Dynamic Sampling
First Claim
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1. A method of operating an implantable medical device, comprising:
- sensing a physiological parameter of a patient and producing a representative signal thereof, the physiological parameter including a periodically repeating physiological event;
sampling the sensed signal at a selected sampling frequency to produce digital samples representative of the sensed signal;
detecting the physiological events based on the digital samples;
determining an expected time period between the physiological events; and
setting the selected sampling frequency, the selected sampling frequency being increased ahead of an expected time of each physiological event based on the expected time period between physiological events, the selected sampling frequency being decreased following detection of each event.
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Abstract
Dynamic sampling of physiological parameters based on the next anticipated occurrence of a relatively periodic physiological event. Embodiments of the invention may be used to increase the battery life or effective data storage capacity of implantable medical devices while retaining or improving measurement resolution.
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Citations
20 Claims
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1. A method of operating an implantable medical device, comprising:
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sensing a physiological parameter of a patient and producing a representative signal thereof, the physiological parameter including a periodically repeating physiological event; sampling the sensed signal at a selected sampling frequency to produce digital samples representative of the sensed signal; detecting the physiological events based on the digital samples; determining an expected time period between the physiological events; and setting the selected sampling frequency, the selected sampling frequency being increased ahead of an expected time of each physiological event based on the expected time period between physiological events, the selected sampling frequency being decreased following detection of each event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device, comprising:
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an implantable sensor for sensing a physiological parameter of a patient and producing a representative signal thereof, the physiological parameter providing an indication of respiration; an analog-to-digital converter for producing digital samples representative of the sensor signal at a sampling frequency; and a processing means for detecting the indication of respiration based on the digital samples and for determining an expected time period between the indications of respiration, wherein said processor means sets and increases frequency being prior to an expected time of each indication of respiration. - View Dependent Claims (14, 15, 16, 17)
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18. A method of operating an implantable medical device, comprising:
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sensing a physiological parameter of a patient and producing a representative signal thereof, the physiological parameter including a periodically repeating physiological event; sampling the sensed signal at a selected sampling frequency to produce a plurality of digital samples representative of the sensed signal; determining an expected signal period of the sensor signal, the expected signal period being determined based on the amount of time between crossings of a threshold by the sensor signal, the expected signal period corresponding to the period between the periodically repeating physiological events; determining an expected time of each physiological event within each signal period; and setting the selected sampling frequency, the selected sampling frequency being increased ahead of an expected time of each physiological event, the selected sampling frequency being decreased following a detection of each event. - View Dependent Claims (19, 20)
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Specification