Implantable medical device telemetry with periodic frequency hopping
First Claim
1. A method for data transmission between an implantable medical device and an external system, the method comprising:
- producing channel selection commands each specifying a channel in a scan channel list when a scan timer escape interval expires, the scan channel list including channels selected from a plurality of channels each representing a predetermined frequency band;
performing a channel hopping in response to each of the channel selection commands, the channel hopping making the channel specified in the each of the channel selection commands an active channel;
performing data transmission between the implantable medical device and the external system using the active channel during a synchronous scan mode during which the channel hopping in the external system and the channel hopping in the implantable medical device are controlled to be synchronous;
starting an asynchronous scan mode in response to interruption of the data transmission resulting from making a predetermined number of attempts to transmit data using different channels in the scan channel list without success; and
restoring the synchronization of the channel hopping in the external system and the channel hopping in the implantable medical device during the asynchronous scan mode.
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Abstract
A far-field radio-frequency (RF) telemetry system for data transmission between an implantable medical device and an external system includes a plurality of channels each representing a frequency band within a predetermined frequency range. The data transmission is performed using at least one active channel at any instant. Channel hopping is performed on a periodic basis throughout a telemetry session such that the active channel keeps scanning through an array of channels selected from the plurality of channels. If a data frame is not successfully transmitted, it is repeatedly re-transmitted using the current and/or the next active channels until its transmission becomes successful.
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Citations
14 Claims
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1. A method for data transmission between an implantable medical device and an external system, the method comprising:
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producing channel selection commands each specifying a channel in a scan channel list when a scan timer escape interval expires, the scan channel list including channels selected from a plurality of channels each representing a predetermined frequency band; performing a channel hopping in response to each of the channel selection commands, the channel hopping making the channel specified in the each of the channel selection commands an active channel; performing data transmission between the implantable medical device and the external system using the active channel during a synchronous scan mode during which the channel hopping in the external system and the channel hopping in the implantable medical device are controlled to be synchronous; starting an asynchronous scan mode in response to interruption of the data transmission resulting from making a predetermined number of attempts to transmit data using different channels in the scan channel list without success; and restoring the synchronization of the channel hopping in the external system and the channel hopping in the implantable medical device during the asynchronous scan mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification