Dual chamber pacer with alternative rate adaptive means and method
First Claim
1. A dual chamber pacemaker, having means for sensing atrial heartbeat signals and means for sensing ventricular heartbeat signals, and means for delivering stimulus pulses at least to the ventricle, comprising:
- atrial rate means for determining the rate of said sensed atrial signals,QT means for sensing the ventricular QT interval and for determining an indicated pacing rate therefrom, comparison means for making a comparison of said indicated rate with the rate of sensed atrial heartbeat signals, andcontrol means for controlling the timing of said pacemaker as a function of said indicated rate or as a function of sensed atrial signals depending upon said comparison.
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Accused Products
Abstract
A dual chamber pacemaker system is disclosed with means for operating in one or another of alternate rate adaptive modes. The pacemaker incorporates an atrial synchronous mode, wherein, pacing rate is determined as a function of sensed atrial signals. It also incorporates a Tx mode, wherein pacing rate is controlled by a sensed QT interval, and an extra sensor mode, wherein pacing rate is controlled as a function of at least one sensed body parameter. The pacemaker comprises means for automatically testing the applicability or appropriateness of the mode currently in use, and for automatically selecting the appropriate rate control mode.
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Citations
21 Claims
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1. A dual chamber pacemaker, having means for sensing atrial heartbeat signals and means for sensing ventricular heartbeat signals, and means for delivering stimulus pulses at least to the ventricle, comprising:
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atrial rate means for determining the rate of said sensed atrial signals, QT means for sensing the ventricular QT interval and for determining an indicated pacing rate therefrom, comparison means for making a comparison of said indicated rate with the rate of sensed atrial heartbeat signals, and control means for controlling the timing of said pacemaker as a function of said indicated rate or as a function of sensed atrial signals depending upon said comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. Dual chamber pacemaker apparatus having synchronous means for operating in a synchronous mode of operation, said synchronous means including atrial sensing means for sensing atrial signals and atrial control means for controlling the ventricular pacing rate in an atrial rate control mode, and alternate means for operating in at least one alternate ventricular rate control mode, logic means for performing logical tests on said atrial signals and for deciding whether to maintain said atrial rate control mode as a function of said logical tests, and rate mode means for controlling the pacemaker rate control mode as a function of said logical decision.
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16. Dual chamber pacemaker apparatus with means for pacing and sensing in both the atrium and the ventricle, comprising
atrial rate control means for controlling pacing rate as a function of sensed atrial signals, alternate rate control means for alternate controlling of said pacing rate, said alternate rate control means having information means for determining patient information and for determining an alternate heartbeat rate as a function of said patient information, tracking means for tracking said pacing rate, logic means for comparing said atrial controlled rate with said alternate heartbeat rate and for determining when the pacing rate is to be atrial controlled and when alternate controlled, and rate control means for switching rate control from one of said atrial control and said alternate control to the other, and for effecting gradual change of said pacing rate from said tracked rate to the controlled rate following switching of rate control.
Specification