By P. Attuel M.D., A. Ripart, J. Mugica (auth.), D. W. Behrenbeck, E. Sowton, G. Fontaine, U. J. Winter (eds.)
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Extra resources for Cardiac Pacemakers: Diagnostic Options · Dual Chamber Pacing Rate Responsive Pacing · Antitachycardia Pacing
This last point is very important for a designer as we can look forward to being able to increase ECG time record ing without a drastic reduction of pacemaker longevity. What will the near future bring? Thanks to the time gap between the existing most advanced semi-conductor technology and its application to pacemakers, the near future is now predictable. The memory capacity increase will come from: I. Line width reduction. Present photo lithographic techniques are limited to I micron line width .
Pacemaker functions As mentioned before the capability to transmit the intracardiac electrogram should be incorporated to achieve improved sensitivity adjustment. With regard to the threshold measuring system, the step down mode should be improved. Additionally marker signals should be integrated in order to signalize sensing and pacing. References I. Winter UT, Behrenbeck OW , Brill Th, Hoher M, Hombach V, Hilger HH (1985) Value and limitations of the Holter functions of a single chamber diagnostic pacemaker (this volume) 2.
3. Dynamic CMOS RAM cell : the input capacitor C of a CMOS gate is used as a memory. Another MOS transistor is used to transfer the information from the data line and charge or discharge the capacitor. Fig. 4. Static CMOS RAM cell: C is the data line, R is the read/write command. No static current is needed , but the basic memory cell has six transistors. -_ 50 Reduction of current consumption may be obtained by the use of a more complex cell architecture. e, without any valuable quiescent current consumption, needs 6 transistors (Fig.
Cardiac Pacemakers: Diagnostic Options · Dual Chamber Pacing Rate Responsive Pacing · Antitachycardia Pacing by P. Attuel M.D., A. Ripart, J. Mugica (auth.), D. W. Behrenbeck, E. Sowton, G. Fontaine, U. J. Winter (eds.)