Synchronous telemetry receiver and receiving method for an implantable medical device
AssigneeCook Pacemaker Corporation
InventorDonald A. Henry
Life of this patent
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Abstract
A synchronous telemetry receiver and receiving method for reception from an implantable medical device of a PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude. Capability is provided for restoring correct phase in the event that a sync pulse is missing or incorrectly received for any reason. A high-frequency clock and counter are provided for counting clock pulses during the time interval between each data pulse and its respective sync pulse in order to obtain a measurement of the time interval.
Claims9
A synchronous telemetry receiver for an implantable medical device, comprising:
- means for receiving a PPM signal from said implantable medical device, said PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude, said plurality of bits including first, second, third and fourth pulses;
- and
- means for measuring the time interval between each data pulse and its respective sync pulse, said measuring means including means for distinguishing between equal-amplitude sync pulses and data pulses.
A synchronous method of receiving telemetry information from an implantable medical device, comprising the steps:
- receiving a PPM signal from said implantable medical device, said PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude, said plurality of bits including first, second, third and fourth pulses;
- and
- measuring the time interval between each data pulse and its respective sync pulse, said measuring step including distinguishing between equal-amplitude sync pulses and data pulses.
Dependencies are inferred from the claim text.