Digital pacemaker with test signal for threshold safety margin

Details Digital pacemaker with test signal for threshold safety margin Digital pacemaker with test signal for threshold safety margin

A - Human Necessities

61

N

326/1.3

A61N 1/36 (2006.01) A61N 1/37 (2006.01) A61N 1/372 (2006.01)

Patent

CA 1149468

DIGITAL CARDIAC PACEMAKER ABSTRACT There is disclosed herein a programmable cardiac pacemaker pulse generator utilizing digital circuitry for controlling the provision of cardiac stimulating pulses. The pulse generator is capable of having the rate, the pulse width, the pulse amplitude, the refractory period, the sen- sitivity and the mode of operation programmed. In addition, the pulse generator can have the output inhibited and can respond to programming signals causing a threshold margin test to be performed, effects of closure of the reed switch overridden, a hysteresis function added and a high rate ex- ceeding the normal upper rate limit programmed. Many of the programmable functions of the pulse generator can either be programmed on a permanent or a temporary basis. The pulse generator further includes means for signaling the accept- ance of a programming signal, and means to reset the program acceptance circuit if extraneous signals are detected as pro- gramming signals. The program signal acceptance circuit per- forms several different checks on the detected programming signal including a parity check, an access code check and de- termining if the proper number of signals were transmitted within a given time. The timing circuit of the pulse genera- tor includes a crystal clock oscillator and counter means for counting theclock pulses therefrom to determine the rate of the pacemaker. The pulse width of each pacemaker pulse is determined by using a voltage controlled oscillator in place of the crystal oscillator to obtain energy compensation due to the battery voltage decreasing with time.

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