Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Injection molding
Reexamination Certificate
2005-02-01
2005-02-01
Vargot, Mathieu D. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Injection molding
C264S485000, C264S488000, C264S494000
Reexamination Certificate
active
06849224
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.
REFERENCES:
patent: 2904480 (1959-09-01), Rainer et al.
patent: 3022543 (1962-02-01), Baird, Jr. et al.
patent: 3057791 (1962-10-01), Anderson, Jr.
patent: 3090770 (1963-05-01), Gregorian
patent: 3162623 (1964-12-01), Cairns
patent: 3297641 (1967-01-01), Werber et al.
patent: 3330748 (1967-07-01), Lawton
patent: 3352818 (1967-11-01), Meyer et al.
patent: 3563869 (1971-02-01), Rainer et al.
patent: 3616365 (1971-10-01), Stastny
patent: 3758273 (1973-09-01), Johnston et al.
patent: 3832827 (1974-09-01), Lemelson
patent: 3886056 (1975-05-01), Kitamaru et al.
patent: 4226905 (1980-10-01), Harbourne
patent: 4587163 (1986-05-01), Zachariades
patent: 4655769 (1987-04-01), Zachariades
patent: 4701288 (1987-10-01), Cook et al.
patent: 4813210 (1989-03-01), Masuda et al.
patent: 4820466 (1989-04-01), Zachariades
patent: 4832965 (1989-05-01), Helin
patent: 4950151 (1990-08-01), Zachariades
patent: 5030402 (1991-07-01), Zachariades
patent: 5037928 (1991-08-01), Li et al.
patent: 5096654 (1992-03-01), Craggs et al.
patent: 5153039 (1992-10-01), Porter et al.
patent: 5160464 (1992-11-01), Ward et al.
patent: 5160677 (1992-11-01), Gravener et al.
patent: 5222949 (1993-06-01), Kaldany
patent: 5414049 (1995-05-01), Sun et al.
patent: 5508319 (1996-04-01), DeNicola, Jr. et al.
patent: 5728510 (1998-03-01), White
patent: 5814423 (1998-09-01), Maruyama et al.
patent: 5879400 (1999-03-01), Merrill et al.
patent: 6017975 (2000-01-01), Saum et al.
patent: 6090527 (2000-07-01), Yamazaki et al.
patent: 6165220 (2000-12-01), McKellop et al.
patent: 6365089 (2002-04-01), Krebs et al.
patent: 6372256 (2002-04-01), Jamiolkowski et al.
patent: 0218003 (1987-04-01), None
patent: 0376503 (1990-07-01), None
patent: 0177552 (1992-05-01), None
patent: 0 729 981 (1996-09-01), None
patent: 1 065 034 (2001-01-01), None
patent: 1 072 275 (2001-01-01), None
patent: 2060469 (1983-09-01), None
patent: 2180815 (1987-04-01), None
patent: 2156733 (1987-10-01), None
patent: 2157298 (1987-11-01), None
patent: 2225551 (1990-06-01), None
patent: 2207436 (1991-07-01), None
patent: 59-71830 (1984-04-01), None
patent: 9011060 (1990-11-01), None
B. Ranby, et al., Photodegradation, Photo-Oxidation and Photostabilization of Polymers, Principles and Applications, pp 60-71.
Robert M. Streicher, “Investigation on Sterilization and Modification of High Molecular Weight Polyethylenes by Ionizing Irradiation”,Reprint from beta-gamma 1/89, beta-gamma 1/89, pp. 34-43.
Robert M. Streicher, “Ionizing irradiation for sterilization and modification of high molecular weight polyethylenes*”,Plastics and Rubber Processing and Applications, vol. 10, No. 4, 1988, pp. 221-229.
R.M. Streicher, “Influence of Ionizing Irradiation in Air and Nitrogen for Sterilization of Surgical Grade Polyethylene for Implants”,Radiat. Phys. Chem., vol. 31, Nos. 4-6, pp. 693-698, 1988.
R.M. Streicher, Change in Properties of High Molecular Weight Polyethylenes After Ionizing Irradiation for Sterilization and Modification,Radiation processing for plastics and rubber III, Department of Medical Engineering, Sulzer Brothers Ltd., Winterthur, Switzerland.
R.M. Streicher, “Improving UHMWPE By Ionizing Irradiation Crosslinking During Sterilization”, Sulzermedica, Department of Medical Engineering, Winterthur, Switzerland, 17thAnnual Meeting of the Society of Biomaterials, May 1-5, 1991.
D.J. Dijkstra et al., Cross-linking of ultra-high molecular weight polyethylene in the melt by means of electron beam irradiation,Polymer, 1989, vol. 30, May, pp. 866-770.
R.M. Streicher, “The Behavior of UHMW-PE when Subjected to Sterilization by Ionizing Radiation”,Ultra high molecular weight polyethylene as biomaterial in orthopedic surgery, pp. 66-73,1991.
H.Y. Kang, et al., “The Radiation Chemistry of Polyethylene. IX. Temperature Coefficient of Cross-Linking and Other Effects1”,Journal of the American Chemical Society/89.9/Apr. 26, 1967, pp. 1980-1986.
Masaru Matsuo, et al., “Cross-Linking of Ultrahigh Molecular Weight Polyethylene Films Produced by Gelation/Crystallization form Solution under Elongation Process”,Macromolecules, vol. 19, No. 7, Jul. 1986, pp. 2028-2035.
D.J. Dijkstra, et al. “Cross-linking of porous gel-spun ultra-high molecular weight polyethylene by means of electron beam irradiation”, Polymer Bulletin, vol. 20, pp. 557-582, (1988).
D.J. Dijkstra, et al. “Cross-linking of porous gel-spun ultra-high strength polyethylene fibers by means of electron beam irradiation”,Polymer Bulletin, vol. 17, pp. 507-513, (1987).
W.G. Perkins, et al., “Effect of Gamma Radiation and Annealing on Ultra-Oriented Polyethylene”,Polymer Engineering and Science, Mid-May, 1978, vol. 18, No. 6, pp. 527-532.
Junkichi Sohma, “Radical Migration as an Elementary Process in Degradation”, vol. 55, No. 10, pp. 1595-1601, 1983.
D.A. Blackadder, et al., “Properties of polymer crystal aggregates. (2) Annealing of polyethylene crystal aggregates”, pp. 147-164, 1969.
Akeharu Tsuruta et al., “Annealing of Ultra-Oriented High Density Polyethylene Extrudates”,Polymer Engineering and Science, Jun. 1983, vol. 23, No. 9, pp. 521-529.
C. Sawatari, et al., “Temperature-dependence of mechanical and morphological properties of ultra-high molecular weight polyethylene cross-linked by electron beam irradiation”,Colloid&Polymer Science, vol. 226, No. 4 (1988), pp. 316-323.
M. Narkis, et al., “Structure and Tensile Behavior of Irradiation- and Peroxide- Crosslinked Polyethylenes”,Journal of Macromolecular Science—Physics, vol. B26, No. 1, 1987, pp. 37-58.
Harold Schonhorn, et al., “Surface Crosslinking of Polyethylene and Adhesive Joint Strength”,Journal of Applied Polymer Science, vol. 18, pp. 235-243 (1974).
L. Minkova, et al., Blends of normal high density and ultra-high molecular weight polyethylene, γ irradiated a at a low dose,ColloidPolymer Science, vol. 268, No. 11, pp. 1018-1023 (1990).
C.T. Lue, et al., “Approaching the Properties of UHMW-PE by Crosslinking Low Molecular Weight HDPE”,ANTEC '84, pp. 538-541 (1984).
M.S. Jahan, et al., “Combined Chemical and Mechanical Effects on Free Radicals in UHMWPE Joints During Implantation”,Journal of Biochemical Materials Research, vol. 25, pp. 1005-1017, (1991).
Patel, et al., “Crystallinity and the Effect of Ionizing Radiation in Polyethylene. I. Crosslinking and Crystal Core; II. Crosslinking in Chain-Folded Single Crystals; III. An Experiment on the Irradiation-Inducted Crosslinking in n-Hexatriacontane”,Journal of Polymer Science: Polymer Physics Edition, vol. 13, pp. 303-338, (1975).
Yoshihiro Sakai, et al., Effect of electron beam irradiation on simultaneously biaxially drawn ultra-high molecular weight polyethylene dried gel films,POLYMER, 1993, vol. 34, No. 16, pp. 3362-3345.
Francis Cracco, et al., “ESR Studied of Free Radical Decay in Irradiated Polyethylene”,The Journal of Chemical Physics, vol. 37, No. 10, Nov. 15, 1962, pp. 2449-2457.
C.J. Grobbelaar, et al., “The Radiation Improvement of Polyethylene Prostheses”,The Journal of Bone and Joint Surgery, vol. 60-B, No. 3, Aug. 1978, pp. 370-374.
A. Charlesby, “The effects of ionising radiation on polymers”,Irradiation Effects on Polymers, pp. 49-59, 1991.
R
Essner Aaron Paul
Wang Aiguo
Zarnowski Alfred J.
Howmedica Osteonics Corp.
Vargot Mathieu D.
LandOfFree
Methods for preparing selectively cross-linked polyethylene... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods for preparing selectively cross-linked polyethylene..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for preparing selectively cross-linked polyethylene... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3507841