Patents by Inventor Pallassana V. Narayanan

Pallassana V. Narayanan 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: 8318235
    Abstract: Medical devices, and in particular implantable medical devices such as stents and stent delivery systems including catheters, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism or to treat a particular condition. A dip coating process is utilized to minimize waste and to customize coating thickness and drug loading directly at the clinical site just prior to therapeutic use on a patient. An aqueous latex polymeric emulsion is utilized to coat any medical device to a desired thickness by allowing for successive dipping and drying cycles at the clinical site. In addition, aqueous latex polymeric emulsions pose less of a chance of the bridging phenomenon associated with organic solvent based polymers.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: November 27, 2012
    Inventors: Harry Halleriet, Pallassana V. Narayanan
  • Patent number: 8182527
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism. The medical devices may be coated with any number of biocompatible materials. Therapeutic drugs, agents or compounds may be mixed with the biocompatible materials and affixed to at least a portion of the medical device. In addition, various polymer combinations as well as other therapeutic agents may be utilized to control the elution rates of the therapeutic drugs, agents and/or compounds from the implantable medical devices.
    Type: Grant
    Filed: June 21, 2004
    Date of Patent: May 22, 2012
    Inventors: Gerard H. Llanos, Pallassana V. Narayanan, George Papandreou
  • Publication number: 20110144737
    Abstract: A biocompatible material may be configured into any number of implantable medical devices including intraluminal stents. Polymeric materials may be utilized to fabricate any of these devices, including stents. The stents may be balloon expandable or self-expanding. By preferential mechanical deformation of the polymer, the polymer chains may be oriented to achieve certain desirable performance characteristics.
    Type: Application
    Filed: December 8, 2010
    Publication date: June 16, 2011
    Inventors: Robert Burgermeister, Joseph H. Contiliano, Vipul Dave, Yufu Li, Pallassana V. Narayanan, David W. Overaker, Qiang Zhang
  • Patent number: 7914573
    Abstract: A biocompatible material may be configured into any number of implantable medical devices including intraluminal stents. Polymeric materials may be utilized to fabricate any of these devices, including stents. The stents may be balloon expandable or self-expanding. By preferential mechanical deformation of the polymer, the polymer chains may be oriented to achieve certain desirable performance characteristics.
    Type: Grant
    Filed: May 25, 2006
    Date of Patent: March 29, 2011
    Assignee: Cordis Corporation
    Inventors: Robert Burgermeister, Joseph H. Contiliano, Vipul Dave, Yufu Li, Pallassana V. Narayanan, David W. Overaker, Qiang Zhang
  • Publication number: 20090082855
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism. The medical devices may be coated with any number of biocompatible materials. Therapeutic drugs, agents or compounds may be mixed with the biocompatible materials and affixed to at least a portion of the medical device. These therapeutic drugs, agents or compounds may also further reduce a biological organism's reaction to the introduction of the medical device to the organism. In addition, these therapeutic drugs, agents and/or compounds may be utilized to promote healing, including the formation of blood clots. Also, the devices may be modified to promote endothelialization. In addition, various polymer combinations may be utilized to control the elution rates of the therapeutic drugs, agents and/or compounds from the implantable medical devices.
    Type: Application
    Filed: December 3, 2008
    Publication date: March 26, 2009
    Inventors: John Borges, Maritza Carballo, Pallassana V. Narayanan, William D. Shaw, JR., Christopher W. Widenhouse
  • Publication number: 20070202146
    Abstract: A biocompatible material may be configured into any number of implantable medical devices including intraluminal stents. Polymeric materials may be utilized to fabricate any of these devices, including stents. The stents may be balloon expandable or self-expanding. The polymeric materials may include additives such as drugs or other bioactive agents as well as radiopaque agents. By preferential mechanical deformation of the polymer, the polymer chains may be oriented to achieve certain desirable performance characteristics.
    Type: Application
    Filed: February 24, 2006
    Publication date: August 30, 2007
    Inventors: Robert Burgermeister, Vipul Dave, Pallassana V. Narayanan, David W. Overaker
  • Patent number: 7056550
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism. The medical devices may be coated with any number of biocompatible materials. Therapeutic drugs, agents or compounds may be mixed with the biocompatible materials and affixed to at least a portion of the medical device. These therapeutic drugs, agents or compounds may also further reduce a biological organism's reaction to the introduction of the medical device to the organism. Various materials and coating methodologies may be utilized to maintain the drugs, agents or compounds on the medical device until delivered and positioned.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: June 6, 2006
    Assignee: Ethicon, Inc. - USA
    Inventors: Luis A. Davila, David Christian Lentz, Gerard H. Llanos, Jorge Orlando Mendez, Pallassana V. Narayanan, Alan Roy Pelton, Mark B. Roller, Karl K. Scheidt, Angelo George Scopelianos, William Douglas Shaw, Jr., James H. Silver, John Spaltro, Christine Trepanier, David J. Wilson
  • Patent number: 6919100
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism or to treat a particular condition. A dip coating process is utilized to minimize waste. An aqueous latex polymeric emulsion is utilized to coat any medical device to a desired thickness by allowing for successive dipping and drying cycles. In addition, aqueous latex polymeric emulsions pose less of a chance of the bridging phenomenon associated with organic solvent based polymers.
    Type: Grant
    Filed: January 22, 2003
    Date of Patent: July 19, 2005
    Assignee: Cordis Corporation
    Inventor: Pallassana V. Narayanan
  • Publication number: 20040142094
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism or to treat a particular condition. A dip coating process is utilized to minimize waste. An aqueous latex polymeric emulsion is utilized to coat any medical device to a desired thickness by allowing for successive dipping and drying cycles. In addition, aqueous latex polymeric emulsions pose less of a chance of the bridging phenomenon associated with organic solvent based polymers.
    Type: Application
    Filed: January 22, 2003
    Publication date: July 22, 2004
    Inventor: Pallassana V. Narayanan
  • Publication number: 20040102758
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism. The medical devices may be coated with any number of biocompatible materials. Therapeutic drugs, agents or compounds may be mixed with the biocompatible materials and affixed to at least a portion of the medical device. These therapeutic drugs, agents or compounds may also further reduce a biological organism's reaction to the introduction of the medical device to the organism. Various materials and coating methodologies may be utilized to maintain the drugs, agents or compounds on the medical device until delivered and positioned.
    Type: Application
    Filed: August 7, 2003
    Publication date: May 27, 2004
    Inventors: Luis A. Davila, David Christian Lentz, Gerard H. Llanos, Jorge Orlando Mendez, Pallassana V. Narayanan, Alan Roy Pelton, Mark B. Roller, Karl K. Scheidt, Angelo George Scopelianos, William Douglas Shaw, James H. Silver, John Spaltro, Christine Trepanier, David J. Wilson
  • Patent number: 6468244
    Abstract: At least a portion of a catheter system (10) is provided with fullerene material (56) for performing or facilitating a medical procedure. In the case of a balloon catheter, the outer surface of the balloon may have a coating of fullerenes (64), which are preferably photosensitive or activated by light. A light source (60) can be used to illuminate or other wise activate the fullerene material. The light source (60) may be formed by one or more optical fibers extending through the shaft of the catheter, and into the balloon. Various arrangements of the catheter system are possible, whereby the light source may selectively emit light outward through the fullerene material, and associated portions of the catheter system, which may be translucent. When activated by light, the fullerene coating may preferably generate, and give off therapeutic oxygen radicals. These oxygen radicals may affect local cell function to prevent or reduce cell proliferation.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: October 22, 2002
    Inventors: James E. Leone, Pallassana V. Narayanan
  • Publication number: 20020111590
    Abstract: Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism. The medical devices may be coated with any number of biocompatible materials. Therapeutic drugs, agents or compounds may be mixed with the biocompatible materials and affixed to at least a portion of the medical device. These therapeutic drugs, agents or compounds may also further reduce a biological organism's reaction to the introduction of the medical device to the organism. Various materials and coating methodologies may be utilized to maintain the drugs, agents or compounds on the medical device until delivered and positioned.
    Type: Application
    Filed: September 25, 2001
    Publication date: August 15, 2002
    Inventors: Luis A. Davila, David Christian Lentz, Gerard H. Llanos, Jorge Orlando Mendez, Pallassana V. Narayanan, Alan Roy Pelton, Mark B. Roller, Karl K. Scheidt, Angelo George Scopelianos, William Douglas Shaw, James H. Silver, John Spaltro, Christine Trepanier, David J. Wilson
  • Publication number: 20010029351
    Abstract: An intralumen medical device comprising anti-proliferative and anti-thrombotic or anti-coagulant drugs, agents or compounds may be utilized in the treatment of vascular disease. The intralumen medical device is selectively coated with the drugs, agents or compounds for local delivery, thereby increasing their effectiveness and reducing potential toxicity associated with systemic use. The selective coating is utilized to ensure that the specific drugs, agents or compounds come into contact with or are delivered to the appropriate tissues and/or fluids for maximum effectiveness.
    Type: Application
    Filed: May 7, 2001
    Publication date: October 11, 2001
    Inventors: Robert Falotico, Gregory A. Kopia, George Landau, Gerard H. Llanos, Pallassana V. Narayanan, George Papandreou
  • Patent number: 6171232
    Abstract: The preparation and use of medical devices are described. A thiol group agent is loaded onto a medical device such as a stent or a catheter. Preferably, the loading is accomplished onto a polymeric surface that had been activated by water vapor RF plasma treatment. The thiol group agent is structured to exhibit sulfhydryl groups. These sulfhydryl groups are available for interaction with NO carriers such as nitrovasodilators. This interaction can take place in situ at an in vivo location within a vascular system, for example, in which event the sulfhydryl groups would be delivered by the medical device while the NO carrier will be delivered by suitable pharmaceutical administration means. Alternatively, the NO carrier can be loaded onto the treated medical device surface at a suitable time prior to insertion of the medical device into the body, such as immediately before the initiation of a medical procedure such as stent delivery and implantation.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: January 9, 2001
    Assignee: Cordis Corporation
    Inventors: George Papandreou, Pallassana V. Narayanan
  • Patent number: 5591140
    Abstract: Polymeric surfaces of medical devices or components of medical devices are provided that have enhanced biocompatibility properties. The polymeric surface presents an anti-thrombogenic, fibrinolytic or thrombolytic interface with body fluids such as blood during implantation or medical procedures. The biocompatibility enhancing agent is secured to the polymeric substrate by a spacer molecule which is covalently bound to the polymeric substrate which had been subjected to radiofrequency plasma treatment with a water vapor medium.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: January 7, 1997
    Assignee: Cordis Corporation
    Inventors: Pallassana V. Narayanan, Kimberly D. Stanley
  • Patent number: 5486357
    Abstract: Internal polymeric surfaces of medical devices are provided that have enhanced biocompatibility properties. The internal polymeric surface presents an anti-thrombogenic, fibrinolytic or thrombolytic interface with body fluids such as blood flowing through medical device tubing during implantation for medical procedures. The biocompatibility enhancing agent is secured to the polymeric substrate by a spacer molecule which is covalently bound to the internal polymeric surface which had been subjected to radiofrequency plasma treatment with a low pressure plasma medium of water vapor, oxygen or combination of water vapor and oxygen gas.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: January 23, 1996
    Assignee: Cordis Corporation
    Inventor: Pallassana V. Narayanan
  • Patent number: 5409696
    Abstract: Polymeric surfaces of medical devices or components of medical devices are provided that have enhanced biocompatibility properties. The polymeric surface presents an anti-thrombogenic, fibrinolytic or thrombolytic interface with body fluids such as blood during implant ation or medical procedures. The biocompatibility enhancing agent is secured to the polymeric substrate by a spacer molecule which is covalently bound to the polymeric substrate which had been subjected to radiofrequency plasma treatment with a water vapor medium.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: April 25, 1995
    Assignee: Cordis Corporation
    Inventors: Pallassana V. Narayanan, Kimberly D. Stanley
  • Patent number: 5336518
    Abstract: A treatment for metallic surfaces and devices having metallic surfaces is described. A film of heptafluorobutylmethacrylate (HFBMA) is applied to a surface by radiofrequency (RF) plasma deposition and subsequently treated with a biologically active agent. A water vapor RF plasma treatment of the HFBMA coating provides reactive groups thereon which can covalently bond to the biologically active agent. Alternatively, a spacer group can be bonded to the activated HFBMA and the biologically active agent can then be bonded to the spacer group. Devices coated according to the invention possess enhanced biocompatibility and the HFBMA coatings are durable even under severe crimping and expansion conditions.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: August 9, 1994
    Assignee: Cordis Corporation
    Inventors: Pallassana V. Narayanan, Stephen M. Rowland, Kimberly D. Stanley
  • Patent number: 5244654
    Abstract: Internal polymeric surfaces of medical devices are provided that have enhanced biocompatibility properties. The internal polymeric surface presents an anti-thrombogenic, fibrinolytic or thrombolytic interface with body fluids such as blood flowing through medical device tubing during implantation for medical procedures. The biocompatibility enhancing agent is secured to the polymeric substrate by a spacer molecule which is covalently bound to the internal polymeric surface which had been subjected to radiofrequency plasma treatment with a low pressure plasma medium of water vapor, oxygen or combination of water vapor and oxygen gas.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: September 14, 1993
    Assignee: Cordis Corporation
    Inventor: Pallassana V. Narayanan
  • Patent number: 5132108
    Abstract: Polymeric surfaces of medical devices or components of medical devices are provided that have enhanced biocompatibility properties. The polymeric surface presents an anti-thrombogenic, fibrinolytic or thrombolytic interface with body fluids such as blood during implantation or medical procedures. The biocompatibility enhancing agent is secured to the polymeric substrate by a spacer molecule which is covalently bound to the polymeric substrate which had been subjected to radiofrequency plasma treatment with a water vapor medium.
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: July 21, 1992
    Assignee: Cordis Corporation
    Inventors: Pallassana V. Narayanan, Kimberly D. Stanley