Patents by Inventor Shulin He
Shulin He 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: 9951190Abstract: 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: GrantFiled: July 22, 2015Date of Patent: April 24, 2018Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau
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Patent number: 9828474Abstract: 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: GrantFiled: September 11, 2015Date of Patent: November 28, 2017Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau
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Publication number: 20150376349Abstract: 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: ApplicationFiled: September 11, 2015Publication date: December 31, 2015Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau
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Publication number: 20150322239Abstract: 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: ApplicationFiled: July 22, 2015Publication date: November 12, 2015Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau
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Patent number: 9132209Abstract: 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: GrantFiled: May 7, 2010Date of Patent: September 15, 2015Assignee: Howmedia Osteonics Corp.Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau
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Patent number: 8439975Abstract: 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 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: GrantFiled: September 20, 2012Date of Patent: May 14, 2013Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
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Patent number: 8415406Abstract: A bone cement has a liquid acrylic monomer component, a powdered acrylic polymer component and yellowish beta-carotene (Pro-vitamin A) mixed into one of the liquid or powdered component and FDC blue No. 2 Lake powder mixed into the powdered component. The beta-carotene and FDC blue adds a greenish (yellow plus blue) color to the combined liquid and powdered component. The yellowish color disappears on setting of the bone cement leaving the cement blue.Type: GrantFiled: January 16, 2007Date of Patent: April 9, 2013Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Matthew P. Poggie
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Patent number: 8303657Abstract: 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: GrantFiled: May 25, 2011Date of Patent: November 6, 2012Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
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Patent number: 8241564Abstract: 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 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: GrantFiled: February 17, 2012Date of Patent: August 14, 2012Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
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Publication number: 20120187607Abstract: 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 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: ApplicationFiled: February 17, 2012Publication date: July 26, 2012Applicant: Howmedica Osteonics Corp.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
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Patent number: 8133436Abstract: 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: GrantFiled: August 5, 2008Date of Patent: March 13, 2012Assignee: Howmedica Osteonics Corp.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
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Publication number: 20110276143Abstract: 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: ApplicationFiled: May 7, 2010Publication date: November 10, 2011Applicant: HOWMEDICA OSTEONICS CORP.Inventors: Shulin He, Zongtao Zhang, Keenan Michael Hanson, Shi-Shen Yau, Daniel E. Lawrynowicz, Aiguo Wang
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Publication number: 20110224325Abstract: 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: ApplicationFiled: May 25, 2011Publication date: September 15, 2011Applicant: HOWMEDICA OSTEONICS CORP.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang, Daniel E. Lawrynowicz
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Publication number: 20100036491Abstract: 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: ApplicationFiled: August 5, 2008Publication date: February 11, 2010Applicant: Howmedica Osteonics Corp.Inventors: Shulin He, Shi-Shen Yau, Aiguo Wang
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Publication number: 20070213425Abstract: An acrylic bone cement composition, including a liquid monomer component and a polymer powder component in the form of beads. The liquid monomer component includes a methylmethacrylate polymer and the polymer component includes a polymethylmethacrylate polymer powder, wherein the polymer powder component is subjected to a milling process.Type: ApplicationFiled: March 8, 2006Publication date: September 13, 2007Applicant: Howmedica Osteonics Corp.Inventors: Paul Higham, Shulin He
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Publication number: 20070117878Abstract: A bone cement has a liquid acrylic monomer component, a powdered acrylic polymer component and yellowish beta-carotene (Pro-vitamin A) mixed into one of the liquid or powdered component and FDC blue No. 2 Lake powder mixed into the powdered component. The beta-carotene and FDC blue adds a greenish (yellow plus blue) color to the combined liquid and powdered component. The yellowish color disappears on setting of the bone cement leaving the cement blue.Type: ApplicationFiled: January 16, 2007Publication date: May 24, 2007Inventors: Shulin He, Matthew Poggie
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Publication number: 20070021526Abstract: A bone cement has a liquid acrylic monomer component, a powdered acrylic polymer component and beta-carotene (Pro-vitamin A) mixed into one of the liquid or powdered components. The beta-carotene adds a yellowish color to the combined liquid and powdered component. The color disappears on setting of the bone cement.Type: ApplicationFiled: July 22, 2005Publication date: January 25, 2007Applicant: Howmedica Osteonics Corp.Inventors: Shulin He, Paul Higham
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Patent number: 6759485Abstract: A network consisting essentially of poly(propylene fumarate) cross linked with diacrylate and a method for making same.Type: GrantFiled: April 22, 2002Date of Patent: July 6, 2004Assignee: William Marsh Rice UniversityInventors: Shulin He, Michael J. Yaszemski, Antonios G. Mikos
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Publication number: 20020177668Abstract: A network consisting essentially of poly(propylene fumarate) cross linked with diacrylate and a method for making same.Type: ApplicationFiled: April 22, 2002Publication date: November 28, 2002Applicant: William Marsh Rice UniversityInventors: Shulin He, Michael J. Yaszemski, Antonios G. Mikos
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Patent number: 6423790Abstract: A network consisting essentially of poly(propylene fumarate) cross linked with diacrylate and a method for making same.Type: GrantFiled: April 14, 2000Date of Patent: July 23, 2002Assignee: William Marsh Rice UniversityInventors: Shulin He, Michael J. Yaszemski, Antonios G. Mikos