Patent application number | Description | Published |
20090118666 | Method and implantable device for measuring hematocrit - In a method for detecting a change of a condition of a patient using an implantable medical device being connectable to the patient in at least one electrode configuration, at least one impedance measurement session is initiated to obtain at least one impedance value corresponding to an impedance of whole blood of the patient. At least one relative or absolute value of an amount of hematocrit in the blood of the patient is calculated using the at least one impedance value. A present hematocrit level is determined dependent on the at least one hematocrit value, with a change of the condition being derived from the present hematocrit level of the patient. | 05-07-2009 |
20090281584 | IMPLANTABLE SENSOR ARRANGEMENT - An implantable medical sensor arrangement has a sensor body configured for implantation in a subject, to which at least one sensor head is connected through at least one connective wire. The sensor head(s) and at least a portion of the connective wire(s) are tightly packed and enclosed by a protective sensor shell. This sensor shell is composed of a dissolvable material that will dissolve or can be triggered to dissolve following introduction of the sensor arrangement into a subject. | 11-12-2009 |
20100016915 | MEDICAL DEVICE AND SYSTEM FOR DETERMINING A HEMODYNAMIC PARAMETER USING INTRACARDIAC IMPEDANCE - In implantable medical devices such a pacemaker or cardioverter/defibrillators (ICDs) and systems including such a device and an external programmer a measure of a hemodynamic parameter such as the cardiac output, the stroke volume, or the contractility of a patient is used to trend heart failure or in an AV/VV optimization scheme. The implantable medical device is adapted to measure the cardiac impedance and the cardiac impedance data is used to determine impedance morphology curves, which, in turn, are used to compute a measure of the hemodynamic parameter. | 01-21-2010 |
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 |
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 |
20100100146 | MEDICAL DEVICE COMPRISING AN IMPEDANCE MEASUREMENT MEANS TO MEASURE VISCERAL FAT - A medical device having an impedance measurement circuit connected to at least two intracorporeal measurement electrodes arranged to measure the impedance of tissue inside the body of a patient. The impedance measurement circuit is adapted to apply a measurement current/voltage signal to the electrodes to measure and calculate the impedance of the measurement tissue, and to apply the calculated impedance value to a storage unit. The stored impedance values are used, by an analysis unit, to measure the amount of visceral fat of the tissue object inside the body of the patient. | 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 |
20100121400 | IMPLANTABLE CARDIAC DEVICE AND METHOD FOR MONITORING THE STATUS OF A CARDIOVASCULAR DISEASE - An implantable cardiac device has a heart stimulator for electrically stimulating the heart of a patient, detector that measures a physiologic parameter that is affected by the status of a cardiovascular disease associated with sympathetic activation, a signal processor that determines at least one of a low frequency, LF, and a very low frequency, VLF, Mayer wave component in the measured parameter, and analyzer that automatically analyzes the determined Mayer wave component in relation to a predetermined reference value to determine the status of the cardiovascular disease. The detector is a cardio-mechanical parameter detector that measures, as said physiologic parameter, a mechanical change in at least one of the four chambers of the heart. In a corresponding method for monitoring the status of a cardiovascular disease associated with sympathetic activation of a patient having an implantable electric heart stimulator a physiologic parameter affected by the cardiac disease is measured. At least one of a low frequency, LF, and a very low frequency, VLF, Mayer wave component in the parameter is determined, and the wave component is analyzed in relation to a predetermined reference value to determine the status of the cardiovascular disease. A mechanical change in at least one of the four chambers of the heart is measured as the physiologic parameter. | 05-13-2010 |
20100160992 | IMPLANTABLE MEDICAL DEVICE, SYSTEM AND METHOD - In an implantable medical device and method for monitoring a lung deficiency in a patient, a housing containing a control circuit. Is implanted in a patient. The control circuit is configured to analyze one or more signals that represent the breathing of the patient. The control circuit is also configured to monitor a relationship between an expiratory phase and an inspiratory phase of the breathing cycle, or an analogous relationship, and to monitor a change in the lung deficiency by monitoring a change in this relationship. | 06-24-2010 |
20100168812 | METHOD AND DEVICE FOR COLLECTING REM SLEEP DATA - In a method and a device for trending and prediction of monitored conditions or diseases, an REM sleep detector is provided to allow data collected during REM sleep to be separated from other data so stable and uniform conditions for data collection are achieved. The REM sleep detector can advantageously be provided inside an implantable medical device. | 07-01-2010 |
20100179411 | IMPLANTABLE MEDICAL DEVICE AND A METHOD COMPRISING MEANS FOR DETECTING AND CLASSIFYING VENTRICULAR TACHYARRHYTMIAS (As Amended) - In a method and implantable medical device for ventricular tachyarrhythmia detection and classification, upon detection of a ventricular tachyarrhythmia based on an electrocardiogram signal, cardiogenic impedance data representative of ventricular volume dynamics are collected and used for classifying the detected tachyarrhythmia as stable or unstable. In the latter case but typically not in the former case, defibrillation shocks or other forms of therapy are applied to combat the unstable ventricular tachyarrhythmia. | 07-15-2010 |
20100268102 | IMPLANTABLE HEART MONITORING DEVICE, SYSTEM AND METHOD - In an implantable heart monitoring device and a monitoring method, an impedance is measured across at least part of an atrium, such that variation of the impedance is related to the volume change of the atrium. Values are stored at different occasions that indicate the rate of change of the measured impedance. The stored values are determined such that, when the device is used in a living being, the variation of the stored values will be related to the variation of the speed with which the atrium is filled with blood during the atrial diastole. | 10-21-2010 |
20100280394 | MEDICAL DEVICE FOR ATRIAL FIBRILLATION PREDICTION - In a device and a method for providing correlated measures for predicting potential occurrence of atrial fibrillation, an impedance of the patient is measured to obtain impedance information; cardiogenic data is determined from the information; respiratory data is determined from the information; at least one hemodynamic measure is calculated from the cardiogenic data and at least one apnea measure is calculated from the respiratory data; the hemodynamic and apnea measures are correlated such that the correlated measures can be utilized for predicting potential occurrence of atrial fibrillation. | 11-04-2010 |
20100286535 | MEDICAL DEVICE FOR DETECTING PULMONARY ARTERY PRESSURE - In a medical device and method to monitor pulmonary artery pressure of a patient, a first parameter related to the right ventricular straight volume of the patient's is detected, and a second parameter related to the right ventricular ejection rate of the patient's heart, or related to the workload of the patient's heart, is also determined. A pulmonary pressure index is determined by combining the first and second parameters, with variations of the pulmonary pressure index indicating variations in the pulmonary artery pressure. Pulmonary artery hypertension can be monitored with such a device and method. | 11-11-2010 |
20100298904 | IMPLANTABLE HEART STIMULATOR FOR MEASURING DYSSYNCHRONY USING IMPEDANCE - Implantable heart stimulator connectable to an electrode arrangement has a pulse generator adapted to deliver stimulation pulses to a heart of a subject; an impedance measurement unit adapted monitor at least one heart chamber of the heart of the subject to measure the impedance in the at least one monitored heart chamber for generating an impedance signal corresponding to the measured impedance. The impedance signal is applied to a processor where the signal is processed, according to specified criteria, and a fractionation index value is determined represented by the curve length of the impedance signal during a predetermined measurement period. The fractionation index value is a measure of different degrees of mechanical dyssynchrony of the heart. | 11-25-2010 |
20100324442 | MONITORING MECHANICAL HEART PROPERTIES - In a method and system for monitoring mechanical properties of a heart in a subject, multiple cardiogenic impedance values reflective of the impedance of the heart in connection with a transition from inhalation to exhalation in the subject are determined. Correspondingly, multiple cardiogenic impedance values reflective of the impedance of the heart in connection with a transition from exhalation to inhalation are determined. The impedance values are collectively processed to form a trend parameter. The value determination and processing is performed over several respiratory cycles spaced apart in time to form a plurality of trend parameters over time. The mechanical properties of the heart are monitored by processing these different trend parameters. The data collection and optionally at least a part of the data processing is performed by an implantable medical device. | 12-23-2010 |
20100331719 | METHOD AND IMPLANTABLE MEDICAL DEVICE (IMD) FOR MONITORING PERMEABILITY STATUS OF CELL MEMBRANES - An implantable medical device comprises a signal generator for generating a current signal having a frequency in a frequency window slightly less than the β-dispersion frequency of a tissue and applying the signal over the tissue. A signal measurer measures the resulting voltage signal and an impedance parameter is calculated from the applied and measured signal by a parameter determiner. A status monitor monitors the permeability status of cell membranes in the tissue based on this impedance parameter. | 12-30-2010 |
20100331909 | ANTI-ARRHYTHMIA IMPLANTABLE MEDICAL DEVICE - An implantable medical device has a detector for detecting an arrhythmia event of a subject's heart and generating an arrhythmia signal based on the detected event. An impedance determining unit determines impedance data representative of blood aggregation level of blood present in a cavity, such as heart chamber, of the subject. An anti-arrhythmia unit of the device is arranged for applying electric anti-arrhythmia treatment to at least a portion of the heart. This unit is conditionally operable based on the arrhythmia signal and the impedance data. The risk blood aggregates and clots obstructing blood vessels following anti-arrhythmia treatment is significant reduces by conditioning the treatment based on the aggregation level representing impedance data. | 12-30-2010 |
20110028855 | HEART FAILURE DETECTING MEDICAL DEVICE - An implantable medical device has an event detector that detects a predetermined cardiac event during a heart cycle of a subject. A reference time is assigned to this detected cardiac event. An onset detector detects the onset of ventricular filling of the heart during the heart cycle. The relative time of the detected filling onset is determined based on the assigned time reference. An increased risk of heart failure of the subject is automatically determined based on the determined relative time for the filling onset. Generally, a reduction in the relative time, as determined at different points in time, indicates an increased heart failure risk or the presence of a heart failure condition. | 02-03-2011 |
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 |
20110106232 | METHOD AND DEVICE FOR ESTIMATING A MYOCARDIAL PERFORMANCE PARAMETER - An implantable medical device applies an electric signal to at least a portion of a heart in a subject. A resulting electric signal is collected from the heart and is used together with the applied signal for determining a cardiogenic impedance signal. The impedance signal is processed in order to estimate an isovolumetric contraction time, an isovolumetric relaxation time and an ejection time for a heart cycle. These three time parameters are employed for calculating a Tei-index of the heart. The Tei-index can be used as myocardial performance parameter in heart diagnosis and/or cardiac therapy adjustment. | 05-05-2011 |
20110144508 | METHOD AND DEVICE FOR MONITORING ACUTE DECOMPENSATED HEART FAILURE - An implantable medical device has an impedance determiner for determining a cardiogenic impedance signal based on electric signals sensed by connected electrodes. A parameter calculator processes the impedance signal to calculate an impedance parameter representative of the cardiogenic impedance in connection with the diastolic phase of a heart cycle. This parameter is then employed by the device for monitoring acute decompensated heart failure status of a subject. | 06-16-2011 |
20110184301 | HEART FAILURE DETECTOR - In an apparatus and method for detecting incipient heart failure of a patient. Impedance signals reflecting volume changes of the right ventricle and/or the right atrium of a heart of the patient are obtained. The impedance signals are processed to determine a first impedance parameter substantially reflecting a volume of the right ventricle, and a heart failure status is determined based on the first impedance parameter, wherein a decreasing first impedance parameter is determined to be an indication of a deterioration of the heart failure status. | 07-28-2011 |
20110202102 | METHOD AND IMPLANTABLE DEVICE FOR SELECTIVE HEART PACING - An implantable medical device measures an AV delay in connection with measurement of N physiological patient parameters. The parameters are used for identifying a sub-space of an N-dimensional parameter space. An expected AV delay is assigned to the identified sub-space based on the measured AV delay, where the parameter space with expected AV delays constitute decision support information to be used by the device for performing a selective heart pacing. This selective pacing is performed based on a priori probability determined using the support information and a measured set of N parameters. The a priori probability represents the probability of successful AV conduction at a current patient condition determined based on the measured parameters. | 08-18-2011 |
20110237968 | METHOD, IMPLANTABLE MEDICAL DEVICE, AND SYSTEM FOR DETERMINING THE CONDITION OF A HEART VALVE (As Amended) - An implantable medical device has an impedance processor that determines impedance data reflective of the transvalvular impedance of a heart valve of a heart during a heart cycle. The determined impedance data are processed by a representation processor that estimates diastolic and systolic transvalvular impedance representations. A condition processor determines the presence of any heart valve malfunction, such as valve regurgitation and/or stenosis, of the heart valve based on the estimated diastolic and systolic transvalvular impedance representations. | 09-29-2011 |
20120059272 | MEDICAL DEVICE AND METHOD FOR DETERMINING A DYSSYNCHRONICITY MEASURE TECHNICAL FIELD - In an implantable medical device, such as a bi-ventricular pacemaker and a method for detecting and monitoring mechanical dyssynchronicity of the heart, a dyssynchronicity measure indicating a degree of mechanical dyssynchronicity of a heart of a patient is calculated. A first intracardiac impedance set is measured using electrodes placed such that the first intracardiac impedance set substantially reflects a mechanical activity of the left side of the heart and a second intracardiac impedance set is measure using electrodes placed such that the second intracardiac impedance set substantially reflects a mechanical activity of the right side of the heart. The measure of a dyssynchronicity is calculated based on a resulting parameter set from a comparison between at least a subset of the first and the second impedance sets, respectively, the subsets containing information of the mechanical systole, wherein a reduced dyssynchronicity measure corresponds to an improved synchronicity between the right side and the left side of the heart. | 03-08-2012 |
20120083703 | IMPLANTABLE CORONARY PERFUSION MONITORING DEVICE - An implantable coronary perfusion monitoring device for in-vivo determination of a coronary perfusion index (CPI) indicative of the coronary perfusion of a heart has a time measurement unit to determine a blood pressure reflection wave measure t indicating the timely position in the heart cycle of the maximum of a reflected blood pressure wave and in a time period starting at a preset point of time in systole and ending at a local maximum of blood pressure following aortic valve closure and, a diastolic peak pressure measurement unit adapted to determine a diastolic peak blood pressure measure DPP related to diastolic aortic peak pressure and a systolic arterial pressure measurement unit adapted to determine a systolic arterial blood pressure measure SAP related to systolic arterial pressure, and a coronary perfusion index calculating unit adapted to determine said coronary perfusion index CPI as (t·DPP)/SAP. | 04-05-2012 |
20120101397 | LATE POTENTIAL DETECTION - A late potential detecting system has an implantable medical device connected to at least one cardiac lead having implantable electrodes positioned at different sites of a ventricle myocardium. A sampling unit of the implantable medical device records electrogram samples for the different implantable electrodes to get different sample sets. The electrogram samples of the sample sets are time synchronized and magnitude potential representations of the potential data of the electrogram samples are determined. The magnitude potential representations of the time synchronized electrogram samples are then co-processed and used for determining a parameter that is indicative of any late potentials of the monitored ventricle. | 04-26-2012 |