Abstract:
A leadless cardiac pacemaker (LCP) may be deployed within a patient's vasculature at a location near the patient's heart in order to pace the patient's heart and/or to sense electrical activity within the patient's heart. In some cases, an LCP may be implanted within the patient's superior vena cava or inferior vena cava. The LCP may include an expandable anchoring mechanism configured to secure the LCP in place.
Abstract:
An implantable device and associated is disclosed. The device comprises a set of electrodes spatially separated from one another and all coupled to an implantable pulse generator. The device comprises a processor configured for forming a first pacing vector and a second pacing vector. The pulse generator is configured to deliver first pacing pulses to the first pacing vector and delivering second pacing pulses to the second pacing vector. The pulse generator generates a recharging current for recharging a first coupling capacitor over a first recharge time period and another recharging current for recharging a first coupling capacitor over a second recharging time period. An order of recharging the first and second coupling capacitors is dependent upon one of ventricular pacing mode, left ventricle to right ventricle delay (V-V) pace delay, multiple point LV delay and latest delivered pacing pulses to one of the first and second pacing vectors.
Abstract:
An example of a system for pacing through multiple electrodes in a ventricle includes a sensing circuit to sense cardiac signal(s), a pacing output circuit to deliver pacing pulses, a heart sound sensor to sense a heart sound signal, and a control circuit to control the delivery of the pacing pulses. The control circuit includes a heart sound detector to detect heart sounds using the heart sound signal, an electrical event detector to detect cardiac electrical events using the cardiac signal(s), a measurement module to measure an optimization parameter using the detected heart sounds, and an optimization module to approximately optimize one or more pacing parameters using the measured optimization parameter. The one or more pacing parameters include an electrode configuration parameter specifying one or more electrodes selected from the multiple electrodes in the ventricle for delivering ventricular pacing pulses to that ventricle.
Abstract:
Systems and methods for modulating a physiological process are provided to enable precise delivery of signals to a predetermined treatment site. The systems may comprise an implantable device and an electrical lead body. The electrical lead body may comprise a plurality of transducer contacts in close proximity to an end of the electrical lead body, and a control unit positioned within the lead body in close proximity to the plurality of transducer contacts.
Abstract:
Systems and methods are provided for evaluating an expected effectiveness of cardiac resynchronization therapy. Electrocardiogram (ECG) data is received as at least one ECG lead from a set of electrodes. A frequency spectrum representing the ECG data is generated via a Fourier transform. At least one predictor value is extracted from the calculated frequency spectrum. A fitness parameter, representing the expected effectiveness of cardiac resynchronization, is determined from at least the extracted predictor value.
Abstract:
Generally, the disclosure is directed one or more methods or systems of cardiac pacing employing a right ventricular electrode and a plurality of left ventricular electrodes. Pacing using the right ventricular electrode and a first one of the left ventricular electrodes and measuring activation times at other ones of the left ventricular electrodes. Pacing using the right ventricular electrode and a second one of the ventricular electrodes and measuring activation times at other ones of the left ventricular electrodes. Employing sums of the measured activation times to select one of the left ventricular electrodes for delivery of subsequent pacing pulses.
Abstract:
A medical device and associated method control the delivery of a cardiac pacing therapy by selecting first and second pacing sites along a first ventricle of a patient's heart and delivering the pacing therapy by pacing the first ventricle using the first pacing site during the periods of a first ventricular pacing mode and using the second pacing site during periods of a second ventricular pacing mode. In one embodiment, the device determines activation times at multiple sites along a ventricle in response to pacing pulses being delivered to the opposite ventricle. A first pacing site is selected in response to the activation time determination. The device delivers the pacing therapy by pacing the first ventricle using the first pacing site during periods of the first ventricular pacing mode.
Abstract:
The disclosure describes circuits for providing therapy in an implantable medical device. The illustrative circuits include features that provide fault tolerance with graceful degradation as well as switching control methods that reduce component count and improves reliability. Fault detection circuit 130 functions to monitor the components of output circuits (such as hold capacitors 102, or tip capacitors 106) in order to detect any abnormalities associated with the operation of the components. In response to detecting a component abnormally, fault detection circuitry 130 transmits a signal to a controller/timer circuit, with the signal being utilized in one embodiment to reconfigure the coupling of the components in the output circuits such that the component (s) that are determined to exhibit an abnormality are switched out of the output circuits.
Abstract:
Various techniques are disclosed for facilitating selection of at least one vector from among a plurality of vectors for pacing a chamber of a heart. In one example, a method includes presenting, by a computing device, a plurality of criteria by which each of the plurality of vectors may be prioritized, selecting at least one criterion from among a plurality of criteria by which each of the plurality of vectors may be prioritized, measuring the at least one selected criterion for each of the plurality of vectors, and automatically prioritizing, by the computing device, the plurality of vectors based on the measurement of the at least one selected criterion.
Abstract:
Heart stimulating device comprising a stimulation pulse generator arranged in a stimulator housing (2), where the heart stimulating device being connectable to a plurality of stimulation and sensing electrodes (5, 6, 7, 8, 9, 10, 11, 12) arranged at one or many leads (3, 4, 13), the electrodes being adapted to be arranged in connection with the heart to stimulate the heart. The device further comprises a sensing unit adapted to sense electrical heart tissue responses to applied electrical stimulation pulses via said electrodes. The pulse generator is adapted to generate stimulation pulses to be applied to the heart tissue by different electrodes, and for each of the applied pulses resulting in a depolarization wave in the heart tissue a depolarization wave velocity, or a depolarization wave velocity measure, of the wave is determined by the sensing unit and stored in a memory unit. The stored wave velocities, or velocity measures, related to different stimulating electrodes, are compared to each other in a comparison unit and the comparison is used to adapt a stimulation mode when stimulating the heart to optimize the hemodynamic performance of the heart.