Patents by Inventor David S. Grubbs

David S. Grubbs 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 and apparatus for measuring cardiac output
    Patent number: 4572206
    Abstract: Cardiac output is measured utilizing an indicator, such as saline, which alters blood resistivity, and an electrically calibrated conductivity cell positioned at the tip of a catheter. The catheter with the tetrapolar conductivity cell at the tip is inserted into a blood vessel for current injection to develop a potential which is proportional to blood resistivity for inscribing the dilution curve occurring due to injection of the indicator, which curve is utilized to determine blood flow or cardiac output.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: February 25, 1986
    Assignee: Purdue Research Foundation
    Inventors: Leslie A. Geddes, David S. Grubbs