Abstract: A defibrillator for atrium and/or ventricle having at least two capacitors which in the production of defibrillation pulses are discharged in at least two phases in succession in different configurations, wherein there are provided switching means which control the discharge in the at least two discharge phases in such a way that the mean value of their voltages is substantially equal and no voltages below the rheobase occur in any of the discharge phases, and a corresponding defibrillation method.

Abstract: A defibrillator for atrium and/or ventricle having at least two capacitors which in the production of defibrillation pulses are discharged in at least two phases in succession in different configurations, wherein there are provided switching means which control the discharge in the at least two discharge phases in such a way that the mean value of their voltages is substantially equal and no voltages below the rheobase occur in any of the discharge phases, and a corresponding defibrillation method.

Abstract: A cardiac pacemaker includes a stimulation electrode connected to the atrium and a pulse generator coupled to the stimulation electrode and operable for producing electrical pulses at a selectable frequency. A monitoring electrode is connected to the ventricle and is operable for sensing excitation signals in the ventricle in response to the electrical pulses at the stimulation electrode. The timing means is coupled to both the pulse generator and the monitoring electrode and is operable for measuring the time interval between an electrical pulse at the stimulation electrode and the occurrence of the associated excitation signal. An evaluation means is coupled to the timing means and is operable for evaluating the time interval. The evaluation means is coupled to the pulse generator and is operable to change the frequency of said pulse generator.

Abstract: A monitoring arrangement is disclosed for a high frequency surgery device, having a control electrode applied on a patient's body, which detects the high frequency voltage existing on the body surface during the treatment and introduces the same to a monitor circuit. The monitor circuit includes a voltage comparator which compares the body surface voltage with a reference voltage U.sub.ref and upon exceeding the reference voltage U.sub.ref, closes a relay which switches off the high frequency surgery device. The reference voltage U.sub.ref is determined individually for each patient beforehand and corresponds to the maximum tolerable body surface voltage of the particular patient.

Abstract: A control device for a high frequency surgical apparatus having circuitry for sensing excessive heat build-up in body tissue is disclosed. The control device comprises a control electrode, squaring circuit, integrating circuit, comparator and a relay, whereby high frequency current is cut off when the body tissue heat build-up becomes excessive.

Abstract: A synchronizable heart pacemaker includes a timing circuit, a differentiating circuit for receiving signals, and an interference recognition circuit connected to the output of the differentiating circuit. The interference recognition circuit includes a testing stage for each signal. An output signal normally appears on an output of the testing stage, and the testing stage includes a peak detector circuit which stores a positive maximum value and a negative maximum value of each signal differentiated by the differentiating stage, and an adder forming the sum of said maximum values. A discriminator stage is postcoupled to the testing stage.

Abstract: A heart pacemaker for generating a heart stimulation signal in the apparent absence of any heart stimulation signal during a given duration of time, includes an interference detecting device for sensing intracardiac voltage signals which generate, respectively, first and second signals.A retriggerable monostable first multivibrator is responsive to a trigger signal, so as to determine a first period of time, and, a second multivibrator is coupled to the first multivibrator, so as to operate for initiating a second period of time; the appearance of the second signals inhibits the heart stimulation signal; the first signal is generated in response to the sensing of one of the intracardiac voltage signals, and the second signals are generated whenever one of the intracardiac voltage signals is not succeeded by another voltage signal during the predetermined first period of time.