Implantable cardiac stimulator with rate-adaptive T-wave detection
First Claim
1. An implantable device for providing pacing and defibrillating stimuli to a heart, comprising:
- a power source;
at least one electrode electrically connected to said power source;
a sensor capable of providing data that can be used to determine a physiological pacing demand; and
a control device, said control device controlling the application of electrical stimuli through said electrode, said control device calculating a physiological pacing demand based on said data, calculating an adjusted pacing interval based on said demand, calculating an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of said pacing interval, and calculating the end time of a T-wave monitoring window, said end time being a function of said pacing interval and being less than said VPRPcurrent.
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Accused Products
Abstract
An implantable device for providing pacing and defibrillating stimuli to a heart, comprises: a power source, at least one electrode electrically connected to said power source, a sensor capable of providing data that can be used to determine a physiological pacing demand, and a control device. The control device controls the application of electrical stimuli to the heart. The control device calculates an adjusted pacing interval based on said demand, calculates an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of said pacing interval, and calculates a T-wave monitoring window. The end time, and optionally the start time also, of the T-wave window is a function of the pacing interval. The control device is also capable of adjusting the sensitivity of an amplifier based on signals received during the T-wave window.
143 Citations
23 Claims
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1. An implantable device for providing pacing and defibrillating stimuli to a heart, comprising:
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a power source; at least one electrode electrically connected to said power source; a sensor capable of providing data that can be used to determine a physiological pacing demand; and a control device, said control device controlling the application of electrical stimuli through said electrode, said control device calculating a physiological pacing demand based on said data, calculating an adjusted pacing interval based on said demand, calculating an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of said pacing interval, and calculating the end time of a T-wave monitoring window, said end time being a function of said pacing interval and being less than said VPRPcurrent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for monitoring a heart, comprising:
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(a) sensing data that can be used to determine a pacing demand; (b) calculating an adjusted pacing interval based on the demand; (c) calculating an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of the pacing interval; (d) calculating the end time of a T-wave monitoring window, the end time being a function of the pacing interval and being less than the VPRPcurrent ; (e) providing the start time of the T-wave window; and (f) monitoring electrical signals emitted by the heart during the period between the start time and the end time of the T-wave window. - View Dependent Claims (10, 11, 12, 13, 14)
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- 15. A control device for an implantable cardioverter/defibrillator that is also capable of providing pacing stimuli to a heart at a demand-responsive adjusted pacing interval, said control device controlling the application of electrical stimuli to the heart, said control device calculating the adjusted pacing interval of the rate-responsive pacing, calculating an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of said adjusted pacing interval, and calculating the end time of a T-wave monitoring window, said end time being a function of said adjusted pacing interval and being less than said VPRPcurrent.
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23. An implantable device for providing pacing and defibrillating stimuli to a heart, comprising:
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a power source; at least one electrode electrically connected to said power source; a sensor capable of providing data that can be used to determine a physiological pacing demand; and a control device, said control device controlling the application of electrical stimuli through said electrode, said control device calculating a physiological pacing demand based on said data, calculating an adjusted pacing interval based on said demand, calculating an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of said pacing interval, and calculating the end time of a T-wave monitoring window, said end time being a function of said pacing interval and being less than said VPRPcurrent.
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Specification