Patents by Inventor Donald Van Nimwegen

Donald Van Nimwegen 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: 4828551
    Abstract: The subject patient controlled analgesia (PCA) apparatus is mechanical/hydraulic and comprises a reservoir and a pump operable by the patient for dispensing medicine from the reservoir unto the patient's IV system in incremental doses. The pump capacity per stroke may be adjustable, thereby adjusting the size of each dose dispensed. Timing apparatus assures that a specific interval of time (the lockout interval) must pass between sequential dosage dispensations. Check valves in the passages for pumping the medicine and filling the apparatus are double in series to reduce chances of malfunction or misuse due to valve failure. The quantity of medicine in the reservoir is indicated.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: May 9, 1989
    Inventors: Robert A. Gertler, Donald Van Nimwegen