Patents Assigned to Piolax Medical Devices, Inc.
  • Patent number: 10278843
    Abstract: A stent has strut parts bent in a zigzag shape, connected at both ends thereof, and formed in a ring shape, and bridge parts for connecting the strut parts in an axial direction, peak parts of strut parts excluding a strut part at the lead toward one end are all connected by bridge parts and clustered a plurality thereof at a time by the bridge parts, and connected to valley parts of struts adjacent toward the one end of the stent, and each strut part includes valley parts which are not connected to a bridge part.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: May 7, 2019
    Assignee: PIOLAX MEDICAL DEVICES, INC.
    Inventors: Yoshihide Toyokawa, Kyosuke Shirakawa
  • Patent number: 10080640
    Abstract: Provided are a stent to be placed in the bile duct and a process for producing the stent, the stent hollow being less apt to be blocked even when the stent is placed in the bile duct for a long period. The inner peripheral surface of the stent is coated with a resin layer with resistance to sludge formation that includes a polymer obtained by polymerizing 2-methoxyethyl acrylate. This stent is produced by applying a coating fluid that contains 0.1-0.5 mass % polymer obtained by polymerizing 2-methoxyethyl acrylate, to the inner peripheral surface of a stent.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: September 25, 2018
    Assignees: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY, PIOLAX MEDICAL DEVICES, INC.
    Inventors: Masaru Tanaka, Makiko Aoki, Chikako Sato, Yoshihide Toyokawa, Kyosuke Shirakawa
  • Patent number: 9901357
    Abstract: The foreign matter capture instrument includes: a first manipulation wire; framework wire materials, the base end parts being coupled to a leading end part of the first manipulation wire, and the leading end parts being respectively bundled together; and a second manipulation wire which is coupled to the leading end parts of the framework wire materials, separates from the first manipulation wire extending toward the base end side of the first manipulation wire. By moving the first manipulation wire toward the leading end side relative to the second manipulation wire, the framework wire materials expand and configure a basket, and by further relatively moving the first manipulation wire toward the leading end side, the basket becomes shallower.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: February 27, 2018
    Assignee: PIOLAX MEDICAL DEVICES, INC.
    Inventors: Risa Sase, Satoshi Yoshita, Hirofumi Kawamoto
  • Publication number: 20180028337
    Abstract: A stent has strut parts bent in a zigzag shape, connected at both ends thereof; and formed in a ring shape, and bridge parts for connecting the strut parts in an axial direction, peak parts of strut parts excluding a strut part at the lead toward one end are all connected by bridge parts and clustered a plurality thereof at a time by the bridge parts, and connected to valley parts of struts adjacent toward the one end of the stent, and each strut part includes valley parts which are not connected to a bridge part.
    Type: Application
    Filed: February 8, 2016
    Publication date: February 1, 2018
    Applicant: Piolax Medical Devices, Inc.
    Inventors: Yoshihide TOYOKAWA, Kyosuke SHIRAKAWA
  • Publication number: 20170216567
    Abstract: One embodiment provides a balloon catheter which has an inner tube having a main lumen and an outer tube which forms an expansion lumen. A part of the inner tube is connected to the outer tube at a position closer to the proximal end than a balloon, a side hole is open at the connection section, and a weak section is provided to the inner tube a position closer to the distal end than the side hole. The weak section has lower rigidity than the remaining portion of the inner tube. When the balloon is expanded by fluid supplied to the expansion lumen, the weak section is pressed by the fluid pressure to thereby close the main lumen of the inner tube.
    Type: Application
    Filed: August 25, 2015
    Publication date: August 3, 2017
    Applicant: PIOLAX MEDICAL DEVICES, INC.
    Inventors: Masanori KITAGAWA, Kazutaka NANAUMI
  • Patent number: 9636478
    Abstract: A medical tube, which is inserted into a tubular organ and discharges and suctions fluid, is provided with a tube-shape main body which extends a prescribed length and with a valve which is disposed in a portion of the main body that is inserted into the tubular organ and can discharge or suction a fluid, wherein the valve includes multiple slits which are formed so as to extend axially of the body a prescribed length, reaching from the outer periphery to the inner periphery of the main body, and which are provided spaced in the circumferential direction of the main body. Each slit is formed tilted in the same direction with respect to a radially-extending line which passes through the axial center of the main body.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: May 2, 2017
    Assignees: NATIONAL CANCER CENTER, PIOLAX MEDICAL DEVICES, INC.
    Inventors: Yasuaki Arai, Shinichi Sakai, Yuuki Inami
  • Patent number: 9480550
    Abstract: A highly elastic stent is made of an alloy that exhibits superelasticity at body temperature. At least a part of the highly elastic stent has such a property that load increases with displacement without exhibiting a distinct yield on a load-displacement curve obtained by a compression test and a bending test.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: November 1, 2016
    Assignees: CLINO LTD., PIOLAX MEDICAL DEVICES, INC., JAPAN MEDICAL DEVICE TECHNOLOGY CO., LTD.
    Inventor: Kiyoshi Yamauchi
  • Patent number: 9393133
    Abstract: An abdominal cavity-vein shunt stent provided for transporting ascites accumulated in the abdominal cavity of a patient to a vascular system, includes: a stent body which extends cylindrically long and which has one end disposed in the intrahepatic vein, and the other end piercing the liver parenchyma and disposed in the abdominal cavity; and a one-way valve which is disposed in the stent body, which is opened to drain ascites into the intrahepatic vein when a differential pressure obtained by subtracting the pressure of the intrahepatic vein from the pressure in the abdominal cavity is not lower than a predetermined value, and which is closed when the differential pressure is lower than the predetermined value.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: July 19, 2016
    Assignees: PIOLAX MEDICAL DEVICES, INC., NATIONAL CANCER CENTER
    Inventors: Yasuaki Arai, Shinichi Sakai
  • Patent number: 8986328
    Abstract: In a background-art medical gripping device, when a wall surface of an in vivo tissue has a large tear, a side portion of the tear can be gripped by the gripping device, but the other side portion opposed to the side portion cannot be gripped simultaneously. Therefore, to close the tear, complicated operation is required to be performed using plural gripping devices. A medical gripping device according to the present invention includes a fixed clip, a pair of movable clips made from an elastic material and provided to face the fixed clip, the movable clips having lower ends fixed to the fixed clip and the other ends opened, and a control mechanism which shifts from each other a timing at which a gripping target is gripped between one of the movable clips and the fixed clip and a timing at which the target is gripped between the other movable clip and the fixed clip.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: March 24, 2015
    Assignee: Piolax Medical Devices, Inc.
    Inventors: Yoshinori Mizumoto, Tsuyoshi Nakakubo
  • Publication number: 20130325103
    Abstract: An abdominal cavity-vein shunt stent provided for transporting ascites accumulated in the abdominal cavity of a patient to a vascular system, includes: a stent body which extends cylindrically long and which has one end disposed in the intrahepatic vein, and the other end piercing the liver parenchyma and disposed in the abdominal cavity; and a one-way valve which is disposed in the stent body, which is opened to drain ascites into the intrahepatic vein when a differential pressure obtained by subtracting the pressure of the intrahepatic vein from the pressure in the abdominal cavity is not lower than a predetermined value, and which is closed when the differential pressure is lower than the predetermined value.
    Type: Application
    Filed: February 18, 2011
    Publication date: December 5, 2013
    Applicants: NATIONAL CANCER CENTER, PIOLAX MEDICAL DEVICES, INC.
    Inventors: Yasuaki Arai, Shinichi Sakai
  • Patent number: 8566995
    Abstract: Provided is an endoscopic duct cleaning tool which uses elastic porous members to prevent the inside of a duct of an endoscope from being damaged, and which can firmly fix the elastic porous members to a core wire and secure a sufficient thickness in each of the elastic porous members. This endoscopic duct cleaning tool 1 is inserted into a duct 53 of an endoscope 50 to clean the duct 53. The endoscopic duct device 1 includes a core wire 10 consisting of a stranded wire, plural cylindrical elastic porous members 20 disposed at certain intervals and at certain places in an axial direction of the core wire 10 so as to cover an outer circumference of the core wire 10 directly, and resin tubes 30 covering outer circumferences of portions of the core wire 10 which are not covered with the elastic porous members 20. An outer diameter of each of the resin tubes 30 is formed to be larger than an inner diameter of each of the elastic porous members 20.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: October 29, 2013
    Assignee: Piolax Medical Devices, Inc.
    Inventors: Hiroyuki Asano, Yasuo Yoshikawa, Yasuhiro Hoshino, Hirokazu Higuchi, Takayuki Nitta
  • Patent number: 8114047
    Abstract: A drug solution infusion catheter includes a distal end wall made of an elastic material. The distal end wall closes a distal end surface of the catheter. A center portion of the distal end wall is thinner than a peripheral edge portion of the distal end wall. The center portion of the distal end wall defines a hole or an incision. The hole or the incision closes normally. When a guide wire is pressed against the hole or the incision from an inner side of the catheter or an outer side of the catheter, the hole or the incision elastically opens to allow the guide wire to pass therethrough. An outside of the peripheral edge portion of the distal end wall makes up the distal end surface of the catheter.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: February 14, 2012
    Assignee: Piolax Medical Devices, Inc.
    Inventor: Shinichi Sakai
  • Patent number: 8052740
    Abstract: A stent includes a plurality of annular units each made of a linear portion which extends circumferentially while folding in a zigzag manner and which is connected annularly, and connection portions which connect axially adjacent ones of the annular units with each other. Predetermined annular units have radiopaque markers each fixedly attached midway between one folded portion and a next folded portion in the linear portion located in a predetermined circumferential position.
    Type: Grant
    Filed: December 25, 2007
    Date of Patent: November 8, 2011
    Assignee: Piolax Medical Devices, Inc.
    Inventor: Hiroyuki Asano
  • Publication number: 20050256509
    Abstract: A drug solution infusion catheter includes a distal end wall made of an elastic material. The distal end wall closes a distal end surface of the catheter. A center portion of the distal end wall is thinner than a peripheral edge portion of the distal end wall. The center portion of the distal end wall defines a hole or an incision. The hole or the incision closes normally. When a guide wire is pressed against the hole or the incision from an inner side of the catheter or an outer side of the catheter, the hole or the incision elastically opens to allow the guide wire to pass therethrough. An outside of the peripheral edge portion of the distal end wall makes up the distal end surface of the catheter.
    Type: Application
    Filed: May 13, 2005
    Publication date: November 17, 2005
    Applicant: Piolax Medical Devices, Inc.
    Inventor: Shinichi Sakai
  • Publication number: 20040116844
    Abstract: It is a catheter for a peritoneovenous shunt, which has a tapered distal inlet at an end of a catheter body constituted by a polyurethane tube that is 90 cm in length, 3 mm in outside diameter, and 2.8 mm in inside diameter. Further, a side inlet consisting of a plurality of through holes is provided in a side wall at a distance of 15 cm from this end. Moreover, an outlet consisting of a plurality of parallel linear slits is provided at a distance of 37 cm from the distal inlet of the catheter body.
    Type: Application
    Filed: December 12, 2002
    Publication date: June 17, 2004
    Applicant: PIOLAX MEDICAL DEVICES, INC.
    Inventors: Hiroshi Takahashi, Yasuaki Arai, Hiroshi Inoue
  • Patent number: 6478752
    Abstract: In a catheter guide wire 1 formed of an identical material, since the catheter guide wire 1 consists of a portion 7 having a transformation point and portions 3, 5 not having a transformation point, the body portion 3 will not be excessively flexible and has appropriate rigidity while the connect portion 7 maintains flexibility, so that the power of pressing the catheter guide wire 1 is sufficiently transmitted to the connect portion 7 side from the body portion 3 side, whereby insertion operability of the guide wire 1 is improved.
    Type: Grant
    Filed: June 6, 2001
    Date of Patent: November 12, 2002
    Assignee: Piolax Medical Devices, Inc.
    Inventors: Takeshi Ishikawa, Yukihisa Kurebayashi
  • Patent number: 6391018
    Abstract: The catheter of the present invention includes a tube-shaped catheter main body, a shaping member provided at least at the front end portion of the catheter main body such that the shaping member can impart a winding shape to the front end portion of the catheter, and a cavity portion formed at the inner side of the shaping member.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: May 21, 2002
    Assignee: Piolax Medical Devices, Inc.
    Inventors: Nobuhiko Tanaka, Ichizou Ohkata