Patents by Inventor David O. Williams

David O. Williams 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: 7083633
    Abstract: An improved arterial catheter device for capturing emboli within the aorta and other arteries is described. The system typically includes an elongated catheter member bearing a filtration apparatus disposed at its the distal region, comprising a filter membrane and a mechanism for deploying and collapsing the filter. For reliable deployment, the deployment mechanism comprises at least one pair of struts, one being a compression strut and the other a tension strut. In use, the catheter is positioned so that the filter membrane is down stream from the possible embolic source and upstream from any vital organs of concern. When deployed the filter membrane will capture emboli from the blood stream, and upon filter removal will extract the emboli from the patient.
    Type: Grant
    Filed: September 3, 2003
    Date of Patent: August 1, 2006
    Assignee: Advanced Vascular Technologies LLC
    Inventors: Richard J Morrill, John R. Fagan, David O. Williams
  • Publication number: 20040073253
    Abstract: An improved arterial catheter device for capturing emboli within the aorta and other arteries is described. The system typically includes an elongated catheter member bearing a filtration apparatus disposed at its the distal region, comprising a filter membrane and a mechanism for deploying and collapsing the filter. For reliable deployment, the deployment mechanism comprises at least one pair of struts, one being a compression strut and the other a tension strut. In use, the catheter is positioned so that the filter membrane is down stream from the possible embolic source and upstream from any vital organs of concern. When deployed the filter membrane will capture emboli from the blood stream, and upon filter removal will extract the emboli from the patient.
    Type: Application
    Filed: September 3, 2003
    Publication date: April 15, 2004
    Inventors: Richard J. Morrill, John R. Fagan, David O. Williams
  • Patent number: 5980492
    Abstract: A blood containment, visualization and tactile confirmation device is provided for use with a vascular entry needle. The device includes a visualization channel and/or a compliant outer wall portion which indicates whether a needle connected to the device has entered a selected blood vessel. The visualization channel is optionally vented to the outside to allow displaced air to escape, but has a gas permeable member to prevent blood from escaping. Alternatively, the visualization channel is substantially sealed such that it is not significantly vented. Preferably, a compliant outer wall portion defining the visualization channel pulses with changes in blood pressure, thereby providing a tactile indication that the needle tip is properly positioned. The device has a guideway with a barrier of elastomeric material which prevents blood from passing therethrough, but which allows passage of an elongated medical instrument such as catheterization apparatus.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: November 9, 1999
    Assignee: Merit Medical Systems, Inc.
    Inventors: Jonathan J. Rosen, Richard A. Hillstead, Thomas D. Weldon, Charles E. Larsen, David O. Williams
  • Patent number: 5820596
    Abstract: A blood containment, visualization and tactile confirmation device is provided for use with a vascular entry needle. The device includes a visualization channel and/or a compliant outer wall portion which indicates whether a needle connected to the device has entered a selected blood vessel. The visualization channel is vented to the outside to allow displaced air to escape, but has a gas permeable member to prevent blood from escaping. The visualization channel may have one, two, or more stages, with a first stage chamber which indicates initial penetration of a selected blood vessel, and a second stage chamber which fills more slowly and indicates that the needle remains positioned within the blood vessel. A third stage chamber with entrapped air which compresses slightly due to the heartbeat may also be used. Preferably, a compliant outer wall portion pulses with changes in blood pressure, thereby providing a tactile indication that the needle tip is properly positioned.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: October 13, 1998
    Assignee: Merit Medical Systems
    Inventors: Jonathan J. Rosen, Richard A. Hillstead, Thomas D. Weldon, Charles E. Larsen, David O. Williams
  • Patent number: 5810370
    Abstract: A binding system for snow boards, including a pair of parallel strips along each edge of the board including opposing grooves and a frame element adjustably mounted between the strips secured within the grooves such that both the relative angle and the position along the length of the board may be varied. The securement elements for the boot holding straps are adjustable along the side of the frame to accommodate different boot sizes.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: September 22, 1998
    Inventors: Richard P. Covert, David O. Williams
  • Patent number: 5501671
    Abstract: A blood containment, visualization and tactile confirmation device is provided for use with a vascular entry needle. The device includes a visualization channel and/or a complaint outer wall portion which indicates whether a needle connected to the device has entered a selected blood vessel. The visualization channel is vented to the outside to allow displaced air to escape, but has a gas permeable member to prevent blood from escaping. The visualization channel may have one, two, or more stages, with a first stage chamber which indicates initial penetration of a selected blood vessel, and a second stage chamber which fills more slowly and indicates that the needle remains positioned within the blood vessel. A third stage chamber with entrapped air which compresses slightly due to the heartbeat may also be used. Preferably, a compliant outer wall portion pulses with changes in blood pressure, thereby providing a tactile indication that the needle tip is properly positioned.
    Type: Grant
    Filed: November 2, 1993
    Date of Patent: March 26, 1996
    Assignee: Novoste Corporation
    Inventors: Jonathan J. Rosen, Richard A. Hillstead, Thomas D. Weldon, Charles E. Larsen, David O. Williams
  • Patent number: 4429069
    Abstract: A polymer composition containing a flame retardant amount of tribromocumene. The polymer is preferably polyurethane and may be either foamed or non-foamed.
    Type: Grant
    Filed: June 15, 1983
    Date of Patent: January 31, 1984
    Assignee: Saytech, Inc.
    Inventor: David O. Williams
  • Patent number: 4425447
    Abstract: A polymer composition containing a flame retardant amount of tribromocumene. The polymer is preferably polyurethane and may be either foamed or non-foamed.
    Type: Grant
    Filed: April 12, 1982
    Date of Patent: January 10, 1984
    Assignee: Saytech, Inc.
    Inventor: David O. Williams
  • Patent number: 4089912
    Abstract: This application discloses stabilized flame-retardant styrenic polymer compositions comprising a bromine-containing flame-retardant, antimony trioxide and a three component stabilizer comprising a dialkyltin maleate, a hindered phenolic antioxidant, and a member selected from the group consisting of anhydrides of a cyclic dicarboxylic acid, ester derivatives thereof, imide derivatives thereof, and monomeric and dimeric polyesters.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: May 16, 1978
    Assignee: Great Lakes Chemical Corporation
    Inventors: Robert P. Levek, David O. Williams