SENSING AND ATRIAL-SYNCHRONIZED VENTRICULAR PACING IN AN INTRACARDIAC PACEMAKER
First Claim
1. A method, comprising:
- producing a filtered cardiac electrical signal by filtering a raw cardiac electrical signal by an adjustable filter of a sensing module of a medical device configured to receive the raw cardiac electrical signal, the raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module;
determining if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal;
adjusting the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves;
determining P-wave sensing criteria based on the difference;
sensing a P-wave from the filtered cardiac electrical signal when the P-wave sensing criteria are met; and
setting a ventricular pacing escape interval in response to sensing the P-wave.
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Accused Products
Abstract
A pacemaker implantable in a chamber of a patient'"'"'s heart is configured to produce a filtered cardiac electrical signal by filtering a raw cardiac signal by an adjustable filter of a sensing module of the pacemaker. The sensing module is configured to receive the raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module. The pacemaker is further configured to determine if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal and adjust the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves.
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Citations
22 Claims
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1. A method, comprising:
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producing a filtered cardiac electrical signal by filtering a raw cardiac electrical signal by an adjustable filter of a sensing module of a medical device configured to receive the raw cardiac electrical signal, the raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module; determining if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal; adjusting the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves; determining P-wave sensing criteria based on the difference; sensing a P-wave from the filtered cardiac electrical signal when the P-wave sensing criteria are met; and setting a ventricular pacing escape interval in response to sensing the P-wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable medical device, comprising:
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a sensing module comprising an adjustable filter and configured to; receive a raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module; filter the raw cardiac electrical signal by the adjustable filter to produce a filtered cardiac electrical signal; determine if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal; adjust the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves; determine P-wave sensing criteria based on the difference; and sense a P-wave from the filtered cardiac electrical signal when the P-wave sensing criteria are met; a pulse generator configured to generate and deliver a ventricular pacing pulse via electrodes coupled to the pulse generator; and a control module coupled to the sensing module and the pulse generator and configured to set a ventricular pacing escape interval in response to the sensing module sensing the P-wave to control the pulse generator to deliver a ventricular pacing pulse when the ventricular pacing escape interval expires. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A non-transitory, computer-readable medium storing a set of instructions which, when executed by an implantable medical device cause the device to:
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produce a filtered cardiac electrical signal by filtering a raw cardiac electrical signal by an adjustable filter of a sensing module of the medical device configured to receive the raw cardiac electrical signal, the raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module; determine if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal; adjust the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves; determine P-wave sensing criteria based on the difference; sense a P-wave from the filtered cardiac electrical signal when the P-wave sensing criteria are met; and set a ventricular pacing escape interval in response to sensing the P-wave.
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Specification