Dual channel telemetry for implanted medical device

Details Dual channel telemetry for implanted medical device Dual channel telemetry for implanted medical device

1992-06-10

1994-05-24

Cohen, Lee S.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

340573, 370 11, 455102, A61N 100, G08B 2300, H04J 900, H04L 504

Patent

active

053144503

ABSTRACT:
A method of and apparatus for telemetering both analog and digital data transcutaneously between an implantable medical device and an external receiver, such as between an external programmer and an implantable cardiac pacer. A damped carrier at 175 kilohertz is pulse position modulated by digital data. The data, along with synchronization and identification codes, are positioned into predefined ranges within predefined frames as measured by individual time periods. The data is uniquely identified by the position of a burst of the carrier within the predefined range. An automatically initiated hand shake protocol maintains the link over slight variations in programmer head position with an indicator notifying the operator when repositioning is required. Analog data may be transferred in digital form or alternatively transferred using phase modulation of the carrier bursts. A cyclic redundancy code is used for link error detection.

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