Patents by Inventor Koji Kadowaki
Koji Kadowaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230323115Abstract: Disclosed is a polymer composition including a polyester copolymer and a biodegradable polymer, wherein the polyester copolymer includes two types of ester bond-forming monomer residues as main structural units, when the two types of ester bond-forming monomers are defined as “monomer A” and “monomer B”, respectively, the polyester copolymer satisfies (1) to (3) below, the biodegradable polymer has a melting point of 100° C. or higher, and the biodegradable polymer is included in an amount of 0.1% by weight or more and less than 30% by weight in 100% by weight of the total of the polyester copolymer and the biodegradable polymer. The present invention provides a polymer composition having low Young's modulus and high tensile strength. (1) An R value represented by the following formula is 0.45 or more and 0.99 or less.Type: ApplicationFiled: October 18, 2021Publication date: October 12, 2023Applicant: TORAY INDUSTRIES, INC.Inventors: Taisuke KOGAWA, Jiao LU, Koji KADOWAKI, Masataka NAKAMURA
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Patent number: 11253539Abstract: A medical material uses a nickel-titanium alloy wherein a polyelectrolyte has a reduced thickness while a sufficient amount of an antithrombogenic compound for production of a therapeutic effect is supported. The medical material in which a porous surface is formed on a nickel-titanium alloy to allow infiltration of a polyelectrolyte into the pores, to thereby reduce the thickness of the polyelectrolyte exposed on the surface of the nickel-titanium alloy while allowing supporting of a sufficient amount of an antithrombogenic compound due to contribution of the polyelectrolyte infiltrate.Type: GrantFiled: September 28, 2018Date of Patent: February 22, 2022Assignee: Toray Industries, Inc.Inventors: So Kakiyama, Koji Kadowaki, Kazuhiro Tanahashi
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Patent number: 11078327Abstract: A polyester copolymer has two types of ester bond-forming monomer residues as main structural units when the two types of ester bond-forming monomers are defined as “monomer A” and “monomer B”, respectively, the polyester copolymer satisfies (1) and (2): (1) an R value represented by equation: R value=[AB]/(2[A][B])×100 [A]: mole fraction of monomer A residues in the polyester copolymer [% by mol], [B]: mole fraction of monomer B residues in the polyester copolymer [% by mol], and [AB]: mole fraction of a structure in which the monomer A residues and the monomer B residues are adjacent to each other (A-B and B-A) in the polyester copolymer [% by mol], is 0.45 or more and 0.99 or less; and (2) a crystallization rate of at least one of the monomer A residues and the monomer B residues is less than 14%.Type: GrantFiled: August 1, 2018Date of Patent: August 3, 2021Assignee: Toray Industries, Inc.Inventors: Yoshinori Kakizawa, Koji Kadowaki, Kazuhiro Tanahashi, Hirokazu Sakaguchi, Kazuyuki Kidoba
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Patent number: 10709822Abstract: An antithrombogenic metallic material includes a metallic material whose surface is coated with a coating material, the coating material containing: a phosphonic acid derivative or a catechol derivative; a polymer containing, as a constituent monomer, a compound selected from the group consisting of alkyleneimines, vinylamines, allylamines, lysine, protamine, and diallyldimethylammonium chloride; and an anionic compound containing a sulfur atom and having anticoagulant activity; the polymer being covalently bound to the phosphonic acid derivative or the catechol derivative, the phosphonic acid derivative or the catechol derivative being bound to the metallic material through a phosphonic acid group or a catechol group thereof, wherein the abundance ratio of nitrogen atoms to the abundance of total atoms as measured by X-ray photoelectron spectroscopy (XPS) on the surface is 4.0 to 13.0 atomic percent.Type: GrantFiled: March 31, 2016Date of Patent: July 14, 2020Assignee: Toray Industries, Inc.Inventors: Koji Kadowaki, Masaki Fujita, Yuka Sakaguchi, Kazuhiro Tanahashi
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Publication number: 20200215098Abstract: A medical material uses a nickel-titanium alloy wherein a polyelectrolyte has a reduced thickness while a sufficient amount of an antithrombogenic compound for production of a therapeutic effect is supported. The medical material in which a porous surface is formed on a nickel-titanium alloy to allow infiltration of a polyelectrolyte into the pores, to thereby reduce the thickness of the polyelectrolyte exposed on the surface of the nickel-titanium alloy while allowing supporting of a sufficient amount of an antithrombogenic compound due to contribution of the polyelectrolyte infiltrate.Type: ApplicationFiled: September 28, 2018Publication date: July 9, 2020Inventors: So Kakiyama, Koji Kadowaki, Kazuhiro Tanahashi
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Publication number: 20200216607Abstract: A polyester copolymer has two types of ester bond-forming monomer residues as main structural units when the two types of ester bond-forming monomers are defined as “monomer A” and “monomer B”, respectively, the polyester copolymer satisfies (1) and (2): (1) an R value represented by equation: R value=[AB]/(2[A][B])×100 [A]: mole fraction of monomer A residues in the polyester copolymer [% by mol], [B]: mole fraction of monomer B residues in the polyester copolymer [% by mol], and [AB]: mole fraction of a structure in which the monomer A residues and the monomer B residues are adjacent to each other (A-B and B-A) in the polyester copolymer [% by mol], is 0.45 or more and 0.99 or less; and (2) a crystallization rate of at least one of the monomer A residues and the monomer B residues is less than 14%.Type: ApplicationFiled: August 1, 2018Publication date: July 9, 2020Inventors: Yoshinori Kakizawa, Koji Kadowaki, Kazuhiro Tanahashi, Hirokazu Sakaguchi, Kazuyuki Kidoba
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Patent number: 10660738Abstract: A treatment aiding device includes a flexible shaft; a filter; linear supporting members; an elastomer member composed of an elastomer in which a penetrating hole is formed, which elastomer member is arranged in the proximal side relative to the opening section of the filter such that the shaft penetrates the penetrating hole, wherein the outer diameter of the end face in which the penetrating hole is formed is larger than the outer diameter of the opening-section side of the filter when the filter is closed; and an outer tube in which a penetrating hole is formed, which outer tube is arranged in the proximal side relative to the opening section of the filter such that the shaft penetrates the penetrating hole in a state which allows movement of the shaft in the longitudinal direction; wherein the elastomer member is fixed in the distal side of the outer tube.Type: GrantFiled: May 8, 2015Date of Patent: May 26, 2020Assignees: Toray Industries, Inc.Inventors: Kanji Inoue, Takahiro Yagi, Masaki Fujita, Koji Kadowaki, Kazuhiro Tanahashi
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Publication number: 20200022799Abstract: A tubular structure has succeeded in achieving excellent puncture resistance as well as maintenance of flexibility in a base by covering the base with a cover having excellent flexibility. The tubular structure includes a tubular base and a cover which covers the base, wherein the cover includes a copolymer containing a silicone monomer and a polymerizable monomer having a fluoroalkyl group(s) as monomer units.Type: ApplicationFiled: March 30, 2018Publication date: January 23, 2020Inventors: Kyohei Yamashita, Koji Kadowaki, Kazuhiro Tanahashi, Nobuaki Tanaka, Satoshi Yamada, Hiroshi Tsuchikura
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Patent number: 10251742Abstract: An artificial blood vessel is composed of a cylindrical multiple-woven fabric structure allowing only a small amount of blood leakage and can achieve both antithrombogenicity and cellular affinity. The artificial blood vessel includes a cylindrical fabric structure in which a cylindrical fabric whose inside contacts blood is arranged, wherein the cylindrical fabric is a fabric prepared by interlacing a plurality of warp yarns and a plurality of weft yarns with each other into a cylindrical shape; the warp yarns and the weft yarns constituting the cylindrical fabric include a multifilament yarn having a single yarn fineness of not more than 0.50 dtex, and are bound to an antithrombogenic material; the antithrombogenic material forms an antithrombogenic material layer having a thickness of 1 to 600 nm inside the cylindrical fabric; and the water permeability under conditions where a pressure of 16 kPa is applied to the inner surface is less than 300 mL/cm2/min.Type: GrantFiled: February 12, 2015Date of Patent: April 9, 2019Assignee: Toray Industries, Inc.Inventors: Masaki Fujita, Koji Kadowaki, Yuka Sakaguchi, Kazuhiro Tanahashi, Hiroshi Tsuchikura, Satoshi Yamada
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Publication number: 20180344906Abstract: An antithrombogenic metallic material includes a metallic material whose surface is coated with a coating material, the coating material containing: a phosphonic acid derivative or a catechol derivative; a polymer containing, as a constituent monomer, a compound selected from the group consisting of alkyleneimines, vinylamines, allylamines, lysine, protamine, and diallyldimethylammonium chloride; and an anionic compound containing a sulfur atom and having anticoagulant activity; the polymer being covalently bound to the phosphonic acid derivative or the catechol derivative, the phosphonic acid derivative or the catechol derivative being bound to the metallic material through a phosphonic acid group or a catechol group thereof, wherein the abundance ratio of nitrogen atoms to the abundance of total atoms as measured by X-ray photoelectron spectroscopy (XPS) on the surface is 4.0 to 13.0 atomic percent.Type: ApplicationFiled: March 31, 2016Publication date: December 6, 2018Inventors: Koji Kadowaki, Masaki Fujita, Yuka Sakaguchi, Kazuhiro Tanahashi
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Patent number: 10098725Abstract: An endovascular treatment aiding device is an endovascular treatment aiding device including a flexible shaft; a filter fixed to the shaft such that an opening section is formed in the proximal side, wherein a ring having elastic restoring force is fixed to the opening section, which filter is capable of being opened and closed in an umbrella-like manner, and is in a conical shape having a bottom formed by the ring when the filter is open; and a linear supporting member fixed to the ring and a part of the shaft such that they are connected to each other, which linear supporting member enables closing the filter by application of an external force to the proximal side; wherein coils formed with a radio-opaque material is/are wound around the ring; when the filter is closed, a plurality of mountains pointing toward the distal side and a plurality of valleys pointing toward the proximal side are alternately formed in the ring to form a shape in which the mountains are positioned close to each other, and the vallType: GrantFiled: May 8, 2015Date of Patent: October 16, 2018Assignees: Toray Industries, Inc.Inventors: Kanji Inoue, Takahiro Yagi, Masaki Fujita, Koji Kadowaki, Kazuhiro Tanahashi
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Patent number: 10070949Abstract: A vascular prosthesis with tubular woven structure, the prosthesis includes an inner layer adapted to contact a blood flow, the inner layer being formed of warp and weft yarns and having a cover factor of 1800 or more, each of a warp and weft yarns including a microfiber multifilament yarn with a monofilament fineness of 0.50 dtex or less, the multifilament yarn including microfiber monofilaments having an average intersecting angle S of the monofilaments of less than 25°.Type: GrantFiled: November 26, 2014Date of Patent: September 11, 2018Assignee: Toray Industries, Inc.Inventors: Hiroshi Tsuchikura, Satoshi Yamada, Koji Kadowaki, Atsushi Kuwabara
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Patent number: 9987119Abstract: A double-weave vascular prosthesis includes an inner layer that contacts a flow of blood, and an outer layer in contact with the inner layer and having an inner layer-covering rate C (%) of 15%?C?75% defined by formula (1): C=[{(W1×D1+W2×D2)×25.4?W1×W2×D1 ×D2}/(25.4×25.4)]×100??(1), where D1 is a warp density (ends/25.4 mm) of the outer layer, D2 is a weft density (picks/25.4 mm) of the outer layer, W1 is an apparent width (mm) of a warp yarn of the outer layer, and W2 is an apparent width (mm) of a weft yarn of the outer layer, and the apparent width of each yarn is determined as a mean of measurement values for the widths of randomly selected five threads exposed on a surface of the woven structure.Type: GrantFiled: June 17, 2015Date of Patent: June 5, 2018Assignee: Toray Industries, Inc.Inventors: Hiroshi Tsuchikura, Satoshi Yamada, Takayuki Kaneko, Atsushi Kuwabara, Yuka Sakaguchi, Koji Kadowaki, Motoki Takaoka
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Publication number: 20180147044Abstract: A multi-layer tubular woven construct is useful as a hose that transports a fluid or a powder or protects linear bodies such as wires, cables and conduits, as a tubular filter, or as a base material of a vascular prosthesis. In particular, a tubular woven construct in a tubular configuration woven by interlacing warp and weft yarns contains at least in part an elastic fiber yarn having a filament fineness of 1.0 dtex or more, the weft yarn containing at least in part a microfiber yarn having a filament fineness of less than 1.0 dtex.Type: ApplicationFiled: May 19, 2016Publication date: May 31, 2018Inventors: Hiroshi Tsuchikura, Takayuki Kaneko, Satoshi Yamada, Kazuhiro Tanahashi, Koji Kadowaki, Atsushi Kuwabara
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Publication number: 20180140752Abstract: An antithrombogenic material includes a coating material containing: a cationic polymer containing, as a constituent monomer, a compound selected from the group consisting of alkyleneimines, vinylamines, allylamines, lysine, protamine, and diallyldimethylammonium chloride; and an anionic compound containing a sulfur atom and having anticoagulant activity; and a base material whose surface is coated with the coating material; wherein the cationic polymer is covalently bound to the base material; the anionic compound containing a sulfur atom and having anticoagulant activity is immobilized on the surface of the base material by ionic bonding to the cationic polymer; and the average thickness of the coating material is 15 to 400 nm.Type: ApplicationFiled: May 27, 2016Publication date: May 24, 2018Inventors: Koji Kadowaki, Akihiro Saito, Megumi Nakanishi, Masaki Fujita, Kazuhiro Tanahashi
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Patent number: 9943424Abstract: An artificial blood vessel includes a tubular woven fabric composed of a multifilament yarn A including a first polyester and a multifilament yarn B including a second polyester, and has an inner diameter of 8 mm or less and a layer thickness of 50 ?m or more and 250 ?m or less, wherein the multifilament yarn A has a single fiber fineness of 1.0 dtex or more and a total fineness of 33 dtex or less, the multifilament yarn B has a single fiber fineness of 0.08 dtex or less and a total fineness of 66 dtex or less, and the multifilament yarn B forms loops on an inner wall surface of the tubular woven fabric.Type: GrantFiled: April 23, 2014Date of Patent: April 17, 2018Assignee: Toray Industries, Inc.Inventors: Satoshi Yamada, Hiroshi Tsuchikura, Nobuaki Tanaka, Kazuhiro Tanahashi, Yuka Sakaguchi, Masaki Fujita, Koji Kadowaki
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Publication number: 20180076696Abstract: A stationary portion of a motor includes a stator core including teeth, an insulator covering a surface of the stator core, a coil including a conductive wire, a housing, and a circuit board. The housing includes a cylindrical portion in which the stator core is fixed to the outer circumference thereof and a base portion extending from the cylindrical portion radially outward. The circuit board is disposed above the base portion and below the stator core, to which the conductive wire is electrically connected. The insulator includes a tubular portion covering the outer circumference of the cylindrical portion and a vertically deformable elastic portion protruding from the tubular portion radially outward. The circuit board is fixed to the upper surface of a seat portion of the base portion. The circuit board is in contact with the lower surface of the elastic portion radially inside the seat portion.Type: ApplicationFiled: August 31, 2017Publication date: March 15, 2018Inventors: Kosuke MIZUIKE, Tsuyoshi HIROKAWA, Kenji FUKAMI, Koji KADOWAKI
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Publication number: 20170342376Abstract: A fiber structure can be used as a cell scaffold material, which fiber structure includes a multifilament formed by bundling monofilaments having an average fiber diameter of 1 to 15 ?m, wherein each of the monofilaments satisfies Formula (1): (Y/X)×100>50 . . . (1) wherein, in Formula (1), X represents the number of monofilaments for which the average crossing angle is investigated, and Y represents the number of monofilaments having an average crossing angle of not more than 25° in X.Type: ApplicationFiled: October 30, 2015Publication date: November 30, 2017Inventors: Koji Kadowaki, Chisa Kuga, Masaki Fujita, Kazuhiro Tanahashi, Satoshi Yamada, Takayuki Kaneko, Hiroshi Tsuchikura
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Patent number: 9795721Abstract: An antithrombogenic material includes a coating material containing: a polymer containing, as a constituent monomer, a compound selected from the group consisting of alkyleneimines, vinylamines, allylamines, lysine, protamine and diallyldimethylammonium chloride; and an anionic compound containing a sulfur atom and having anticoagulant activity; and a base material whose surface is coated with the coating material; wherein the polymer is covalently bound to the base material; and an abundance ratio of nitrogen atoms to an abundance of total atoms as measured by X-ray photoelectron spectroscopy (XPS) on a surface of the base material is 6.0 to 12.0 atomic percent.Type: GrantFiled: November 27, 2014Date of Patent: October 24, 2017Assignee: Toray Industries, Inc.Inventors: Koji Kadowaki, Masaki Fujita, Yuka Sakaguchi, Kazuhiro Tanahashi
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Publication number: 20170224466Abstract: A double-weave vascular prosthesis includes an inner layer that contacts a flow of blood, and an outer layer in contact with the inner layer and having an inner layer-covering rate C (%) of 15%?C?75% defined by formula (1): C=[{(W1×D1+W2×D2)×25.4?W1×W2×D1×D2}/(25.4×25.4)]×100 ??(1), where D1 is a warp density (ends/25.4 mm) of the outer layer, D2 is a weft density (picks/25.4 mm) of the outer layer, W1 is an apparent width (mm) of a warp yarn of the outer layer, and W2 is an apparent width (mm) of a weft yarn of the outer layer, and the apparent width of each yarn is determined as a mean of measurement values for the widths of randomly selected five threads exposed on a surface of the woven structure.Type: ApplicationFiled: June 17, 2015Publication date: August 10, 2017Applicant: Toray Industries, Inc.Inventors: Hiroshi Tsuchikura, Satoshi Yamada, Takayuki Kaneko, Atsushi Kuwabara, Yuka Sakaguchi, Koji Kadowaki, Motoki Takaoka