Abstract: The invention relates to a cardiac defibrillator used to treat a patient in cardio-circulatory arrest by a shock from a dosed biphasic discharge from a capacitor through an H-bridge comprising a high-voltage switch A, B, C or D in each of the limbs thereof. Said cardiac defibrillator is characterised in that each opposing polarity phase of the biphasic shock is controlled in two stages in such a way that, for each pair of switches associated with a phase, the first switch is switched on and remains on during the entire phase, while the second switch switches off in a staggered manner in relation to the first switch for a controlled amount of time in order to pass the current through the patient during said phase, the same process being carried out for the second phase with the other pair of switches. The invention is especially suitable for manufacturers of defibrillation appliances.

Abstract: The invention concerns a method which consists in measuring the patient's transthoracic resistance between two defibrillation electrodes applied to the patient during a defibrillation impact by using the first elementary pulse derived from chopping and modulation of the defibrillation pulse(s) to measure the patient's transthoracic resistance, the following elementary pulses being modulated so as to deliver to the patient the pre-selected or intended energy, independently of his transthoracic resistance between the defibrillation electrodes and without increasing the total duration of the series of impulses. The device consists of a user interface (1), a microcontroller (2), a high voltage generator (3), a high voltage circuit (4) and a wave form generator (5). The present invention is of interest to manufacturers of defibrillators.

Abstract: An apparatus for electrotherapy has a checking circuit. The checking circuit is used for checking the functions of the apparatus in a test routine or for requesting the status of components in the apparatus. The apparatus is provided with communication means which interact with the checking circuit and are used for transmitting data, for example the result of a test routine, to a receiver.

Abstract: A series of defibrillation impulses and device for generating them in which the impulses are constituted by a wave with at least two phases of which successive phases of opposite polarity are cut or chopped at a higher frequency than the frequency of the successive phases.

Abstract: A series of defibrillation impulses and device for generating them in which the impulses are constituted by a wave with at least two phases of which successive phases of opposite polarity are cut or chopped at a higher frequency than the frequency of the successive phases.

Abstract: The present invention has for its object impulses or series of defibrillation impulses and device for generating them. Impulses or series of defibrillation impulses, characterized in that they are constituted by a wave with at least two phases of which successive phases of opposite polarity are cut or chopped at a higher frequency than the frequency of said successive phases.

Abstract: A detector device delivering a signal representative of the respiration of patient, adapted to be used in a charged and sensitive electromagnetic environment. The device is principally constituted by at least two non-metallic electrodes (1) and by a unit for the processing of electrical signals emitted by the heart, comprising a first module (5) for acquiring and shaping cardiac electric signals, a second module (6) for extraction of the respiratory signal, and a third module (7) for electro-optical conversion of this latter, the modules being disposed in a shielded casing (8) forming a Faraday cage and, finally, by an optical connection (9) connecting the casing (8) to at least one other apparatus or device.

Abstract: Procedure to recognize a ventricular cardiac pathological condition in view of an automatic defibrillation and monitor/defibrillator to implement the procedureProcedure to recognize a ventricular cardiac pathological condition characterized in that after an analog preprocessing, the ECG signals are continuously sampled and digitized, then digitally processed by basic periods in such a manner as to periodically measure distinct basic values according to three criteria of zeros Z, of cardiac frequency FC and of arrythmia RR, then to individually allocate to each value a probability weighting according to a weighting scale specific to each criteria, to proceed to sum these basic values to establish an overall probability over a given duration utilized to determine the triggering of a recognition alarm of a cardiac pathological condition. The invention is of particular interest in cardiology in the medical industry.

Abstract: Elementary capacitor of high energy density and high voltage, for energy accumulation, discharge, commutation or filtering purposes, comprising two conductive armatures separated by at least one dielectric layer, characterized in that each armature is associated, with at least one layer of a first dielectric, in that each armature is formed by a metallization having a resistance per surface unit of between 2 and 30 ohm, being applied on a second dielectric made of a fibrous support favoring regeneration in such a manner that the capacitor will be regenerating (self-curing), in that the capacitor is impregnated with a liquid dielectric, in that the thickness and the nature of each dielectric as well as the liquid dielectric are so selected to ensure that when the rated voltage is applied, the ratio between the prevailing electric field strength and the disruptive strength is substantially equal for each of the dielectrics.

Abstract: A device for a defibrillating or cardioverting electric shock to a patient for correcting securement tachyarrhythmias features of a catheter for insertion through the right atrium and into the right ventricle for locating a heartbeat sensor inside the heart and at least one discharge electrode in the right ventricle spaced from the interior surface of the heart, another discharge electrode external to the heart and circuitry connected by the catheter between the sensor and discharge electrodes for supplying electric shock to the discharge electrodes in response to a signal from the heartbeat sensor.

Abstract: A discharge capacitor having an energy density of at least 0.4 J/cm.sup.3, perferably for defibrillators, comprising at least one plastic dielectric foil and two electrically conductive armatures (4) separated by the plastic foil is rolled up and enclosed in a housing (60) and has an operating voltage in the range of 600 V to 6000 V and an electric energy accumulation capacity of 10 J to 500 J. Each armature (4) coacts with at least one of the plastic foils (6, 7, 86, 87, 88). Each armature is formed by a metallization (4) and is applied to a paper foil (5) impregnated with a liquid dielectric to provide a regenerating capacity. The impregnated foil is superimposed upon one of the plastic foils so that the capacitor takes the form of a regenerating (self-curing) capacitor.

Abstract: A medical device for electroshock therapy, and more particularly a defibrillator for the treatment of ventricular and auricular fibrillation. Devices of this kind contain a high-voltage generator comprising a transformer with a rectifier connected to its output for charging a shunt capacitor which can be discharged through the patient by means of electrodes connected to it. In order to avoid by simple means the occurrence of dangerous leakage currents and in order to simplify the solving of the problem of high-voltage insulation, the rectifier comprises two branch circuits which are connected to a common transformer winding and which feed the shunt capacitor; furthermore, a high-impedance voltage divider is connected in parallel to the shunt capacitor with its center connected to chassis.