Patents by Inventor Preben A. Petersen

Preben A. Petersen 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: 4762618
    Abstract: Apparatus and methods are disclosed for controlling the flow of a fluid past a membrane in a dialyzer. The apparatus disclosed includes a fluid conduit for conducting the fluid both towards and away from the dialyzer, a flow constrictor for creating a pressure drop in the fluid conduit either upstream or downstream of the dialyzer, a pump for pumping the fluid through that conduit, and a pressure detector for measuring a pressure corresponding to that pressure drop so as to control the flow therein. The method disclosed includes flowing the fluid through an upstream fluid conduit to the dialyzer and through a downstream fluid conduit away from the dialyzer, producing a relatively constant flow in both the upstream and downstream fluid conduits, creating a pressure drop in one of the fluid conduits, pumping the fluid through that conduit, and measuring the pressure corresponding to that pressure drop so that the flow of the fluid in that conduit can be controlled thereby.
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: August 9, 1988
    Assignee: Gambro AB
    Inventors: Bengt-Ake G. Gummesson, Preben A. Petersen, Jan P. Sternby
  • Patent number: 4728496
    Abstract: Apparatus and methods for controlling and sterilizing the flow of fluids through a medical treatment device such as a dialyzer including a fluid flow inlet for feeding the fluid to the medical treatment device, a heater for controlling the supply of heat to the fluid in the fluid flow inlet, a fluid flow outlet for withdrawing contaminated fluid from the dialyzer, a recirculation duct for recirculating at least a portion of the heated fluid from a point in the fluid flow inlet to an upstream point in the fluid flow inlet in which the heated fluid can again pass through the heater, and valves for selectively directing at least a portion of the fluid to the recirculation duct for sterilization purposes.
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: March 1, 1988
    Assignee: Gambro AB
    Inventors: Preben A. Petersen, Jan P. Sternby