Aiguo J Wang

US Patent:

6436137, Aug 20, 2002

Filed:

Jul 19, 2001

Appl. No.:

09/909156

Inventors:

Aiguo Wang - Wood-Ridge NJ
Aaron Essner - Bloomingdale NJ

Assignee:

Howmedica Osteonics Corp. - Allendale NJ

International Classification:

A61F 202

US Classification:

623 1111, 623 1611, 623 1711, 623 1717, 623 1811, 623 2011, 623 2014, 623 2111, 623 2112, 623 2115, 623 2211, 623 2358, 525191, 525240

Abstract:

Methods and compositions for fabricating prosthetic medical devices exhibiting improved wear resistance include selectively cross-linking polymeric resins then curing and shaping the polymer into a finished article. The 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.

US Patent:

6566451, May 20, 2003

Filed:

May 1, 2002

Appl. No.:

10/137050

Inventors:

Aiguo Wang - Wayne NJ
Aaron Essner - Bloomingdale NJ

Assignee:

Howmedica Osteonics Corp. - Allendale NJ

International Classification:

B29B 1308

US Classification:

525191, 525240

Abstract:

Methods for fabricating prosthetic medical devices exhibiting improved wear resistance include selectively cross-linking polymeric resins then curing and shaping the polymer into a finished article. 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.

US Patent:

6638311, Oct 28, 2003

Filed:

Nov 5, 2001

Appl. No.:

10/008287

Inventors:

Aiguo Wang - Wayne NJ
Eric Jones - Limerick, IE
Casper F. Stark - Pompton Lakes NJ
John H. Dumbleton - Ridgewood NJ
Ruey Lin - Concord CA

Assignee:

Benoist Girard SAS

International Classification:

A61F 232

US Classification:

623 2232, 623 2211

Abstract:

According to the present invention a prosthetic bearing component is formed from a composite synthetic plastics material comprising an injection molded thermoplastic polymeric matrix reinforced by a pitch based carbon fiber and having a bearing surface which has been machined with a surface roughness with a value less than R 2 m. Such components have shown superior wear qualities. Preferably the bearing surface shape is machined with tolerances of 0. 1 to 0. 15 mm. The composite material must be capable of withstanding a radiation value of at least 2. 8 Mega Rads (MRad). In components in which the bearing surface is substantially or part spherical a sphericity of 0. 3 m within a solid angle of 45Â is required.

US Patent:

6818171, Nov 16, 2004

Filed:

Mar 11, 2002

Appl. No.:

10/095240

Inventors:

Aiguo Wang - Wood-Ridge NJ
Aaron Paul Essner - Bloomingdale NJ
Alfred J. Zarnowski - North Plainfield NJ

Assignee:

Howmedica Osteonics Corp. - Mahwah NJ

International Classification:

H05B 600

US Classification:

264478, 264485, 264488, 264494

Abstract:

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.

US Patent:

6849224, Feb 1, 2005

Filed:

Mar 11, 2002

Appl. No.:

10/094789

Inventors:

Aiguo Wang - Wood-Ridge NJ, US
Aaron Paul Essner - Bloomingdale NJ, US
Alfred J. Zarnowski - North Plainfield NJ, US

Assignee:

Howmedica Osteonics Corp. - Mahwah NJ

International Classification:

B29C 7104

US Classification:

264478, 264485, 264488, 264494

Abstract:

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.

US Patent:

6905511, Jun 14, 2005

Filed:

Mar 5, 2003

Appl. No.:

10/379642

Inventors:

Aiguo Wang - Wayne NJ, US
Aaron Essner - Bloomingdale NJ, US

Assignee:

Howmedica Oseonics Corp. - Mahwah NJ

International Classification:

A61F002/02
A61F002/28
A61F002/30
A61F002/44

US Classification:

623 1111, 623 1312, 623 1611, 623 1811, 623 1911, 623 2014, 623 2115, 623 2112, 623 2211, 522109, 522110, 522111, 522112, 522157, 522161, 522150, 522 74, 525191, 525240

Abstract:

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.

US Patent:

7186362, Mar 6, 2007

Filed:

Feb 25, 2005

Appl. No.:

11/067139

Inventors:

Aiguo Wang - Wayne NJ, US
Aaron Essner - Bloomingdale NJ, US

Assignee:

Howmedica Osteonics Corp. - Mahwah NJ

International Classification:

A61F 2/02
A61F 2/28
A61F 2/30
A61F 2/44

US Classification:

26417128, 623 1312, 623 1611, 623 1811, 623 1911, 623 2014, 623 2115, 623 2112, 623 2211, 623 1111, 522109, 522110, 522111, 522112, 522157, 522161, 522150, 522 74, 525191, 525240, 264464, 26421112, 26421124, 26417112, 26417123, 26417126

Abstract:

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.

US Patent:

7517919, Apr 14, 2009

Filed:

Oct 4, 2004

Appl. No.:

10/957782

Inventors:

Aiguo Wang - Wayne NJ, US
John H. Dumbleton - Ridgewood NJ, US
Aaron Essner - Bloomingdale NJ, US
Shi-Shen Yau - Berkeley Heights NJ, US

Assignee:

Howmedica Osteonics Corp. - Mahwah NJ

International Classification:

C08J 3/28

US Classification:

522161, 623 2358

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. When applied to a preform, such as a rod, the annealing of the bulk polymer part of the rod from which the finished part is made must take place on the rod before the implant is machined therefrom and exposed to oxygen.