Patent application number | Description | Published |
20080269815 | Method and Apparatus for Providing Extra Systolic Stimulation - An implantable medical device and associated method control the delivery of extra systolic stimulation by determining a coupling interval, setting an extra systolic interval in response to the coupling interval; and delivering a supraventricular stimulation pulse upon expiration of the extra systolic interval. The supraventricular stimulation pulse evokes a depolarization that is conducted to the ventricles occurring at a ventricular coupling interval relative to a ventricular event. | 10-30-2008 |
20100004515 | Classification of Severity of Medical Condition by Wavelet Based Multi-Resolution Analysis - A system and method are provided for classifying the severity of a medical condition detected by a medical device using wavelet based multi-resolution analysis of biomedical signals. Biomedical signals are converted into a set of wavelet coefficients including scales of wavelet coefficients at different resolutions ranging from a finest scale to a coarsest scale. Features of the biomedical signal useful in diagnosing a biomedical condition are identified by determining whether corresponding identifying features appear in at least one of the plurality of scales of wavelet coefficients. The identifying features determined to appear in the various scales of wavelet coefficients are conditionally linked together and used to classify a degree of severity of a diagnosed biomedical condition based on the number of identifying features appearing in different scales of wavelet coefficients. In some embodiments, alerts can be generated based on the diagnosed degree of severity of the biomedical condition. | 01-07-2010 |
20100155204 | MULTI-STABLE MICRO ELECTROMECHANICAL SWITCHES AND METHODS OF FABRICATING SAME - A micro electromechanical (MEMS) switch suitable for use in medical devices is provided, along with methods of producing and using MEMS switches. In one aspect, a micro electromechanical switch including a moveable member configured to electrically cooperate with a receiving terminal is formed on a substrate. The moveable member and the receiving terminal each include an insulating layer proximate to the substrate and a conducting layer proximate to the insulating layer opposite the substrate. In various embodiments, the conducting layers of the moveable member and/or receiving terminal include a protruding region that extends outward from the substrate to switchably couple the conducting layers of the moveable member and the receiving terminal to thereby form a switch. The switch may be actuated using, for example, electrostatic energy. | 06-24-2010 |
20100249882 | Acoustic Telemetry System for Communication with an Implantable Medical Device - A telemetry module of an IMD operating in accordance with the techniques of this disclosure receives an unmodulated acoustic carrier signal from another device and modulates a reflected portion of the acoustic carrier signal with data for transmission to the other device. In one instance, the telemetry module may modulate the reflected portion of the carrier signal with data by selectively adjusting a reflectance of the transducer of the IMD. For example, the IMD may set the reflectance to be high or low depending on the information, e.g., digital | 09-30-2010 |
20110105860 | DETECTING WORSENING HEART FAILURE - A method comprises monitoring a heart rate, a respiration rate and an activity level of a patient, comparing the monitored heart rate, respiration rate and activity level to a predetermined threshold zone which is a function of heart rate, respiration rate and activity level, determining the patient is experiencing worsening heart failure when the monitored heart rate, respiration rate and activity level are outside the predetermined threshold zone; and after determining the patient is experiencing worsening heart failure when the monitored heart rate, respiration rate and activity level are outside the predetermined threshold zone, issuing an alert to indicate that the patient is experiencing worsening heart failure. | 05-05-2011 |
20120029373 | PREVENTION OF FALSE ASYSTOLE OR BRADYCARDIA DETECTION - In general, this disclosure is directed to signal processing based methods to reject undersensing in a signal indicative of cardiac activity, e.g., ECG. The undersensing may be due to very small signal amplitudes or due to a sudden increase in single peak amplitude resulting in an increased sensing threshold. The undersensing may result in falsely detecting a cardiac event, e.g., asystole or bradycardia. The techniques of this disclosure monitor the behavior of the signal to determine when a detected asystole is false. | 02-02-2012 |
20120108990 | METHOD AND APPARATUS FOR REDUCING NOISE IN A MEDICAL DEVICE - A method and apparatus for detecting a cardiac event in a medical device that includes sensing a cardiac signal, detecting a cardiac event in response to the sensed signal, determining whether an interval associated with the cardiac signal is less than an interval threshold, determining a noise metric in response to an interval associated with the cardiac signal being less than the interval threshold, determining whether the noise metric is greater than a noise metric threshold, and determining whether to inhibit detecting in response to determining whether an interval associated with the cardiac signal is less than the interval threshold and determining whether the noise metric is greater than the noise metric threshold. | 05-03-2012 |
20150208938 | HYBRID BIPOLAR/UNIPOLAR DETECTION OF ACTIVATION WAVEFRONT - A bipolar electrogram and a unipolar electrogram are recorded from electrodes of a probe, and differentiated with respect to time. Peaks are identified in the differentiated bipolar electrogram. An activity window is defined that includes bipolar activity about the peaks. An extreme negative value in the differentiated unipolar electrogram within the activity window is reported as a unipolar activation onset. In one aspect, an annotation is selected from candidate minima in the differentiated unipolar electrogram within the activity window by excluding candidates that fail to correlate with activity in the bipolar electrogram. | 07-30-2015 |
20150208942 | DOUBLE BIPOLAR CONFIGURATION FOR ATRIAL FIBRILLATION ANNOTATION - Catheterization of the heart is carried out by inserting a probe having electrodes into a heart of a living subject, recording a bipolar electrogram and a unipolar electrogram from one of the electrodes at a location in the heart, and defining a window of interest wherein a rate of change in a potential of the bipolar electrogram exceeds a predetermined value. An annotation is established in the unipolar electrogram, wherein the annotation denotes a maximum rate of change in a potential of the unipolar electrogram within the window of interest. A quality value is assigned to the annotation, and a 3-dimensional map is generated of a portion of the heart that includes the annotation and the quality value thereof. | 07-30-2015 |