Patents by Inventor Robert H. Whigham

Robert H. Whigham 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).

  • Pacing pulse compensation
    Patent number: 4903700
    Abstract: A pacemaker which generates a triphasic stimulus; the first and third phases are positive pulses, and the second is the negative stimulus. After-potentials are so low that reliable sensing of evoked signals are possible. The rapidity of the charge balancing is not affected by the stimulus amplitude because the relative amplitudes of the three phases are maintained independent of the stimulus amplitude.
    Type: Grant
    Filed: December 13, 1988
    Date of Patent: February 27, 1990
    Assignee: Telectronics N.V.
    Inventors: Robert H. Whigham, Tibor A. Nappholz
  • Pacing pulse compensation
    Patent number: 4821724
    Abstract: A pacemaker which generates a triphasic stimulus; the first and third phases are positive pulses, and the second is the negative stimulus. After-potentials are so low that reliable sensing of evoked signals are possible. The rapidity of the charge balancing is not affected by the stimulus amplitude because the relative amplitudes of the three phases are maintained independent of the stimulus amplitude.
    Type: Grant
    Filed: August 1, 1986
    Date of Patent: April 18, 1989
    Assignee: Telectronics N.V.
    Inventors: Robert H. Whigham, Tibor A. Nappholz
  • Pacemaker noise rejection system
    Patent number: 4779617
    Abstract: A noise rejection circuit for an implantable pacemaker. During re-triggerable relative refractory periods following a heartbeat, the peak noise level is sensed; the relative refractory period is re-started whenever the input signal exceeds the previous peak. Following a time-out of the relative refractory period, the peak value detected, representing the noise level, is added to the programmed threshold value; the sum is used as the threshold value during sensing.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: October 25, 1988
    Assignee: Telectronics N.V.
    Inventor: Robert H. Whigham
  • Storage in a pacemaker memory
    Patent number: 4716903
    Abstract: An implantable pacemaker which stores in memory the representation of an ECG signal by compressing the data. Whenever the input signal changes by a threshold amount from the last time data was recorded, a representation of the time interval which has elapsed is recorded. In a maximimally efficient system, the only information which must be stored are the successive elapsed times, along with indications of when the input signal changes slope.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: January 5, 1988
    Assignee: Telectronics N.V.
    Inventors: James C. Hansen, Tibor A. Nappholz, Robert H. Whigham
  • Automatic sensitivity control for a pacemaker
    Patent number: 4708144
    Abstract: An implantable pacemaker in which the sensitivity is automatically controlled. The peak value of each R wave is measured, and a long-term average is derived. The gain of the sense channel is adjusted automatically in accordance with the average of the measured peak values.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: November 24, 1987
    Assignee: Telectronics N.V.
    Inventors: John R. Hamilton, Robert H. Whigham
  • Combined pacemaker delta modulator and bandpass filter
    Patent number: 4692719
    Abstract: A combined pacemaker delta modulator and bandpass filter which requires only one active device. The sense signal is applied through a conventional delta modulator capacitor to the minus input of a differential amplifier, and the conventional current sources are connected to the minus input. Instead of simply connecting the plus input to a reference potential, however, it is also coupled, through a resistor, to the input signal, and an RC network is connected across the two inputs.
    Type: Grant
    Filed: August 1, 1986
    Date of Patent: September 8, 1987
    Assignee: Telectronics N.V.
    Inventor: Robert H. Whigham