Correlator based electromagnetic interference responsive control system useful in medical devices
First Claim
1. An implantable medical device, which comprises:
- a sensor for sensing a biomedical signal that may include an EMI component;
a detector for receiving an EMI signal and substantially excluding said biomedical signal; and
a correlator for receiving said biomedical signal and said EMI signal, said correlator producing a correlation function that is indicative of said EMI component.
1 Assignment
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Accused Products
Abstract
A system is provided to control operation of an implantable medical device based upon detected EMI (electromagnetic interference). A correlator produces a correlation function indicating the level of an EMI component of an input biomedical signal that includes a biomedical signal component and an EMI component, and that is monitored relative to a predetermined threshold to allow the device to operate in a normal manner as long as the intensity or level of the EMI component is such that it does not affect or interfere with device operation. One or more remedial measures may be selected in the event the level of the EMI component exceeds a predetermined threshold. The system is useful with any electronic device which receives an electronic information signal which may include an EMI component.
96 Citations
27 Claims
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1. An implantable medical device, which comprises:
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a sensor for sensing a biomedical signal that may include an EMI component; a detector for receiving an EMI signal and substantially excluding said biomedical signal; and a correlator for receiving said biomedical signal and said EMI signal, said correlator producing a correlation function that is indicative of said EMI component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device, which comprises:
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a correlator having a first input and a second input; said first input adapted for receiving a biomedical signal that may include an EMI component; said second input adapted for receiving a EMI signal and substantially excluding said biomedical signal; said correlator producing a correlation function that is indicative of said EMI component, whereby operation of the medical device is controllable in response to said correlation function; said correlation function being indicative of a level of said EMI component; a threshold detector operable in response to said correlation function for providing an output signal indicative of said EMI component exceeding a predetermined threshold; and means for controlling operation of said medical device in response to said threshold signal. - View Dependent Claims (14, 15)
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16. A medical device control method, which comprises the steps of:
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providing a correlator for receiving (a) a biomedical signal that may include an EMI component, and (b) an EMI signal; producing a correlation function via said correlator that is indicative of said EMI component; and controlling the operation of a medical device in response to said correlation function. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. In an electronic circuit which includes a sensor for electronically sensing at least one parameter, an EMI detection circuit comprising:
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a correlator having a first input and a second input, said first input adapted for receiving a signal from said sensor that may include an EMI component and said second input adapted for receiving a EMI signal and substantially excluding a signal of said at least one parameter; and said correlator producing a correlation function that is indicative of said EMI component. - View Dependent Claims (24, 25)
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26. An electronic circuit comprising:
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a sensor for receiving an information signal which may include an EMI component; a sensor for receiving an EMI signal and substantially excluding said information signal; and a correlator coupled to said sensors to receive said EMI signal and said information signal, said correlator producing a correlation function indicative of said EMI component in said information signal. - View Dependent Claims (27)
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Specification