Patents by Inventor Naofumi Okajima

Naofumi Okajima 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: 10244947
    Abstract: An introducer having a dilator positioned in a sheath is inserted into a first blood vessel and, thereafter, only the dilator tube is drawn out of the first blood vessel and the sheath while the sheath remains in the first blood vessel. A diagnostic instrument having an outer diameter smaller than a maximum outer diameter permitting insertion into the sheath tube is inserted into the second blood vessel, and a stenosis of the second blood vessel is diagnosed. While keeping the sheath indwelling in the first blood vessel, a therapeutic instrument or a catheter permitting the therapeutic instrument to be inserted therein, which therapeutic instrument or catheter has a maximum outer diameter permitting insertion into the sheath tube, is inserted into the second blood vessel, and the second blood vessel is treated.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: April 2, 2019
    Assignee: TERUMO KABUSHIKI KAISHA
    Inventors: Naofumi Okajima, Ryo Okamura
  • Publication number: 20170189651
    Abstract: An introducer having a dilator positioned in a sheath is inserted into a first blood vessel and, thereafter, only the dilator tube is drawn out of the first blood vessel and the sheath while the sheath remains in the first blood vessel. A diagnostic instrument having an outer diameter smaller than a maximum outer diameter permitting insertion into the sheath tube is inserted into the second blood vessel, and a stenosis of the second blood vessel is diagnosed. While keeping the sheath indwelling in the first blood vessel, a therapeutic instrument or a catheter permitting the therapeutic instrument to be inserted therein, which therapeutic instrument or catheter has a maximum outer diameter permitting insertion into the sheath tube, is inserted into the second blood vessel, and the second blood vessel is treated.
    Type: Application
    Filed: March 20, 2017
    Publication date: July 6, 2017
    Applicant: TERUMO KABUSHIKI KAISHA
    Inventors: Naofumi OKAJIMA, Ryo OKAMURA
  • Patent number: 9649035
    Abstract: An introducer having a dilator positioned in a sheath is inserted into a first artery and, thereafter, only the dilator tube is drawn out of the first artery and the sheath while the sheath remains in the first artery. A diagnostic instrument having an outer diameter smaller than a maximum outer diameter permitting insertion into the sheath tube is inserted into the second artery, and a stenosis of the second artery is diagnosed. While keeping the sheath indwelling in the first artery, a therapeutic instrument or a catheter permitting the therapeutic instrument to be inserted therein, which therapeutic instrument or catheter has a maximum outer diameter permitting insertion into the sheath tube, is inserted into the second artery, and the second artery is treated.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: May 16, 2017
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Naofumi Okajima, Ryo Okamura
  • Publication number: 20130281850
    Abstract: An introducer having a dilator positioned in a sheath is inserted into a first artery and, thereafter, only the dilator tube is drawn out of the first artery and the sheath while the sheath remains in the first artery. A diagnostic instrument having an outer diameter smaller than a maximum outer diameter permitting insertion into the sheath tube is inserted into the second artery, and a stenosis of the second artery is diagnosed. While keeping the sheath indwelling in the first artery, a therapeutic instrument or a catheter permitting the therapeutic instrument to be inserted therein, which therapeutic instrument or catheter has a maximum outer diameter permitting insertion into the sheath tube, is inserted into the second artery, and the second artery is treated.
    Type: Application
    Filed: April 19, 2013
    Publication date: October 24, 2013
    Applicant: TERUMO KABUSHIKI KAISHA
    Inventors: Naofumi OKAJIMA, Ryo Okamura
  • Patent number: 5876385
    Abstract: A catheter is provided whose distal end can be introduced through an artery in the arm into the entrance of the left coronary artery. The catheter includes a catheter body having an outer diameter of at most 2.7 mm over its entire length and has a proximal segment straight under a free state and a distal segment having a curved shape under a free state. The distal segment includes a first straight portion contiguous to the proximal segment through a first curved portion, a second straight portion contiguous to the first straight portion through a second curved portion bent in a direction opposite to the bending direction of the first curved portion, a third straight portion contiguous to the second straight portion through a third curved portion bent in the bending direction of the second curved portion, and a straight distal end portion contiguous to the third straight portion through a fourth curved portion bent in the bending direction of the third curved portion.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: March 2, 1999
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Yuuji Ikari, Naofumi Okajima
  • Patent number: 5554139
    Abstract: A catheter includes an inner layer, an outer layer, and an intermediate layer arranged between the inner and outer layers. This intermediate layer including a coil layer having a double layer coil portion composed of an inner coil wound in a first direction and an outer coil wound around the outside of the inner coil in a second direction that is opposite to the first direction, wherein the inner coil and the outer coil are formed from flat members whose ratios of thickness to width of cross section are less than 1. The intermediate layer further includes a rigid layer having a rigidity higher than at least one of the rigidities of the inner and outer layers. The rigid layer is arranged in a main body portion positioned in a proximal side of the catheter and the coil layer is arranged at least in a tip portion of the catheter which is positioned in a distal side of the catheter.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: September 10, 1996
    Assignee: Terumo Kabushiki Kaisha
    Inventor: Naofumi Okajima
  • Patent number: 5538513
    Abstract: A catheter tube is composed of a main portion and a tip portion. The main portion of the catheter tube is of such a structure that an inner tube and an outer tube are joined via a reinforcing material layer, but the tip portion is of such a structure that only the inner tube and the outer tube are joined without intervening the reinforcing material layer between the two tubes. The reinforcing material layer is formed by arranging a filamentous element (e.g., stainless steel wire) around the inner tube in a lattice manner. The inclination angles .theta.1, .theta.2 and .theta.3 of the filamentous element with respect to the axis of the catheter tube at the first, second and third regions, respectively are determined so as to establish the relationship as .theta.1<.theta.2<.theta.3. Therefore, the rigidity of the catheter can be increased in accordance with the decrease of the inclination angle of the filamentous element.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: July 23, 1996
    Assignee: Terumo Kabushiki Kaisha
    Inventor: Naofumi Okajima
  • Patent number: 5229211
    Abstract: A medical device for insertion into a body, wherein a part of a substrate thereof destined to be inserted into the body is furnished with a coating of a polymer manifesting lubricity in a wetted state and a part of said substrate destined substantially not be inserted into the body is furnished with said polymer coating treated for divestiture of lubricity.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: July 20, 1993
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Hiraku Murayama, Naofumi Okajima