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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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5575766 |
Process for the nonsurgical mapping and treatment of atrial arrhythmia using catheters guided by shaped guiding introducers
A process for the treatment of atrial arrhythmia by use of ablation and/or mapping procedures comprising ablating discrete ablation tracks within the left and right atrium of the heart by use of...
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5571143 |
Heart Stimulator
A heart stimulator having a pulse generator and an electrode system, which contain at least one bipolar electrode with one pole arranged in the atrium and another pole in the ventricle, or at least...
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5556420 |
Input protection circuit for pacemaker activity sensor processing circuitry
An improved input protection circuit for use in a circuit for processing sensor signals from a piezoelectric patient activity sensor is provided. The input protection circuit includes a...
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5556419 |
Implantable cardiac stimulator with analyzer that continously compares radius of derived heart signal
A device for identifying abnormal conditions in a heart retrograde conduction and tachyarrhythmias in particular, includes a differentiating circuit electrically connected to a heart to be...
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5554176 |
Implantable electrode and sensor lead apparatus
A transvenous cardioversion lead system capable of delivering electrical energy to cardiac tissue is provided. Lead system comprises an inner conductor surrounded by an insulative layer which, in...
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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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5549648 |
Pacemaker system and method with improved detection of end of retrograde conduction
A dual chamber pacemaker system and method are provided for placing the pacemaker in an asynchronous mode when retrograde conduction is present, having the capability of detecting the onset of...
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5549647 |
Pacemaker with improved far field R wave sensing and suppression
A dual chamber pacemaker is provided with a dynamic PVARP which tracks the occurrence of high rate atrial senses within the normal PVARP range. The dynamic PVARP is a short window of about 50 ms...
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5540725 |
Upper rate response for implantable pacemaker based on atrial lock interval pacing
Atrial lock interval pacing increases stroke volume and optimizes cardiac output by providing a modified P-wave tracking mode that tracks P-waves up to a maximum instantaneous tracking rate only...
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5534018 |
Automatic lead recognition for implantable medical device
A method and apparatus for determining the availability of unipolar and/or bipolar pacing/sensing paths in a body-implantable cardiac pacing system. In one embodiment, a pacemaker system includes...
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5534016 |
Dual chamber pacing system and method utilizing detection of ventricular fusion for adjustment of the atrial-ventricular delay as therapy for hypertrophic obstructive cardiomyopathy
A dual chamber pacemaker for providing ventricular pace pulses synchronized with atrial senses or paces, and having specific control for optimizing the AV escape interval and resultant AV delay for...
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5531766 |
Implantable cardioverter defibrillator pulse generator kite-tail electrode system
An electrode system for an implantable cardioverter defibrillator. The electrode system includes a conductive structure which is physically and electrically connected to the housing or can of the...
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5531771 |
Dual chamber pacemaker system and method with improved switching between synchronous and asyncrhonous behavior
A dual chamber pacemaker system having a dynamic tracking limit, as well as a dynamic pacing limit (flywheel rate), the two dynamic limits being normally coupled to a measure of the sensed atrial...
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5527347 |
Dual chamber pacing system and method with automatic adjustment of the AV escape interval for treating cardiomyopathy
There is provided a dual chamber pacemaker system and method for ventricular pacing to provide therapy for a patient with cardiomyopathy, this system being characterized by automatically adjusting...
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5522855 |
Implantable cardiac stimulator
An implantable cardiac stimulator has an atrial electrode for placement in the atrium of a heart and a ventricular electrode for placement in the ventricle of the heart. In order to sense...
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5522857 |
Pacemaker with improved detection of and response to noise
A pacemaker system and method are provided with an improved way of detecting the presence of noise, and particularly intermittent noise. When a first signal is sensed by the pacemaker sense...
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5522856 |
Pacemaker with improved shelf storage capacity
A pacemaker has logic incorporated for holding the pacemaker circuitry, or at least a portion of such circuitry, in a low current drain "standby" mode of operation from time of fabrication until...
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5522860 |
Control of an active implantable medical device
Process of control of an implantable active medical device. The device is under the responsive control of (enslavement to) a sensed physiological parameter. A representative magnitude of the...
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5514163 |
Dual chamber pacing system and method with optimized adjustment of the AV escape interval for treating cardiomyopathy
A dual chamber pacemaker system and method are provided for HOCM and like pacing therapy, with the feature of searching or scanning values of AV escape interval to define an optimized value at...
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5514161 |
Methods and apparatus for controlling atrial stimulation in a double atrial triple chamber cardiac pacemaker
Process for controlling a double atrial triple chamber pacemaker having a right atrial electrode and a left atrial electrode connected to one and the same atrial circuit for the...
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5507784 |
Method and apparatus for control of A-V interval
A device for controlling the duration of A-V conduction intervals ia a patient's heart. Stimulation of the AV nodal fat pad is employed to maintain the durations of the A-V conduction intervals...
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5507782 |
Method and apparatus for dual chamber cardiac pacing
A dual chamber pacemaker and a method of employing the pacemaker to accomplish atrial synchronized ventricular pacing with complete ventricular capture by control of the A-V escape intervals of the...
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5503160 |
Dynamic filter for real-time artifact removal from waveforms
During sampling, a finite impulse response (FIR) filter separates a composite signal into two components, non-cardiac physiological phenomena and cardiac artifacts. The length of the filter window...
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5501701 |
Pacemaker with vasovagal syncope detection and therapy
A method and apparatus for cardiac pacing, in which pacing pulses are provided at an increased rate in response to a detected rapid drop in heart rate. A rapid drop is detected in response to heart...
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5486200 |
Automatic postmortem deactivation of implantable device
A method and apparatus for minimizing the potential for injury due to operation of a body-implantable device during explant manipulation thereof. In one embodiment of the invention, a...
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5480441 |
Rate-responsive heart pacemaker
A rate-responsive pacemaker pulse generator and lead system that allows the rate at which the pacemaker delivers electrical stimulation pulses to the heart to be adjusted as needed in order to...
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5476482 |
Pacemaker programmer-based automatic retrograde conduction measurement
A method for automatically determining the existence of retrograde conduction in a pacemaker patient. At a selected ventricular pacing rate, A-senses are detected, and V-pace to A-sense intervals...
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5466245 |
Method and apparatus to continuously optimize the A-V delay in a dual chamber pacemaker
A DDD-type cardiac pacemaker having a microprocessor-based controller is programmed to automatically determine and utilize and optimize A-V delay for the patient in whom the device is implanted....
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5464435 |
Parallel processors in implantable medical device
A multi-function implantable medical device having a plurality of microprocessors therein. The device, which may be capable of functioning as a pacemaker, cardioverter, and defibrillator, is...
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5454836 |
VDD (R) pacing system
A VDD-type pacing system which may have a floating atrial electrode analyzes P-wave events and absences of P-waves to determine data indicative of the likelihood of P-wave undersensing. The...
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5454837 |
Implantable medical system with optical communication between a treatment site and a therapy-generating apparatus
An implantable medical system, having an implanted therapy-generating apparatus which administers a medical therapy in vivo to a treatment site remote from the therapy-generating apparatus,...
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5441522 |
Pacemaker
A pacemaker for stimulating both the atrium and the chamber of a heart is able to inhibit the emission of chamber stimulating pulses if a spontaneous chamber reaction is sensed before the expiry of...
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5423870 |
Rate responsive cardiac pacemaker
A cardiac pacemaker having an automatic pulse rate response gain factor responsive to at least one cardiac-related physiological characteristic of a patient. The pacemaker includes a rate...
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5417715 |
Rate responsive heart stimulation
A rate-responsive heart stimulator with a variable stimulation interval contains a measurement device which generates a measurement signal corresponding to the volume of blood in a heart during the...
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5417716 |
Heart stimulator
In a heart stimulator which delivers stimulation pulses to a heart when the heart's spontaneous rate drops below a defined basic rate, in order to reduce the period during which the heart...
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5417714 |
DDI pacing with PVC-protected hysteresis and automatic AV interval adjustment
A dual-chamber pacemaker provides DDI pacing with PVC-protected hysteresis and automatic AV interval adjustment. An extended hysteresis atrial escape interval (AEI H ) is invoked in response to the...
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5403355 |
Implantable medical interventional device with atrial dysrhythmia therapy for tachycardia
An implantable medical interventional device for delivering electrical therapies to the heart of an implant patient to treat pathologic ventricular tachycardia. The device includes a first sensor...
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5395397 |
Method and apparatus for stimulating a heart
A heart stimulator is disclosed which is capable of sensing and stimulating both the atrium and ventricle in a heart such a way that a ventricular stimulation pulse is emitted either after a...
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5391188 |
Low cost implantable medical device
A low cost, limited-function implantable medical device. The device's synchronous circuits are driven by an ultra-slow master clock signal produced without utilization of a crystal oscillator. The...
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5370665 |
Medical stimulator with multiple operational amplifier output stimulation circuits
A cardiac pacemaker or other tissue stimulator including first and second stimulation electrodes mounted adjacent to one another and adjacent the tissue to be stimulated, such as a chamber of a...
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5366488 |
Dual chamber pacemaker and method for operating same
In a dual chamber pacemaker capable of stimulating the atrium and ventricle in a heart, a stimulation pulse in the atrium could be sensed as a ventricular event which cannot be distinguished from a...
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5361776 |
Time domain reflectometer impedance sensor method of use and implantable cardiac stimulator using same
A time domain reflectometry (TDR) impedance sensor is provided for measuring body impedance along a lead or catheter implanted in a patient's cardiovascular system. The TDR sensor applies an...
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5357956 |
Apparatus and method for monitoring endocardial signal during ablation
An ablation catheter has an ablation electrode at a distal end coupled to an ablation power source through a low impedance coupling. The ablation electrode also functions as a sensing electrode,...
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5355894 |
Method for generating a signal corresponding to the respiration volume per unit of time of a patient
For generating a signal corresponding to the respiration volume per unit of time of a patient, a signal component correlated with the respiration is filtered out of a measured impedance signal...
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5342405 |
System and method for selecting a mode of operation of a dual-chamber pacemaker
A system and method for preventing atrial competition during sensor-driven operation of a dual-chamber pacemaker includes means for sensing atrial activity during an atrial refractory period....
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5342401 |
Real time cardiac arrhythmia stabilizing system
Electrical stimuli delivered to cardiac tissue at times determined from a chaos stabilizing algorithm, converts arrhythmia activity to periodic beating by an interbeat interval shortening action,...
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5340361 |
Implantable pacemaker having adaptive AV interval adoptively shortened to assure ventricular pacing
A dual-chamber implantable pacemaker configured to operate in the DDD or DDDR mode automatically adjusts its AV (or PV) interval to an amount just less than the natural conduction time of a...
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5336242 |
Band-pass filter for use in a sense amplifier of an implantable cardiac pacer
A low-power band-pass filter for use in a cardiac pacer includes a single operational amplifier connected in circuit relationship with a plurality of switched capacitors that function as bilinear...
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5334220 |
Dual-chamber implantable pacemaker having an adaptive AV interval that prevents ventricular fusion beats and method of operating same
A dual-chamber implantable pacemaker automatically adjusts its AV interval so that any ventricular stimulation pulses generated by the pacemaker at the conclusion of the pacemaker-defined AV...
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