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5916237 |
Power control apparatus and method for a body implantable medical device
An apparatus and method for controlling power in digital logic circuitry is disposed in a body implantable biomedical device disclosed. A power switch, such as a power gating transistor, is coupled...
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5897575 |
Arrhythmia classification system with reliability indication that allows for low quality input signals in pacemakers
An implantable cardiac device wherein a reliability indicator is developed for cardiac classification based on the presence or absence of noise. If the classification is unreliable a robust therapy...
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5891169 |
Method of processing signals characteristic of cardiac activity and an associated device
A method for processing a signal characteristic of cardiac activity in the atrium (A) and/or ventricle (V) of a heart (H) and for evaluating this signal with a view to obtaining a control signal...
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5891171 |
Apparatus with noise classification in an implantable cardiac device by using an amplifier with a variable threshold
An implantable cardiac device includes electrodes for sensing and pacing the heart, and optionally, defibrillation electrodes. The IECG with a noise component sensed in the heart is processed to...
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5891170 |
Method and apparatus for advanced tachyarrhythmia discrimination
An active implantable medical device of the defibrillator/cardiovertor type with advanced tachycardia discrimination in which the device monitors the atrial and ventricular activity, suspects and...
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5882352 |
Automatic adjustment of detection rate threshold in an implantable antitachycardia therapy device
An antitachycardia stimulation device that automatically adjusts its detection rate threshold as a function of a sensed physiological parameter indicative of cardiac rate. The implantable...
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5855592 |
Systems and methods for multi-site cardiac defibrillation using multiple electrode structures
Systems and methods achieve defibrillation of a heart tissue region without resort to drugs or a painful electrical shock. The systems and methods sense electrical activity in the heart tissue...
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5840079 |
Method and apparatus for treatment of atrial fibrillation
A method of and apparatus for delivering ventricular pacing pulses to terminate high rate atrial tachyarrhythmias including fibrillation or flutter or to reduce the requirements for termination of...
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5836971 |
Dynamic rezoning of a tiered therapy inplantable cardioverter defibrillator/pacemaker (ICD) device
An implantable cardioverter/defibrillator/pacemaker (ICD) device having tiered level therapies, detects an arrhythmia through an electrode adapted to be coupled to a patient's heart. An output...
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5833710 |
Protection circuit for implantable electronic device
The invention protects circuits connected to low energy stimulating (pacing) or detection (sensing) electrodes of an implantable medical device from high energy pulses generated by the device...
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5824014 |
Medical therapy device producing a variable therapy in response to measured sensor values corrected with temporal fluctuation values
A medical therapy device includes at least one sensor for detecting a varle that can be measured on the body of a patient. An evaluating and control device is connected to the output of the sensor....
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5814079 |
Cardiac arrhythmia management by application of adnodal stimulation for hyperpolarization of myocardial cells
An anodal stimulation method and apparatus for the prevention or treatment of tachyarrhythmias using anodal stimulation (AS) energy for effecting hyperpolarization of myocardial cells of a heart...
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5814082 |
Layered capacitor with alignment elements for an implantable cardiac defibrillator
A capacitor for an implantable cardiac defibrillator with a housing defining a chamber. A plurality of flat, stacked, charge storing layers reside within the chamber. Each of the layers includes at...
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5797967 |
System and method to reduce defibrillation requirements
A hybrid tachyarrhythmia therapy utilizes a combination of two therapies: pacing therapy (optionally followed by therapy employing waveforms having morphologies congruent to defibrillation...
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5792183 |
Combination pacemaker and defibrillator having dynamic ventricular refractory period
An implantable cardiac stimulator having a bradycardia pacer and a defibrillator in a common housing and sharing common atrial and ventricular sense circuits includes circuitry for defining a...
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5782876 |
Method and apparatus using windows and an index value for identifying cardic arrhythmias
A method and apparatus for identifying cardiac arrhythmias. In the preferred embodiment the invention is embodied in an implantable pulse generator. The IPG features a system to analyze the sensed...
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5772689 |
Implantable cardioverter-defibrillator with apical shock delivery
An implantable electrical device comprising an RV coil and a pacing probe. The RV coil provides defibrillation and cardioversion waveforms to the heart and the pacing probe provides pacing signals...
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5766224 |
Temporary, post-heart surgery cardioverting and pacing system and lead systems for use therein
A post-surgical atrial cardioverting, atrial pacing, and ventricular pacing system and lead system provides for cardioverting the atria, pacing the atria, and/or pacing the ventricles of the heart...
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5766225 |
System and method for distinguishing between VF/VT bradycardia or asystole
A system and method for more reliably detecting and treating arrhythmias such as ventricular fibrillation and tachycardia are provided. The system reacts to the detection of VF/VT by first looking...
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5713925 |
Adapter for isolating pacing and defibrillation signals
An adapter for connecting combination electrodes to a defibrillator/monitor/pacer. The adapter isolates the pacer from the defibrillator when a defibrillation pulse is applied over the combination...
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5713929 |
Arrhythmia and fibrillation prevention pacemaker using ratchet up and decay modes of operation
New pacing algorithm defines faster than indicated pacing rate during detection of PAC's/PVC's and reduces rate after awhile to a safety rate unless natural depolarizations are detected.
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5713924 |
Defibrillation threshold reduction system
A method an apparatus for treating fibrillation, particularly atrial fibrillation. In response to detection of fibrillation, a high frequency, low energy pulse burst is delivered via pacing...
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5709709 |
ICD with rate-responsive pacing
An implantable cardioverter defibrillator (ICD) system features rate-responsive pacing capabilities. An electrical pulse generating device having a housing containing pulse generating circuitry is...
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5690683 |
After potential removal in cardiac rhythm management device
An apparatus effectively removes after potential occurring after a electrical pulse is delivered in a cardiac rhythm management system such as a pacemaker system or cardioverter/defibrillator...
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5676687 |
Post atrial cardioversion high rate atrial pacing with gradual rate return
An implantable atrial defibrillator includes a cardiovertor for applying cardioverting electrical energy to the atria of a heart when the atria are in need of cardioversion. The defibrillator...
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5674251 |
Method and apparatus for treatment of atrial fibrillation
A pacemaker system adapted to deliver pacing pulses in the presence of fibrillation. The pacing pulses are delivered via large surface area electrodes of the type normally used to accomplish...
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5653737 |
Programmable pacemaker for noninvasive EP testing for atrial tachycardias with ventricular support
A programmable pacemaker that allows both noninvasive electrophysiological ("EP") testing for atrial tachycardias and ventricular pacing support, by allowing operation in the atrial channel to be...
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5649966 |
Method and apparatus for applying electrical signals to a heart for therapy or diagnosis
In a method and apparatus for stimulating and/or diagnosing the heart, a voltage is applied to the heart over at least a selected portion of the heart during an activation interval with a rise and...
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5645569 |
Post atrial cardioversion atrial pacing and method
An implantable atrial defibrillator includes a cardiovertor for applying cardioverting electrical energy to the atria of a heart when the atria are in need of cardioversion. The defibrillator...
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5607385 |
Device and algorithm for a combined cardiomyostimulator and a cardiac pacer-carioverter-defibrillator
A device and algorithm for a combined cardiomyostimulator and a cardiac pacer-cardioverter-defibrillator. In particular the present device operates, in a first embodiment, to deliver stimulation to...
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5603725 |
Circuit for measuring impredance in the heart
A circuit for determining the impedance in a heart having a pacemaker electrode to which voltages are applied disposed in the ventricle chamber thereof. The circuit uses the pacemaker electrode....
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5593428 |
Emergency external cardiac defibrillator and pacing method and apparatus
An emergency external defibrillator and pacing apparatus for applying electrical stimulation to a heart. The apparatus includes a tubular sleeve having an axial passage therethrough, which is...
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5591215 |
Apparatus and method for detection of atrial fibrillation by ventricular stability and ventricular pacing
A cardiac implant device is provided in which the ventricular rate is monitored to differentiate between atrial fibrillation and ventricular tachycardia or other cardiac conditions. For this...
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5584867 |
Method and apparatus for controlling a double atrial triple chamber cardiac pacemaker having a fallback mode
Control of a double atrial triple chamber cardiac pacemaker having a programmable fallback mode. The triple chamber pacemaker has a right atrial electrode and a left atrial electrode connected to...
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5578061 |
Method and apparatus for cardiac therapy by stimulation of a physiological representative of the parasympathetic nervous system
A device for heart therapy has a tacharrythmia detector unit, a control unit and a current generator. The current generator controlled by the control unit emits via an electrode system a first,...
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5562595 |
Multiple therapy cardiac assist device having battery voltage safety monitor
A cardiac assist system which provides simultaneous cardiac assistance during a confirmed cardiac arrythmia, but which provides for the inhibition of the cardiac assistance in the event battery...
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5549641 |
Atrial fibrillation type selective cardiovertor and method
An atrial cardiovertor/defibrillator provides therapy to the atria corresponding to the type of atrial arrhythmia occurring in the atria of the heart. The atrial cardiovertor/defibrillator includes...
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5549653 |
Muscle stimulation electrode for implantable cardial stimulation device with warning system
A cardiac simulation system with a patient warning apparatus, including a pin electrode insertable into a standard female socket in the header of a dual chamber pacer or multi-function cardiac...
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5549646 |
Periodic electrical lead intergrity testing system and method for implantable cardiac stimulating devices
A periodic electrical lead integrity testing system is provided which periodically tests electrical leads used with an implantable cardiac stimulating device. The system is especially advantageous...
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5545181 |
Implantable defibrillator/pacer using negative voltage supplies
A configuration for generating single capacitor multiphasic shocks is disclosed, using an H-bridge with four switches to connect an energy storage capacitor to a load with selectable polarity. The...
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5545182 |
Cardioverter/defibrillator shock timing function
An implantable automatic cardioverter/defibrillator device for a cardiac patient is automatically responsive to sensing of electrical cardiac activity of the heart of a patient in which the device...
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5545183 |
Method and apparatus for delivering defibrillation therapy through a sensing electrode
A pulse generator circuit and method for using a defibrillation lead positioned close to the right ventricular apex to optimize energy delivery and sensing. This method includes operating a...
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5527345 |
Implantable atrial defibrillator having an intermittenly activated pacing modality
An implantable atrial defibrillator applies cardioverting electrical energy to the atria of a human heart in need of cardioversion and thereafter paces the heart in a demand mode. The atrial...
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5507780 |
Selective default data storage for an implantable atrial defibrillator
A defibrillator, such as an atrial defibrillator, applies cardioverting electrical energy to the atria of a heart when the atria are in need of cardioversion. The atrial defibrillator includes an...
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5500004 |
Cardio myostimulation system with defibrillation
A pacemaker system for a heart having an external muscle is used to control pacing of the heart during normal or even arrhythmic modes. In these modes, the muscle is stimulated synchronously with...
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5486198 |
Atrial defibrillator and method for providing interval timing of successive intervals prior to cardioversion
An atrial defibrillator and method provides cardioverting electrical energy to the atria of a human heart after timing successive R to R intervals. A detector detects ventricular activations of the...
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5472453 |
Medical interventional device with accelerometer for providing cardiac therapeutic functions
A medical interventional device adapted to be implanted in the body of a patient provides a plurality of cardiac therapeutic functions including bradycardia pacing, rate adaptive pacing,...
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5470342 |
Adaptive refractory period within implantable cardioverter-defibrillator
An implantable cardioverter-defibrillator (ICD) adaptively adjusts the refractory period and sensitivity setting of its sensing channel in order to optimally detect depolarization signals...
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5464431 |
Atrial fibrillation detector
An atrial defibrillator implantable beneath the skin of a patient includes an intervention sequencer for performing an intervention sequence. The intervention sequencer includes an atrial...
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5464429 |
Apparatus for producing heart defibrillation sequences from stimulation pulses and defibrillation shocks
An apparatus for producing heart defibrillation sequences formed of stimulation pulses and defibrillation shocks contains a unit for delivering pulses through an intracardiac or epicardiac...
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