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Method and apparatus for synchronization of atrial defibrillation pulses

Inactive Publication Date: 2000-07-04
MEDTRONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is directed toward a method an apparatus for controlling the timing of delivery of atrial cardioversion or defibrillation pulses. In order to determine an appropriate time for delivery of a cardioversion pulse, an apparatus according to the present invention first determ...

Problems solved by technology

This is especially so if the devices do not include the capability of performing ventricular, as well as atrial defibrillation.

Method used

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  • Method and apparatus for synchronization of atrial defibrillation pulses
  • Method and apparatus for synchronization of atrial defibrillation pulses
  • Method and apparatus for synchronization of atrial defibrillation pulses

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Embodiment Construction

FIG. 1 is a cutaway view of the human heart in which a lead system suitable for use in practicing the present invention has been implanted. The lead system includes three leads. A right atrial lead 101 includes an elongated insulative lead body 102, to which a coiled defibrillation electrode 106 has been mounted. The distal end of the lead includes an electrode head 111, carrying a helical electrode 110 and a ring electrode 108. The electrodes 106, 108 and 110 are coupled to an implantable pacemaker / cardioverter / defibrillator 100 by means of conductors 116, 118 and 120. Electrodes 108 and 110 are employed for cardiac pacing and sensing in the atrium.

A coronary sinus lead 103 also has an elongated insulative lead body 104 which carries a coiled defibrillation electrode at its distal end, located as generally indicated in broken outline at 112. Electrode 112 is located within the coronary sinus and the great cardiac vein. Preferably the proximal end of the electrode 112 is spaced abou...

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Abstract

A method and apparatus for detecting and treating atrial fibrillation. In response to detecting atrial fibrillation, the device derives an escape interval based on one or more preceding intervals between ventricular depolarizations. The escape interval is initiated in response to a ventricular depolarization, and in response to the expiration of the escape interval, an atrial cardioversion pulse is delivered. In one embodiment of the invention, the cardioverting pulse is delivered immediately upon expiration of the derived escape interval. In a second embodiment of the invention, a ventricular pacing pulse is delivered on expiration of the escape interval, with an atrial cardioversion pulse following after a short delay.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to medical electrical stimulation generally, and more particularly to implantable atrial defibrillators.Recently, there has been a renewed interest in the development of implantable atrial cardioverters and defibrillators, as the more serious consequences of persistent atrial fibrillation have come to be understood. In such devices, it is desirable to synchronize delivery of the defibrillation pulse to the ventricle to avoid triggering arrhythmias in the ventricle. This is especially so if the devices do not include the capability of performing ventricular, as well as atrial defibrillation.A number of proposals have been set forth for controlling the timing of delivery of atrial cardioversion and defibrillation pulses. An early disclosure of an implantable atrial defibrillator, U.S. Pat. No. 3,952,750 issued to Mirowski et al., proposes simply synchronizing delivery of the atrial defibrillation pulse to a sensed R-wave. More r...

Claims

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Application Information

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IPC IPC(8): A61N1/39A61N1/362
CPCA61N1/3622A61N1/3956A61N1/395
Inventor MEHRA, RAHUL
Owner MEDTRONIC INC
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