Cardiac pacemaker with destructible means for selecting...

Details Cardiac pacemaker with destructible means for selecting... Cardiac pacemaker with destructible means for selecting...

A - Human Necessities

61

N

326/1.3

A61N 1/36 (2006.01) H03K 3/01 (2006.01) H03K 3/017 (2006.01)

Patent

CA 1166700

CARDIAC PACEMAKER WITH DESTRUCTIBLE MEANS FOR OUTPUT MODE SELECTION AND METHOD OF MAKING SAME ABSTRACT OF THE DISCLOSURE A cardiac pacemaker which can be manufactured in a wide variety of models having different output modes. There is mode selection circuitry, common to a plurality of output modes, and including a destructible means, such as one or more fusible links. A predetermined link or set of links is fused to select the desired output mode. Selection of an output mode determines a set of output pulse parameters. A variety of pulse rates, pulse widths, hysteresis and refractory modes may be selected. The mode selection circuitry is such that reconnection of the circuit across the fusible links (via dendrites, wire bond chaff, solder balls, etc.) causes the pulse width to widen, pulse rate to go to 70 ppm., the hysteresis to be shut off, and the refractory to go to 325 milliseconds. A subcircuit prevents the outputs of the mode selection circuit from floating when the links are fused.

365617

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