Patents Assigned to SHOWA-IKA KOGYO CO. LTD
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Patent number: 9034017Abstract: A spinal fixation titanium alloy rod fixes a plurality of spinal-fixing screws embedded and fixed in vertebrae of a human body. The rod is cylindrically shaped, has a sufficient length for coupling with the spinal-fixing screws, and has a diameter adjusted to 4 to 7 mm. In the titanium alloy constituting the rod, Nb content is 25 to 35 percent by weight, Ta content is such that the Nb content +0.8×Ta content ranges from 36 to 45 percent by weight, Zr content is 3 to 6 percent by weight, and the remainder is Ti and unavoidable impurities, excluding vanadium. The titanium alloy is manufactured by swaging processing at a cross-sectional reduction rate of at least 90%, and aging the swaged titanium alloy by heating at a temperature of 600 to 800K, preferably 700 to 800K, for 43.2 ks to 604.8 ks.Type: GrantFiled: March 26, 2013Date of Patent: May 19, 2015Assignees: Showa-Ika Kogyo Co. Ltd., National University Corporation Tohoku UniversityInventors: Mitsuo Niinomi, Masaaki Nakai, Kengo Narita
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Patent number: 8969430Abstract: A hydroxyapatite ceramic hybrid material includes a hydroxyapatite ceramic structure having pores therein and a biodegradable polymer included in the pores in the hydroxyapatite ceramic structure. The biodegradable polymer can be a poly L-lactic acid polymer. A method for preparing a hydroxyapatite ceramic-biodegradable polymer hybrid material includes preparing a porous hydroxyapatite ceramic containing pores having an average pore diameter of 10 ?m or larger; and forming a biodegradable polymer in the pores of the porous hydroxyapatite ceramic. The porous hydroxyapatite ceramic may be prepared by: preparing a slurry comprising hydroxyapatite fibers and heat-degradable particles in a selected solvent; filtering the slurry to obtain a paste; preparing a molded body using the paste; compacting the molded body to produce a green compact; and firing the green compact at a temperature at least 1000° C. to produce a porous hydroxyapatite ceramic structure.Type: GrantFiled: November 18, 2009Date of Patent: March 3, 2015Assignee: Showa-Ika Kogyo Co. Ltd.Inventors: Mamoru Aizawa, Masahiro Rikukawa
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Patent number: 8871167Abstract: A hydroxyapatite ceramic hybrid material, which includes a biodegradable polymer included in the pores in a hydroxyapatite ceramic structure, and a method thereof, and a calcium phosphate porous body, which is formed by an intertwining of fibrous calcium phosphates and includes a plurality of first pores formed where the fibrous calcium phosphates interconnect and plurality of equal diameter substantially spherical second pores with a larger inside diameter than the first pores, and a method thereof are provided.Type: GrantFiled: November 30, 2011Date of Patent: October 28, 2014Assignees: Meiji University, Showa Ika Kogyo Co. Ltd.Inventors: Mamoru Aizawa, Masahiro Rikukawa, Yusuke Shigemitsu, Hiroshi Nagashima
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Publication number: 20130213535Abstract: A spinal fixation titanium alloy rod fixes a plurality of spinal-fixing screws embedded and fixed in vertebrae of a human body. The rod is cylindrically shaped, has a sufficient length for coupling with the spinal-fixing screws, and has a diameter adjusted to 4 to 7 mm. In the titanium alloy constituting the rod, Nb content is 25 to 35 percent by weight, Ta content is such that the Nb content +0.8×Ta content ranges from 36 to 45 percent by weight, Zr content is 3 to 6 percent by weight, and the remainder is Ti and unavoidable impurities, excluding vanadium. The titanium alloy is manufactured by swaging processing at a cross-sectional reduction rate of at least 90%, and aging the swaged titanium alloy by heating at a temperature of 600 to 800K, preferably 700 to 800K, for 43.2 ks to 604.8 ks.Type: ApplicationFiled: March 26, 2013Publication date: August 22, 2013Applicants: NATIONAL UNIVERSITY CORPORATION TOHOKU UNIVERSITY, SHOWA-IKA KOGYO CO. LTD.Inventors: Mitsuo Niinomi, Masaaki Nakai, Kengo Narita
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Patent number: 8425567Abstract: A spinal fixation titanium alloy rod fixes a plurality of spinal-fixing screws embedded and fixed in vertebrae of a human body. The rod is cylindrically shaped, has a sufficient length for coupling with the spinal-fixing screws, and has a diameter adjusted to 4 to 7 mm. In the titanium alloy constituting the rod, Nb content is 25 to 35 percent by weight, Ta content is such that the Nb content+0.8×Ta content ranges from 36 to 45 percent by weight, Zr content is 3 to 6 percent by weight, and the remainder is Ti and unavoidable impurities, excluding vanadium. The titanium alloy is manufactured by swaging processing at a cross-sectional reduction rate of at least 90%, and aging the swaged titanium alloy by heating at a temperature of 600 to 800K, preferably 700 to 800K, for 43.2 ks to 604.8 ks.Type: GrantFiled: December 10, 2010Date of Patent: April 23, 2013Assignees: Showa-Ika Kogyo Co. Ltd., National University Corporation Tohoku UniversityInventors: Mitsuo Niinomi, Masaaki Nakai, Kengo Narita
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Publication number: 20120136088Abstract: A hydroxyapatite ceramic hybrid material, which includes a biodegradable polymer included in the pores in a hydroxyapatite ceramic structure, and a method thereof, and a calcium phosphate porous body, which is formed by an intertwining of fibrous calcium phosphates and includes a plurality of first pores formed where the fibrous calcium phosphates interconnect and plurality of equal diameter substantially spherical second pores with a larger inside diameter than the first pores, and a method thereof are provided.Type: ApplicationFiled: November 30, 2011Publication date: May 31, 2012Applicants: SHOWA-IKA KOGYO CO. LTD., MEIJI UNIVERSITYInventors: Mamoru Aizawa, Masahiro Rikukawa, Yusuke Shigemitsu, Hiroshi Nagashima
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Publication number: 20110307014Abstract: A spinal fixation titanium alloy rod fixes a plurality of spinal-fixing screws embedded and fixed in vertebrae of a human body. The rod is cylindrically shaped, has a sufficient length for coupling with the spinal-fixing screws, and has a diameter adjusted to 4 to 7 mm. In the titanium alloy constituting the rod, Nb content is 25 to 35 percent by weight, Ta content is such that the Nb content+0.8×Ta content ranges from 36 to 45 percent by weight, Zr content is 3 to 6 percent by weight, and the remainder is Ti and unavoidable impurities, excluding vanadium. The titanium alloy is manufactured by swaging processing at a cross-sectional reduction rate of at least 90%, and aging the swaged titanium alloy by heating at a temperature of 600 to 800K, preferably 700 to 800K, for 43.2 ks to 604.8 ks.Type: ApplicationFiled: December 10, 2010Publication date: December 15, 2011Applicants: NATIONAL UNIVERSITY CORPORATION TOHOKU UNIVERSITY, SHOWA-IKA KOGYO CO. LTD.Inventors: Mitsuo Niinomi, Masaaki Nakai, Kengo Narita
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Publication number: 20100152317Abstract: A hydroxyapatite ceramic hybrid material includes a hydroxyapatite ceramic structure having pores therein and a biodegradable polymer included in the pores in the hydroxyapatite ceramic structure. The biodegradable polymer can be a poly L-lactic acid polymer. A method for preparing a hydroxyapatite ceramic-biodegradable polymer hybrid material includes preparing a porous hydroxyapatite ceramic containing pores having an average pore diameter of 10 ?m or larger; and forming a biodegradable polymer in the pores of the porous hydroxyapatite ceramic. The porous hydroxyapatite ceramic may be prepared by: preparing a slurry comprising hydroxyapatite fibers and heat-degradable particles in a selected solvent; filtering the slurry to obtain a paste; preparing a molded body using the paste; compacting the molded body to produce a green compact; and firing the green compact at a temperature at least 1000° C. to produce a porous hydroxyapatite ceramic structure.Type: ApplicationFiled: November 18, 2009Publication date: June 17, 2010Applicant: SHOWA-IKA KOGYO CO. LTDInventors: Mamoru Aizawa, Masahiro Rikukawa