Patents by Inventor Alexander Wirtzfeld

Alexander Wirtzfeld 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: 4763655
    Abstract: The stimulation frequency of a heart pacemaker is controlled dependent on a signal representative of the blood oxygen content of the patient. The blood oxygen dependent signal is generated by a blood oxygen sensor. A temperature sensor generates a separate signal dependent on blood temperature. The blood oxygen and blood temperature signals are combined such that the blood oxygen signal is lowered, i.e., the value thereof is reduced, in ranges of higher physical load indicated by an increase in the temperature dependent signal. The combined signal is used to control the stimulation frequency of a heart pacemaker so that the stimulation frequency is increased, if blood oxygen saturation is decreasing and/or blood temperature is increasing.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: August 16, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Alexander Wirtzfeld, Karl Stangl, Roland Heinze
  • Patent number: 4399820
    Abstract: A process and a device for regulating the stimulation frequency of heart pacemakers are disclosed. The process comprises generating with the aid of light emitted by a light-emitting element, reflected by the blood of a patient, and received by a light-receiving element, a current flow which causes, in a measuring probe, an increasing of the current flow at a constant probe voltage or a damping of the probe voltage at constant current flow. Thereafter, one of the possible changing values is measured and the change, with time, is evaluated as a measured quantity proportional to the change, with time, of the blood oxygen saturation, and, as a function of the measured quantity, the stimulation frequency of the heart pacemaker is regulated in such a manner that the greatest possible blood oxygen saturation is always achieved with the lowest stimulation frequency.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: August 23, 1983
    Inventors: Alexander Wirtzfeld, Roland Heinze, Thomas Bock, Hans D. Liess
  • Patent number: 4202339
    Abstract: A cardiac pacemaker includes means for conforming the stimulation frequency to the bodily stressing conditions of the wearer of the pacemaker in using a blood parameter as measuring value for the influencing of the frequency of stimulation. A measuring probe is implanted in the heart of the wearer of the pacemaker for measuring the oxygen saturation of the blood. The measuring value thereby resulting serves as measuring parameter for the influencing of the frequency of stimulation.
    Type: Grant
    Filed: December 19, 1978
    Date of Patent: May 13, 1980
    Assignee: Alexander Wirtzfeld
    Inventors: Alexander Wirtzfeld, Thomas Bock
  • Patent number: 3970076
    Abstract: A heart stimulator adapted to be used outside the body comprising pressure wave generating means and coupling means adapted to be placed on the surface of the body in the area of the heart without an air gap.
    Type: Grant
    Filed: February 4, 1975
    Date of Patent: July 20, 1976
    Assignee: Dornier System GmbH
    Inventors: Wolfgang Hepp, Alexander Wirtzfeld