System and method for discriminating high frequency electromagnetic interference from cardiac events
First Claim
1. An implantable device for detecting a physiologic event, the device comprising:
- an electromagnetic interference (EMI) detection module operable to receive an input signal characteristic of the physiologic event, the input signal including physiologic event components and EMI components, the EMI components including high frequency EMI components, and the EMI detection module being further operable to attenuate the physiologic event components and to pass the high frequency EMI components in an output signal; and
a signal conditioning module operable to generate a filtered signal from the input signal, the filtered signal having the high frequency EMI components removed; and
a mitigation module operable to use the high frequency EMI components in the output signal from the EMI detection module to remove the EMI components from the filtered signal.
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Abstract
A method for discriminating electromagnetic interference from a received signal in an implantable medical device includes identifying a frequency component in the input signal that corresponds to electromagnetic interference. The method further includes passing the physiologic frequency component through a bandpass filter, passing the electromagnetic frequency component through a high pass filter in parallel with the bandpass filter, detecting the electromagnetic frequency component from the high pass filter and using the detected EMI to mitigate one or more effects of the electromagnetic frequency component from the physiologic parameter signal passed by the bandpass filter. An implantable device for detecting a predetermined physiologic event includes an electromagnetic interference (EMI) detection module operable to receive a signal characteristic of a physiologic phenomenon, the received signal comprising a plurality of frequency components, the EMI detection module further operable to output a signal identifying frequency components associated with EMI that is included in the received signal; and a mitigation module operable to use the signal output from the EMI detection module to mitigate one or more effects of the frequency components associated with EMI from the received signal.
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Citations
13 Claims
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1. An implantable device for detecting a physiologic event, the device comprising:
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an electromagnetic interference (EMI) detection module operable to receive an input signal characteristic of the physiologic event, the input signal including physiologic event components and EMI components, the EMI components including high frequency EMI components, and the EMI detection module being further operable to attenuate the physiologic event components and to pass the high frequency EMI components in an output signal; and a signal conditioning module operable to generate a filtered signal from the input signal, the filtered signal having the high frequency EMI components removed; and a mitigation module operable to use the high frequency EMI components in the output signal from the EMI detection module to remove the EMI components from the filtered signal. - View Dependent Claims (2, 3, 4, 5)
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6. An implantable medical device for administering therapy in a body of a patient in response to detecting a physiologic event of interest, the device comprising:
a physiologic event detection module for receiving an input signal composed of a plurality of frequency components including physiologic event components and EMI components, the physiologic event detection module comprising; a bandpass filter for passing the frequency components that are between an upper cutoff frequency and a lower cutoff frequency; an electromagnetic interference (EMI) detection module for attenuating the physiologic event components and for passing high frequency components characteristic of the EMI components, wherein the high frequency components have a frequency of at least around 1 kHz; and a mitigation module for using the high frequency components characteristic of the EMI component from the EMI detection module to remove the EMI components from the frequency components passed by the bandpass filter, thereby enabling detection of the physiologic event. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
Specification