Control of an active implantable medical device
First Claim
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1. Process of control of an implantable active medical device comprising:
- measuring a representative magnitude of a physiological parameter;
providing an enslavement function to enslave the operation of the implantable active medical device to the measured physiological parameter;
measuring a representative magnitude of a noise signal and determining a value of the noise;
comparing the value of the noise to a threshold; and
when the value of the noise exceeds the threshold, considering a possible suspension of the enslavement function in response thereto.
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Abstract
Process of control of an implantable active medical device. The device is under the responsive control of (enslavement to) a sensed physiological parameter. A representative magnitude of the physiological parameter is measured in the presence of a useful signal to determine a value of the parameter. Then, in the absence of the useful signal, another measure is made to determine the noise. The noise is compared to a threshold corresponding to an unacceptable level of noise. In case of crossing the noise threshold, this crossing is taken in account by a control device with a view to possible suspension of a function of the device if there is too much noise.
138 Citations
45 Claims
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1. Process of control of an implantable active medical device comprising:
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measuring a representative magnitude of a physiological parameter; providing an enslavement function to enslave the operation of the implantable active medical device to the measured physiological parameter; measuring a representative magnitude of a noise signal and determining a value of the noise; comparing the value of the noise to a threshold; and when the value of the noise exceeds the threshold, considering a possible suspension of the enslavement function in response thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. An implantable active medical device comprising an electronic circuit for measuring a representative magnitude of a physiological parameter, and a control device to insure an operation of the implantable active medical device as a function of the measured physiological parameter, wherein the electronic circuit further comprises an amplifier having a feedback signal input, an input corresponding to said measured magnitude, and an output, an analog-to-digital converter converting the amplifier output to a digital value, an integrator to integrate the digital values, and a digital-to-analog converter to convert the integrated values to said feedback signal.
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11. A method of controlling the operation of an implantable active medical device comprising the steps of:
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a) sensing a first signal in response to a presence of a useful signal; b) controlling the operation of the device in a first operating mode as a function of said first signal; c) sensing a second signal in an absence of the useful signal; d) determining whether or not the second signal corresponds to noise; and e) considering whether or not to suspend operation in the first operating mode in response to determining that the second signal corresponds to noise. - View Dependent Claims (12, 13, 14, 15)
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16. A method of controlling an operation of an implantable active cardiac control device comprising the steps of:
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a) sensing a first signal amplitude corresponding to a presence of a useful signal and representative of a physiological parameter; b) operating said device in a first operating mode as a function of said sensed first signal amplitude; c) sensing a second signal amplitude corresponding to an absence of said useful signal and representative of noise; d) determining whether or not the sensed second signal amplitude corresponds to an unacceptable level of noise; and e) considering whether or not to suspend operation in the first operating mode in response to determining that the second signal corresponds to an unacceptable level of noise. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. Apparatus for controlling operation of an implantable active cardiac control device comprising:
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a first electronic measuring circuit sensing a first signal amplitude corresponding to a presence of a useful signal and representative of a physiological parameter; a data processor operating said device in one of a first operating mode performing cardiac control as a function of the sensed first signal amplitude, and a second operating mode performing cardiac control other than as a function of the sensed first signal amplitude; a second electronic measuring circuit sensing a second signal amplitude during an absence of said useful signal and corresponding to a suspected noise signal; and means for determining whether or not the sensed second signal corresponds to an unacceptable level of noise; wherein said data processor further comprises operating means for considering whether or not to suspend operation of said device in the first operating mode in response to determining that the sensed second signal corresponds to an unacceptable level of noise. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification