Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Extrusion molding
Reexamination Certificate
2004-10-13
2008-03-18
Berman, Susan (Department: 1711)
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Extrusion molding
C522S161000, C264S323000, C264S331170
Reexamination Certificate
active
07344672
ABSTRACT:
Solid-state deformation processing of crosslinked high molecular weight polymers such as UHMWPE, for example by extrusion below the melt transition, produces materials with a combination of high tensile strength and high oxidative stability. The materials are especially suitable for use as bearing components in artificial hip and other implants. Treated bulk materials are anisotropic, with enhanced strength oriented along the axial direction. The material is oxidatively stable even after four weeks of accelerated aging in a pressure vessel containing five atmospheres of oxygen (ASTM F2003). Because of its oxidative stability, the deformation processed material is a suitable candidate for air-permeable packaging and gas sterilization, which has thus far been reserved for remelted crosslinked UHMWPE.
REFERENCES:
patent: 2948666 (1960-08-01), Lawton
patent: 3362897 (1968-01-01), Lawton
patent: 3563870 (1971-02-01), Tung et al.
patent: 3886056 (1975-05-01), Kitamaru et al.
patent: 3956253 (1976-05-01), Braun
patent: 4055862 (1977-11-01), Farling
patent: 4171338 (1979-10-01), Mason
patent: 4224696 (1980-09-01), Murray et al.
patent: 4281420 (1981-08-01), Raab
patent: 4348350 (1982-09-01), Meier et al.
patent: 4390666 (1983-06-01), Moriguchi et al.
patent: 4582656 (1986-04-01), Hoffmann
patent: 4586995 (1986-05-01), Randall et al.
patent: 4587163 (1986-05-01), Zachariades
patent: 4636340 (1987-01-01), Itaba et al.
patent: 4655769 (1987-04-01), Zachariades
patent: 4668577 (1987-05-01), Ohta et al.
patent: 4747990 (1988-05-01), Gaussens et al.
patent: 4778633 (1988-10-01), Kiang et al.
patent: 4902460 (1990-02-01), Yagi et al.
patent: 5030402 (1991-07-01), Zachariades
patent: 5030487 (1991-07-01), Rosenzweig
patent: 5037928 (1991-08-01), Li et al.
patent: 5066755 (1991-11-01), Lemstra
patent: 5130376 (1992-07-01), Shih
patent: 5160464 (1992-11-01), Ward et al.
patent: 5200439 (1993-04-01), Asanuma
patent: 5204045 (1993-04-01), Courval et al.
patent: 5210130 (1993-05-01), Howard, Jr.
patent: 5234652 (1993-08-01), Woodhams et al.
patent: 5276079 (1994-01-01), Duan et al.
patent: 5358529 (1994-10-01), Davidson
patent: 5405393 (1995-04-01), Falkenström
patent: 5414049 (1995-05-01), Sun et al.
patent: 5428079 (1995-06-01), Bastiaansen et al.
patent: 5439949 (1995-08-01), Lucas et al.
patent: 5449745 (1995-09-01), Sun et al.
patent: 5466530 (1995-11-01), England et al.
patent: 5478906 (1995-12-01), Howard, Jr.
patent: 5505900 (1996-04-01), Suwanda et al.
patent: 5508319 (1996-04-01), DeNicola, Jr. et al.
patent: 5543471 (1996-08-01), Sun et al.
patent: 5552104 (1996-09-01), DeNicola, Jr. et al.
patent: 5577368 (1996-11-01), Hamilton et al.
patent: 5650485 (1997-07-01), Sun et al.
patent: 5684124 (1997-11-01), Howard, Jr. et al.
patent: 5709020 (1998-01-01), Pienkowski et al.
patent: 5728748 (1998-03-01), Sun et al.
patent: 5824411 (1998-10-01), Shalaby et al.
patent: 5879400 (1999-03-01), Merrill et al.
patent: 6017975 (2000-01-01), Saum et al.
patent: 6048480 (2000-04-01), Doyle
patent: 6143232 (2000-11-01), Rohr
patent: 6146426 (2000-11-01), Doyle
patent: 6165220 (2000-12-01), McKellop et al.
patent: 6168626 (2001-01-01), Hyon et al.
patent: 6174934 (2001-01-01), Sun et al.
patent: 6184265 (2001-02-01), Hamilton et al.
patent: 6228900 (2001-05-01), Shen et al.
patent: 6242507 (2001-06-01), Saum et al.
patent: 6245276 (2001-06-01), McNulty et al.
patent: 6281264 (2001-08-01), Salovey et al.
patent: 6316158 (2001-11-01), Saum et al.
patent: 6355215 (2002-03-01), Poggie et al.
patent: 6365089 (2002-04-01), Krebs et al.
patent: 6372814 (2002-04-01), Sun et al.
patent: 6395799 (2002-05-01), Johnson
patent: 6432349 (2002-08-01), Pletcher et al.
patent: 6458727 (2002-10-01), Jones et al.
patent: 6464926 (2002-10-01), Merrill et al.
patent: 6494917 (2002-12-01), McKellop et al.
patent: 6503439 (2003-01-01), Burstein
patent: 6547828 (2003-04-01), Scott et al.
patent: 6562540 (2003-05-01), Saum et al.
patent: 6641617 (2003-11-01), Merrill et al.
patent: 6664308 (2003-12-01), Sun et al.
patent: 6686437 (2004-02-01), Buchman et al.
patent: 6692679 (2004-02-01), McNulty et al.
patent: 6709464 (2004-03-01), Scott et al.
patent: 6786933 (2004-09-01), Merrill et al.
patent: 6800670 (2004-10-01), Shen et al.
patent: 6818020 (2004-11-01), Sun et al.
patent: 6818172 (2004-11-01), King et al.
patent: 6852772 (2005-02-01), Muratoglu et al.
patent: 6905511 (2005-06-01), Wang et al.
patent: 2001/0049401 (2001-12-01), Salovey et al.
patent: 2002/0007219 (2002-01-01), Merrill et al.
patent: 2002/0156536 (2002-10-01), Harris et al.
patent: 2003/0013781 (2003-01-01), Merrill et al.
patent: 2003/0045603 (2003-03-01), Salovey et al.
patent: 2003/0105182 (2003-06-01), Merrill et al.
patent: 2003/0119935 (2003-06-01), Merrill et al.
patent: 2003/0125513 (2003-07-01), King
patent: 2003/0137081 (2003-07-01), Pitkanen
patent: 2003/0139555 (2003-07-01), Hubbard et al.
patent: 2003/0158287 (2003-08-01), Salovey et al.
patent: 2003/0208278 (2003-11-01), Richard
patent: 2003/0212161 (2003-11-01), McKellop et al.
patent: 2003/0229155 (2003-12-01), Wang et al.
patent: 2004/0132856 (2004-07-01), Merrill et al.
patent: 2004/0208841 (2004-10-01), Salovey et al.
patent: 2004/0266902 (2004-12-01), Shen et al.
patent: 2005/0006821 (2005-01-01), Merrill et al.
patent: 2005/0010288 (2005-01-01), Merrill et al.
patent: 2005/0043431 (2005-02-01), Wang et al.
patent: 2005/0043815 (2005-02-01), King et al.
patent: 2005/0048096 (2005-03-01), Shen et al.
patent: 2005/0056971 (2005-03-01), Merrill et al.
patent: 2005/0059750 (2005-03-01), Sun et al.
patent: 2005/0069696 (2005-03-01), King et al.
patent: 2005/0096749 (2005-05-01), Merrill et al.
patent: 1 257 745 (1989-07-01), None
patent: 0 729 981 (2002-03-01), None
patent: 57-211347 (1982-12-01), None
patent: 62-243634 (1987-10-01), None
patent: 02-175137 (1990-07-01), None
patent: 04-198201 (1992-07-01), None
patent: 05-507748 (1993-11-01), None
patent: 91 022222 (1997-05-01), None
patent: WO 93/10953 (1993-06-01), None
patent: WO 95/06148 (1995-03-01), None
patent: WO 98/01085 (1998-01-01), None
patent: WO 98/14223 (1998-04-01), None
patent: WO 03/049930 (2003-06-01), None
Crugnola et al., Ultrahigh Molecular Weight Polyethylene as Used in Articular Prostheses (A Molecular Weight Distribution Study), J. of App. Polymer Science, vol. 20, (1976) pp. 809-812.
Ellis et al., The Use of Ultrahigh Molecular Weight Polyethylene in Articular Prosthesis—II. Effects of Fabrication and Gamma Sterilization on Polymer Characteristics, Coatings and Plastics Preprints, vol. 37, No. 2, American Chemical Society, (1977) pp. 280-284.
Greenwald et al., New Polys for Old: Contribution or Caveat?, American Academy of Orthopaedic Surgeons, 69th Annual Meeting (Feb. 13-17, 2002) (6 pages).
Howmedica, Material Properties, Product Quality Control, and Their Relation to UHMWPE Performance, Part Two of a Series on Ultra-High Molecular Weight Polyethylene, (1994) pp. 1-20.
Howmedica, Overview and Fundamentals of UHMWPE, Part One of a Series on Ultra-High Molecular Weight Polyethylene, (1994) pp. 1-8.
Jones et al., Effect of γ Irradiation on the Friction and Wear of Ultrahigh Molecular weight Polyethylene, Wear, vol. 70, (1981) pp. 77-92.
Kashiwabara et al., Radiation-Induced Oxidation of Plastics, Radiation Processing of Polymers, Chapter 11, (1992) pp. 221-254.
Kurtz et al., Comparison of the Properties of Annealed Crosslinked (Crossfire™) and Conventional Polyethylene as Hip Bearing Materials, Bulletin—Hospital for Joint Diseases, vol. 61, Nos. 1 & 2, (2002-2003) pp. 17-26.
Narkis et al., Structure and Tensile Behavior of Irradiation—and Peroxide—Crosslinked Polyethylenes, J. Macromol. Sci.—Phys., vol. B 26, No. 1, (1987) pp. 37-58.
Nusbaum et al. The Effects of Radiation Sterilization on the Properties of Ultrahigh Molecular Weight Polyethylene, Journal of Biomedical Materials Research, vol. 13, (1979) pp. 557-576.
Silverman, Radiation-Induced and Chemical Crosslinking: A Brief Comparison, Radiation Processing of Polymers, Chap. 2, (1992) p. 15-22.
Sultan
Freedman Jordan H.
Gunter James E.
Hawkins H. Gene
Salyer Brian D.
Schroeder David W.
Berman Susan
Biomet Manufacturing Corp.
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