Data logging system for implantable medical device
First Claim
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1. A data logging system, comprising:
- an implantable medical device having a constant current source connected to two electrodes adapted for internal disposition and contact with body fluids, the current source being driven by an oscillator for producing a current signal modulated with encoded data between the two electrodes to cause corresponding modulated potential signals detectable at a skin surface; and
,an external data logging device for affixation to a patient having incorporated therein a data communications interface for demodulating potential signals sensed at a skin surface location to extract encoded data therefrom, and circuitry for storing the encoded data in a data logging storage medium.
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Abstract
A data logging system and method in which an implantable medical device transmits logged data to an external data logging device with low energy potential signals. The implantable device generates potential signals modulated with digitally encoded data by operating a current source to cause corresponding electrical potentials that can be sensed at the skin surface by the external data logging device. The data logging device then demodulates the sensed potentials to derive the digital data and stores the data in a data logging storage medium.
150 Citations
18 Claims
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1. A data logging system, comprising:
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an implantable medical device having a constant current source connected to two electrodes adapted for internal disposition and contact with body fluids, the current source being driven by an oscillator for producing a current signal modulated with encoded data between the two electrodes to cause corresponding modulated potential signals detectable at a skin surface; and
,an external data logging device for affixation to a patient having incorporated therein a data communications interface for demodulating potential signals sensed at a skin surface location to extract encoded data therefrom, and circuitry for storing the encoded data in a data logging storage medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for data logging comprising:
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sensing cardiac electrical activity with an implanted cardiac device; encoding data reflective of the sensed cardiac activity; driving a constant current source connected to two internally disposed electrodes in contact with body fluids, the current source being driven by an oscillator for producing a current signal modulated with encoded data between the two electrodes to cause corresponding electrical potentials that can be sensed at a skin surface location; receiving and demodulating sensed potential signals at a skin surface location to derive the encoded data therefrom; and
,storing the derived encoded data in a data logging storage medium of an external data logging device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification