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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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5480414 |
Method and apparatus for controlling pacemaker during automatic capture detection
A cardiac pacemaker improves battery longevity by automatically providing optimized threshold amplitude and pulse width values. During capture verification and threshold searching, the pacemaker...
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5476485 |
Automatic implantable pulse generator
The present invention is directed toward a pulse generator for detecting that a pulse generator and an implantable lead are properly implanted so that a plurality of automatic features can be...
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5476487 |
Autothreshold assessment in an implantable pacemaker
Capture is assessed in an implantable pacemaker by issuing a pair of stimulation pulses, separated by about 60-100 milliseconds. The second pulse of the stimulation pair is set to an energy level...
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5476486 |
Automatic atrial pacing pulse threshold determination utilizing an external programmer and a V-sense electrode
A clinical programming system is disclosed for use with an implanted cardiac pacemaker to automatically determine the minimum pacing energy which is necessary to evoke an atrial depolarization. The...
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5458623 |
Automatic atrial pacing threshold determination utilizing an external programmer and a surface electrogram
A clinical programming system for use with an implanted cardiac pacemaker to automatically determine the minimum pacing energy which is necessary to evoke an atrial depolarization. The system...
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5447525 |
Pacemaker which adapts to minimize current drain and provide desired capture safety margin
A cardiac pacemaker improves battery longevity by automatically providing a safe threshold and an associated pulse width leading to minimum current drain. The pacemaker stores a matrix of current...
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5443485 |
Apparatus and method for capture detection in a cardiac stimulator
A capture detection circuit for an implantable cardiac stimulator. A signal detected by an electrode in the heart following delivery of a stimulating pulse is amplified, bandpass and highpass...
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5431693 |
Method of verifying capture of the heart by a pacemaker
A method of verifying cardiac capture. A cardiac signal evoked in response to a cardiac stimulation pulse is sensed via an electrode. The sensed signal is lowpass filtered to remove noise and to...
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5431692 |
Method and apparatus for testing compatibility of lead polarity and polarity programming of a cardiac stimulator
A cardiac stimulation device includes a system for testing lead polarity and determining whether the programmed polarity configuration is compatible with an attached pacing and sensing lead. The...
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5425751 |
Method and apparatus for optimum positioning of a muscle stimulating implant
A method and apparatus for determining the optimum location for implanting a muscle stimulating electrode. A test probe is provided for producing an electric current at various muscle tissue...
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5423871 |
Method and device for monitoring electrodes of electrical heart stimulators
In a method for continuous, electrical monitoring of the electrodes of an electrical heart stimulator, having at least one stimulation electrode and an indifferent electrode, the inter-electrode...
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5417718 |
System for maintaining capture in an implantable pulse generator
An autocapture system within an implantable pulse generator automatically maintains the energy of a stimulation pulse at a level just above that which is needed to effectuate capture. The...
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5411533 |
Method and device for checking stimulation power in a pacemaker
During a calibration phase, the representative characteristics of a parameter are determined, a reference value is deduced for determining pacing efficiency, and during a threshold search phase,...
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5411529 |
Waveform discriminator for cardiac stimulation devices
An apparatus for producing signals indicative of power levels of depolarizations of heart tissue, particularly adapted for use in an implantable antiarrhythmia device or an implantable pacemaker....
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5405365 |
Implantable medical device having means for stimulating tissue contractions with adjustable stimulation intensity and a method for the operation of such a device
Implantable medical device comprising a device for stimulating tissue contractions with adjustable stimulation intensity, whereby the stimulation intensity is set such that a stimulated event is...
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5391192 |
Automatic ventricular pacing pulse threshold determination utilizing an external programmer and a surface electrocardiogram
A clinical programming system is disclosed for use with an implanted cardiac pacemaker to automatically determine the minimum pacing energy which is necessary to evoke a ventricular depolarization....
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5391191 |
Device for tissue stimulation
In a device for tissue stimulation, the stimulation energy is matched to the stimulation sensitivity of the tissue by altering the stimulation energy in steps upwardly until a tissue reaction is...
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5374282 |
Automatic sensitivity adjust for cardiac pacemakers
A pacemaker capable of automatically adjusting the sensitivity of its sense amplifier to electrical cardiac signals is disclosed. In one embodiment, a pacemaker having a pressure sensor disposed on...
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5370124 |
Cardiac assist device and method, including detection of heart events
Heart events are identified within an electrical signal derived from the heart by determining when the signals exceed a threshold which is matched to the signal height of the electrical signal...
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5350410 |
Autocapture system for implantable pulse generator
An autocapture system within an implantable pulse generator automatically maintains the energy of a stimulation pulse at a level just above that which is needed to effectuate capture. The...
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5331966 |
Subcutaneous multi-electrode sensing system, method and pacer
A method and apparatus for providing an enhanced capability of detecting and gathering electrical cardiac signals via an array of relatively closely spaced subcutaneous electrodes (located on the...
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5330512 |
Electrode charge-neutral sensing of evoked ECG
A cardiac pacemaker signal processing circuit adapted to obtain an evoked ECG signal. The circuit senses the electrical signals of the ring and tip electrodes in the unipolar mode from the bipolar...
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5324310 |
Cardiac pacemaker with auto-capture function
A pacemaker having two bipolar leads, one atrial, one ventricular, each with TIP and RING electrodes, configured as for conventional bipolar pacing/sensing in both chambers. Switching circuitry in...
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5320643 |
Automatic cardiac capture restoration and threshold-seeking method and apparatus
An automatic capture restoration and threshold-seeking method and apparatus for use with a cardiac pacemaker derives control signals for restoring cardiac capture from a cardiac pressure sensor....
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5312454 |
Apparatus and method of automatically adjusting a sensor signal comparator threshold for an oxygen sensing pacemaker
A monitoring system for an oxygen sensing, dual-wavelength, reflectance oximetry based, rate responsive cardiac pacemaker, is capable of automatically and continually adjusting an oxygen sensor...
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5282840 |
Multiple frequency impedance measurement system
A physiological monitoring system for monitoring the condition of a patient's body tissue. The device includes electrodes for contacting the tissue to be monitored, circuitry for generating...
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5265603 |
Electronic capture detection for a pacer
A pacemaker sense amplifier which includes active circuitry which establishes and attempts to maintain a constant field density between two electrodes, effectively clamping them together at...
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5233986 |
Time domain reflectometer-integrity testing system and method for medical device electrode
A device and method for testing the integrity of an electrode/wire, such as a pacemaker electrode, and electrical wires connected thereto has a receptacle for an electrode and includes a time...
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5201865 |
Medical lead impedance measurement system
A method and apparatus for measuring lead impedance during preselected test mode operation of an implantable body tissue stimulator. The analysis circuitry is periodically triggered into operation,...
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5137021 |
Lead current measurement circuit
An apparatus for and method of measuring the current which flows through a cardiac pacing lead to artificially stimulate contractions of the myocardium. This current measurement is useful for...
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5127402 |
System and method for maintaining stimulation pulse amplitude at battery depletion by self-regulating current drain usage
A system within an implantable stimulation device and a method for limiting the extent to which any high power consumption modes, such as a rate response mode, can be utilized during low battery...
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5076272 |
Autocontrollable pacemaker with alarm
An apparatus for administering electrotherapy, such as a pacemaker, having an alarm system including a relatively small alarm electrode affixed to the external surface of a non-conductive portion...
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5003975 |
Automatic electrode configuration of an implantable pacemaker
An implantable pacemaker having a unipolar/bipolar lead interchangeability includes lead impedance measuring capability for automatically measuring lead impedance, initiated by the occurrence of...
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4979507 |
Energy saving cardiac pacemaker
This invention has as an objective the universal matching of individual patient-pacemaker-implant electrode interface conditions to follow dynamic changes occurring in use, from pacemaker to...
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4969467 |
Pacemaker with improved automatic output regulation
A pacemaker which is provided with an improved automatic regulation circuit which is capable of distinguishing between a fashion beat and loss of capture. The failure to sense an evoked potential...
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4899750 |
Lead impedance scanning system for pacemakers
A pacemaker lead analyzer for measuring impedance during standard operation of an implanted pacemaker. The analyzer makes separate measurements of lead impedance during each heart signal and each...
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4895152 |
System for cardiac pacing
A system is provided for cardiac pacing, in which the output levels of the electrical stimulus pulses are responsive to the detection or non-detection of cardiac pacer evoked potentials. A pulse...
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4858610 |
Detection of cardiac evoked potentials
Automatic detection of cardiac pacer evoked potentials may be obtained through a cardiac pacer lead positioned in a heart chamber. An electrical stimulus is emitted in unipolar mode from a first...
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4817605 |
Pacemaker system and method for measuring and monitoring cardiac activity and for determining and maintaining capture
A system for determining P-wave or R-wave capture in response to pacemaker supplied electrical stimuli. One embodiment includes a conventional bipolar atrial lead having a tip electrode, connected...
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4766901 |
Rate responsive pacing system using the integrated evoked potential
A rate responsive cardiac pacing system is provided. In the illustrative embodiment, electrical stimulus pulses are applied to the heart ventricle and the evoked potential of the applied electrical...
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4763646 |
Heart pacemaker
A heart pacemaker for supplying pacing signals to a heart includes circuitry for controlling operation of the pacemaker in dependence upon the occurrence of heart sounds. The pacemaker includes a...
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4759366 |
Rate responsive pacing using the ventricular gradient
A rate responsive cardiac pacing system is provided. In the illustrative embodiment, electrical stimulus pulses are applied to the heart ventricle and the evoked potential of the applied electrical...
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4759367 |
Rate responsive pacing using the magnitude of the repolarization gradient of the ventricular gradient
A rate responsive cardiac pacing system is provided. In the illustrative embodiment, electrical stimulus pulses are applied to the heart ventricle and the evoked potential of the applied electrical...
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4729376 |
Cardiac pacer and method providing means for periodically determining capture threshold and adjusting pulse output level accordingly
A low-power cardiac pacer and method includes an automatic capture threshold determination system wherein the minimum pulse energy required to reliably stimulate contractions of a patient's heart...
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4708142 |
Automatic cardiac capture threshold determination system and method
An automatic capture threshold determination system and method apply pacing pulses to a patient's heart while simultaneously monitoring intracardiac electrical activity to detect evoked cardiac...
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4674508 |
Low-power consumption cardiac pacer based on automatic verification of evoked contractions
A low-power consumption implantable pacer includes a system for detecting evoked cardiac contractions in which pacing pulses are initially applied to a patient's heart in pairs such that at most...
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4674509 |
System and method for detecting evoked cardiac contractions
A system and method for detecting evoked cardiac contractions applies pacing pulses to a patient's heart while simultaneously monitoring intracardiac electrical activity to detect evoked cardiac...
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4585006 |
Cardiac pacer having stimulation threshold measurement circuit
An external pacer having a plurality of user-selectable output current levels includes a user-actuable push button switch for reducing the selected output current level by a factor of 10. By...
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4337776 |
Impedance measuring pacer
A pacer which facilitates the measurements of both electrode impedance and stimulation threshold. When activated by an external magnet, a sequence of reducing-amplitude stimulating pulses is...
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