Method and system for improved spectral efficiency of far field telemetry in a medical device
AssigneeCardiac Pacemakers, Inc.
InventorJeffrey A. Von Arx
Life of this patent
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Abstract
Radio frequency bandwidth from a far field transmitter of an implantable medical device is adjusted by controlling the data rate, the output power level, the transmitter supply voltage or combinations thereof. Adjustments are made on the basis of a sensed temperature, absence or presence of a lead or by way of wave shaping. A Surface Acoustic Wave (SAW) resonator based transmitter exhibits stable bandwidth in a temperature controlled operating environment. For temperatures outside of the range of human body temperature, the output of the SAW-based transmitter is adjusted to provide reduced bandwidth.
Claims52
A system comprising:
- an implantable temperature sensor adapted to provide an output signal based on a sensed temperature;
- an implantable comparator coupled to the sensor and adapted to generate a control signal based on the output signal;
- and
- an implantable wireless transmitter coupled to the implantable comparator and adapted to modulate a transmission bandwidth based on the control signal.
An apparatus comprising:
- a far field transmitter coupled to an implantable medical device, the transmitter having two or more selectable transmission frequency spectrums and a frequency spectrum select means;
- a temperature sensor having an output signal based on a temperature;
- and
- a controller coupled to the frequency spectrum select means and coupled to the output signal, the controller adapted to select one transmission frequency spectrum of the two or more selectable transmission frequency spectrums based on the output signal.
A method comprising:
- sensing a temperature at an implantable device;
- comparing the sensed temperature with a first temperature;
- and
- disabling a far field transmitter of the implantable device if the sensed temperature is greater than the first temperature.
A method comprising:
- sensing a temperature at an implantable device;
- comparing the sensed temperature with a first temperature;
- and
- selecting a reduced output power level of a far field transmitter of the implantable device if the sensed temperature is above the first temperature.
A method comprising:
- sensing a temperature at an implantable device;
- comparing the sensed temperature with a first temperature;
- and
- selecting a reduced telemetry data rate of a far field transmitter of the implantable device if the sensed temperature is above the first temperature.
An apparatus comprising:
- therapy delivery means adapted for implanting in a body;
- sensing means adapted to provide a sense signal based on a temperature;
- processor means coupled to the therapy means;
- first telemetry means coupled to the processor and adapted to communicate using far field transmissions, the first telemetry means having a control input;
- and
- wherein the control input receives a control signal based on the sense signal.
An apparatus comprising:
- a lead detection circuit having a detection output;
- an implantable transmitter having two or more modes of operation;
- and
- a mode selection circuit coupled to the implantable transmitter and adapted to provide a mode selection signal based on the detection output.
A system comprising:
- an implantable therapy circuit;
- a processor coupled to the therapy circuit and having a signal output;
- a filter having a filter input coupled to the signal output and having a filter output;
- and
- an implantable wireless transmitter having a modulation input coupled to the filter output and wherein an output power of the wireless transmitter is modulated as a function of the modulation input.
A system comprising:
- an implantable therapy circuit;
- a processor coupled to the therapy circuit and having a signal output;
- a digital to analog converter having a digital input coupled to the signal output and having an analog output;
- and
- an implantable wireless transmitter having a modulation input coupled to the analog output and wherein an output power of the wireless transmitter is modulated as a function of the modulation input.
A method comprising:
- receiving a signal from an implanted therapy circuit;
- processing the signal to provide a modulation input signal;
- adjusting a far field transmitter power output based on the modulation input signal;
- and
- wirelessly transmitting data based on the signal.
Dependencies are inferred from the claim text.