Angeion Corporation

James Marcotte

Frank R Dropps

Jean-Cheui Hsung

Sharon Johnson

A deterministic and jitter-free dual chamber brady pacemaker utilizes both a programmed microprocessor and a hardware state machine, both of which are coupled to a real time clock (RTC), random access memory (RAM) and a common escape interval timer. Time of occurrence (TOC) data representative of the time and nature of atrial and ventricular sensed events and pacing events is stored in the RAM. Escape interval periods are timed by the escape interval timer. The microprocessor is operable in both an active mode and an inactive mode without interrupts. In response to the receipt of wakeup commands, the microprocessor operates in the active mode and uses the TOC data from the RAM to reset the escape interval timer to a desired next event interval. The hardware state machine uses the common escape interval timer for timing timeout events and atrial and ventricular sensed events such that pacing pulses are delivered in a determinate manner.

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Arden Hills, MN, United States of America

James Marcotte