Patents by Inventor William R. Chang

William R. Chang 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).

  • Method of controlling the flow of bodily fluid
    Patent number: 8603057
    Abstract: A system and method are disclosed for automatically limiting the drainage of a bodily fluid such as cerebrospinal fluid (CSF) from a patient into a collection chamber. The collection chamber includes a vent having an hydrophobic filter for the passage of air to facilitate the movement of CSF yet to maintain a closed system. The system includes a buoyant float hingedly connected with the top of the collection chamber in one embodiment. When fluid rises in the collection chamber to a predetermined volume, buoyant force raises the float and causes a seal plug mounted on top of the float to seal one of an inflow port or a vent port. The float is limited to pivoting movement in one plane and to a certain angle within that plane. The system and method avoid overdrainage of CSF from the patient and overfilling of the collection chamber.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: December 10, 2013
    Assignees: Integra LifeSciences Corporation, The Regents of the University of California
    Inventors: Brian Hoffman, Michael McDermott, William R. Chang, Eric Scott Clasen
  • METHOD OF CONTROLLING THE FLOW OF BODILY FLUID
    Publication number: 20120283676
    Abstract: A system and method are disclosed for automatically limiting the drainage of a bodily fluid such as cerebrospinal fluid (CSF) from a patient into a collection chamber. The collection chamber includes a vent having an hydrophobic filter for the passage of air to facilitate the movement of CSF yet to maintain a closed system. The system includes a buoyant float hingedly connected with the top of the collection chamber in one embodiment. When fluid rises in the collection chamber to a predetermined volume, buoyant force raises the float and causes a seal plug mounted on top of the float to seal one of an inflow port or a vent port. The float is limited to pivoting movement in one plane and to a certain angle within that plane. The system and method avoid overdrainage of CSF from the patient and overfilling of the collection chamber.
    Type: Application
    Filed: July 16, 2012
    Publication date: November 8, 2012
    Applicant: INTEGRA LIFESCIENCES CORPORATION
    Inventors: Brian Hoffman, Michael McDermott, William R. Chang, Eric Scott Clasen
  • Volume limiting bodily fluid drainage system
    Patent number: 8221366
    Abstract: A system and method are disclosed for automatically limiting the drainage of a bodily fluid such as cerebrospinal fluid (CSF) from a patient into a collection chamber. The collection chamber includes a vent having an hydrophobic filter for the passage of air to facilitate the movement of CSF yet to maintain a closed system. The system includes a buoyant float hingedly connected with the top of the collection chamber in one embodiment. When fluid rises in the collection chamber to a predetermined volume, buoyant force raises the float and causes a seal plug mounted on top of the float to seal one of an inflow port or a vent port. The float is limited to pivoting movement in one plane and to a certain angle within that plane. The system and method avoid overdrainage of CSF from the patient and overfilling of the collection chamber.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: July 17, 2012
    Assignee: Integra LifeSciences Corporation
    Inventors: Brian Hoffman, Michael McDermott, William R. Chang, Eric Scott Clasen
  • VOLUME LIMITING BODILY FLUID DRAINAGE SYSTEM
    Publication number: 20090088710
    Abstract: A system and method are disclosed for automatically limiting the drainage of a bodily fluid such as cerebrospinal fluid (CSF) from a patient into a collection chamber. The collection chamber includes a vent having an hydrophobic filter for the passage of air to facilitate the movement of CSF yet to maintain a closed system. The system includes a buoyant float hingedly connected with the top of the collection chamber in one embodiment. When fluid rises in the collection chamber to a predetermined volume, buoyant force raises the float and causes a seal plug mounted on top of the float to seal one of an inflow port or a vent port. The float is limited to pivoting movement in one plane and to a certain angle within that plane. The system and method avoid overdrainage of CSF from the patient and overfilling of the collection chamber.
    Type: Application
    Filed: September 2, 2008
    Publication date: April 2, 2009
    Applicant: INTEGRA LIFESCIENCES CORPORATION
    Inventors: Brian Hoffman, Michael McDermott, William R. Chang, Eric Scott Clasen