Biotronik Crm Patent Ag

Biotronik Se Co. Kg

Biotronik Gmbh & Co. Kg

Christopher S De Voir

Dirk Muessig

Jie Lian

Andrew B Kibler

Hannes Kraetschmer

Garth Garner

Richard A Schomburg

Sharon Lefkov

J Christopher Moulder

Sean Slee

Pamela Shamsie Victoria Riahi

Michael V Orlov

R Hollis Whittington

Dirk Müssig

David F Hastings

Shayan Guhaniyogi

Min Qu

Duane Patterson

Sharon Levkov

David F Ph D Hastings

An implantable cardiac pacemaker, wherein the pacemaker is configured to apply pacing pulses to the heart of a person during operation of the pacemaker, and wherein the pacemaker comprises a motion detection system that comprises a first module and a second module. The first module is configured to continuously run during operation of the pacemaker. The second module is configured to receive a trigger signal to change from an idle state to an active state or to receive a further trigger signal to change from an active state to an idle state. An energy consumption per time unit of the second module in the active state is larger than in the idle state. When the second module is in its active state, the second module is configured to execute a rate adaptation algorithm that adapts a rate of the pacing pulses to meet a metabolic demand of the person.

Dual-module motion detection system for the power saving of rate adaption algorithm in leadless pacemaker

A method for estimating an offset between a first group and a second group of contacts with respect to a longitudinal direction. Each group of contacts includes a plurality of electrodes arranged along a surface of a body of a lead. The method includes the steps of: (a) Selecting a number of electrode pairs, each electrode pair including an electrode of the first contact group and an electrode of the second contact group, and measuring the impedances between the electrodes of each selected electrode pair; (b) pre-conditioning the measured impedances for attenuating unwanted noise to generate pre-conditioned impedances, and (c) determining the lead offset using the pre-conditioned impedances.

Method for relative lead offset determination

An implantable cardiac device is provided. The implantable cardiac device includes a sensing unit adapted to measure an intrathoracic or intracardiac impedance, pressure, and/or accelerometry input stream, which includes a patient's respiratory waveforms. Furthermore, the implantable cardiac device includes a quantizer-unit adapted to sample the input stream with an initial sampling frequency Fs, providing input samples of the input stream. The implantable cardiac device further includes a filter banksuited to perform a streaming Wavelet transformation on the input samples on a sample-by-sample basis, using the initial sampling frequency Fs provided by the quantizer-unit, wherein the streaming Wavelet transformation is adapted to perform a source separation, extracting, and separating the respiratory waveforms of the input stream.

Implantable cardiac device adapted to extract a patient's respiratory waveforms from an intrathoracic or intracardiac impedance, pressure and/or accelerometry input stream

A device that monitors and evaluates electrogram signals representing electric activities of a heart chamber, and includes a signal input connected to a mapping catheter, and a signal processing and evaluation unit. The mapping catheter includes one or more electrode poles that pick up electric potentials and generate electrogram signals therefrom. When an electrogram signal is received by the signal input, the signal processing and evaluation unit identifies waveform deflections in the electrogram signal, measures deflection intervals between each pair of consecutive deflection complexes in the electrogram signal, measures at least one metric that characterizes a morphology of a deflection complex in the electrogram signal, generates a multi-dimensional deflection vector of at least two dimensions for each identified deflection, determines a distance between each pair of consecutive deflections from the multi-dimensional deflection vectors, and determines a cumulative distance between deflections in a time window of predetermined length.

Device for automatic mapping of complex fractionated atrial electrogram

A cardiac device and method for detecting QRS signals within a composite heart signal of a body including providing at least two input heart signals via at least two separate input channels, wherein each of the at least two input heart signals is recorded by pairs of sensing electrodes that have one electrode in common and provided coincidental in time. The cardiac device and method include generating estimated signals from the input heart signals, combining the input heart signals and the estimated signals to a combined input stream (SECG), and detecting the QRS signal by comparing the combined input stream (SECG) to an adaptive detection threshold (ATHR) which adapts throughout time.

Method for the detection of subcutanous cardiac signals and a cardiac device for use in detecting subcutaneous cardiac signals

The invention refers to a monitoring device for monitoring and analyzing physiological signals. The monitoring device comprises a transthoracic impedance measurement unit and an evaluation unit connected to the transthoracic impedance measurement unit. The transthoracic impedance measurement unit is adapted to conduct a transthoracic impedance measurement and to generate a transthoracic impedance signal representing a measured transthoracic impedance at consecutive points in time. The evaluation unit being configured to process the transthoracic impedance signal received from the transthoracic impedance measurement unit and to thus generate a respiration signal and to generate therefrom an evaluation signal reflecting at least a diurnal pattern of the respiration rate.

Night respiration rate for heart failure monitoring

Heart monitoring apparatus with sensing stage connectable to intracardiac electrode picking up electric potentials and adapted to process electric signals representing a time course of said potentials, a mechanical action detection stage adapted to generate a geometry signal having a time course reflecting heart chamber's geometry change, an evaluation unit connected to sensing stage and impedance measuring stage and adapted to determine a first and second fiducial point in the time course of said potentials and geometry signal, respectively, both fiducial points belonging to same heart cycle, and to determine a measured time delay between said fiducial points. Evaluation unit adapted to repeat said determined time delay to determine plurality of measured time delays and variance thereof or divergence of the statistical properties of cycle times based on said time course of said electric potentials versus cycle times based on said time course reflecting a change of a heart chamber's geometry.

Heart monitoring apparatus

Implantable medical device with an impedance determination unit with constant current/voltage source having current feed terminals connected to electrodes for intracorporal placement which generates measuring current pulses having constant current/voltage, for causing a current through a body via intracorporally placed electrodes, a measuring unit for measuring voltage/current strength of voltage/current fed through body, an impedance value determination unit connected to the current/voltage source and adapted to determine an impedance value for each measuring current pulse, and an impedance measuring control and evaluation unit connected to the impedance determination unit which controls the unit and evaluates a sequence of consecutive impedance values, the impedance determination unit further adapted to determine at least intrathoracic and intracardiac impedance values for same period of time, the intrathoracic values sampled with a lower sampling rate than the intracardiac values.

Implantable medical devices evaluating thorax impedance

An implantable medical device comprises at least two sensing channels for receiving sensed first and second location electrical signals originating from two different locations of a heart. A control unit is connected to the sensing channels and is adapted to process sensed electrical signals originating from first and second locations of the heart. The control unit incorporates an adaptive filter compensator adapted to generate an estimate signal for compensating a far-field contribution of the second location signal to the first location signal, thereby generating an output signal representing a near field signal originating from the first location. A gate is connected to the second location sensing channel and is adapted to enable the adaptive filter compensator only if a predetermined signal is sensed via the second location sensing channel.

Method and apparatus for reducing far-field interchamber interference in an implanted medical device

The invention relates to heart stimulators and implantable atrial pacemakers which utilize a rhythm based atrial capture threshold test wherein in a ventricle based DDI mode a predetermined number of ventricle started atrial and ventricular escape intervals are triggered with an overdrive rate about 20% higher than an intrinsic heart rate. The number of atrial sense events during atrial capture threshold test is counted. Too high of a number of atrial sense events indicates loss of capture due to too small of a pulse strength of the atrial stimulation pulses.

Atrial heart stimulator apparatus and method

A depolarization waveform classifier based on the Modified lifting line wavelet Transform is described. Overcomes problems in existing rate-based event classifiers. A task for pacemaker/defibrillators is the accurate identification of rhythm categories so correct electrotherapy can be administered. Because some rhythms cause rapid dangerous drop in cardiac output, it's desirable to categorize depolarization waveforms on a beat-to-beat basis to accomplish rhythm classification as rapidly as possible. Although rate based methods of event categorization have served well in implanted devices, these methods suffer in sensitivity and specificity when atrial/ventricular rates are similar. Human experts differentiate rhythms by morphological features of strip chart electrocardiograms. The wavelet transform approximates human expert analysis function because it correlates distinct morphological features at multiple scales. The accuracy of implanted rhythm determination can then be improved by using human-appreciable time domain features enhanced by time scale decomposition of depolarization waveforms.

Wavelet based feature extraction and dimension reduction for the classification of human cardiac electrogram depolarization waveforms

An apparatus according to the invention for the classification of physiological events has a signal input for the input of a physiological signal representing or constituting a physiological event and a classification unitfor classifying the physiological signal on the basis of its signal shape. The classification unitincludes a transformation unitwhich is designed to carry out transformation of the physiological signal in such a way that as the output signal it outputs a number of values representing the physiological signal and based on the transformation; and a probabilistic neural network which is connected to the transformation unitto receive the values and which contains a number of event classes which represent physiological events and which in turn are each represented by a set of comparative values, which probabilistic neural network is adapted on the basis of the comparison of the values with the comparative values to effect an association of the physiological signal represented by the values with one of the event classes.

Apparatus for the classification of physiological events

Pacemaker () comprises a control unit being adapted to automatically carry out a search for a capture threshold level of cardiac tissue. Available pulse strength values are tested in an iterative search wherein a next pulse strength value to be tested is determined based on Fibonacci indices.

Cardiac pacemaker

Heart stimulator that stimulates at least a heart's right atrium and ventricle in an atrium asynchronous stimulation mode with an overdrive stimulation rate. Interposes one resynchronization cycle after a sensed atrial event to regain AV synchrony during otherwise asynchronous stimulation mode. Allows for pacing mode that can pace the atrium with an overdrive stimulation rate in dual-chamber asynchronous mode while maintaining the AV synchrony and is called DDI(R)+. In DDI(R)+, pacemaker performs an atrial asynchronous (V synchronous) pacing mode such as DDI or DDI(R). The overdrive stimulation rate (OSR) is either a fixed rate (programmed by the external device) that is thought to be above the underlying intrinsic atrial rate, or is dynamically adjusted according to the measured atrial cycle length to be slightly above intrinsic atrial rate. The overdrive stimulation rate may be based on an intrinsic atrial rate or on hemodynamic need. DDI(R)+ timing may be ventricle-based.

Growing community of inventors

Tigard, OR, United States of America

Christopher S De Voir