Downlink telemetry system and method for implantable medical device
First Claim
1. An implantable medical device telemetry method for downlink transmission of telemetry signals between a transmitter of an external communication device and a receiver of an implantable medical device, the method comprising the steps of:
- providing one or more downlink control bursts from the transmitter, wherein each downlink control burst is defined by a ramped envelope having a burst duration and a peak amplitude;
detecting one or more of the downlink control bursts received at the receiver of the implanted medical device from the transmitter and generating a downlink strength signal representative of the strength of the one or more downlink control bursts;
providing a plurality of downlink data bursts from the transmitter, wherein the plurality of downlink data bursts are modulated with data, and further wherein each downlink data burst is defined by a ramped envelope having a burst duration and a peak amplitude; and
controlling the peak amplitude of the plurality of downlink data bursts by adjusting the burst duration of the ramped envelope as a function of the downlink strength signal.
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Abstract
Downlink telemetry for an implantable medical device includes controlling downlink energy by generating a downlink strength signal representative of the strength of one or more downlink control bursts transmitted from an external communication device and received at the receiver of the implantable medical device. The peak amplitude of modulated downlink data bursts is controlled by adjusting the burst duration of the ramped envelope of such downlink data bursts as a function of the downlink strength signal.
195 Citations
46 Claims
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1. An implantable medical device telemetry method for downlink transmission of telemetry signals between a transmitter of an external communication device and a receiver of an implantable medical device, the method comprising the steps of:
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providing one or more downlink control bursts from the transmitter, wherein each downlink control burst is defined by a ramped envelope having a burst duration and a peak amplitude; detecting one or more of the downlink control bursts received at the receiver of the implanted medical device from the transmitter and generating a downlink strength signal representative of the strength of the one or more downlink control bursts; providing a plurality of downlink data bursts from the transmitter, wherein the plurality of downlink data bursts are modulated with data, and further wherein each downlink data burst is defined by a ramped envelope having a burst duration and a peak amplitude; and controlling the peak amplitude of the plurality of downlink data bursts by adjusting the burst duration of the ramped envelope as a function of the downlink strength signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling downlink energy of telemetry signals transmitted from a transmitter of an external communication device to a receiver of an implantable medical device, the method comprising the steps of:
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initiating a handshake by providing a handshake request from a transmitter of the implantable medical device; receiving the handshake request at a receiver of the external communication device; providing one or more downlink control bursts from the transmitter of the external communication device in response to the received handshake request, wherein each downlink control burst is defined by a ramped envelope having a burst duration and a peak amplitude; detecting one or more of the downlink control bursts received at the receiver of the implantable medical device, and generating a downlink strength signal representative of the strength of the one or more downlink control signals communicating the downlink strength signal to the external communication device; providing a plurality of downlink data bursts from the transmitter of the external communication device after the handshake is completed, wherein the plurality of downlink data bursts are modulated with data, wherein each downlink data burst is defined by a ramped envelope having a burst duration and a peak amplitude, and further wherein the peak amplitude of the plurality of downlink data bursts being controllable by adjusting the burst duration of the ramped envelope as a function of the downlink strength signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A telemetry system, the system comprising:
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an external communication device, the external communication device including a downlink transmitter operable to transmit one or more downlink control bursts, wherein each downlink control burst is defined by a ramped envelope having a burst duration and a peak amplitude, wherein the downlink transmitter is further operable to transmit a plurality of downlink data bursts, wherein the plurality of downlink data bursts are modulated, by the transmitter, with data, and further wherein each downlink databurst is defined by a ramped envelope having a burst duration and a peak amplitude; and an implantable medical device, the implantable medical device including; a downlink receiver operable to receive one or more downlink control bursts from the downlink transmitter, detection circuitry associated with the downlink receiver to detect the strength of the one or more downlink control bursts transmitted by the downlink transmitter and generate a downlink strength signal representative of the detected strength, and an uplink transmitter operable to transmit the downlink strength signal to the external communication device; and
wherein the external communication device further includes a controller to control the peak amplitude of the plurality of downlink data bursts by adjusting the burst duration of the ramped envelope thereof as a function of the downlink strength signal. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification