Automatic determination and selection of filtering in a cardiac rhythm management device
First Claim
1. A cardiac rhythm management device comprising plural sensing electrodes for capturing a cardiac signal and operational circuitry coupled to the plural sensing electrodes for analyzing the cardiac signal, the operational circuitry configured with a selectable filtering mode allowing filtering of the captured cardiac signal according to a first approach and a second approach, the second approach applying an additional high pass filter relative to the first approach, wherein the operational circuitry is configured to operate using the selectable filtering mode as follows:
- determining whether to select the first approach or the second approach by measuring a first amplitude of the captured cardiac signal, post filtering via the first approach, and comparing the first amplitude to a first threshold and;
if the first amplitude exceeds the first threshold, enabling the second approach for use in cardiac signal analysis;
orif the first amplitude does not exceed the first threshold, disabling the second approach for use in cardiac signal analysis; and
detecting cardiac cycles by comparing a received cardiac signal, as filtered by one of the first or second approaches, to a detection threshold and declaring a new cardiac cycle when the received cardiac signal exceeds the detection threshold,wherein the first amplitude is a measure of the R-wave of one or more cardiac cycles.
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Accused Products
Abstract
Methods and/or device facilitating and selecting among multiple modes of filtering a cardiac electrical signal, in which one filtering mode includes additional high pass filtering of low frequency signals, relative to the other filtering mode. The selection filtering modes may include comparing sensed signal amplitude to one or more thresholds, using the multiple modes of filtering. In another example, an additional high pass filter is enabled, over and above a default or baseline filtering mode, and the detected cardiac signal is monitored for indications of possible undersensing, and/or for drops in amplitude toward a threshold, and the additional high pass filter may be disabled upon finding of possible undersensing or drop in signal amplitude.
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Citations
20 Claims
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1. A cardiac rhythm management device comprising plural sensing electrodes for capturing a cardiac signal and operational circuitry coupled to the plural sensing electrodes for analyzing the cardiac signal, the operational circuitry configured with a selectable filtering mode allowing filtering of the captured cardiac signal according to a first approach and a second approach, the second approach applying an additional high pass filter relative to the first approach, wherein the operational circuitry is configured to operate using the selectable filtering mode as follows:
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determining whether to select the first approach or the second approach by measuring a first amplitude of the captured cardiac signal, post filtering via the first approach, and comparing the first amplitude to a first threshold and; if the first amplitude exceeds the first threshold, enabling the second approach for use in cardiac signal analysis;
orif the first amplitude does not exceed the first threshold, disabling the second approach for use in cardiac signal analysis; and detecting cardiac cycles by comparing a received cardiac signal, as filtered by one of the first or second approaches, to a detection threshold and declaring a new cardiac cycle when the received cardiac signal exceeds the detection threshold, wherein the first amplitude is a measure of the R-wave of one or more cardiac cycles. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cardiac rhythm management device comprising plural sensing electrodes for capturing a cardiac signal and operational circuitry coupled to the plural sensing electrodes for analyzing the cardiac signal, the operational circuitry configured with a first filtering mode and a second filtering mode, the second filtering mode applying an additional high pass filter relative to the first filtering mode, wherein the operational circuitry is configured to select between the first and second filtering modes by:
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capturing data using each of the first filtering mode and the second filtering mode; analyzing the data captured with each of the first and second filtering modes; and determining which of the first filtering mode or second filtering mode yields more suitable sensing data by comparing at least one result of the analysis of the data using first filtering mode to at least one result of the analysis of the data using the second filtering mode; wherein the operational circuitry is further configured to use whichever of the first or second filtering mode yields more suitable sensing data to detected cardiac cycles in the cardiac signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operation in a cardiac rhythm management device comprising plural sensing electrodes for capturing a cardiac signal and operational circuitry coupled to the plural sensing electrodes for analyzing the cardiac signal, the operational circuitry configured with a selectable filtering mode allowing filtering of the captured cardiac signal according to a first approach and a second approach, the second approach applying an additional high pass filter relative to the first approach, the method comprising:
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determining whether to select the first approach or the second approach by measuring a first amplitude of the captured cardiac signal, as filtered using the first approach, and comparing the first amplitude to a first threshold and; if the first amplitude exceeds the first threshold, enabling the second approach for use in cardiac signal analysis;
orif the first amplitude does not exceed the first threshold, disabling the second approach for use in cardiac signal analysis; and detecting one or more cardiac cycles by comparing a received cardiac signal, as filtered by one of the first or second approaches, to a detection threshold and declaring a new cardiac cycle when the received cardiac signal exceeds the detection threshold, wherein the first amplitude is a measure of the R-wave of one or more cardiac cycles. - View Dependent Claims (17, 18, 19, 20)
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Specification