Patent application number | Description | Published |
20120004700 | IDENTIFICATION OF PACING SITE - An implantable medical device applies an electric signal over two electrodes and measures the resulting electric signal over a candidate pair of neighboring electrodes on a lead for a first heart ventricle or over a candidate electrode of the lead and a case electrode. An impedance signal is determined for each candidate pair or electrode based on the applied signal and the measured resulting signal. A time difference between start of contraction in a second ventricle and the timing of local myocardial contraction as identified from the impedance signal at the site of the candidate pair or electrode is determined for each candidate pair or electrode. An optimal pacing electrode is selected to correspond to one of the electrodes of the candidate pair having the largest time difference or the candidate electrode having largest time difference. | 01-05-2012 |
20120035493 | NEAR FIELD-BASED SYSTEMS AND METHODS FOR ASSESSING IMPEDANCE AND ADMITTANCE FOR USE WITH AN IMPLANTABLE MEDICAL DEVICE - A new model is provided for understanding and exploiting impedance or admittance values measured by implantable medical devices, such as pacemakers or cardiac resynchronization devices (CRTs.) The device measures impedance along vectors extending through tissues of the patient between various pairs of electrodes. The device then converts the vector-based impedance measurements into near-field individual electrode-based impedance values. This is accomplished, in at least some examples, by converting the vector-based impedance measurements into a set of linear equations to be solved while ignoring far-field contributions to the impedance measurements. The device solves the linear equations to determine the near-field impedance values for the individual electrodes, which are representative of the impedance of tissues in the vicinity of the electrodes. The device then performs or controls various device functions based on the near-field values, such as analyzing selected near-field values to detect heart failure or pulmonary edema. | 02-09-2012 |
20120078321 | SYSTEM AND METHODS OF STIMULATING A HEART - A cardiac stimulator is connected to a hemodynamic sensor to sense hemodynamic signals. An optimization module determines recommended AV and VV delays based on IEGM signals. A data processing module determines a delay control parameter for each preset AV delay and VV delay based on the collected hemodynamic signals for respective preset AV delay and VV delay, determines the AV delay setting that corresponds to the maximum delay control parameter and the VV delay setting that corresponds to the maximum delay control parameter, determines an AV delay error correction value as a difference between the AV delay corresponding to the maximum delay control parameter and a recommended AV delay, and determines a VV delay error correction value as a difference between the VV delay corresponding to the maximum delay control parameter and a recommended VV delay. | 03-29-2012 |
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 |
20130023947 | Implantable Heart Stimulator - Implantable heart stimulator comprising a control unit including a memory, a sensing unit, a pulse stimulation unit adapted to generate stimulation pulses separated by a variable predetermined pacing interval (PI), and also a method in a heart stimulator. The heart stimulator is adapted to be connected to one or many heart electrode leads provided with stimulating and sensing electrodes in order to stimulate heart tissue by said stimulation pulses and sense electrical heart events. The heart stimulator comprises a control parameter measurement unit adapted to derive a control parameter value indicative of end-diastolic pressure (EDP). At specified intervals, the control unit is adapted to vary the predetermined pacing interval (PI) according to a predetermined pacing interval (PI) search session scheme, and that control parameter values are determined, by said control parameter measurement unit at the different pacing intervals tested during said PI search session, and in that determined control parameter values and corresponding pacing intervals are stored in said memory. The maximum control parameter value obtained during one PI search session is determined and the corresponding pacing interval, denoted PI | 01-24-2013 |
20130053917 | PHYSIOLOGICALLY ADAPTED CARDIAC RESYNCHRONIZATION THERAPY - An implantable medical device is connectable to an epicardial left ventricular lead having at least one epicardial electrode and a myocardium penetrating catheter with at least one endocardial electrode and present in a lumen of the lead. The device comprises a pulse generator controller that controls a ventricular pulse generator to generate pulses to be applied to the epicardial and endocardial electrodes. The controller uses an endocardial-to-epicardial time interval or epicardial-to-endocardial time interval to coordinate endocardial and epicardial activation of the left ventricle to thereby achieve cardiac pacing that closely mimics the natural electrical activation pattern of a healthy heart. | 02-28-2013 |
20130158620 | METHOD AND SYSTEM FOR STIMULATING A HEART OF A PATIENT - In an implantable medical device and a method for stimulating a heart of a patient, at least one left atrial pressure (LAP) signal over a cardiac cycle is obtained. The A-wave is identified using the LAP signal and a maximum positive rate of change of the A-wave of the LAP signal is determined. The maximum positive rate of change of the A-wave corresponds to the rate which the pressure in the atrium raises as the atria contraction forces more blood into the ventricle during the very last stage of diastole. Further, AV and/or VV delay is adjusted in response to the maximum positive rate of change of the A-wave, wherein a reduction of the maximum positive rate of change of the A-wave indicates an AV and/or VV delay providing an enhanced hemodynamic performance. | 06-20-2013 |
20130165776 | CONTRACTION STATUS ASSESSMENT - An implantable medical device receives at least one sensor signal representing inter-movement between a basal region of a heart ventricle and a ventricle apex during at least a portion of a systolic phase of a cardiac cycle. A parameter processor calculates a contraction status parameter value based on the at least one sensor signal. This contraction status parameter value represents an elongation of the ventricle following onset of ventricular activation during a cardiac cycle. The contraction status parameter value is stored in a memory as a diagnostic parameter representing a current contraction status of a subject's heart. | 06-27-2013 |
20130184545 | SYSTEM AND METHOD FOR DETECTING PULMONARY CONGESTION BASED ON STROKE VOLUME USING AN IMPLANTABLE MEDICAL DEVICE - Techniques are provided for detecting pulmonary congestion based on an increase in right ventricular (RV) stroke volume over left ventricular (LV) stroke volume. In one example, the device generates an index based on accumulated differences between RV stroke volume and LV stroke volume while RV stroke volume exceeds LV stroke volume, such that the index is indicative of an ongoing imbalance between RV and LV stroke volume. The index is compared to a suitable threshold to detect a severe imbalance indicative of pulmonary edema. Additionally, techniques are described for estimating RV and LV stroke volumes based on pulmonary artery pressure, left atrial pressure, aortic pressure, LV strain or on various intracardiac or extracardiac impedance measurements. | 07-18-2013 |
20130211472 | CARDIAC RESYNCHRONIZATION THERAPY OPTIMIZATION - An implantable medical device, IMD, ( | 08-15-2013 |
20130225947 | IMPLANTABLE MEDICAL DEVICE - An implantable medical device comprising a coronary perfusion measurement unit is adapted to measure and determine parameters related to coronary perfusion of heart tissue. The parameters include time periods and perfusion magnitudes. The coronary perfusion measurement unit is configured to determine a time period T related to a perfusion event of a coronary vessel and including includes a reperfusion time period, where a perfusion event is defined as a decrease of coronary perfusion followed by reperfusion, and to generate a time period signal in dependence thereto. The implantable medical device further comprises a coronary flow calculation unit that is adapted to receive the time period signal and that is adapted to process the time period and to generate an ischemia risk indicating index I in dependence of the time period. | 08-29-2013 |
20130238045 | METHODS AND SYSTEMS FOR STIMULATING A HEART - The present invention relates generally to methods for implantable medical devices and more particularly to methods for optimizing stimulation of a heart of a patient. The method comprises: determining recommended pacing settings including recommended AV delays and/or recommended W delays based on IEGM data. Further, at least one hemodynamical parameter is determined based on measured at least one hemodynamical signal. Reference pacing settings are determined including reference AV delays and/or reference W delays based on said hemodynamical parameters. An AV delay correction value and a W delay correction value are calculated as a difference between recommended AV and/or VV delays and reference AV and/or W delays, respectively. The correction values are used for updating recommended AV and/or VV delays, respectively. | 09-12-2013 |
20130289641 | METHOD AND SYSTEM FOR OPTIMIZING CARDIAC PACING SETTINGS - The present invention relates generally to methods and systems for optimizing stimulation of a heart of a patient. Hemodynamical index signals reflecting a mechanical functioning of a heart of a patient are recorded at different hemodynamical states. Corresponding hemodynamical reference signals at corresponding hemodynamical states are recorded. At least one hemodynamical index parameter is extracted from the recorded hemodynamical index signals. The at least one hemodynamical index parameter is a measure of the mechanical functioning of the heart and a hemodynamical index model is created, wherein the hemodynamical index model is based on the at least one hemodynamical index parameter and a comparison between output results from the hemodynamical index model and corresponding hemodynamical reference signals. From this hemodynamical index model, a hemodynamical index can be derived, which then can be used in determining patient customized cardiac pacing settings of the cardiac stimulator. | 10-31-2013 |
20130345582 | IMPLANTABLE HEART MONITORING DEVICE AND METHOD - In an implantable heart monitoring device and method, particularly for monitoring diastolic dysfunction, a control circuit (a) detects the heart rate, (b) derives information correlated to the stroke volume of the heart at the detected heart rate, and (c) stores the detected heart rate and the derived information correlated to the stroke volume in a memory. The control circuit automatically implements (a), (b) and (c) at a number of different occasions for a number of different, naturally varying heart rates, so that the memory contains information indicating the stroke volume as a function of the heart rate. | 12-26-2013 |
20140257070 | PROCESSING OF LAP SIGNALS - Cardiac valve events are monitored by recording a left atrial pressure (LAP) representing signal using an implantable pressure sensor ( | 09-11-2014 |