FAULT-TOLERANT SENSING IN AN IMPLANTABLE MEDICAL DEVICE
First Claim
1. A system comprising:
- a memory comprising a primary sensing vector and N alternate sensing vectors, wherein N is an integer that is greater than 1; and
a processing module configured to;
determine a ranking value for each of the N alternate sensing vectors, wherein each ranking value is indicative of the integrity of a cardiac electrical signal acquired via the corresponding alternate sensing vector;
sense cardiac events using the primary sensing vector;
detect a reduction in the integrity of a cardiac electrical signal acquired via the primary sensing vector;
select one of the N alternate sensing vectors in response to detecting a reduction in the integrity of the cardiac electrical signal acquired via the primary sensing vector, the selection based on the ranking value associated with the one of the N alternate sensing vectors; and
sense cardiac events using the selected one of the N alternate sensing vectors.
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Abstract
A system includes a memory and a processing module. The memory includes a primary sensing vector and N alternate sensing vectors. The processing module determines a ranking value for each of the N alternate sensing vectors. Each ranking value is indicative of the integrity of a cardiac electrical signal acquired via the corresponding alternate sensing vector. The processing module senses cardiac events using the primary sensing vector, detects a reduction in the integrity of a cardiac electrical signal acquired via the primary sensing vector, and selects one of the N alternate sensing vectors in response to detecting a reduction in the integrity of the cardiac electrical signal acquired via the primary sensing vector. The selection is based on the ranking value associated with the one of the N alternate sensing vectors. The processing module then senses cardiac events using the selected one of the N alternate sensing vectors.
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Citations
25 Claims
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1. A system comprising:
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a memory comprising a primary sensing vector and N alternate sensing vectors, wherein N is an integer that is greater than 1; and a processing module configured to; determine a ranking value for each of the N alternate sensing vectors, wherein each ranking value is indicative of the integrity of a cardiac electrical signal acquired via the corresponding alternate sensing vector; sense cardiac events using the primary sensing vector; detect a reduction in the integrity of a cardiac electrical signal acquired via the primary sensing vector; select one of the N alternate sensing vectors in response to detecting a reduction in the integrity of the cardiac electrical signal acquired via the primary sensing vector, the selection based on the ranking value associated with the one of the N alternate sensing vectors; and sense cardiac events using the selected one of the N alternate sensing vectors. - 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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storing a primary sensing vector and N alternate sensing vectors in a memory, wherein N is an integer that is greater than 1; determining a ranking value for each of the N alternate sensing vectors, wherein each ranking value is indicative of the integrity of a cardiac electrical signal acquired via the corresponding alternate sensing vector; sensing cardiac events using the primary sensing vector; detecting a reduction in the integrity of a cardiac electrical signal acquired via the primary sensing vector; selecting one of the N alternate sensing vectors in response to detecting a reduction in the integrity of the cardiac electrical signal acquired via the primary sensing vector, the selection based on the ranking value associated with the one of the N alternate sensing vectors; and sensing cardiac events using the selected one of the N alternate sensing vectors. - View Dependent Claims (13, 14, 15)
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16. A method comprising:
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sensing a plurality of ventricular events using a first ventricular sensing vector; detecting a plurality of arrhythmias based on analysis of the plurality of sensed ventricular events; determining whether to withhold therapy for each of the plurality of detected arrhythmias; determining a number of times that therapy was withheld for the plurality of detected arrhythmias; and determining when to switch from the first ventricular sensing vector to a second ventricular sensing vector based on the number of times therapy was withheld. - View Dependent Claims (17, 18, 19)
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20. A system comprising:
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a memory comprising a first ventricular sensing vector and a second ventricular sensing vector; and a processing module configured to; sense a plurality of ventricular events using the first ventricular sensing vector; detect a plurality of arrhythmias based on analysis of the plurality of sensed ventricular events; determine whether to withhold therapy for each of the plurality of detected arrhythmias; determine a number of times that therapy was withheld for the plurality of detected arrhythmias; and determine when to switch from the first ventricular sensing vector to the second ventricular sensing vector based on the number of times therapy was withheld.
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21. A system comprising:
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a memory comprising a primary pacing vector and N alternate pacing vectors, wherein N is an integer that is greater than 1; and a processing module configured to; determine a ranking value for each of the N alternate pacing vectors, wherein each ranking value is indicative of the integrity of the corresponding alternate pacing vector; pace one of the atria and the ventricles using the primary pacing vector; detect a reduction in the integrity of the primary pacing vector; select one of the N alternate pacing vectors in response to detecting a reduction in the integrity of the primary pacing vector, wherein the selection is based on the ranking value associated with the one of the N alternate pacing vectors; and pace the one of the atria and the ventricles using the selected one of the N alternate pacing vectors. - View Dependent Claims (22, 23, 24, 25)
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Specification