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7613514 |
Selective resynchronization therapy optimization based on user preference
A method and system for calculating an atrio-ventricular delay interval based upon an inter-atrial delay exhibited by a patient's heart. The aforementioned atrio-ventricular delay interval may...
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7580746 |
Implantable medical device for generating cardiac pressure-volume loop and optimizing therapy
An implantable medical device for generating a cardiac pressure-volume loop, the implantable medical device comprising a pulse generator including control circuitry, a first cardiac lead including...
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7392084 |
Demand-based cardiac function therapy
A method and device for delivering cardiac function therapy on a demand basis. An implantable device for delivering cardiac function therapy is programmed to suspend such therapy at periodic...
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7363077 |
Adaptive timing interval control method for treating congestive heart failure
A method of treating a heart with an implantable cardiac stimulation device involves transiently disturbing the steady state hemodynamic parameters by altering a cardiac cycle timing interval...
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7305266 |
Cardiac stimulation devices and methods for measuring impedances associated with the heart
An exemplary method includes introducing current between a first pair of electrodes configured for placement internally in a patient, triggering a potential measurement between a second pair of...
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7277761 |
Vagal stimulation for improving cardiac function in heart failure or CHF patients
Exemplary methods for decreasing workload, maintaining or increasing cardiac output and/or achieving a desirable autonomic balance by stimulating one or more parasympathetic nerves. Various...
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7225022 |
Method of optimizing patient outcome from cardiac resynchronization therapy
A method of data management for optimizing the patient outcome from the provision of cardiac resynchronization therapy (CRT) is described. This method describes a process by which sets of dynamic...
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7212862 |
Cardiac stimulation device including sleep apnea prevention and treatment
An implantable cardiac stimulation device comprises a physiologic sensor and one or more pulse generators. The physiologic sensor is capable of sensing a physiologic parameter. The pulse generators...
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7158830 |
Method and apparatus for optimizing stroke volume during DDD resynchronization therapy using adjustable atrio-ventricular delays
A pacing system for providing optimal hemodynamic cardiac function for parameters such as ventricular synchorny or contractility (peak left ventricle pressure change during systole or LV+dp/dt), or...
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7139609 |
System and method for monitoring cardiac function via cardiac sounds using an implantable cardiac stimulation device
Techniques are provided for performing internal measurement of heart sounds to estimate patient cardiac function in terms of stroke volume, cardiac output, or a maximum rate of change of aortic...
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7130687 |
Implantable medical device and method for delivering therapy for sleep-disordered breathing
An implantable medical device delivers augmentation therapy to intervene in a pattern of sleep-disordered breathing. Augmentation therapy includes the delivery of electrical stimulation to cardiac...
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7130684 |
Method and apparatus for improving ventricular status using the force interval relationship
Methods and devices for improving ventricular contractile status of a patient suitably exploit changes in ventricular pressure and/or dP/dt max to provide and/or optimize a response to a patient....
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7092757 |
Minute ventilation sensor with dynamically adjusted excitation current
A minute ventilation sensing device in which transthoracic impedance is measured with a excitation current waveform at a specified amplitude and frequency. In order reduce interference with the...
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7024244 |
Estimation of stroke volume cardiac output using an intracardiac pressure sensor
Techniques are described for estimating a rate of blood flow from a heart, such as a stroke volume or a cardiac output, as a function of a pressure in the heart. A pressure monitor may measure...
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6975903 |
Rate adaptive pacemaker using impedance measurements and stroke volume calculations
A rate adaptive pacemaker comprises a means ( 2 ) for determining the demand of the patient's organism, a pacing rate controlling means ( 16 ) for controlling the pacing rate in response to the...
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6892095 |
Method and apparatus for monitoring left ventricular work or power
A body implantable system employs a lead system having at least one electrode and at least one thermal sensor at a distal end. The lead system is implanted within a patient's heart in a coronary...
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6885892 |
Rate adaptive pacemaker
A rate adaptive pacemaker has a measuring unit which interacts with a patient to determine a demand, a pacing rate controller connected to the measuring unit for controlling the pacing rate in...
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6859662 |
Method and device for the diagnosis and therapy of chronic heart failure
Method and device for the diagnosis and therapy of chronic heart failure comprising continuous monitoring of the patient and continuous determination of significant decompensation parameters during...
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6597951 |
Automatic selection from multiple cardiac optimization protocols
A method and system for setting the operating parameters of a cardiac rhythm management device in which a plurality of parameter optimization algorithms are available. A measured feature of an...
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6547737 |
Intelligent transcranial doppler probe
A system for automatic manipulation of a transcranial Doppler probe device designed for placement on a patient's head comprising a bi-temporal probe hanger, a cylindrical probe housing having an...
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6496732 |
Internal cardiac output monitor
Determining the cardiac output of a patient uses first and second electrodes disposed with the peri-aortic adventitia or fat pad of the patient. Third electrode is disposed on the cardiac atrial...
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6468219 |
Implantable telemetric transcranial doppler device
The invention relates to a cerebral blood flow velocity monitoring system and method that comprises a transcranial Doppler ultrasound device that is adapted to be implanted in the human body, an...
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6453192 |
Detection of ventricular ectopic beats using ventricular electrogram
A method of accurately determining if ectopic beats are occurring in the heart by detecting the time interval, T, between a point Q* defined is the onset of the QRS complex and the peak value of R...
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6314323 |
Heart stimulator determining cardiac output, by measuring the systolic pressure, for controlling the stimulation
A heart stimulator has a circuit for determining cardiac output and for producing a control signal corresponding to the determined cardiac output, and a controller for controlling cardiac...
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6314322 |
System and method for treating dilated cardiomyopathy using end diastolic volume (EDV) sensing
A system for controlling end diastolic volume of the heart is disclosed. The system includes an EDV sensor constructed and arranged to measure a parameter related to the end diastolic volume of the...
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6134472 |
Heart stimulation device
In the determination of an optimal rate for the delivery of stimulation pulses to a heart, the stroke volume (SV) of a heart ventricle is measured as a function of heart rate (HR), e.g. by...
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5707398 |
Automatic determination of optimum electrode configuration for a cardiac stimulator
In an implantable pacemaker or cardioversion/defibrillation device, the optimal electrodes for determining a pacing parameter are found. A test signal is sequentially switched and a response from...
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5690689 |
Dual-chamber implantable stimulation device having adaptive AV intervall and method for treating cardiomyopathy thereof
A dual-chamber implantable pacemaker configured to operate in the DDD or DDDR mode automatically sets its AV (or PV) interval to an amount that is equal to the natural conduction time of a patient...
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5643327 |
Pacemaker and method having optimized A-V delay by using the evoked depolarization potential as an indicia of cardiac output
The cardiac output of a paced heart is optimized by measuring a parameter indicative of the volume of blood in a heart chamber as a function of a pacing parameter. The pacing parameter is adjusted...
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5626624 |
Arrangement for controlling a pacemaker
An arrangement is provided for controlling a stimulation frequency of a pacemaker. The arrangement includes an atrial bipolar electrode system and a ventricular bipolar electrode system. A first...
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5507785 |
Rate responsive cardiac pacemaker with biphasic impedance sensing and method
An implantable, rate responsive pacemaker, sensitive to impedance changes in the heart as an indicator of cardiac stroke volume or minute volume, wherein common interfering signals such as the...
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5500006 |
Arrangement, particularly a heart pacemarker, for acquiring a measurement parameter of the heart activity
An arrangement, in particular a heart pacemaker, has a measuring device for recording a heart activity measurement parameter. In order to record the measurement parameter in such a way that it is...
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5417717 |
Implantable cardiac function monitor and stimulator for diagnosis and therapy delivery
An implantable monitor/stimulator is disclosed that monitors and assesses indices of cardiac function, including the strength and timing of cardiac contraction, then automatically executes a...
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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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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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5314449 |
Rate-adaptive cardiac pacemaker
A cardiac pacemaker, whose stimulation rate is controlled dependent on an impedance signal acquired between two electrodes, has one of the two electrodes disposed in an atrial electrode catheter...
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5306293 |
Device for the prevention of cardiac failures
The implantable device, of the Holter intervention type, permits the detection and the polygraphic analysis (ECG, TA, haemodynamics, resonant frequencies), of the cardiovascular parameters,...
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5284136 |
Dual indifferent electrode pacemaker
An endocardial lead having first and second spaced apart electrodes resides in a patient's heart. The first electrode is a sensing electrode and the second electrode is a carrier signal driving...
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5190035 |
Biomedical method and apparatus for controlling the administration of therapy to a patient in response to changes in physiological demand
A biomedical apparatus capable of sensing changes in the heart's ventricular volume or stroke volume and then changing the operating performance of the device in a fashion as a function of stroke...
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5188106 |
Method and apparatus for chronically monitoring the hemodynamic state of a patient using doppler ultrasound
A hemodynamic control apparatus and method for regulating blood flow within the cardiovascular system in a closed-loop control system using ultrasound measurement techniques to determine a...
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5156147 |
Variable rate pacemaker having upper rate limit governor based on hemodynamic performance
A rate adaptive pacemaker of the type having a variable rate cardiac stimulating pulse generator and a sensor for monitoring some physiologic parameter whereby the pulse generator stimulating rate...
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5154171 |
Rate adaptive pacemaker controlled by ejection fraction
A rate adaptive pacer designed to accommodate changes in a patient's metabolic demand utilizes ventricular ejection fraction (EF) as the rate controlling parameter. Ejection fraction is measured by...
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5139020 |
Method and apparatus for controlling the hemodynamic state of a patient based on systolic time interval measurements detecting using doppler ultrasound techniques
A hemodynamic control apparatus and method for regulating blood flow within the cardiovascular system in a closed-loop control system using ultrasound measurement techniques and intracardiac...
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5101824 |
Rate-responsive pacemaker with circuitry for processing multiple sensor inputs
An implantable rate-responsive pacemaker is disclosed wherein two or more sensors indicative of physiological demand are utilized in a fashion designed to realize the advantages of both sensors in...
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5058583 |
Multiple monopolar system and method of measuring stroke volume of the heart
A multiple monopolar system and method for measuring stroke volume of a patient's heart. An intracardiac impedance catheter is provided with a plurality of monopolar electrodes axially spaced along...
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5036849 |
Variable rate cardiac pacer
An endocardial lead having first and second spaced apart electrodes resides in a patient's heart. The first electrode is a sensing electrode and the second electrode is a carrier signal driving...
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5003976 |
Cardiac and pulmonary physiological analysis via intracardiac measurements with a single sensor
Physiological activity of a patient is detected and analyzed by means of a single sensor situated in the vascular system of the patient. Pulmonary activity is derived from analysis of changes in...
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4884576 |
Self adjusting rate responsive cardiac pacemaker and method
It has been found from studies of healthy persons and patient's wearing pacemakers that the basic cardiovascular condition and the heart rate response to exercise varies considerably between...
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4870968 |
System and method for controlling the stimulation frequency of heart pacemakers
A follower control matches the stimulation frequency of a heart pacemaker to patient load condition by obtaining measurement values S 02 corresponding to the central venous blood oxygen saturation...
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4803987 |
Temperature responsive controller for cardiac pacer
A controller for variably controlling the pacing rate of a cardiac pacer responsive to temperature which includes a logic and control unit, a parameter communication unit, an analog to digital...
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