Patents by Inventor Keiji Igaki

Keiji Igaki 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).

  • Patent number: 10231852
    Abstract: A vascular stent (1) for scaffolding a vessel (11) from the inside, wherein the stent is provided with a plurality of tube-forming elements (3A), (3B), and (3C) for forming a tube (2), the tube-forming elements combining with each other to construct a single flow path. Each of the tube-forming elements is formed by bending a strand comprising a single continuous biodegradable polymer, and first and second projecting parts (4, 5) are formed by successive alternation. Formation occurs in multiple stages in the axial direction of the tube by connecting using connecting legs (6) for successively connecting one side of the first projecting part and the other side of the second projecting part where the first and second projecting parts successively alternate. Elastic displacement parts (9) for performing elastic displacement by applying a pressing force to the tube are formed in the middle of the connecting legs successively connecting the first and second projecting parts of the tube-forming elements.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: March 19, 2019
    Assignee: KYOTO MEDICAL PLANNING CO., LTD.
    Inventors: Keiji Igaki, Hirokazu Yamada, Mitsuhiko Kinoshita
  • Patent number: 9668897
    Abstract: Present invention is a stent apparatus wherein a stent covering member holds a stent, which scaffolds a blood vessel from the inside when implanted in the blood vessel, in contracted state. The stent is formed of a biodegradable polylactic acid (PLA) as a tubular shape, shape memorized to a size capable of, when implanted in a vessel, scaffolding the blood vessel from the inside. This stent is held by the stent covering member in contracted state and mounted on a balloon of a balloon. The covering member is formed of a biodegradable polymer having elasticity as a cylindrical shape having an inner diameter to keep the stent in contracted state and, when the stent is expanded to the shape memorized shape, plastically deformed to release the holding of the stent. The stent and the stent covering member disappear in a vessel after they are implanted in the vessel.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: June 6, 2017
    Assignee: Kyoto Medical Planning Co., Ltd.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Publication number: 20160296354
    Abstract: A vascular stent (1) for scaffolding a vessel (11) from the inside, wherein the stent is provided with a plurality of tube-forming elements (3A), (3B), and (3C) for forming a tube (2), the tube-forming elements combining with each other to construct a single flow path. Each of the tube-forming elements is formed by bending a strand comprising a single continuous biodegradable polymer, and first and second projecting parts (4, 5) are formed by successive alternation. Formation occurs in multiple stages in the axial direction of the tube by connecting using connecting legs (6) for successively connecting one side of the first projecting part and the other side of the second projecting part where the first and second projecting parts successively alternate. Elastic displacement parts (9) for performing elastic displacement by applying a pressing force to the tube are formed in the middle of the connecting legs successively connecting the first and second projecting parts of the tube-forming elements.
    Type: Application
    Filed: December 3, 2014
    Publication date: October 13, 2016
    Inventors: Keiji IGAKI, Hirokazu YAMADA, Mitsuhiko KINOSHITA
  • Patent number: 9220618
    Abstract: Medical catheter apparatus used for implanting a vascular stent into a vessel of a living body comprising a catheter including a distal portion where a balloon attaching a vascular stent is provided, and a sheath into which the catheter is inserted and to be moved relative to the catheter between the section where it covers the balloon on which a vascular stent is mounted and the section where it exposes the vascular stent mounted on the balloon. The sheath comprises a first tubular member covering the distal portion at which the balloon is provided, and a second tubular member covering the proximal portion of the catheter and connected with the first tubular member. The first tubular member is formed of a tubular member capable of flexible deformation and the second tubular member is formed of a tubular member less extensible in the axial direction than the first tubular member.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: December 29, 2015
    Assignee: Kyoto Medical Planning Co., Ltd.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Publication number: 20140309722
    Abstract: An object is to surely hold a stent formed of a biodegradable polymer and shape memorized to an expanded size having a diameter larger than an inner diameter of a vessel on a balloon in contracted state. A stent apparatus comprises a stent formed of a biodegradable polymer material using polylactic acid having a shape memory property as a tubular shape and shape memorized to a size capable of scaffolding a vessel from the inside when implanted in the vessel; and a stent holding member formed of a biodegradable polymer material for covering the outer surface of the stent to hold the stent in a contracted state that is smaller in diameter than the shape memorized size, wherein a stent detecting member is attached to the stent and a part of the stent holding member is fixed to the stent detecting member.
    Type: Application
    Filed: February 17, 2012
    Publication date: October 16, 2014
    Applicant: KYOTO MEDICAL PLANNING CO., LTD.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Patent number: 8784466
    Abstract: Disclosed is an apparatus for delivery of a stent for a vessel used for implanting the stent for a vessel in the blood vessel. The delivery system includes a protective sheath (1), inserted into the vessel of a living body, a catheter (2) inserted for back-and-forth movement in the protective sheath (1), a balloon (4) arranged on the outer peripheral surface towards the distal end side of the catheter (2), configured to be protruded from the distal end of the protective sheath (1), so that the balloon is expanded by a fluid supplied to the catheter (2), and a stent for a vessel (5) formed of a biodegradable material. The stent for a vessel (5) is mounted in a state contracted in diameter on the balloon (4) and is moved back and forth along with the balloon (4) relative to the protective sheath (1). The stent for a vessel has at least one end part temporarily held by a temporary holding member (23).
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: July 22, 2014
    Assignee: Kabushikikaisha Igaki Iryo Sekkei
    Inventor: Keiji Igaki
  • Patent number: 8636790
    Abstract: A vascular stent to be implanted in a vessel of a living body to scaffold the vessel from inside is provided. The stent includes a tubular body formed by assembling a plurality of tubular-body forming elements constituting a part of a tubular body. The tubular-body forming elements are formed by bending a strand made of a biodegradable polymer such that legs as linear parts and bend parts alternate in sequence, to form a single flow channel from one end to the other end. The plurality of tubular-body forming elements constitute the tubular body by connecting and unifying two connecting members by melt welding, each of the connecting members being attached to adjacent portions of the plurality of tubular-body forming elements.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: January 28, 2014
    Assignee: Kabushikikaisha Kyoto Iryo Sekkei
    Inventor: Keiji Igaki
  • Patent number: 8617232
    Abstract: Present invention is a medical catheter apparatus used for implanting a vascular stent into a vessel of a living body comprising a catheter (2) provided with a balloon (3), on which a vascular stent (4) is mounted, and a sheath into which the catheter is relatively movably inserted. The catheter is provided at the middle portion with a guide wire leading-out opening (11) for leading out the inserted guide wire (9) toward the side direction of the catheter, the sheath is provided at a middle portion with a guide wire drawing-out opening (13) for drawing the guide wire drawn from the catheter out of the sheath, and a guide wire drawing-out guiding mechanism (14) is provided between the guide wire leading-out opening and the guide wire drawing-out opening for guiding the guide wire led out from the guide wire leading-out opening to the guide wire drawing-out opening.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: December 31, 2013
    Assignee: Kyoto Medical Planning Co., Ltd.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Publication number: 20130345787
    Abstract: A catheter apparatus comprising a catheter and a sheath are provided. The catheter has a distal end to which an insertion guiding member is attached, provided at its distal end with a balloon to expand a vascular stent, and provided with an expansion medium supplying channel for supplying an expansion medium to inflate the balloon and with a guide wire insertion channel for inserting a guide wire. The sheath is operated to move relative to the catheter between the section where it is covering the balloon attaching the vascular stent and the section where it is supposed to expose the vascular stent attached to the balloon. A first movement restrictor and a second movement restrictor are provided, thereby restricting movable position such that excessive movement of the sheath is restricted, injuring of a blood vessel is prevented and the stent is implanted to a desired site in a blood vessel.
    Type: Application
    Filed: November 11, 2011
    Publication date: December 26, 2013
    Applicant: KYOTO MEDICAL PLANNING CO., LTD.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Publication number: 20130297002
    Abstract: Present invention is a stent apparatus in which a stent to scaffold a vessel from the inside is held by a stent covering member comprising: a tubular cartridge expandable and contractible in radial direction, the expansion of which in axial direction orthogonal to the radial direction being restricted; a stent formed of a biodegradable polymer as a tubular shape, shape memorized to an expanded size larger than an inner diameter of a target blood vessel in which the stent is to be implanted, and mounted to the tubular cartridge in contracted state; and a stent covering member formed of a biodegradable polymer having elasticity as a cylindrical shape having an inner diameter to keep the stent in contracted state by holding an outer surface of the stent and, when the stent is expanded to the shape memorized shape, plastically deformed to release the holding of the stent.
    Type: Application
    Filed: July 15, 2011
    Publication date: November 7, 2013
    Applicant: KYOTO MEDICAL PLANNING CO., LTD.
    Inventor: Keiji Igaki
  • Publication number: 20130131778
    Abstract: Present invention is a stent apparatus wherein a stent covering member holds a stent, which scaffolds a blood vessel from the inside when implanted in the blood vessel, in contracted state. The stent is formed of a biodegradable polylactic acid (PLA) as a tubular shape, shape memorized to a size capable of, when implanted in a vessel, scaffolding the blood vessel from the inside. This stent is held by the stent covering member in contracted state and mounted on a balloon of a balloon. The covering member is formed of a biodegradable polymer having elasticity as a cylindrical shape having an inner diameter to keep the stent in contracted state and, when the stent is expanded to the shape memorized shape, plastically deformed to release the holding of the stent. The stent and the stent covering member disappear in a vessel after they are implanted in the vessel.
    Type: Application
    Filed: July 19, 2011
    Publication date: May 23, 2013
    Applicant: KYOTO MEDICAL PLANNING CO., LTD.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Publication number: 20120245669
    Abstract: Medical catheter apparatus used for implanting a vascular stent into a vessel of a living body comprising a catheter including a distal portion where a balloon attaching a vascular stent is provided, and a sheath into which the catheter is inserted and to be moved relative to the catheter between the section where it covers the balloon on which a vascular stent is mounted and the section where it exposes the vascular stent mounted on the balloon. The sheath comprises a first tubular member covering the distal portion at which the balloon is provided, and a second tubular member covering the proximal portion of the catheter and connected with the first tubular member. The first tubular member is formed of a tubular member capable of flexible deformation and the second tubular member is formed of a tubular member less extensible in the axial direction than the first tubular member.
    Type: Application
    Filed: September 9, 2010
    Publication date: September 27, 2012
    Applicant: Kyoto Medical Planning Co., Ltd.
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Patent number: 8262687
    Abstract: A stent holding member used in a stent delivery system adapted to implant a stent of a cylindrical configuration, designed to be embedded in a living body, to a desired site of implantation in a vessel of the living body. The stent holding member includes a tubular holding member formed of an elastic material. The holder has a groove in its outer peripheral portion for holding one or more supporting struts making up the stent. Each of these supporting struts is embedded at least partially in the groove to hold the stent. The groove has its opening end side expanded by expansion of the holder along the radial direction. By expansion of the opened end of the groove, the stent held in the groove is dilated and released from the holder.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: September 11, 2012
    Assignee: Kyoto Medical Planning Co., Ltd.
    Inventor: Keiji Igaki
  • Publication number: 20120185030
    Abstract: Present invention is a medical catheter apparatus used for implanting a vascular stent into a vessel of a living body comprising a catheter (2) provided with a balloon (3), on which a vascular stent (4) is mounted, and a sheath into which the catheter is relatively movably inserted. The catheter is provided at the middle portion with a guide wire leading-out opening (11) for leading out the inserted guide wire (9) toward the side direction of the catheter, the sheath is provided at a middle portion with a guide wire drawing-out opening (13) for drawing the guide wire drawn from the catheter out of the sheath, and a guide wire drawing-out guiding mechanism (14) is provided between the guide wire leading-out opening and the guide wire drawing-out opening for guiding the guide wire led out from the guide wire leading-out opening to the guide wire drawing-out opening.
    Type: Application
    Filed: September 9, 2010
    Publication date: July 19, 2012
    Applicant: KYOTO MEDICAL PLANNING CO., LTD
    Inventors: Keiji Igaki, Hirokazu Yamada
  • Patent number: 8070793
    Abstract: Disclosed is a stent for a vessel implanted and left in the vessel of a living body to support the lumen of the vessel from inside. The stent for a vessel consists of a plurality of stent constituting members (4a and 4b), formed by combining a plurality of the tubular-body constituting elements (5a and 5b) in multistage, each of the tubular-body forming elements (5) comprising a part of a tubular member (2) is formed by bending a yarn (3) of a biodegradable polymer in a zigzag design. Each of stent constituting members (4a and 4b) is comprised with tubular segments (6) formed by combining the tubular-body forming elements (5a and 5b) facing each other, and by continuously joining at least neighboring parts of each tubular-body forming element (5a and 5b) together, to comprise a continuously joined tubular body (2).
    Type: Grant
    Filed: November 11, 2005
    Date of Patent: December 6, 2011
    Assignee: Kabushikikaisha Igaki Iryo Sekkei
    Inventor: Keiji Igaki
  • Publication number: 20110184506
    Abstract: A vascular stent to be implanted in a vessel of a living body to scaffold the vessel from inside is provided. The stent includes a tubular body formed by assembling a plurality of tubular-body forming elements constituting a part of a tubular body. The tubular-body forming elements are formed by bending a strand made of a biodegradable polymer such that legs as linear parts and bend parts alternate in sequence, to form a single flow channel from one end to the other end. The plurality of tubular-body forming elements constitute the tubular body by connecting and unifying two connecting members by melt welding, each of the connecting members being attached to adjacent portions of the plurality of tubular-body forming elements.
    Type: Application
    Filed: June 19, 2009
    Publication date: July 28, 2011
    Applicant: KABUSHIKIKAISHA KYOTO IRYO SEKKEI
    Inventor: Keiji Igaki
  • Publication number: 20100298926
    Abstract: A cylindrically-shaped element forming a luminal stent includes a cylindrical body including a strand of a biodegradable polymer. The strand is repeatedly bent such that linear parts and bend parts alternate in sequence, and ends of the strand are connected together to form a cylindrical shape. Both ends of the strand constituting the cylindrically-shaped elements are connected together by a cylindrical connecting member of a biodegradable polymer holding both ends.
    Type: Application
    Filed: October 15, 2008
    Publication date: November 25, 2010
    Applicant: Kabushikikaisha Kyoto Iryo Sekkei
    Inventor: Keiji Igaki
  • Patent number: D622387
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: August 24, 2010
    Assignee: Kabushikikaisha Kyoto Iryo Sekkei
    Inventor: Keiji Igaki
  • Patent number: D622388
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: August 24, 2010
    Assignee: Kabushikikaisha Kyoto Iryo Sekkei
    Inventor: Keiji Igaki
  • Patent number: D723166
    Type: Grant
    Filed: February 7, 2014
    Date of Patent: February 24, 2015
    Assignee: Kyoto Medical Planning Co., Ltd.
    Inventors: Keiji Igaki, Hirokazu Yamada, Chisa Matsubara