Patents by Inventor Akihiko Umeno

Akihiko Umeno 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: 9295814
    Abstract: A guide wire includes a first wire disposed on the distal side, and a second wire disposed on the proximal side and made from a material having an elastic modulus larger than that of the first wire. The first wire and the second wire are joined to each other by welding. The second wire has, in the vicinity of the welded portion, a small cross-sectional area portion having a cross-sectional area smaller than that of a proximal end portion of the first wire. The outer diameter of the small cross-sectional area portion is gradually reduced in the direction toward the distal end. The first wire may be made from a superelastic alloy, whereas the second wire may be made from a stainless steel. The first wire and the second wire may be welded to each other by a butt resistance welding process. Since the change in rigidity of the guide wire becomes smooth in the longitudinal direction, the operationality and kink resistance of the guide wire are improved.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: March 29, 2016
    Assignee: TERUMO KABUSHIKI KAISHA
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 9056189
    Abstract: A guide wire includes a first wire disposed on the distal side, and a second wire disposed on the proximal side and made from a material having an elastic modulus larger than that of the first wire. The first wire and the second wire are joined to each other by welding. The second wire has, in the vicinity of the welded portion, a small cross-sectional area portion having a cross-sectional area smaller than that of a proximal end portion of the first wire. The outer diameter of the small cross-sectional area portion is gradually reduced in the direction toward the distal end. The first wire and the second wire may be welded to each other by a butt resistance welding process. Since the change in rigidity of the guide wire becomes smooth in the longitudinal direction, the operationality and kink resistance of the guide wire are improved.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: June 16, 2015
    Assignee: TERUMO KABUSHIKI KAISHA
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 8968215
    Abstract: A guide wire includes a first wire disposed on the distal side of the guide wire and a second wire disposed on the proximal side. The second wire has an elastic modulus larger than the first wire. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side of the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 3, 2015
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Publication number: 20140188083
    Abstract: A guide wire includes a first wire disposed on the distal side, and a second wire disposed on the proximal side and made from a material having an elastic modulus larger than that of the first wire. The first wire and the second wire are joined to each other by welding. The second wire has, in the vicinity of the welded portion, a small cross-sectional area portion having a cross-sectional area smaller than that of a proximal end portion of the first wire. The outer diameter of the small cross-sectional area portion is gradually reduced in the direction toward the distal end. The first wire and the second wire may be welded to each other by a butt resistance welding process. Since the change in rigidity of the guide wire becomes smooth in the longitudinal direction, the operationality and kink resistance of the guide wire are improved.
    Type: Application
    Filed: March 7, 2014
    Publication date: July 3, 2014
    Applicant: TERUMO KABUSHIKI KAISHA
    Inventors: Hiraku MURAYAMA, Akihiko UMENO, Jun IWAMI, Yutaka ITOU, Youki AIMI
  • Publication number: 20140188084
    Abstract: A guide wire includes a first wire disposed on the distal side, and a second wire disposed on the proximal side and made from a material having an elastic modulus larger than that of the first wire. The first wire and the second wire are joined to each other by welding. The second wire has, in the vicinity of the welded portion, a small cross-sectional area portion having a cross-sectional area smaller than that of a proximal end portion of the first wire. The outer diameter of the small cross-sectional area portion is gradually reduced in the direction toward the distal end. The first wire may be made from a superelastic alloy, whereas the second wire may be made from a stainless steel. The first wire and the second wire may be welded to each other by a butt resistance welding process. Since the change in rigidity of the guide wire becomes smooth in the longitudinal direction, the operationality and kink resistance of the guide wire are improved.
    Type: Application
    Filed: March 7, 2014
    Publication date: July 3, 2014
    Applicant: TERUMO KABUSHIKI KAISHA
    Inventors: Hiraku MURAYAMA, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 8376962
    Abstract: A guide wire includes a core possessing a distal end part and a proximal end part, a distal covering layer covering the distal end part of the core, and a proximal covering layer covering the proximal end part of the core. The proximal covering layer includes a first layer that covers the surface of the core, and a second layer that partly covers the surface of the first layer. The first layer has a first part which is not covered by the second layer and a second part which is covered by the second layer, and the surface of the second part is tightly surrounded by the proximal end of the distal covering layer.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: February 19, 2013
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Tadashi Kousai, Akihiko Umeno
  • Patent number: 8348860
    Abstract: A method of making a guide wire involves butting a connection end face at a proximal end of a first wire against a connection end face at a distal end of a second wire while applying voltage and a pressing force to weld together the first and second wires at a welded portion. The welded portion forms a projection that projects outwardly in an outer peripheral direction relative to portions of the first and second wire adjacent the projection. The outer dimension of the projection at the welded portion is adjusted so that upon completing adjusting the outer dimension of the projection the projection still projects outwardly in the outer peripheral direction relative to the portions of the first and second wire adjacent the projection.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: January 8, 2013
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 8348859
    Abstract: A guide wire includes a first wire disposed on the distal side of the guide wire and a second wire disposed on the proximal side. The second wire has an elastic modulus larger than the first wire. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side of the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: January 8, 2013
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 8124905
    Abstract: A method of making a guide wire involves butting a connection end face at a proximal end of a first wire against a connection end face at a distal end of a second wire while applying voltage and a pressing force to weld together the first and second wires at a welded portion. The welded portion forms a projection that projects outwardly in an outer peripheral direction relative to portions of the first and second wire adjacent the projection. The outer dimension of the projection at the welded portion is adjusted so that upon completing adjusting the outer dimension of the projection the projection still projects outwardly in the outer peripheral direction relative to the portions of the first and second wire adjacent the projection.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: February 28, 2012
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 8109887
    Abstract: A method of making a guide wire involves butting a connection end face at a proximal end of a first wire against a connection end face at a distal end of a second wire while applying voltage and a pressing force to weld together the first and second wires at a welded portion. The welded portion forms a projection that projects outwardly in an outer peripheral direction relative to portions of the first and second wire adjacent the projection. The outer dimension of the projection at the welded portion is adjusted so that upon completing adjusting the outer dimension of the projection the projection still projects outwardly in the outer peripheral direction relative to the portions of the first and second wire adjacent the projection.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: February 7, 2012
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Publication number: 20120022503
    Abstract: A method of making a guide wire involves butting a connection end face at a proximal end of a first wire against a connection end face at a distal end of a second wire while applying voltage and a pressing force to weld together the first and second wires at a welded portion. The welded portion forms a projection that projects outwardly in an outer peripheral direction relative to portions of the first and second wire adjacent the projection. The outer dimension of the projection at the welded portion is adjusted so that upon completing adjusting the outer dimension of the projection the projection still projects outwardly in the outer peripheral direction relative to the portions of the first and second wire adjacent the projection.
    Type: Application
    Filed: September 28, 2011
    Publication date: January 26, 2012
    Applicant: TERUMO KABUSHIKI KAISHA
    Inventors: Hiraku MURAYAMA, Akihiko UMENO, Jun IWAMI, Yutaka ITOU, Youki AIMI
  • Publication number: 20110278264
    Abstract: A guide wire includes a first wire disposed on the distal side of the guide wire and a second wire disposed on the proximal side. The second wire has an elastic modulus larger than the first wire. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side of the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.
    Type: Application
    Filed: July 21, 2011
    Publication date: November 17, 2011
    Applicant: Terumo Kabushiki Kaisha
    Inventors: Hiraku MURAYAMA, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 8007447
    Abstract: A guide wire includes a first wire disposed on the distal side of the guide wire and a second wire disposed on the proximal side. The second wire has an elastic modulus larger than the first wire. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side of the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.
    Type: Grant
    Filed: May 11, 2009
    Date of Patent: August 30, 2011
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 7942832
    Abstract: A medical guide wire includes a core wire having a distal portion, and a cover portion formed of a resin for covering at least the distal portion of the core wire, and is provided with a distal shape portion having a curved portion, wherein the distal portion of the core wire includes a tapered portion continuously varied in outside diameter, and a distal flexible portion provided on the distal side of the tapered portion, and the wire diameter variation rate at the tapered portion is 40 to 55%.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: May 17, 2011
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Satoru Kanuka, Chikei Shinohara, Akihiko Umeno, Noriyuki Tamai, Yutaka Tano
  • Patent number: 7922673
    Abstract: A guide wire includes a first wire disposed on the distal side of the guide wire and a second wire disposed on the proximal side from the first wire. The first wire and the second wire are joined to each other by welding. A welded portion formed by welding has a projection projecting in the outer peripheral direction. The height of the projection may be in a range of 0.001 to 0.3 mm. The first wire may be made from a superelastic alloy, and the second wire be made from a stainless steel. The first wire and the second wire are welded to each other by a butt resistance welding process. Such a guide wire has a high joining strength between the first wire and the second wire, to thereby improve the operationality.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: April 12, 2011
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 7892187
    Abstract: A method of making a guide wire involves butting a connection end face at a proximal end of a first wire against a connection end face at a distal end of a second wire while applying voltage and a pressing force to weld together the first and second wires at a welded portion. The welded portion forms a projection that projects outwardly in an outer peripheral direction relative to portions of the first and second wire adjacent the projection. The outer dimension of the projection at the welded portion is adjusted so that upon completing adjusting the outer dimension of the projection the projection still projects outwardly in the outer peripheral direction relative to the portions of the first and second wire adjacent the projection.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: February 22, 2011
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Publication number: 20100228229
    Abstract: A guide wire includes a core possessing a distal end part and a proximal end part, a distal covering layer covering the distal end part of the core, and a proximal covering layer covering the proximal end part of the core. The proximal covering layer includes a first layer that covers the surface of the core, and a second layer that partly covers the surface of the first layer. The first layer has a first part which is not covered by the second layer and a second part which is covered by the second layer, and the surface of the second part is tightly surrounded by the proximal end of the distal covering layer.
    Type: Application
    Filed: March 9, 2010
    Publication date: September 9, 2010
    Applicant: TERUMO KABUSHIKI KAISHA
    Inventors: Tadashi Kousai, Akihiko Umeno
  • Patent number: 7770779
    Abstract: A guide wire includes a wire member having a first wire disposed on the distal side of the guide wire, and a second wire disposed on the proximal side from the first wire. The second wire is made from a material having an elastic modulus larger than that of the first wire. For example, the first wire is made from a superelastic alloy, and the second wire is made from a stainless steel. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side from the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: August 10, 2010
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi
  • Patent number: 7722551
    Abstract: A guide wire includes a wire body and a coil provided so as to cover the distal side of the wire body. The wire body has a first wire disposed on the distal side, a second wire disposed on the proximal side from the first wire, and a third wire disposed on the proximal side from the second wire. The first wire is made from a reshapable metal material such as a stainless steel. The second wire is made from a pseudo-elastic alloy such as a Ni-Ti alloy. The third wire is made from a material having an elastic modulus larger than that of a material for forming the second wire. The first wire and the second wire are joined to each other by welding, and similarly the second wire and the third wire are joined to each other by welding.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: May 25, 2010
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami
  • Patent number: 7607561
    Abstract: A guide wire includes a wire member having a first wire disposed on the distal side of the guide wire, and a second wire disposed on the proximal side from the first wire. The second wire is made from a material having an elastic modulus larger than that of the first wire. For example, the first wire is made from a superelastic alloy, and the second wire is made from a stainless steel. The first wire is joined to the second wire at a welded portion by welding. A coil is disposed on the distal side from the first wire. A cover layer is formed on the outer peripheral surface of the wire member in such a manner as to cover at least the welded portion. The cover layer is made from a material capable of reducing the friction of the cover layer, for example, a fluorocarbon resin or a hydrophilic material, to thereby improve the sliding performance of the guide wire. Such a guide wire is excellent in operationality and kink resistance.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: October 27, 2009
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Akihiko Umeno, Jun Iwami, Yutaka Itou, Youki Aimi