Patents by Inventor Takuji Nishide

Takuji Nishide 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: 11123528
    Abstract: A balloon catheter includes a shaft and a balloon having one or more fold lines. The balloon is disposed outside the shaft, and the balloon includes one or more first regions and one or more second regions. The first region retains medicine on an outer surface of the balloon. The second region retains less medicine than the first region or retains no medicine.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: September 21, 2021
    Assignee: KANEKA CORPORATION
    Inventors: Soichiro Kita, Masao Sato, Hitoshi Tahara, Ryoji Nakano, Motokazu Watanabe, Takuji Nishide
  • Patent number: 10967157
    Abstract: A balloon catheter includes a shaft, and a balloon provided outside the shaft. A drug is provided on an outer surface of the balloon, and the balloon has at least a straight tube part. A change ratio of an outer diameter of the straight tube part, (D28?D24)/D24, is 1.1% or less. D24 is the outer diameter of the straight tube part when an internal pressure of 2.43 MPa (24 atm) is applied, and D28 is the outer diameter of the straight tube part when an internal pressure of 2.84 MPa (28 atm) is applied.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: April 6, 2021
    Assignee: KANEKA CORPORATION
    Inventors: Masao Sato, Soichiro Kita, Hitoshi Tahara, Ryoji Nakano, Motokazu Watanabe, Takuji Nishide
  • Publication number: 20190134360
    Abstract: A balloon catheter includes a shaft, and a balloon provided outside the shaft. A drug is provided on an outer surface of the balloon, and the balloon has at least a straight tube part. A change ratio of an outer diameter of the straight tube part, (D28?D24)/D24, is 1.1% or less. D24 is the outer diameter of the straight tube part when an internal pressure of 2.43 MPa (24 atm) is applied, and D28 is the outer diameter of the straight tube part when an internal pressure of 2.84 MPa (28 atm) is applied.
    Type: Application
    Filed: January 4, 2019
    Publication date: May 9, 2019
    Applicant: KANEKA CORPORATION
    Inventors: Masao Sato, Soichiro Kita, Hitoshi Tahara, Ryoji Nakano, Motokazu Watanabe, Takuji Nishide
  • Publication number: 20190134359
    Abstract: A balloon catheter includes a shaft and a balloon having one or more fold lines. The balloon is disposed outside the shaft, and the balloon includes one or more first regions and one or more second regions. The first region retains medicine on an outer surface of the balloon. The second region retains less medicine than the first region or retains no medicine.
    Type: Application
    Filed: January 4, 2019
    Publication date: May 9, 2019
    Applicant: KANEKA CORPORATION
    Inventors: Soichiro Kita, Masao Sato, Hitoshi Tahara, Ryoji Nakano, Motokazu Watanabe, Takuji Nishide
  • Patent number: 9149604
    Abstract: There has been a demand for an aspiration catheter which has a sufficient amount of aspiration, which is sufficiently flexible to satisfactorily track tortuous blood vessels, in which the possibility of kinking of a catheter shaft is decreased when the aspiration catheter is inserted into a guiding catheter from outside of the body, and in which good operationality is achieved. An aspiration catheter of the present invention includes an aspiration lumen for removing a substance by aspiration, the aspiration lumen extending to a hub provided at the proximal end of the catheter; and a detachable core wire disposed in the aspiration lumen.
    Type: Grant
    Filed: October 26, 2004
    Date of Patent: October 6, 2015
    Assignee: KANEKA CORPORATION
    Inventors: Takuji Nishide, Masato Hashiba, Shogo Miki
  • Patent number: 8105259
    Abstract: The present invention provides a catheter for extraction that can efficiently extract blood flowing in coronary sinus from coronary artery through coronary vein and has the same operability as catheters used in conventional PCI. The present invention also provides a catheter for extracorporeal circulation that can lessen an introduction number of devices for blood access as little as possible and reduce further the burden to a patient, in addition to the same operability as the catheters used in the conventional PCI. The catheter for extraction is equipped with blood extracting lumen in an inside and equipped with a hub at a proximal end portion, and when a minimum sectional area to a circumferential direction of the blood extracting lumen is referred to as S1 and immersion side length is referred to as L1, an equivalent diameter D1 satisfies the formula defined by D1=(4×S1)/L1 and the equivalent diameter D1 is at 1.80 mm.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: January 31, 2012
    Assignee: Kaneka Corporation
    Inventors: Ichiro Michishita, Takuji Nishide
  • Patent number: 8088121
    Abstract: A catheter enabling an increase in operability when the catheter is inserted from the outside to the inside of a body and capable of remarkably reducing the risk of damage to shafts even in an unforeseen accident without complicating steps and increasing production cost. The catheter comprises at least the distal side shaft formed of a resin tube, the rear end side shaft with a higher rigidity than that of the distal side shaft, and a guide wire lumen. The catheter is characterized in that a core wire is disposed therein to adjust a flexibility so that the rear end portion of the distal side shaft is harder than the distal end portion of the distal side shaft and softer than the rear end side shaft, and the core wire is fixed to the distal side shaft near the rear end side opening part of the guide wire lumen and at a part of the rear end side portion of the distal end shaft.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: January 3, 2012
    Assignee: Kaneka Corporation
    Inventors: Takuji Nishide, Osamu Kikugawa, Shogo Miki
  • Publication number: 20090287135
    Abstract: The present invention provides a catheter for extraction that can efficiently extract blood flowing in coronary sinus from coronary artery through coronary vein and has the same operability as catheters used in conventional PCI. The present invention also provides a catheter for extracorporeal circulation that can lessen an introduction number of devices for blood access as little as possible and reduce further the burden to a patient, in addition to the same operability as the catheters used in the conventional PCI. The catheter for extraction is equipped with blood extracting lumen in an inside and equipped with a hub at a proximal end portion, and when a minimum sectional area to a circumferential direction of the blood extracting lumen is referred to as S1 and immersion side length is referred to as L1, an equivalent diameter D1 satisfies the formula defined by D1=(4×S1)/L1 and the equivalent diameter D1 is at 1.80 mm.
    Type: Application
    Filed: February 21, 2006
    Publication date: November 19, 2009
    Applicant: KANEKA CORPORATION
    Inventors: Ichiro Michishita, Takuji Nishide
  • Publication number: 20090270802
    Abstract: A catheter enabling an increase in operability when the catheter is inserted from the outside to the inside of a body and capable of remarkably reducing the risk of damage to shafts even in an unforeseen accident without complicating steps and increasing production cost. The catheter comprises at least the distal side shaft formed of a resin tube, the rear end side shaft with a higher rigidity than that of the distal side shaft, and a guide wire lumen. The catheter is characterized in that a core wire is disposed therein to adjust a flexibility so that the rear end portion of the distal side shaft is harder than the distal end portion of the distal side shaft and softer than the rear end side shaft, and the core wire is fixed to the distal side shaft near the rear end side opening part of the guide wire lumen and at a part of the rear end side portion of the distal end shaft.
    Type: Application
    Filed: July 29, 2005
    Publication date: October 29, 2009
    Applicant: KANEKA CORPORATION
    Inventors: Takuji Nishide, Osamu Kikugawa, Shogo Miki
  • Publication number: 20090270801
    Abstract: A catheter having a proximal shaft and a distal shaft each having a proximal end section and a distal end section. The distal end of the proximal shaft and the proximal end of the distal shaft are connected to each other, a catheter holding hub is connected to the proximal end of the proximal shaft, and a part of at least the distal shaft is constructed from an inner shaft and an outer shaft coaxially surrounding the inner shaft. The inner shaft is extended out from the outer shaft to the distal side. The lumen of the inner shaft forms a guidewire lumen. The catheter has a means for restricting relative movement of the outer shaft and the inner shaft occurring when pressing force exceeding a predetermined level is applied to the catheter.
    Type: Application
    Filed: April 5, 2006
    Publication date: October 29, 2009
    Applicant: KANEKA CORPORATION
    Inventors: Tamotsu Shimada, Masayuki Takatera, Takuji Nishide
  • Publication number: 20090192494
    Abstract: A catheter for blood removal that is to be provided in the coronary sinus via the inferior vena cava to remove the blood in the coronary sinus from the body wherein: the catheter for blood removal has a straight back end shaft, a curved front end shaft connected in the front end side of the back end shaft, a hub connected in the back end side of the back end shaft and a blood removal lumen extending from the back end of the catheter for blood removal to the front end thereof; the front end shaft comprises a first straight part, a first curve part following the first straight part, a second curve part following the first curve part, a second straight part following the second curve part, a third curve part following the second straight part and a third curve part following the third straight part.
    Type: Application
    Filed: March 23, 2007
    Publication date: July 30, 2009
    Applicant: KANEKA CORPORATION
    Inventors: Ichiro Michishita, Takuji Nishide
  • Publication number: 20090030362
    Abstract: The present invention aims to provide a contrast agent-removal system and a method of operating the system for efficiently removing the contrast agent which is cause of the renal function impairment. The system of the present invention includes a blood suction catheter which can be placed into the coronary sinus, a column for removing a contrast agent from the drawn blood, a blood drawing circuit for directing the blood into the column, a blood pump for controlling an amount of the drawn blood, a blood return circuit for returning the blood from which the contrast agent is removed to a patient's body and a device for measuring a blood suction pressure. In the method of operating the system, the blood is drawn with the blood suction catheter placed into the coronary sinus and the drawing blood is contacted with an adsorbent for adsorbing the contrast agent.
    Type: Application
    Filed: February 21, 2006
    Publication date: January 29, 2009
    Applicant: KANEKA CORPORATION
    Inventors: Ichiro Michishita, Zenzo Fujii, Sakiko Hanita, Eiji Ogino, Takuji Nishide
  • Publication number: 20080077232
    Abstract: Disclosed is an easy-to-manufacture stent for placement in a body having a coating layer composed of a polymer wherein separation or cracking of the coating layer due to expansion of the stent can be efficiently prevented. Specifically disclosed is a stent for placement in a body which comprises a coating layer composed of a polymer and an intermediate layer arranged between the coating layer and the surface of the stent and composed of a polymer having a higher weight average molecular weight than the polymer of the coating layer. The polymers are preferably biodegradable, and able to contain a medical agent.
    Type: Application
    Filed: September 1, 2005
    Publication date: March 27, 2008
    Applicant: KANEKA CORPORATION
    Inventor: Takuji Nishide
  • Publication number: 20070250157
    Abstract: It is intended to easily provide a stent for placement in body which can hold an increased amount of a drug without causing cracking or peeling in the coating layer with the dilation of the stent and from which the drug can be sustainedly released as far as possible. Namely, a stent for placement in body having a coating layer mainly comprising a drug and a polymer in at least a part of the stent surface wherein the coating layer consists of an inner layer and an outer layer, the weight ratio of drug/polymer, which is defined based on the weights of the drug and the polymer contained in each layer, of the inner layer is higher than that of the outer layer, and the outer layer contains an efficacious amount of the drug.
    Type: Application
    Filed: September 1, 2005
    Publication date: October 25, 2007
    Applicant: KANEKA CORPORATION
    Inventors: Takuji Nishide, Yuki Takiguchi, Ryoji Nakano, Kohei Fukaya, Masaji Kawatsu
  • Publication number: 20070191812
    Abstract: There has been a demand for an aspiration catheter which has a sufficient amount of aspiration, which is sufficiently flexible to satisfactorily track tortuous blood vessels, in which the possibility of kinking of a catheter shaft is decreased when the aspiration catheter is inserted into a guiding catheter from outside of the body, and in which good operationality is achieved. An aspiration catheter of the present invention includes an aspiration lumen for removing a substance by aspiration, the aspiration lumen extending to a hub provided at the proximal end of the catheter; and a detachable core wire disposed in the aspiration lumen.
    Type: Application
    Filed: October 26, 2004
    Publication date: August 16, 2007
    Inventors: Takuji Nishide, Masato Hashiba, Shogo Miki
  • Patent number: 7247147
    Abstract: The medical balloon catheter of the present invention comprises a catheter shaft composed of a distal end shaft and a proximal end shaft and a balloon on the distal end of the distal end shaft, wherein the proximal end shaft is composed of a single member and the distal end portion of the proximal end shaft is lower in rigidity than the other parts thereof. The present invention also provides a medical balloon catheter having a structure in which a tube for passing a guidewire inside thereof is arranged so as to pass inside the balloon and the balloon and tube are fused together in the vicinity of the distal end of the catheter, wherein the ratio of the outer diameter of the small-diameter portion on the distal end side of the tube to the outer diameter of the proximal end portion is no less than 0.85.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: July 24, 2007
    Assignee: Kaneka Corporation
    Inventors: Takuji Nishide, Kohei Fukaya, Masato Hashiba
  • Patent number: 7244250
    Abstract: Provided is an aspiration catheter which does not require a large-scale device, has a largest possible aspiration lumen, and is sufficiently flexible to track tortuous blood vessels following a guidewire, thereby being easily advanced to a target site to be treated. In the aspiration catheter, the tip of the main shaft is obliquely cut, the distal end of the guidewire shaft is positioned at the distal end of the main shaft or protrudes from the distal end of the main shaft in the distal direction, and the relationships 0.5?L2/L1 and L2?L1?5 mm are satisfied, wherein L1 is the length of the obliquely cut portion of the main shaft in the longitudinal direction of the catheter, and L2 is the length from the proximal end of the guidewire shaft to the distal end of the main shaft.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: July 17, 2007
    Assignee: Kaneka Corporation
    Inventors: Shogo Miki, Takuji Nishide, Masayuki Takatera, Sakiko Hanita
  • Publication number: 20070038289
    Abstract: As a treatment for angiostenosis, angioplasty (PTA or PTCA) of expanding a small-sized balloon in a vessel has been commonly conducted. However, this treatment easily causes repeated stenosis (restenosis) after the treatment. Placement of a stent in a vessel is also effective in decreasing restenosis, but this treatment may also cause restenosis. The present invention provides a stent containing a poly (lactide-co-glycolide) or both a poly (lactide-co-glycolide) and an immunosuppressive agent in at least a portion of a surface of the stent, and further containing a material nondegradable in vivo.
    Type: Application
    Filed: July 23, 2004
    Publication date: February 15, 2007
    Applicant: KANEKA CORPORATION
    Inventors: Takuji Nishide, Ryoji Nakano, Shinya Yoshida, Kohei Fukaya, Masaji Kawatsu
  • Publication number: 20050267494
    Abstract: An embolization device which is placed at a definite position in a vessel cavity in vivo to embolize the vessel cavity. More specifically speaking, an embolization device to be used for plugging a blood vessel or a aneurysm formed in a blood vessel. After being placed in a vessel cavity in vivo, this embolization device promotes not only thrombosis but also organization over the surrounding area, thereby exerting an excellent embolization effect on the vessel cavity. Namely, an embolization device for plugging a vessel cavity in vivo characterized by having biological response modifiers (BRM) which can promote organization and exert an enhanced embolization effect after being placed in a vessel cavity in vivo.
    Type: Application
    Filed: September 9, 2003
    Publication date: December 1, 2005
    Inventors: Hiroo Iwata, Takuji Nishide
  • Patent number: 6960186
    Abstract: The present invention is a balloon catheter used primarily in treatment and surgery for the purpose of dilating lesion sites such as strictures or blockages in passages in the human body. The balloon catheter of the present invention has a structure wherein a guide wire passing tubular member is deployed passing through the interior of the expansion body, and the outer surface of the tubular member and the expansion body are concentrically fused near the distal end of the catheter. This is a balloon catheter that is characterized by the fact that the Shore hardness of the material configuring the outermost surface of the tubular member is smaller than the Shore hardness of the material configuring the expansion body. It is therefore possible to flexibly adjust the tip portion formed by securing the expansion body and the guide wire passing tubular member.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: November 1, 2005
    Assignee: Kaneka Corporation
    Inventors: Kohei Fukaya, Takuji Nishide, Ryoji Nakano, Hiromi Maeda, Shogo Miki