Enhanced sensing by an implantable medical device in the presence of an interfering signal from an external source
First Claim
1. A method comprising:
- receiving an input associated with a presence of a magnetic resonance imaging (MRI) device that generates an interfering signal;
adjusting, in response to receiving the input, a sensing configuration of a sensing module of an implantable medical device to reduce a likelihood of clipping of sensed signals that include noise caused by the interfering signal, wherein adjusting the sensing configuration comprises at least one of increasing an amplitude input range of the sensing module and decreasing an amplitude gain of the sensing module; and
sensing signals using the adjusted sensing configuration while in the presence of the MRI device.
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Abstract
An implantable medical device (IMD) adjusts a sensing configuration of a sensing module prior to or immediately subsequent to entering an environment having an external source that generates the interfering signal. The IMD may, for example, adjust a sampling frequency, resolution, input range, gain, bandwidth, filtering parameters, or a combination of these or other sensing parameters of the sensing module. These adjustments enable the sensing module to obtain a more detailed representation of the sensed signals, including the noise components of the sensed signals caused by the interfering signal. Without having an adequate representation of the noise components of the sensed signal, it is difficult to separate the noise components of the sensed signal from the cardiac electrical signal.
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Citations
27 Claims
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1. A method comprising:
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receiving an input associated with a presence of a magnetic resonance imaging (MRI) device that generates an interfering signal; adjusting, in response to receiving the input, a sensing configuration of a sensing module of an implantable medical device to reduce a likelihood of clipping of sensed signals that include noise caused by the interfering signal, wherein adjusting the sensing configuration comprises at least one of increasing an amplitude input range of the sensing module and decreasing an amplitude gain of the sensing module; and sensing signals using the adjusted sensing configuration while in the presence of the MRI device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device comprising:
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a sensing module to sense electrical signals and having an amplitude input range; and a processor configured to receive an input associated with a presence of a magnetic resonance imaging (MRI) device that generates an interfering signal and adjust, in response to receiving the input, a sensing configuration of the sensing module by increasing the amplitude input range to reduce a likelihood of clipping of sensed signals that include noise caused by the interfering signal, wherein the sensing module senses signals using the adjusted sensing configuration while in the presence of the MRI device. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A non-transitory computer-readable medium comprising instructions that, when executed by a processor, cause the processor to:
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receive an input associated with a presence of a magnetic resonance imaging (MRI) device that generates an interfering signal; adjust, in response to receiving the input, a sensing configuration of a sensing module of an implantable medical device by decreasing a gain of the sensing module to reduce a likelihood of clipping of sensed signals that include noise caused by the interfering signal; and sense signals using the adjusted sensing configuration while in the presence of the MRI device. - View Dependent Claims (26, 27)
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Specification