Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-06-28
1994-09-27
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 60, A61N 102
Patent
active
053504119
ABSTRACT:
An implantable medical device telemetry system provides a means for decoding telemetry downlink information transmitted from an external unit to an implanted medical device, and for encoding telemetry uplink signals to be transmitted from the implanted device to the external unit. A novel system architecture results in a very small telemetry subsystem in the implanted device and a very flexible system adaptable to be used in conjunction with various telemetry formats of various implanted devices. A programmable logic array (PLA) structure that is mask programmable and which may further be partially RAM programmable serves as the basis of the telemetry subsystem. For downlink telemetry, a counter is enabled during intervals of interest in the downlink RF burst stream. The counter value at the end of such an interval is then applied to the variable inputs of the PLA tier decoding in accordance with a selected telemetry protocol. For uplink telemetry, the counter and PLA is used to control transmission of uplink telemetry pulses, such that pulses are pulse-position modulated in accordance with data to be transmitted. Various different telemetry protocols may be supported by the same telemetry circuit, which may be mask-programmed at the time of manufacture to be compatible with one or more different telemetry protocols.
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Busacker James W.
Hochban Robert A.
Ryan Terrence G.
Gadson Gregory P.
Kamm William E.
Medtronic Inc.
Patton Harold R.
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