Heart pacemaker with integrated injection logic energy saving ci

Surgery – Truss – Pad

Patent

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307459, A61N 136

Patent

active

043810101

ABSTRACT:
An implantable heart pacemaker having digital injection integrated circuitry includes a bias switch (70) operative to turn on or increase the bias current to the pulse width logic (50) just prior to an output pulse. Increased bias to the pulse width logic permits high speed operation of the logic to accurately terminate the output pulse at the end of the desired pulse duration. At the end of the output pulse, the bias switch is turned off to return the bias current to a low quiescent value, and in some cases is turned completely off, to conserve battery power. The logic gates used in the pulse width logic are arrayed along one or more current injector "bars" or "rails" formed in the integrated circuit, and the bias switch (70) is connected for controlling the current delivered to those current injectors, so that increased bias need only be supplied to the circuits requiring high switching speed.

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