Patents by Inventor Donald A. Spring

Donald A. Spring 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).

  • Pressure generator for intravascular dilator
    Patent number: 4429724
    Abstract: A pressure generator for intravascular dilators includes a ram and a syringe holder. A screw drive having a large mechanical advantage is coupled for advancing the ram at a controlled rate. A coupler at one end of the ram is adapted to engage one end of a syringe plunger whereby dilation liquid will be discharged at a controlled pressure from the syringe as the ram is advanced. The pressure generator may be provided with a pistol grip and the ram may be calibrated for direct pressure readout.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: February 7, 1984
    Assignee: Cardiovascular Diagnostic Services, Inc.
    Inventors: Gerald Dorros, Donald A. Spring