SENSING AND ATRIAL-SYNCHRONIZED VENTRICULAR PACING IN AN INTRACARDIAC PACEMAKER
First Claim
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1. A method performed by a medical device, comprising:
- filtering a raw cardiac electrical signal received by the medical device according to first filtering properties to produce a filtered cardiac electrical signal, the raw cardiac electrical signal comprising first cardiac events, second cardiac events different than the first cardiac events, and third cardiac events different than the first cardiac events and the second cardiac events;
detecting a first crossing of a first threshold by the filtered cardiac electrical signal;
identifying one of the second cardiac events after the first crossing;
detecting a second crossing of the first threshold by the filtered cardiac electrical signal after the identified one of the second cardiac events;
analyzing the first crossing and the second crossing of the filtered cardiac electrical signal;
establishing cardiac event sensing criteria that discriminate the first cardiac events from the third cardiac events based on the analyzing of the first crossing and the second crossing; and
sensing the first cardiac events from the filtered cardiac electrical signal when the established cardiac event sensing criteria are met.
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Abstract
An intracardiac pacemaker is configured to filter a raw cardiac electrical signal received by the pacemaker to produce a filtered cardiac electrical signal, analyzes the filtered cardiac electrical signal to establish cardiac event sensing criteria that discriminate P-waves from T-waves and R-waves all present in the raw cardiac electrical signal, and sense the P-waves from the filtered cardiac electrical signal when the established cardiac event sensing criteria are met. Sensed P-waves may be used for controlling atrial-synchronized ventricular pacing delivered by the pacemaker.
18 Citations
23 Claims
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1. A method performed by a medical device, comprising:
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filtering a raw cardiac electrical signal received by the medical device according to first filtering properties to produce a filtered cardiac electrical signal, the raw cardiac electrical signal comprising first cardiac events, second cardiac events different than the first cardiac events, and third cardiac events different than the first cardiac events and the second cardiac events; detecting a first crossing of a first threshold by the filtered cardiac electrical signal; identifying one of the second cardiac events after the first crossing; detecting a second crossing of the first threshold by the filtered cardiac electrical signal after the identified one of the second cardiac events; analyzing the first crossing and the second crossing of the filtered cardiac electrical signal; establishing cardiac event sensing criteria that discriminate the first cardiac events from the third cardiac events based on the analyzing of the first crossing and the second crossing; and sensing the first cardiac events from the filtered cardiac electrical signal when the established cardiac event sensing criteria are met. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device, comprising:
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a sensing module configured to receive a raw cardiac electrical signal via electrodes coupled to the sensing module, the raw cardiac electrical signal comprising first cardiac events, second cardiac events different than the first cardiac events, and third cardiac events different than the first cardiac events and the second cardiac events, the sensing module configured to; filter the raw cardiac electrical signal according to first filtering properties to produce a filtered cardiac electrical signal; detect a first crossing of a first threshold by the filtered cardiac electrical signal; identify one of the second cardiac events after the first crossing; detect a second crossing of the first threshold by the filtered cardiac electrical signal after the identified one of the second cardiac events; analyze the first crossing and the second crossing of the filtered cardiac electrical signal; establish cardiac event sensing criteria that discriminate the first cardiac events from the third cardiac events based on the analyzing of the first crossing and the second crossing; and sense the first cardiac events from the filtered cardiac electrical signal when the established cardiac event sensing criteria are met. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. 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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filter a raw cardiac electrical signal received by the medical device according to first filtering properties to produce a filtered cardiac electrical signal, the raw cardiac electrical signal comprising first cardiac events, second cardiac events different than the first cardiac events, and third cardiac events different than the first and second cardiac events; detect a first crossing of a first threshold by the filtered cardiac electrical signal; identify one of the second cardiac events after the first crossing; detect a second crossing of the first threshold by the filtered cardiac electrical signal after the identified one of the second cardiac events; analyze the first crossing and the second crossing of the filtered cardiac electrical signal; establish cardiac event sensing criteria that discriminate the first cardiac events from the third cardiac events based on the analyzing of the first crossing and the second crossing; and sense the first cardiac events from the filtered cardiac electrical signal when the established cardiac event sensing criteria are met.
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Specification