Implantable medical device with adaptive signal processing and artifact cancellation
First Claim
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1. A medical device, comprising:
- a light source configured to emit light at a plurality of wavelengths;
a detector configured to detect the emitted light and generate a corresponding detected light signal;
a signal conditioning module separating the detected light signal into a multi-dimensional signal, each of the dimensions of the multi-dimensional signal corresponding to scattered light received at a wavelength of the plurality of wavelengths;
a digital signal processor performing principal component analysis in response to the multi-dimensional signal to generate corresponding signal data;
a controller generating one of a therapy control signal and a diagnostic output signal in response to the signal data, wherein the controller detects a condition of a variable influencing the detector signal and initiates computation of a principal component by the digital signal processor in response to the detected condition, and wherein the controller detects a change in the condition of the variable and controls the digital signal processor to terminate computation of the principal component and store a currently computed principal component as the principal component corresponding to the detected variable condition in response to detecting the change in the condition; and
a memory, wherein the digital signal processor stores in the memory the principal component of the multi-dimensional signal computed by performing the principal component analysis, the principal component corresponding to the detected variable condition.
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Abstract
A medical device includes one or more sensors used to acquire a multi-dimensional signal. In one embodiment, principal component analysis is performed on the multi-dimensional signal to produce signal data. The principal component analysis results are used to cancel signal artifact in one embodiment. A medical device controller produces one of a therapy control and a diagnostic output in response to the signal data.
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Citations
19 Claims
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1. A medical device, comprising:
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a light source configured to emit light at a plurality of wavelengths; a detector configured to detect the emitted light and generate a corresponding detected light signal; a signal conditioning module separating the detected light signal into a multi-dimensional signal, each of the dimensions of the multi-dimensional signal corresponding to scattered light received at a wavelength of the plurality of wavelengths; a digital signal processor performing principal component analysis in response to the multi-dimensional signal to generate corresponding signal data; a controller generating one of a therapy control signal and a diagnostic output signal in response to the signal data, wherein the controller detects a condition of a variable influencing the detector signal and initiates computation of a principal component by the digital signal processor in response to the detected condition, and wherein the controller detects a change in the condition of the variable and controls the digital signal processor to terminate computation of the principal component and store a currently computed principal component as the principal component corresponding to the detected variable condition in response to detecting the change in the condition; and a memory, wherein the digital signal processor stores in the memory the principal component of the multi-dimensional signal computed by performing the principal component analysis, the principal component corresponding to the detected variable condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of generating a signal in a medical device, comprising:
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emitting light at a plurality of wavelengths; detecting the emitted light and generating a corresponding detected light signal; separating the detected light signal into a multi-dimensional signal, each of the dimensions of the multi-dimensional signal corresponding to scattered light received at a wavelength of the plurality of wavelengths; performing principal component analysis in response to the multi-dimensional signal to generate corresponding signal data; generating one of a therapy control signal and a diagnostic output signal in response to the signal data; detecting a condition of a variable influencing the detected light; initiating computation of the principal component of the multi-dimensional signal data in response to detecting the variable condition; storing the principal component of the multi-dimensional signal, the principal component corresponding to the detected variable condition; detecting a change in the condition of the variable; terminating computation of the principal component in response to detecting the change; and storing a currently computed principal component as the principal component corresponding to the detected variable condition in response to detecting the change in the condition. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable medium having computer executable instructions for performing a method comprising:
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emitting light at a plurality of wavelengths; detecting the emitted light and generating a corresponding detected light signal; separating the detected light signal into a multi-dimensional signal, each of the dimensions of the multi-dimensional signal corresponding to scattered light received at a wavelength of the plurality of wavelengths; performing principal component analysis in response to the multi-dimensional signal to generate corresponding signal data; generating one of a therapy control signal and a diagnostic output signal in response to the signal data; detecting a condition of a variable influencing the detected light; initiating computation of the principal component of the multi-dimensional signal data in response to detecting the variable condition; storing the principal component of the multi-dimensional signal, the principal component corresponding to the detected variable condition; detecting a change in the condition of the variable; terminating computation of the principal component in response to detecting the change; and storing a currently computed principal component as the principal component corresponding to the detected variable condition in response to detecting the change in the condition. - View Dependent Claims (16)
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17. A medical device, comprising:
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a light source configured to emit light at a plurality of wavelengths; a detector configured to detect the emitted light and generate a corresponding detected light signal; a signal conditioning module separating the detected light signal into a multi-dimensional signal, each of the dimensions of the multi-dimensional signal corresponding to scattered light received at a wavelength of the plurality of wavelengths; a digital signal processor performing principal component analysis in response to the multi-dimensional signal to generate corresponding signal data; a controller generating one of a therapy control signal and a diagnostic output signal in response to the signal data, wherein the controller detects a condition of a variable influencing the detector signal and initiates computation of a principal component corresponding to the detected variable condition by the digital signal processor in response to the detected condition, and wherein the controller detects a change in the condition of the variable and controls the digital signal processor to terminate computation of the principal component in response to detecting the change in the condition. - View Dependent Claims (18, 19)
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Specification