Patents by Inventor David J. Farrar

David J. Farrar 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: 6821295
    Abstract: A bypass graft includes a tubular portion having an internal tubular diameter and a first end and a second end. The tubular portion has a central axis. A flared portion has an adjoining end, wherein the adjoining end of the flared portion is integrally formed on and is substantially concentric with the second end of the tubular portion, and a flared end, wherein the flared end has a flared end internal diameter, such that the internal flared end diameter is greater than the internal tubular diameter. The flared portion includes a circumferential skirt for surgical attachment of the graft to a patient's blood vessel.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: November 23, 2004
    Assignee: Thoratec Corporation
    Inventor: David J. Farrar
  • Patent number: 5344385
    Abstract: This invention provides a simple skeletal muscle linear pull energy convertor which can harness the maximal amount of muscle power for a wide variety of implantable medical devices, including the full range of circulatory support devices. The muscle powered system provides completely implantable circulatory support as an alternative to cardiac transplantation, with a quality of life relatively free from external batteries, transcutaneous energy transmission and other electromechanical hardware.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: September 6, 1994
    Assignee: Thoratec Laboratories Corporation
    Inventors: Keith E. Buck, David J. Farrar, Robert J. Harvey, Philip Litwak, John R. Rueff
  • Patent number: 4662358
    Abstract: An electronic control system for controlling the operation of a cardiac prosthesis is disclosed. The cardiac prosthesis includes dominant and subordinate ventricles which receive blood in response to body requirements and an actuation device coupled to the ventricles for ejecting blood from the ventricles. The electronic control system includes sensing devices to determine the volume of blood in the ventricles as a function of time. A control device, which in the preferred embodiment is a programmed microcomputer, includes a clock controller which first determines the filling flow rates of the ventricles from the volume information from the sensing devices. The ventricle with the greatest filling flow rate is selected as the dominant ventricle. The clock controller then adjusts the heart rate of the cardiac prosthesis as a function of the filling flow rate of the dominant ventricle to allow just enough time for the dominant ventricle to fill completely.
    Type: Grant
    Filed: April 17, 1984
    Date of Patent: May 5, 1987
    Assignee: Thoratec Laboratories Corporation
    Inventors: David J. Farrar, Thomas C. Robinson
  • Patent number: 4331165
    Abstract: Ventilated cigarettes are made by perforating the wrapper of each filter over an area which lies within pre-formed perforations in the uniting band joining the filter to the tobacco rod. The filter wrappers may be perforated by pins on a rolling plate and fluted drum between which filter portions cut from longer filter rods are rolled to stagger the portions so that they can then be pushed into a single row.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: May 25, 1982
    Assignee: Molins, Ltd.
    Inventors: David J. Farrar, Ralph W. Beck, Edward G. Preston, Robert E. Williams
  • Patent number: 4174780
    Abstract: A cigarette hopper, especially for a packing machine, has a number of flow channels (6) incorporating restraining devices to arrest cigarettes which are faulty, e.g. in size, shape or orientation, thereby preventing the formation of defective cigarette bundles. The lower ends of the channels (22) may be curved to catch non-horizontal cigarettes (C3), and may include photo-cell devices (FIG. 3) which detect and arrest inadequately filled cigarettes and which additionally serve to monitor the flow of cigarettes so that the machine operator can receive a fault warning.
    Type: Grant
    Filed: June 20, 1978
    Date of Patent: November 20, 1979
    Assignee: Molins Limited
    Inventors: David J. Farrar, Robert W. Davies, David C. M. Carter, Reginald C. Bolt, Robert E. Williams