Abstract: An orthopedic prosthetic joint comprising a joint couple having a first bearing surface made of a poly aryl ether ketone (PAEK) and a second joint component having a second bearing made of a polymer that is softer than the PAEK such as UHMWPE the first and second bearing surfaces in sliding engagement with one another.

Abstract: A method for preparing 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene, including: providing a first reactor including a first section, a second section, and a third section, with each section being filled with different catalysts, preheating hexafluoropropylene and hydrogen, and introducing the hexafluoropropylene and the hydrogen to the first reactor to yield a first mixture including: 1,1,1,2,3-pentafluoropropane, 1,1,1,2,3,3-hexafluoropropane, and hydrogen fluoride; introducing the first mixture to a first distillation column to yield 1,1,1,2,3,3-hexafluoropropane at a top of the first distillation column and 1,1,1,2,3-pentafluoropropane and hydrogen fluoride at a bottom of the first distillation column, recycling the 1,1,1,2,3,3-hexafluoropropane to a lower part of the first section of the first reactor, and introducing the 1,1,1,2,3-pentafluoropropane and the hydrogen fluoride to a second reactor to yield a second mixture including: 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, hydr

Abstract: A method of fabricating a material having a high concentration of a carbide constituent. The method may comprise adding a carbide source to a biocompatible material in which a weight of the carbide source is at least approximately 10% of the total weight, heating the carbide source and the biocompatible material to a predetermined temperature to melt the biocompatible material and allow the carbide source to go into solution to form a molten homogeneous solution, and impinging the molten homogeneous solution with a high pressure fluid to form spray atomized powder having carbide particles. The size of a particle of carbide in the atomized powder may be approximately 900 nanometers or less. The biocompatible material may be cobalt chrome, the carbide source may be graphite, and the fluid may be a gas or a liquid.

Abstract: A prosthetic head for a femoral component has a metal shell with a tapered cavity. The shell has a part-spherical outer surface defining an inner portion terminating in an open end. A polymeric material completely fills the inner portion of the hollow shell extending from an inner surface of the shell to the open end. The polymeric material includes a conically tapered socket centered about the polar axis intermediate ends of the open end wherein the shell is a hollow titanium shell having an inner surface with a porous structure for receiving a portion of the polymeric material. The hollow titanium shell inner surface has at least one rib extending inwardly toward the conically tapered socket.

Abstract: A method for preparing 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene, including: providing a first reactor including a first section, a second section, and a third section, with each section being filled with different catalysts, preheating hexafluoropropylene and hydrogen, and introducing the hexafluoropropylene and the hydrogen to the first reactor to yield a first mixture including: 1,1,1,2,3-pentafluoropropane, 1,1,1,2,3,3-hexafluoropropane, and hydrogen fluoride; introducing the first mixture to a first distillation column to yield 1,1,1,2,3,3-hexafluoropropane at a top of the first distillation column and 1,1,1,2,3-pentafluoropropane and hydrogen fluoride at a bottom of the first distillation column, recycling the 1,1,1,2,3,3-hexafluoropropane to a lower part of the first section of the first reactor, and introducing the 1,1,1,2,3-pentafluoropropane and the hydrogen fluoride to a second reactor to yield a second mixture including: 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, hydro

Abstract: A utility knife including a housing (19), two parallel knife holders slidingly disposed substantially parallel to each other inside the front section of the housing; different blades (5) are positioned on the two knife holders; each push button (6) is movably disposed on top of one knife holder (3); a strip-shaped aperture (17) is provided on top of the inner wall of the housing (19); the strip-shaped aperture has two grooves (1e), parallel to each other, for receiving the two push buttons and for allowing the two push buttons (6) to slide along the two parallel grooves; and a plurality of recesses (1a) are distributed inside each groove; each push button further comprises a snap block (61), when the snap block (61) is inserted into the corresponding recess (1a), the corresponding knife holder (3) and the blade (5) are locked in position.

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.

Abstract: A method for preparing 2,3,3,3-tetrafluoropropene, including: a) introducing hexafluoropropylene and hydrogen to a first reactor for reaction in the presence of a catalyst to obtain a first mixture; b) washing and drying the first mixture, and introducing the treated first mixture to a first distillation column to obtain 1,1,1,2,3,3-hexafluoropropane, 1,1,1,2,3-pentafluoropropene, and hexafluoropropylene; recycling the 1,1,1,2,3,3-hexafluoropropane to the first reactor, and introducing the 1,1,1,2,3-pentafluoropropene and the hexafluoropropylene to a second distillation column to yield hexafluoropropylene and 1,1,1,2,3-pentafluoropropene; and recycling the hexafluoropropylene to the first reactor; c) introducing the 1,1,1,2,3-pentafluoropropene and hydrogen to a second reactor in the presence of a catalyst to obtain a second mixture; and d) washing and drying the second mixture, and introducing the second mixture to a third distillation column to yield 1,1,1,2,3-pentafluoropropane; and recycling the 1,1,1,2,3

Abstract: A method for preparing 2,3,3,3-tetrafluoropropene, including: a) introducing hexafluoropropylene and hydrogen to a first reactor for reaction in the presence of a catalyst to obtain a first mixture; b) washing and drying the first mixture, and introducing the treated first mixture to a first distillation column to obtain 1,1,1,2,3,3-hexafluoropropane, 1,1,1,2,3-pentafluoropropene, and hexafluoropropylene; recycling the 1,1,1,2,3,3-hexafluoropropane to the first reactor, and introducing the 1,1,1,2,3-pentafluoropropene and the hexafluoropropylene to a second distillation column to yield hexafluoropropylene and 1,1,1,2,3-pentafluoropropene; and recycling the hexafluoropropylene to the first reactor; c) introducing the 1,1,1,2,3-pentafluoropropene and hydrogen to a second reactor in the presence of a catalyst to obtain a second mixture; and d) washing and drying the second mixture, and introducing the second mixture to a third distillation column to yield 1,1,1,2,3-pentafluoropropane; and recycling the 1,1,1,2,3

Abstract: A method for coating an orthopedic implant made of a titanium or titanium alloy substrate with a cobalt-chrome molybdenum alloy uses multi-arc physical vapor deposition (MA-PVD). The substrate has a first bearing surface coated with a coating made of the deposited cobalt-chromium molybdenum alloy. The bearing surface slidably receives a second bearing surface of the prosthetic joint component. The MA-PVD cobalt-chromium molybdenum alloy coating forming the first bearing surface is made up of hexagonal close packed (HCP) grains having a columnar structure with a length of about 1 ?m and a width of about 0.1 ?m with the length of each HCP grains being oriented generally perpendicular to the titanium substrate bearing surface.

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.

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.

Abstract: A utility knife including a housing (19), two parallel knife holders slidingly disposed substantially parallel to each other inside the front section of the housing; different blades (5) are positioned on the two knife holders; each push button (6) is movably disposed on top of one knife holder (3); a strip-shaped aperture (17) is provided on top of the inner wall of the housing (19); the strip-shaped aperture has two grooves (1e), parallel to each other, for receiving the two push buttons and for allowing the two push buttons (6) to slide along the two parallel grooves; and a plurality of recesses (1a) are distributed inside each groove; each push button further comprises a snap block (61), when the snap block (61) is inserted into the corresponding recess (1a), the corresponding knife holder (3) and the blade (5) are locked in position.

Abstract: A method of fabricating a material having a high concentration of a carbide constituent. The method may comprise adding a carbide source to a biocompatible material in which a weight of the carbide source is at least approximately 10% of the total weight, heating the carbide source and the biocompatible material to a predetermined temperature to melt the biocompatible material and allow the carbide source to go into solution to form a molten homogeneous solution, and impinging the molten homogeneous solution with a high pressure fluid to form spray atomized powder having carbide particles. The size of a particle of carbide in the atomized powder may be approximately 900 nanometers or less. The biocompatible material may be cobalt chrome, the carbide source may be graphite, and the fluid may be a gas or a liquid.

Abstract: A method of fabricating a material having a high concentration of a carbide constituent. The method may comprise adding a carbide source to a biocompatible material in which a weight of the carbide source is at least approximately 10% of the total weight, heating the carbide source and the biocompatible material to a predetermined temperature to melt the biocompatible material and allow the carbide source to go into solution to form a molten homogeneous solution, and impinging the molten homogeneous solution with a high pressure fluid to form spray atomized powder having carbide particles. The size of a particle of carbide in the atomized powder may be approximately 900 nanometers or less. The biocompatible material may be cobalt chrome, the carbide source may be graphite, and the fluid may be a gas or a liquid.

Abstract: A method for removing a stem portion of an orthopedic implant from a bone comprises exposing an implanted orthopedic implant having a body portion, a stem portion interconnected to the body and a porous metal section forming an interconnection between the body and the stem portion. A cutting tool is mounted on a holder connected to an exposed surface of the orthopedic implant. The porous section is aligned with the cutting tool mounted on the holder. The entire porous section is cut by moving the cutting tool therethrough in a direction transverse to the stem portion axis. The implant body portion is then removed and then the stem portion is removed from the bone. The cutting tool may be a saw or chisel which may be mounted on a guide fixed to the body portion.

Abstract: An orthopedic implant has a prosthetic joint component made, for example, of polyethylene and another component made of a titanium or titanium alloy substrate. The substrate has a first bearing surface coated with a coating made of a cobalt-chromium molybdenum alloy. The bearing surface slidably receives a second bearing surface of the prosthetic joint component. The cobalt-chromium molybdenum alloy coating forming the first bearing surface is made up of hexagonal close packed (HCP) grains having a columnar structure with a length of about 1 ?m and a width of about 0.1 ?m with the length of each HCP grains being oriented generally perpendicular to the titanium substrate bearing surface.