sprayer and a rotatable holding fixture having a plurality of mounting stations each operable to hold at least one medical implant component. The fixture may be operable to rotate about a central axis and each mounting station may be operable to rotate about a respective mounting station axis. The fixture may be arranged adjacent to the thermal sprayer so that during operation the desired material may be sprayed by the thermal sprayer upon an outer surface of each of the medical implant components while the fixture rotates about the central axis and while simultaneously therewith each of mounting stations having a respective medical implant component rotates about the respective mounting station axis.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: November 23, 2010
    Assignees: Howmedica Osteonics Corp., Inframat Corporation
    Inventors: Daniel Lawrynowicz, Aiguo Wang, Zongtao Zhang, Jay Krajewski
  • Publication number: 20100266780
    Abstract: A system and method for use in applying a coating of a desired material onto one or more medical implant components. The system may include one or more thermal sprayers and a rotatable holding fixture having a plurality of mounting stations each operable to hold at least one medical implant component. The fixture may be operable to rotate about a central axis and each mounting station may be operable to rotate about a respective mounting station axis. The fixture may be arranged adjacent to one or more thermal sprayers so that during operation one or more desired materials may be sprayed by the one or more thermal sprayers upon an outer surface of each of the medical implant components while the fixture rotates about the central axis and while simultaneously therewith each of mounting stations having a respective medical implant component rotates about the respective mounting station axis.
    Type: Application
    Filed: May 24, 2010
    Publication date: October 21, 2010
    Applicants: Howmedica Osteonics Corp., Inframat Corporation
    Inventors: Daniel E. Lawrynowicz, Aiguo Wang, Zongtao Zhang, Jay Krajewski
  • Patent number: 7771775
    Abstract: A method of fabricating a medical implant component. The method may comprise producing a substrate from a first material in which the substrate has a bearing portion, and spraying particles of a second material by use of a thermal type spraying process onto at least the bearing portion of the substrate. The second material may be formed from a biocompatible material and a carbide source, in which the carbide source is 6.17% or more of the second material by weight. The biocompatible material may be cobalt chrome and the carbide source may be graphite. The thermal type spraying process may be a plasma spraying process or a high velocity oxygen fuel spraying process.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: August 10, 2010
    Assignee: Howmedica Osteonics Corp.
    Inventors: Daniel E. Lawrynowicz, Aiguo Wang, Zongtao Zhang
  • Publication number: 20100197881
    Abstract: A method of producing an improved polyethylene, especially an ultra-high molecular weight polyethylene utilizes a sequential irradiation and annealing process to form a highly cross-linked polyethylene material. The use of sequential irradiation followed by sequential annealing after each irradiation allows each dose of irradiation in the series of doses to be relatively low while achieving a total dose which is sufficiently high to cross-link the material. The process may either be applied to a preformed material such as a rod or bar or sheet made from polyethylene resin or may be applied to a finished polyethylene part. If applied to a finished polyethylene part, the irradiation and annealing must be accomplished with the polyethylene material not in contact with oxygen at a concentration greater than 1% oxygen volume by volume.
    Type: Application
    Filed: April 9, 2010
    Publication date: August 5, 2010
    Applicant: Howmedica Osteonics Corp.
    Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
  • Publication number: 20100121458
    Abstract: A hip resurfacing femoral prosthesis has a partial ball component having an outer surface shaped to conform to an acetabular socket and has a mating sleeve component with an internal bore adapted to receive a femoral head. The head has been shaped and dimensioned to engage the bore and is retained by bone ingrowth, an interference fit or by bone cement. The ball component and sleeve axes may be offset to reposition the outer surface.
    Type: Application
    Filed: November 18, 2009
    Publication date: May 13, 2010
    Applicant: HOWMEDICA OSTEONICS CORP.
    Inventors: Robert E. Ledger, Peter Tulkis, Aiguo Wang, Damon Servidio
  • Patent number: 7714036
    Abstract: A method of producing an improved polyethylene, especially an ultra-high molecular weight polyethylene utilizes a sequential irradiation and annealing process to form a highly cross-linked polyethylene material. The use of sequential irradiation followed by sequential annealing after each irradiation allows each dose of irradiation in the series of doses to be relatively low while achieving a total dose which is sufficiently high to cross-link the material. The process may either be applied to a preformed material such as a rod or bar or sheet made from polyethylene resin or may be applied to a finished polyethylene part. If applied to a finished polyethylene part, the irradiation and annealing must be accomplished with the polyethylene material not in contact with oxygen at a concentration greater than 1% oxygen volume by volume.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: May 11, 2010
    Assignee: Howmedica Osteonics Corp.
    Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
  • Publication number: 20100036491
    Abstract: A method for manufacturing of ultrahigh molecular weight polyethylene (UHMWPE) for implants, where the implants have been machined out of UHMWPE blocks or extruded rods, has anthocyanin dispersely imbedded in the polyethylene. The implant is then exposed to ? ray or electron beam irradiation in an amount of at least 2.5 Mrad followed by a heat treatment to prevent the implant from becoming brittle in the long term as well as to improve strength and wear. The method includes mixing a powder or granulate resin of UHMWPE with an aqueous liquid that contains anthocyanin in a predetermined amount. The water is then evaporated in order to deposit the anthocyanin in a predetermined concentration on the polyethylene particles. The doped UHMWPE particles are compressed into blocks at temperatures in a range of approximately 135° C.-250° C. and pressures in a range of approximately 2-70 MPa. Medical implants are made from the blocks.
    Type: Application
    Filed: August 5, 2008
    Publication date: February 11, 2010
    Applicant: Howmedica Osteonics Corp.
    Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang
  • Publication number: 20090324442
    Abstract: A method of fabricating a material having a high concentration of a carbide constituent. The method may comprise adding a carbide source to a biocompatible material in which a weight of the carbide source is at least approximately 10% of the total weight, heating the carbide source and the biocompatible material to a predetermined temperature to melt the biocompatible material and allow the carbide source to go into solution to form a molten homogeneous solution, and impinging the molten homogeneous solution with a high pressure fluid to form spray atomized powder having carbide particles. The size of a particle of carbide in the atomized powder may be approximately 900 nanometers or less. The biocompatible material may be cobalt chrome, the carbide source may be graphite, and the fluid may be a gas or a liquid.
    Type: Application
    Filed: March 26, 2007
    Publication date: December 31, 2009
    Applicant: Howmedica Osteonics Corp.
    Inventors: Daniel E. Lawrynowicz, Aiguo Wang, Zongtao Zhang, Haitong Zeng
  • Patent number: 7578851
    Abstract: An implantable medical device includes a porous metal foam or foam-like structure having pores defined by metal struts or webs wherein the porous structure has directionally controlled pore characteristics. The pore characteristics controlled include one or more of the metal structure porosity, pore size, pore shape, pore size distribution and strut thickness. The pore characteristics may vary in one or more directions throughout the structure. Preferably the pore characteristics are controlled to match the porous metal structure to various mechanical and biological requirements of different regions of the structure in order to optimize aspects of the implants performance and may vary not only over the surface of the porous structure but through the depth of the porous structure. The thickness of the porous metal structure may also be modified to establish a thickness profile that optimizes mechanical and biological requirements of the implants performance.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: August 25, 2009
    Assignee: Howmedica Osteonics Corp.
    Inventors: Nicholas Nai Guang Dong, Aiguo Wang, Eric Jones, Gregory E. Plaskon
  • Publication number: 20090139962
    Abstract: A method and system are provided for controlling the accumulation of electrical charge during a semiconductor plasma etching process performed in a plasma etching chamber. The bias voltage supplied to the plasma etching chamber is modulated by a bias power modulation circuit to control the accumulation of electrical charge and to force the accumulated electrical charge to be periodically discharged at a controlled rate of discharge that prevents the wafer from being damaged.
    Type: Application
    Filed: November 29, 2007
    Publication date: June 4, 2009
    Inventors: Edward Aiguo Wang, Nace Rossi
  • Publication number: 20090105439
    Abstract: A method of producing an improved polyethylene, especially an ultra-high molecular weight polyethylene utilizes a sequential irradiation and annealing process to form a highly cross-linked polyethylene material. The use of sequential irradiation followed by sequential annealing after each irradiation allows each dose of irradiation in the series of doses to be relatively low while achieving a total dose which is sufficiently high to cross-link the material. The process may either be applied to a preformed material such as a rod or bar or sheet made from polyethylene resin or may be applied to a finished polyethylene part. If applied to a finished polyethylene part, the irradiation and annealing must be accomplished with the polyethylene material not in contact with oxygen at a concentration greater than 1% oxygen volume by volume.
    Type: Application
    Filed: December 9, 2008
    Publication date: April 23, 2009
    Applicant: Howmedica Osteonics Corp.
    Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau