Patents by Inventor Aaron Essner
Aaron Essner 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: 10828168Abstract: A prosthetic knee implant system includes a prosthetic femoral component and a prosthetic tibial component. The femoral component includes a lateral condyle, a medial condyle, a bone-contacting surface that may be formed of porous metal, and an articular surface that may be formed of PAEK/PEEK. The tibial component includes medial and lateral condylar portions, a bone-contacting surface that may be formed of porous metal, and a second surface opposite the bone-contacting surface. Recesses extend a depth into the second surfaces of the medial and lateral condylar portions. Medial and lateral bearing inserts with flat proximal faces are positioned with the recesses of the medial and lateral condylar portions. Flexible medial and lateral meniscal components are positioned to surround the medial and lateral inserts, respectively, and extend proximal to the second surface of the insert.Type: GrantFiled: May 4, 2018Date of Patent: November 10, 2020Assignee: Howmedica Osteonics Corp.Inventors: Scott G. Logan, Aaron Essner
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Publication number: 20180325683Abstract: A prosthetic knee implant system includes a prosthetic femoral component and a prosthetic tibial component. The femoral component includes a lateral condyle, a medial condyle, a bone-contacting surface that may be formed of porous metal, and an articular surface that may be formed of PAEK/PEEK. The tibial component includes medial and lateral condylar portions, a bone-contacting surface that may be formed of porous metal, and a second surface opposite the bone-contacting surface. Recesses extend a depth into the second surfaces of the medial and lateral condylar portions. Medial and lateral bearing inserts with flat proximal faces are positioned with the recesses of the medial and lateral condylar portions. Flexible medial and lateral meniscal components are positioned to surround the medial and lateral inserts, respectively, and extend proximal to the second surface of the insert.Type: ApplicationFiled: May 4, 2018Publication date: November 15, 2018Inventors: Scott G. Logan, Aaron Essner
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Patent number: 9650476Abstract: 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: GrantFiled: October 6, 2015Date of Patent: May 16, 2017Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 9445902Abstract: One embodiment of the implant comprises a porous metal bone ingrowth portion (14) having a first side connected to a high density or solid (fully dense) metal portion (16) which in turn has an opposite side connected to a porous metal soft tissue ingrowth portion (12) thus forming a sandwich structure with the high density or fully dense portion in the middle. The implant may be made of a resorbable material such as an alloy of magnesium. Alternately, the alloy can be selected from the group consisting of calcium, iron, yttrium and lithium. The porous metal soft tissue ingrowth portion (12) has porosity characteristics allowing cartilage to interdigitate with the pores and extend outwardly beyond the platform of the metal surface towards a joint capsule. The solid or fully dense intermediate layer 16 may have some porosity, however that porosity prevents either bone tissue or cartilage tissue from migrating therethrough.Type: GrantFiled: October 20, 2010Date of Patent: September 20, 2016Assignee: Howmedica Osteonics Corp.Inventors: Robert W. Klein, Aaron Essner, Anthony P. Napolitano
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Publication number: 20160024261Abstract: 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: ApplicationFiled: October 6, 2015Publication date: January 28, 2016Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 9181409Abstract: 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: GrantFiled: February 6, 2014Date of Patent: November 10, 2015Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Publication number: 20140194548Abstract: 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: ApplicationFiled: February 6, 2014Publication date: July 10, 2014Applicant: HOWMEDICA OSTEONICS CORP.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 8680173Abstract: 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: GrantFiled: October 23, 2012Date of Patent: March 25, 2014Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 8324291Abstract: 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: GrantFiled: September 1, 2011Date of Patent: December 4, 2012Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Publication number: 20120253474Abstract: One embodiment of the implant comprises a porous metal bone ingrowth portion (14) having a first side connected to a high density or solid (fully dense) metal portion (16) which in turn has an opposite side connected to a porous metal soft tissue ingrowth portion (12) thus forming a sandwich structure with the high density or fully dense portion in the middle. The implant may be made of a resorbable material such as an alloy of magnesium. Alternately, the alloy can be selected from the group consisting of calcium, iron, yttrium and lithium. The porous metal soft tissue ingrowth portion (12) has porosity characteristics allowing cartilage to interdigitate with the pores and extend outwardly beyond the platform of the metal surface towards a joint capsule. The solid or fully dense intermediate layer 16 may have some porosity, however that porosity prevents either bone tissue or cartilage tissue from migrating therethrough.Type: ApplicationFiled: October 20, 2010Publication date: October 4, 2012Applicant: HOWMEDICA OSTEONICS CORP.Inventors: Robert W. Klein, Aaron Essner, Anthony P. Napolitano
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Publication number: 20120029160Abstract: 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: ApplicationFiled: September 1, 2011Publication date: February 2, 2012Applicant: HOWMEDICA OSTEONICS CORP.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 8030370Abstract: 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: GrantFiled: April 9, 2010Date of Patent: October 4, 2011Assignee: How medica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Publication number: 20100197881Abstract: 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: ApplicationFiled: April 9, 2010Publication date: August 5, 2010Applicant: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 7714036Abstract: 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: GrantFiled: December 9, 2008Date of Patent: May 11, 2010Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Publication number: 20090105439Abstract: 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: ApplicationFiled: December 9, 2008Publication date: April 23, 2009Applicant: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 7517919Abstract: 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: GrantFiled: October 4, 2004Date of Patent: April 14, 2009Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, John H. Dumbleton, Aaron Essner, Shi-Shen Yau
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Patent number: 7186362Abstract: A prosthetic medical device exhibiting improved wear resistance is fabricated by sealing at least one polyolefinic material in an airtight container and providing an inert atmosphere within the airtight container. The polyolefinic material is exposed to an irradiation source to yield a cross-linked irradiated polyolefinic material. At least one non-irradiated polyolefinic material is blended with the irradiated polyolefinic material, and the prosthetic medical device is formed from the blended material. Selectively cross-linked polymeric compositions may be created by blending a specific amount of cross-linked resins with a specific amount of uncross-linked resins then cured into a polymeric matrix whereby the desired degree or percentage of overall cross-linking is obtained. The polymeric material may then be formed directly into a finished article by injection molding the polymeric material.Type: GrantFiled: February 25, 2005Date of Patent: March 6, 2007Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, Aaron Essner
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Publication number: 20050167893Abstract: A prosthetic medical device exhibiting improved wear resistance is fabricated by sealing at least one polyolefinic material in an airtight container and providing an inert atmosphere within the airtight container. The polyolefinic material is exposed to an irradiation source to yield a cross-linked irradiated polyolefinic material. At least one non-irradiated polyolefinic material is blended with the irradiated polyolefinic material, and the prosthetic medical device is formed from the blended material. Selectively cross-linked polymeric compositions may be created by blending a specific amount of cross-linked resins with a specific amount of uncross-linked resins then cured into a polymeric matrix whereby the desired degree or percentage of overall cross-linking is obtained. The polymeric material may then be formed directly into a finished article by injection molding the polymeric material.Type: ApplicationFiled: February 25, 2005Publication date: August 4, 2005Applicant: Howmedica Osteonics Corp.Inventors: Aiguo Wang, Aaron Essner
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Patent number: 6905511Abstract: A prosthetic medical device exhibiting improved wear resistance is fabricated by irradiating at least one polyolefinic material in the presence of an inert atmosphere to yield a cross-linked irradiated polyolefinic material; blending at least one non-irradiated polyolefinic material with the at least one irradiated polyolefinic material, and forming the prosthetic medical device from the blended material. Selectively cross-linked polymeric compositions may be created by blending a specific amount of cross-linked resins with a specific amount of uncross-linked resins then cured into a polymeric matrix whereby the desired degree or percentage of overall cross-linking is obtained. The polymeric material may then be formed directly into a finished article by injection molding the polymeric material.Type: GrantFiled: March 5, 2003Date of Patent: June 14, 2005Assignee: Howmedica Oseonics Corp.Inventors: Aiguo Wang, Aaron Essner
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Publication number: 20050113935Abstract: An improved prosthetic medical device having improved wear resistance and toughness is provided in the present application. A method is provided to selectively cross-link the polymeric matrix comprising the medical device by employing an interrupting means such as a mask, wire mesh or chopper wheel placed in between the medical device and irradiation source. In addition, the medical device may be translated while being irradiated to further effect the selective cross-linking. The present invention also provides for an injection molding process wherein a prosthetic medical device is formed in a single step, then selectively cross-linked.Type: ApplicationFiled: August 30, 2004Publication date: May 26, 2005Applicant: Howmedica Osteonics Corp.Inventors: Aiguo Wang, Aaron Essner, Alfred Zarnowski