Patent application number | Description | Published |
20080294216 | Implantable Cardiac Stimulator , System, Device and Method for Monitoring Cardiac Synchrony - In a system and method for monitoring cardiac synchrony in a human heart, a first sensor is positioned at a first cardiac wall location of a heart that is subject to movements related to longitudinal valve plane movements along the longitudinal axis of the heart, and the first sensor measures said cardiac wall movements at the first cardiac wall location and emits a first sensor output signal corresponding thereto, a second sensor is positioned at a second cardiac wall location of the heart that is subject to movements related to longitudinal valve plane movements along the longitudinal axis of the heart, and the second sensor measures the cardiac wall movements at the second cardiac wall location and emits a second sensor output signal corresponding thereto. A lead arrangement is electrically connected to the first and second sensors and conducts the first and second sensor output signals therefrom to processing circuitry that processes the first and second sensor output signals to produce a synchronization signal therefrom indicative of synchrony in the respective valve plane movements at the first and second cardiac wall locations. | 11-27-2008 |
20090149908 | IMPLANTABLE HEART STIMULATING DEVICE, SYSTEM AND METHOD - In an implantable biventricular heart stimulating device, and a biventricular heart stimulating method, wherein operation takes place normally with a time VV between a pacing pulse delivered, or inhibited, by a first ventricular pacing circuit and a pacing pulse delivered, or inhibited, by a second ventricular pacing circuit, and wherein a time VV | 06-11-2009 |
20100041970 | IMPLANTABLE MEDICAL DEVICE - An implantable medical device has an oxygen sensor adapted to measure the level of oxygen in oxygenized blood, and to generate an oxygen measurement signal in dependence of the level of oxygen. The oxygen sensor is adapted to perform measurements inside the heart, of blood entering the left atrium of a patient's heart. The obtained oxygen measurement signal is compared to a predetermined threshold level and an indication signal is generated in dependence of the comparison. The, indication signal is indicative of the lung functionality of the patient. | 02-18-2010 |
20100057158 | Neurostimulation Based On Glycemic Condition - A glycemic condition is indicated based on variance of a feature derived from cardiac electrogram data. Neurostimulation is then used to counteract a cardiac-related autonomic response to the glycemic condition. For example, stimulation of parasympathetic innervation may be used to counteract an autonomic sympathetic response that is associated with hypoglycemia or hyperglycemia. In addition, stimulation of sympathetic innervation may be used to counteract an autonomic parasympathetic response that is associated with hypoglycemia or hyperglycemia. | 03-04-2010 |
20100099994 | IMPLANTABLE HEART ANALYZING DEVICE, SYSTEM AND METHOD - An implantable heart analyzing device has a housing and a control circuit located within said housing. The control circuit generates an output signal adapted to actuate an activator, which is able to make a wall of the heart deflect or vibrate. The control circuit also communicates with a sensor, which can be identical with the activator, with which the movement of the heart wall can be sensed. The control circuit executes a procedure that involves the generation of an output signal and sensing a corresponding sensor signal, and to be able to derive information concerning the tension of the heart wall. An implantable heart analyzing includes the aforementioned heart analyzing device, as well as the activator and the sensor. The heart analyzing device and the system implement a method that results in generation of the aforementioned information concerning the tension of the heart wall. | 04-22-2010 |
20100106210 | IMPLANTABLE MEDICAL SYSTEM FOR DETECTING INCIPIENT EDEMA - An implantable medical system for detecting incipient edema has an implantable medical lead including an optical sensor having a light source and a light detector. The medical system further has an edema detection circuit that activates the light source to emit light, the light being directed into lung tissue of a patient and that obtains a light intensity value corresponding to an intensity of light received by the light detector, and that evaluates the light intensity value to detect a consistency with incipient edema. | 04-29-2010 |
20100121404 | IMPLANTABLE HEART STIMULATING DEVICE - Implantable heart stimulating device has at least one electrode lead provided with at least two electrodes adapted to be arranged for electrical stimulation of a heart, a pulse generating that applies stimulation pulses between the electrodes, wherein one of the electrodes is the cathode and the other is the anode, to achieve cathodal capture of heart tissue by the cathode electrode. An anodal capture detector detects anodal capture at the anode electrode. The device further has a control unit and if anodal capture is detected by the detection means, the control unit changes the pacing regimen in order to optimize the hemodynamics of the heart. | 05-13-2010 |
20100222836 | IMPLANTABLE CARDIAC STIMULATOR, DEVICE AND METHOD FOR MONITORING THE HEART CYCLE IN A HUMAN HEART - In a device for monitoring the heart cycle of a human heart such that coronary flow may be maintained at a desired level, and a heart stimulator including such a device, the monitoring device is connectable to a first sensor adapted to be positioned at a first location of the heart and arranged for sensing cardiac wall movements at the first location, and to a second sensor adapted to be positioned at a second location of the heart and arranged for sensing cardiac wall movements at said second location. Processing circuitry receives output signals from the first and second sensors, which output signals are indicative of myocardial relaxation at said first and second locations. The processing circuitry determines the time of myocardial relaxation at the first and second locations, and provides a diastolic synchronization signal indicative of the synchrony in the time of myocardial relaxation between the first location and the second location. | 09-02-2010 |
20100249864 | METHOD AND APPARATUS FOR DETERMINING VARIATION OVER TIME OF A MEDICAL PARAMETER OF A HUMAN BEING - An apparatus for determining variation over time of a medical parameter of a human being obtained from a sensed signal has a sensor implantable in the human being for sensing the signal. A comparator compares at least one characteristic property, derived from the sensed signal obtained for at least one predetermined first level of activity of the human being, with corresponding reference property of a sensed reference signal, obtained for a predetermined reference level of activity of the human being, for determining a relation between the characteristic property of the sensed signal and the reference property. A trend determining unit determines trends in the medical parameter by analyzing the relation between the characteristic property of the sensed signal obtained at different times and the reference property. A corresponding method also function an implant for heart failure diagnostics also function as described. A sensor is then arranged to pick up dynamic mechanical information from the heart of the human being and generate a corresponding signal. A heart stimulator includes such an implant and a control unit arranged to control stimulation of the heart depending on determined trends in the medical parameter. | 09-30-2010 |
20110046691 | IMPLANTABLE HEART STIMULATOR DETERMINING LEFT VENTRICULAR SYSTOLIC PRESSURE - An implantable heart stimulator has an impedance measurement a cardiogenic impedance waveform using an impedance configuration arranged to measure myocardial contractility of the heart. The heart stimulator further has a calculating unit that calculates an estimate value being related to at least two impedance values of the waveform, or of an average waveform of several consecutive waveforms, during a predetermined time period of the waveform, or average waveform, the calculated estimate value being an estimate of the left ventricular (LV) systolic pressure. | 02-24-2011 |
20110112419 | IMPLANTABLE MEDICAL DEVICE AND METHOD FOR CLASSIFYING ARRHYTHMIA EVENTS - In an implantable medical device such as an implantable cardiac defibrillator, and a method for classifying arrhythmia events, IEGM signals are analyzed to detect an arrhythmia event and a respiratory pattern of the patient is sensed. At least one respiratory parameter reflecting characteristics of the respiratory pattern of the patient is determined based on the sensed respiratory pattern and a respiratory measure corresponding to a change of a rate of change of the at least one respiratory parameter is calculated. The detected arrhythmia event is classified based on the respiratory measure and the IEGM signals, wherein arrhythmia events that satisfy at least a first criterion is classified as an arrhythmia event requiring therapy. | 05-12-2011 |
20110230746 | METHOD, IMPLANTABLE MEDICAL DEVICE, AND SYSTEM FOR DETERMINING THE CONDITION OF A HEART VALVE - An implantable medical device has an impedance processor for determining atrial impedance data reflective of the cardiogenic impedance of an atrium of a heart during diastole and/or systole of heart cycle. Ventricular impedance data reflective of the cardiogenic impedance of a ventricle during diastole and/or systole are also determined. The determined impedance data are processed by a representation processor for estimating a diastolic and/or a systolic atrial impedance representation and a diastolic and/or a systolic ventricular impedance representation. A condition processor determines the presence of any heart valve malfunction, such as valve regurgitation and/or stenosis, of at least one heart valve based on the estimated atrial and ventricular impedance representations. | 09-22-2011 |
20110245701 | ARRHYTHMIA CLASSIFICATION - An implantable medical device, is designed to collect a signal representative of the electric activity of the heart and determine a cardiogenic impedance signal for at least a portion of the heart. An R-wave detector of the IMD detects the timing of an R-wave during a cardiac cycle based on the signal representative of the electric activity. A minimum detector detects the timing of a cardiogenic impedance minimum in the cardiogenic impedance signal and within a systolic time window of the cardiac cycle. A detected arrhythmia is then classified by the IMD based on the timing of the R-wave detected by the R-wave detector and the timing of the cardiogenic impedance minimum detected by the minimum detector. | 10-06-2011 |
20110257697 | IMPLANTABLE MEDICAL DEVICE AND METHOD FOR MONITORING SYNCHRONICITY OF THE VENTRICLES OF A HEART - In an implantable medical device and a method for monitoring ventricular synchronicity of a heart. In particular, impedance signals are measured and an occurrence of a notch is detected in the impedance signal coincident with a period including a change from rapid to slow filling of a ventricle. The notch is indicated by a first positive slope change in a negative slope in a predetermined time window during a diastolic phase of a cardiac cycle. A degree of synchronicity is determined based on the notch feature, wherein a decreasing notch feature indicates an increased degree of synchronicity in the filling phase of the ventricles. | 10-20-2011 |
20120157861 | DEVICES AND METHOD FOR DETERMINING AND MONITORING A CARDIAC STATUS OF A PATIENT BY USING PLVDT OR PLVST PARAMETERS - The present invention relates to an improved medical device and method for accurately and reliably determining a cardiac status of a patient. An implantable medical device, IMD, comprises a sensor arrangement adapted to sense signals related to mechanical activity of the heart and an activity level sensor arrangement adapted to sense an activity level of the patient. Further, the IMD calculates a percentage of left ventricular diastolic time (PLVDT) for a cardiac cycle corresponding to a relation between a diastolic time interval and a cardiac cycle time interval using the determined systolic and diastolic time intervals or a percentage of left ventricular systolic time (PLVST) for a cardiac cycle corresponding to a relation between a systolic interval time interval and a cardiac cycle time interval. A cardiac status is determined based on the calculated PLVDT (or PLVST) and on an activity level of the patient. | 06-21-2012 |
20120221071 | METHOD AND SYSTEM FOR ADAPTING PACING SETTINGS OF A CARDIAC STIMULATOR - In an implantable medical device, such as a cardiac stimulator such as a pacemaker, and method for predicting patient responses to physical exertion, the patient response is monitored over time to evaluate disease progression and pacing therapies of cardiac stimulators are adapted based on the predicted patient response. A current cardiac status indicator for the patient is created indicating a response of the patient to an increased physical activity as a primarily heart rate response or as a primarily a stroke volume response. The pacing parameters of the cardiac stimulator can thereafter be adapted depending on the current cardiac status indicator, wherein the adapted pacing parameters include a first pacing setting if the current cardiac status indicator indicates a primarily heart rate response or a second pacing setting if the current cardiac status indicator indicates a primarily stroke volume response. | 08-30-2012 |
20130046194 | Arrhythmia Classification - An implantable medical device ( | 02-21-2013 |
20130060118 | IMPLANTABLE MEDICAL DEVICE AND METHOD COMPRISING MEANS FOR DETECTING AND CLASSIFYING AN ARRHYTHMIA - An implantable medical device ( | 03-07-2013 |
20130325359 | HEMODYNAMIC STATUS ASSESSMENT - A patient-specific hemodyanmic status model is determined from impedance data collected during periods of normal and abnormal hemodynamic status by deriving parameter values of a set of multiple impedance-derivable parameters from impedance signals collected during periods of normal hemodynamic status and in connection with periods of abnormal hemodynamic status. The parameter values are employed to estimate coefficients of a linear parametric status model. These coefficients can then be used together with parameter values determined from impedance signals determined during status assessment periods in order to determine a current hemdoynamic status of the patient. | 12-05-2013 |
20140257423 | METHOD AND SYSTEM FOR STIMULATING A HEART - The present invention relates generally to implantable medical devices and more particularly to systems and methods for stimulating a heart of a patient. A first ventricle is activated by delivering stimulation to at least one stimulation site, a point of time for arrival at the AV node for at least one depolarization wave resulting from the stimulation in the first ventricle is estimated and a first activation time interval substantially corresponding to the time interval required for at least one depolarization wave to travel from the stimulation site in the first ventricle to the AV node using the estimated point of time for arrival of the depolarization wave and a point of time for delivery of stimulation is computed. Thereafter, the other ventricle is stimulated by delivering stimulation to at least one stimulation site. A point of time for arrival at the AV node for at least one depolarization wave resulting from the stimulation in the other ventricle is then estimated and a second activation time interval substantially corresponding to the time required for at least one depolarization wave to travel from the stimulation site in the other ventricle to the AV node using the estimated arrival of the depolarization wave and the point of time for delivery of stimulation is computed. Based on these activation time intervals and a difference between the intervals, a pacing therapy can be determined, wherein the first ventricle is paced prior to activation of the other ventricle if the activation time difference indicates that the first activation time interval is longer than the second activation time interval and the other ventricle is paced prior to activation of the first ventricle if the activation time difference indicates that the second activation time interval is longer than the first activation time interval. | 09-11-2014 |