Patents by Inventor Bozidar Ferek-Petric

Bozidar Ferek-Petric 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: 5318595
    Abstract: A system and method for regulation of pacing signals, and more particularly for regulation of an atrioventricular interval in a cardiac electrotherapy system based on measurement of blood flow velocity profiles. More particularly, a diastolic blood flow filling wave and an atrial blood flow filling wave are determined and a time delay between peaks of the two waves and/or a superimposition velocity of the two waves relative to one another are utilized for the regulation. The regulation preferably occurs by comparing the measured time delay to a desired time delay or desired superimposition velocity, and the result of the comparison is then employed for regulating the pacing, or regulating the atrio-ventricular interval.
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: June 7, 1994
    Inventors: Bozidar Ferek-Petric, Branko Breyer
  • Patent number: 5316001
    Abstract: A cardiac electrotherapy system has flow velocity measurement capability for measuring a velocity of blood flow at a region of a tricuspid valve of a heart. A pacing system is provided which outputs a pacing electrical signal to the heart. A control unit which is responsive to a measured flow velocity from the flow velocity measurement unit detects heart irregularities and controls electrical pacing signals to the heart. In detecting heart irregularities, peak flow velocity waveforms are detected and analyzed. The flow velocity measurement employs a Doppler ultrasonic transducer which is mounted on a cardiac pacing lead in spaced relation to a pacing electrode at a distal end of the lead. When the pacing lead is inserted in the heart, the pacing electrode is placed at an apex of the right ventricle and the piezoelectric Doppler transducer is positioned at or near the tricuspid valve. The flow velocity transducer is preferably formed as an annular piezo body having associated electrodes.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: May 31, 1994
    Inventors: Bozidar Ferek-Petric, Branko Breyer
  • Patent number: 5271392
    Abstract: A method for administering cardiac electrotherapy and an implantable electrotherapy apparatus employ myocardial tensiometry to measure contractions of the heart muscle. The system includes a tensiometric element disposed at a location subject to bending due to cardiac contractions, the tensiometric element consisting either of piezoelectric material or variable resistivity material, the mechanical stresses to which the tensiometric element is subjected causing the element to produce a voltage or a resistivity variation comparable in frequency and amplitude to the contractions. The tensiometric element may be in the form of a strip disposed on a surface of a patch electrode, of the type suitable for use in an implantable defibrillator, or may be a strip or a tube located at the bend of a J-shaped pacing lead, of the type implantable in the atrium or in the ventricle in a cardiac pacemaker system.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: December 21, 1993
    Assignee: Siemens-Elema AB
    Inventor: Bozidar Ferek-Petric
  • Patent number: 5271408
    Abstract: A device for measuring blood flow in the vicinity of a catheter implanted within the vascular vessel or the heart uses hydrodynamic principles. The device has two transducers mounted at the exterior surface of the catheter spaced from each other. One of the transducers has a protrusion in the form of a hydrofoil profile, and the other transducer presents a substantially flat surface at the exterior of the catheter. The transducer having the hydrofoil profile generates a signal due to the quasi-static pressure acting on the transducer as well as due to the drag force acting on the transducer caused by the blood flow. The other transducer generates a signal solely due to the quasi-static pressure. The transducers can either be connected with opposite polarity, or their respective signals can be subtracted in a differential amplifier, so that a signal proportional to the axial flow velocity is obtained.
    Type: Grant
    Filed: March 23, 1992
    Date of Patent: December 21, 1993
    Assignee: Siemens Elema AB
    Inventors: Branko Breyer, Bozidar Ferek-Petric
  • Patent number: 5261418
    Abstract: A system for myocardial tensiometry is incorporated within an implantable electrotherapy apparatus to measure contractions of the heart muscle. The system includes a tensiometric element disposed at a location subject to bending due to cardiac contractions, the tensiometric element consisting either of piezoelectric material or variable resistivity material, the mechanical stresses to which the tensiometric element is subjected causing the element to produce a voltage or a resistivity variation comparable in frequency and amplitude to the contractions. The tensiometric element may be in the form of a strip disposed on a surface of a patch electrode, of the type suitable for use in an implantable defibrillator, or may be a strip or a tube located at the bend of a J-shaped pacing lead, of the type implantable in the atrium or in the ventricle in a cardiac pacemaker system.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: November 16, 1993
    Assignee: Siemens Aktiengesellschaft
    Inventor: Bozidar Ferek-Petric
  • Patent number: 5243976
    Abstract: A cardiac electrotherapy system has flow velocity measurement capability for measuring a velocity of blood flow at a region of a tricuspid valve of a heart. A pacing system is provided which outputs a pacing electrical signal to the heart. A control unit which is responsive to a measured flow velocity from the flow velocity measurement unit detects heart irregularities and controls electrical pacing signals to the heart. In detecting heart irregularities, peak flow velocity waveforms are detected and analyzed. The flow velocity measurement employs a Doppler ultrasonic transducer which is mounted on a cardiac pacing lead in spaced relation to a pacing electrode at a distal end of the lead. When the pacing lead is inserted in the heart, the pacing electrode is placed at an apex of the right ventricle and the piezoelectric Doppler transducer is positioned at or near the tricuspid valve. The flow velocity transducer is preferably formed as an annular piezo body having associated electrodes.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: September 14, 1993
    Inventors: Bozidar Ferek-Petric, Branko Breyer
  • Patent number: 5076272
    Abstract: An apparatus for administering electrotherapy, such as a pacemaker, having an alarm system including a relatively small alarm electrode affixed to the external surface of a non-conductive portion of the case of the apparatus, such as the neck. The apparatus, is implanted with the alarm electrode in contact with a muscle. A switch permits the alarm electrode to be used as the indifferent electrode for providing a patient alarm. The amplitude of the output may be varied to provide different alarm levels; i.e. different twitching intensity of the muscle, to permit the patient and physician to distinguish between alarms of diagnostic interest and those indicating a hazardous or emergency condition.
    Type: Grant
    Filed: June 15, 1990
    Date of Patent: December 31, 1991
    Assignee: Telectronics Pacing Systems, Inc.
    Inventor: Bozidar Ferek-Petric
  • Patent number: 4706681
    Abstract: Cardiac ultrasonically marked leads produced by mounting one or more piezoelectric marker transducers into the leads and connecting the transducers by electrical conductors to appropriate electronic circuits which, upon reception of the scanner ultrasonic signals by the marker transducers, generate appropriate electrical signals which localize unambiguously the marker transducers in an ultrasonic echographic image, thereby permitting guiding of pacing leads and detection of their malfunctions.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: November 17, 1987
    Assignee: Telectronics N.V.
    Inventors: Branko Breyer, Ivo Cikes, Bozidar Ferek-Petric