摘要:
A detector for atrial fibrillation and/or atrial flutter comprises an atrial input for receiving an atrial signal representing an intraatrial electrogram or a time course of an intraatrial impedance, a ventricular input for receiving a ventricular event signal comprising information on an occurrence of a cyclically reoccurring ventricular event in chronological association to an atrial signal received via atrial input, an averaging unit adapted to average a plurality of sections of said atrial signal, each section to be considered for averaging starts or ends at a predetermined offset before a ventricular event, and to put out an averaged atrial signal, a peak amplitude determination unit adapted to determine peak-to-peak amplitude of said averaged atrial signal, and threshold comparator adapted to compare peak-to-peak amplitude of averaged atrial signal to predetermined reference value and to generate an AF warning signal if peak-to-peak amplitude of averaged atrial signal is less than predetermined threshold value.
摘要:
A detector for atrial fibrillation or flutter (AF) having an impedance unit, which has a measurement input, to which an atrial electrode line having an electrode for a unipolar measurement of an impedance in the atrium is connected and is implemented to generate an atrial impedance signal obtained in a unipolar manner in such a way that the impedance signal comprises multiple impedance values detected at different instants within a particular atrial cycle for each atrial cycle, comprising an atrial contraction and the following relaxation of the atrium, and having a signal input, via which a ventricle signal is to be supplied to the detector, which reflects the instants of ventricular contractions in chronological assignment to the impedance signal, the detector having an analysis unit, which is implemented to average multiple sequential impedance signal sections of a unipolar atrial impedance signal, delimited by two sequential ventricular contractions in each case, with one another and to determine the maximum amplitude of the averaged unipolar atrial impedance signal section, compare it to a comparison value, and if the maximum amplitude of the averaged unipolar atrial impedance signal is less than a comparison value, to generate an AF suspicion signal.
摘要:
An electromedical implant for monitoring a thoracic property of a living being is provided that includes a detector arrangement including an impedance measuring unit and an electrode arrangement, which are equipped to capture a measurement signal associated with the thoracic property in the form of an impedance signal; a monitoring arrangement, which is connected to the detector arrangement and equipped to generate a parameter from the measurement signal that is indicative of the thoracic property, and an evaluation unit, which is connected to the monitoring arrangement and equipped to determine an evaluation result regarding the thoracic property based on the parameter. According to the invention, the electrode arrangement comprises at least a plurality of mutually isolated electrodes, which are disposed on the housing and operatively connected by way of the impedance measuring unit and which can be separately controlled, wherein an electrode body has a strip shape.
摘要:
An electromedical implant (100, 101, 102, 103) for monitoring a cardiac blood flow (B1) of a patient includes a detector (10, 10′, 10″) which obtains a first measurement signal (S1) associated with the cardiac blood flow (B1) and a second measurement signal (S2) associated with the epithoracic, peripheral blood flow (B2). A monitoring assembly (20) then generates a first parameter (P1) from the first measurement signal (S1) which is indicative of a time (tsys) at which blood is ejected from the heart, and a second parameter (2) from the second measurement signal (S2) which is indicative of a time (tgef) of a blood pulse in the thoracic tissue which is associated with the ejection of blood. An evaluation unit (30) then generates a pulse transit time (Δt=tgef−tsys) from the first parameter (P1) and the second parameter (P2). The detector (10, 10′, 10″) includes an impedance measuring unit (12) having an electrode assembly (11, 11′) for detection of at least the second measurement signal (S2) in the form of an impedance signal.
摘要:
An implantable cardiac stimulator includes at least one first sensing unit for detecting intrinsic cardiac activities of a first ventricle, at least one ventricular stimulation unit for stimulating a second ventricle, and a stimulation control unit connected to the first sensing unit. The stimulation unit processed output signals of the first sensing unit and generates control signals for the stimulation units. The stimulation control unit derives a current intrinsic RR interval from detected ventricular intrinsic cardiac activities R of the first ventricle, and to determine from the RR interval a delay interval Δ, which begins with a ventricular event of the first ventricle and at the end of which the stimulation control unit triggers a stimulation of the second ventricle (unless it is suppressed).
摘要:
The invention concerns implantable cardiac stimulation devices in general which have at least one stimulation pulse generator (A-STIM; RV-STIM; LV-STIM) to selectively generate a stimulation pulse for delivery to one of at least two different chambers of a heart, said chambers include right and left atria and right and left ventricles, at least one impedance measuring stage (I, U, IMP) being connected to electrodes or connectors for such electrodes to measure an intracardiac impedance when in use, a control unit (CTRL) connected to the stimulation pulse generator and to the impedance measuring unit and being adapted to process a minimum impedance value for a heart cycle to trigger stimulation pulses for two different chambers of the heart with an adjustable time delay (VVD; AVD) and to adjust said time delay depending upon the measured intracardiac impedance minimum value. According to the invention the control unit is adapted to adjust the time delay such that the minimum value of the intracardiac impedance during one heart cycle is minimized or such that the AVD delay is equal to the time interval between an atrial event and the point of time when the minimum impedance value occurs after said atrial contraction.
摘要:
Implantable pressure measuring unit for internal pressure measurement in a blood vessel or heart of a patient, having a pressure sensor having electrical signal output, fixing means adapted to the intended measurement location for fixing the pressure sensor, a power supply unit of the pressure sensor, a signal detection unit connected by a line to the signal output of the pressure sensor, and a transmitting unit connected to a measurement data output of the signal detection unit, in particular for wireless transmission of measurement data to an analysis unit, in particular outward from the patient body.
摘要:
An electromedical implant includes a measuring signal generator, an impedance measuring unit to determine the impedance of human or animal tissue, a control unit which, for controlling the measuring signal generator and the impedance measuring unit, is at least indirectly connected to the measuring signal generator and to the impedance measuring unit, as well as an electrode arrangement comprising at least two electrodes which can be directly or indirectly connected or at least temporarily connected to the measuring signal generator and to the impedance measuring unit, or to a connection for such an electrode arrangement. The measuring signal generator is designed to generate and emit a current pulse or a series of current pulses, and the control unit is designed at a specific point in time to cause the measuring signal generator (to generate and emit a current pulse, and to cause the impedance measuring unit to measure the voltage that is present between the electrodes connected to the measuring signal generator and the impedance measuring unit after the passing of at least two time periods of different length that start with commencement of the current pulse being emitted and end before the end of emitting the current pulse, and to issue a voltage value which in each case represents the measured voltage.
摘要:
An implantable cardiac stimulator includes at least one first sensing unit for detecting intrinsic cardiac activities of a first ventricle, at least one ventricular stimulation unit for stimulating a second ventricle, and a stimulation control unit connected to the first sensing unit. The stimulation unit processed output signals of the first sensing unit and generates control signals for the stimulation units. The stimulation control unit derives a current intrinsic RR interval from detected ventricular intrinsic cardiac activities R of the first ventricle, and to determine from the RR interval a delay interval Δ, which begins with a ventricular event of the first ventricle and at the end of which the stimulation control unit triggers a stimulation of the second ventricle (unless it is suppressed).
摘要:
Embodiments relate to a heart monitor, which is connected to or can be connected to at least one sensor for pressure and volume data or equivalent substitute variables and which comprises an evaluation unit for processing at least one input signal reflecting the temporal course of pressure and volume data or equivalent substitute variables of the heart. The evaluation unit is configured such that it segments the input signal in accordance with individual completed cardiac cycles and examines segments of the input signal obtained in this way as to whether a particular segment of the input signal represents a PV diagram, which corresponds to specified quality conditions regarding the direction of circulation, morphology and distance between a starting and end values.