SENSING AND ATRIAL-SYNCHRONIZED VENTRICULAR PACING IN AN INTRACARDIAC PACEMAKER
First Claim
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1. A medical device system, comprising:
- an intracardiac pacemaker, the pacemaker comprising;
a sensing module configured to receive a cardiac electrical signal and detect a crossing of a first sensing threshold by the cardiac electrical signal;
a pulse generator configured to generate and deliver a pacing pulse to the patient'"'"'s heart via a pair of electrodes, anda control module coupled to the sensing module and the pulse generator and configured to;
set a pacing escape interval timer to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold,set a time limit in response to the cardiac electrical signal crossing the first sensing threshold, the time limit shorter than the first pacing escape interval;
adjust the pacing escape interval timer in response to the cardiac electrical signal crossing a second sensing threshold higher than the first sensing threshold within the time limit; and
control the pulse generator to deliver the pacing pulse if the first pacing escape interval expires.
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Abstract
An intracardiac pacemaker is configured to receive a cardiac electrical signal developed across a pair of electrodes coupled to the pacemaker and detect a crossing of a first sensing threshold of the cardiac electrical signal. A pacing escape interval timer is set to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold. The pacing escape interval timer is adjusted if the cardiac electrical signal crosses a second sensing threshold during a time limit.
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Citations
23 Claims
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1. A medical device system, comprising:
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an intracardiac pacemaker, the pacemaker comprising; a sensing module configured to receive a cardiac electrical signal and detect a crossing of a first sensing threshold by the cardiac electrical signal; a pulse generator configured to generate and deliver a pacing pulse to the patient'"'"'s heart via a pair of electrodes, and a control module coupled to the sensing module and the pulse generator and configured to; set a pacing escape interval timer to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold, set a time limit in response to the cardiac electrical signal crossing the first sensing threshold, the time limit shorter than the first pacing escape interval; adjust the pacing escape interval timer in response to the cardiac electrical signal crossing a second sensing threshold higher than the first sensing threshold within the time limit; and control the pulse generator to deliver the pacing pulse if the first pacing escape interval expires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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receiving a cardiac electrical signal by a sensing module of an intracardiac pacemaker; detecting a crossing of a first sensing threshold by the cardiac electrical signal; setting a pacing escape interval timer to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold, setting a time limit in response to the cardiac electrical signal crossing the first sensing threshold, the time limit shorter than the first pacing escape interval; adjusting the pacing escape interval timer in response to the cardiac electrical signal crossing a second sensing threshold higher than the first sensing threshold within the time limit; and delivering a pacing pulse to the patient'"'"'s heart if the first pacing escape interval expires. - 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 intracardiac pacemaker, cause the pacemaker to:
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receive a cardiac electrical signal via electrodes coupled to the pacemaker; detect a crossing of a first sensing threshold by the cardiac electrical signal; set a pacing escape interval timer to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold, set a time limit in response to the cardiac electrical signal crossing the first sensing threshold, the time limit shorter than the first pacing escape interval; adjust the pacing escape interval timer in response to the cardiac electrical signal crossing a second sensing threshold higher than the first sensing threshold within the time limit, wherein adjusting the pacing escape interval comprises one of cancelling the first pacing escape interval and extending the first pacing escape interval; and deliver a pacing pulse to the patient'"'"'s heart if the first pacing escape interval expires.
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Specification