Method and apparatus for communicating between an ambulatory medical device and a control device via telemetry using randomized data

A medical system, comprising:

• a) an ambulatory medical device (MD) comprising MD electronic control circuitry that further comprises at least one MD telemetry system and at least one MD processor that controls, at least in part, operation of the MD telemetry system and operation of the medical device, wherein the medical device is configured to provide a treatment to a body of a patient or to monitor a selected state of the body;
• and
• b) a communication device (CD) comprising CD electronic control circuitry that further comprises at least one CD telemetry system and at least one CD processor that controls, at least in part, operation of the CD telemetry system and operation of the communication device, wherein the CD telemetry system sends messages to or receives messages from the MD telemetry system,
• wherein at least some data portions of at least some messages are modified in preparation for transmission by the medical device or the communication device such that a more uniform spacing of bit transitions exist in the modified data than found in the corresponding data portions prior to preparation for transmission.

A medical system, comprising:

• a) an ambulatory medical device (MD) comprising MD electronic control circuitry that further comprises at least one MD telemetry system and at least one MD processor that controls, at least in part, operation of the MD telemetry system and operation of the medical device, wherein the medical device is configured to provide a treatment to a body of a patient or to monitor a selected state of the body;
• and
• b) a communication device (CD) comprising CD electronic control circuitry that further comprises at least one CD telemetry system and at least one CD processor that controls, at least in part, operation of the CD telemetry system and operation of the communication device, wherein the CD telemetry system sends messages to or receives messages from the MD telemetry system,
• wherein at least some data portions of at least some messages are modified in preparation for transmission by the medical device or the communication device such that a more uniform distribution of byte patterns occur in the transmitted message than in the data portions prior to preparation for telemetry transmission.

A medical system, comprising:

• a) an ambulatory medical device (MD) comprising MD electronic control circuitry that further comprises at least one MD telemetry system and at least one MD processor that controls, at least in part, operation of the MD telemetry system and operation of the medical device, wherein the medical device is configured to provide a treatment to a body of a patient or to monitor a selected state of the body;
• and
• b) a communication device (CD) comprising CD electronic control circuitry that further comprises at least one CD telemetry system and at least one CD processor that controls, at least in part, operation of the CD telemetry system and operation of the communication device, wherein the CD telemetry system sends messages to or receives messages from the MD telemetry system,
• wherein at least some data portions of at least some messages are modified by a randomization algorithm in preparation for transmission from a first of the device or communication device to a second of the communication device or device.

A medical system, comprising:

• a) an ambulatory medical device (MD) comprising MD electronic control circuitry that further comprises at least one MD telemetry system and at least one MD processor that controls, at least in part, operation of the MD telemetry system and operation of the medical device, wherein the medical device is configured to provide a treatment to a body of a patient or to monitor a selected state of the body;
• and
• b) a communication device (CD) comprising CD electronic control circuitry that further comprises at least one CD telemetry system and at least one CD processor that controls, at least in part, operation of the CD telemetry system and operation of the communication device, wherein the CD telemetry system sends messages to or receives messages from the MD telemetry system,
• wherein messages sent between the communication device and the device comprise a transmission preamble, an op-code for identifying the type of message being transmitted, a data portion, and an error checking code,
• wherein, on a predetermined basis, segments of information are added to the data portion of the message prior to transmission, by the medical device or the communication device,
• wherein each segment of information includes at least one bit transition, and
• wherein at least two bits with opposite values are added to the data portion within a number of bits of data to be transmitted.