Patents by Inventor David N. Armstrong

David N. Armstrong 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: 10337030
    Abstract: A method for producing metal chalcogenide nanoparticles, the method comprising: (i) producing hydrogen chalcogenide-containing vapor from a microbial source, wherein said microbial source comprises: (a) chalcogen-reducing microbes capable of producing hydrogen chalcogenide vapor from a chalcogen-containing source; (b) a culture medium suitable for sustaining said chalcogen-reducing microbes; (c) at least one chalcogen-containing compound that can be converted to hydrogen chalcogenide vapor by said chalcogen-reducing microbes; and (d) at least one nutritive compound that provides donatable electrons to said chalcogen-reducing microbes during consumption of the nutritive compound by said chalcogen-reducing microbes; and (ii) directing said hydrogen chalcogenide-containing vapor into a metal-containing solution comprising a metal salt dissolved in a solvent to produce metal chalcogenide nanoparticles in said solution, wherein said chalcogen is sulfur or selenium, and said chalcogenide is sulfide or selenide, res
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: July 2, 2019
    Assignees: UT-Battelle, LLC, U.S. Geological Survey
    Inventors: Ji Won Moon, Tommy Joe Phelps, Ronald Oremland, David E. Graham, Ilia N. Ivanov, Christopher B. Jacobs, Gyoung Gug Jang, Michelle K. Kidder, Pooran C. Joshi, Beth L. Armstrong
  • Patent number: 9526484
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. The graft may have a curved, generally conical shape with a trumpet-like head end that continuously tapers to a smaller tail end. The graft may be an integral unit made of a single material, such as a heterograft material. Methods of closing single and multiple fistulae are also provided.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: December 27, 2016
    Assignee: COOK MEDICAL TECHNOLOGIES LLC
    Inventor: David N. Armstrong
  • Patent number: 9521996
    Abstract: Systems, devices, and methods capable of retracting organs are disclosed. In one embodiment, a retractor body comprises a deformable resilient frame defining a central opening and a deformable membrane extending across a portion of the central opening wherein the deformable resilient frame is arranged for complete disposal within the body of a patient and for varying the size of the central opening. In some exemplary embodiments, the retractor is arranged to form a helically coiled arrangement for insertion into the body of a patient. Delivery devices for delivering a deformable resilient retractor and methods of delivery are also disclosed.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: December 20, 2016
    Assignee: Cook Medical Technologies LLC
    Inventor: David N. Armstrong
  • Patent number: 9456815
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: October 4, 2016
    Assignees: COOK MEDICAL TECHNOLOGIES LLC, COOK BIOTECH INCORPORATED
    Inventors: David N. Armstrong, Brian L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Publication number: 20140364902
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Application
    Filed: August 21, 2014
    Publication date: December 11, 2014
    Inventors: David N. Armstrong, Brian L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Publication number: 20140358167
    Abstract: An anastomotic sleeve or “cup” protection device incorporating distal and proximal sleeves or “cups”, also incorporating a staple-line buttress. The proximal colon is inserted into the proximal sleeve or cup and the shaft of the stapler anvil is passed through a hole in the closed end of the sleeve or cup. The distal sleeve or cup is placed over the head of the staple shaft, and inserted into the rectum for anastomosis. Closure and firing of the stapler creates a staple buttress line at the anastomosis, the proximal sleeve prevents leakage from the proximal colon and the distal sleeve protects the distal colon or rectum from anastomotic leak.
    Type: Application
    Filed: May 28, 2014
    Publication date: December 4, 2014
    Inventor: David N. Armstrong
  • Patent number: 8840917
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: September 23, 2014
    Assignees: Cook Medical Technologies LLC, Cook Biotech Incorporated
    Inventors: David N. Armstrong, Brian L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Publication number: 20140257376
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. The graft may have a curved, generally conical shape with a trumpet-like head end that continuously tapers to a smaller tail end. The graft may be an integral unit made of a single material, such as a heterograft material. Methods of closing single and multiple fistulae are also provided.
    Type: Application
    Filed: May 20, 2014
    Publication date: September 11, 2014
    Applicant: Cook Medical Technologies LLC
    Inventor: David N. Armstrong
  • Patent number: 8764791
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. The graft may have a curved, generally conical shape with a trumpet-like head end that continuously tapers to a smaller tail end. The graft may be an integral unit made of a single material, such as a heterograft material. Methods of closing single and multiple fistulae are also provided.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: July 1, 2014
    Assignee: Cook Medical Technologies LLC
    Inventor: David N. Armstrong
  • Publication number: 20130304119
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Application
    Filed: July 15, 2013
    Publication date: November 14, 2013
    Inventors: David N. Armstrong, Brian L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Publication number: 20130237816
    Abstract: A method of occluding a defect in a patient is provided. The method includes inserting a placement member, such as a wire guide, into a defect; advancing the placement member to a desired location; inserting the placement member into a lumen in an occluding member, such as a plug or a graft; and advancing the occluding member to the desired location by inserting the placement member into a lumen in a pusher member and pushing the occluding member with the pusher member until the occluding member reaches the desired location. Medical devices and systems for occluding defects are also provided.
    Type: Application
    Filed: April 19, 2013
    Publication date: September 12, 2013
    Applicant: Cook Medical Technologies LLC
    Inventor: David N. Armstrong
  • Patent number: 8501217
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: August 6, 2013
    Assignees: Cook Medical Technologies LLC, Cook Biotech Incorporated
    Inventors: David N. Armstrong, Brain L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Publication number: 20130018228
    Abstract: Systems, devices, and methods capable of retracting organs are disclosed. In one embodiment, a retractor body comprises a deformable resilient frame defining a central opening and a deformable membrane extending across a portion of the central opening wherein the deformable resilient frame is arranged for complete disposal within the body of a patient and for varying the size of the central opening. In some exemplary embodiments, the retractor is arranged to form a helically coiled arrangement for insertion into the body of a patient. Delivery devices for delivering a deformable resilient retractor and methods of delivery are also disclosed.
    Type: Application
    Filed: July 13, 2012
    Publication date: January 17, 2013
    Inventor: David N. Armstrong
  • Publication number: 20110172495
    Abstract: A biocompatible deformable retractor provides desired advanced organ retaining during surgical procedures. The retractor is generally self-retaining once deployed and provides surgical field without the interference from the retained organs. The deployed retractor may adopt convex, planar, or concave configurations inside a body cavity. The retractor comprises a deformable resilient frame and a deformable membrane, is approximately planar or a non-planar convex shape in its natural un-deformed configuration. The membrane can be transparent to provide additional viewing capability of the retained organs.
    Type: Application
    Filed: March 23, 2011
    Publication date: July 14, 2011
    Inventor: David N. Armstrong
  • Publication number: 20110125289
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Application
    Filed: February 1, 2011
    Publication date: May 26, 2011
    Applicant: Cook Biotech Incorporated
    Inventors: David N. Armstrong, Brain L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Patent number: 7897167
    Abstract: An implantable graft, which may be inserted into a fistula tract to occlude the primary opening of the fistula, is provided. To prevent unintentional displacement of the graft or extrusion of the graft from the fistula of a patient, the graft may be provided with a cap that extends laterally from at least one end of the body of the graft, where the cap may be integral with the body of the graft, attachable to at least one end of the body of the graft, and/or moveable along the body of the graft. The graft may also have a tail that extends from one end of the body of the graft to assist in placement of the graft in a fistula tract. The graft may be an integral unit made of a single material, such as a heterograft material, or may include distinct components made of the same or different materials. Methods for closing a fistula tract are also provided.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: March 1, 2011
    Assignees: Cook Incorporated, Cook Biotech Incorporated
    Inventors: David N. Armstrong, Brian L. Bates, Mark W. Bleyer, F. Joseph Obermiller, Umesh H. Patel
  • Patent number: 7645229
    Abstract: A fiber-optic endoscopic instrument (Fistuloscope) is used to visualize anorectal fistula, and to accurately identify the course through the fistula. The instrument can be used to flush the fistula, to close the fistula tract by means of injecting sealants or placing grafts in the tract of the fistula or to pass setons, micro-instruments or other means to treat and seal the tract.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: January 12, 2010
    Inventor: David N. Armstrong
  • Patent number: 7037314
    Abstract: A hemorrhoidal ligator and anoscope system used to facilitate ligation of internal hemorrhoids. The ligating device consists of head, shaft and firing handle assemblies and is capable of storing and releasing multiple rubber bands singularly. The ligating device comprises an inner cylinder that is removable for disposal or reloading for reuse. The inner cylinder may also be configured with a disposable sleeve, the sleeve being disposable or capable of reloading. A modified loading cone is provided for facilitating loading of the rubber bands onto the inner cylinder or the inner cylinder sleeve 9. The anoscope is configured with three lateral apertures that coincide with the anatomic locations of the internal hemorrhoids in man and thus, simultaneously expose all three hemorrhoids for ligation and grading.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: May 2, 2006
    Inventor: David N. Armstrong
  • Patent number: 6577240
    Abstract: A pair of sensors (20A and 20B) are mounted at the entrance to a germ sensitive area. When a person enters the area the sensors are activated in sequence, indicating the direction of movement of the person. An indicator, such as a light or sound alarm is mounted upon an antiseptic dispenser, located within the area. The alarm is actuated by the movement and is de-activated once antiseptic is dispensed from the unit. Likewise when the person moves out of the germ sensitive area, the alarm on a dispenser unit located outside the area is energized and is de-activated upon dispensing of antiseptic.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: June 10, 2003
    Inventor: David N. Armstrong
  • Publication number: 20020111639
    Abstract: A hemorrhoidal ligator and anoscope system used to facilitate ligation of internal hemorrhoids. The ligating device consists of head, shaft and firing handle assemblies and is capable of storing and releasing multiple rubber bands singularly. The ligating device comprises an inner cylinder that is removable for disposal or reloading for reuse. The inner cylinder may also be configured with a disposable sleeve, the sleeve being disposable or capable of reloading. A modified loading cone is provided for facilitating loading of the rubber bands onto the inner cylinder or the inner cylinder sleeve 9. The anoscope is configured with three lateral apertures that coincide with the anatomic locations of the internal hemorrhoids in man and thus, simultaneously expose all three hemorrhoids for ligation and grading.
    Type: Application
    Filed: April 12, 2002
    Publication date: August 15, 2002
    Inventor: David N. Armstrong