Programmable digital cardiac pacemaker with means to override effects of reed switch closure
First Claim
1. The programmable medical device having operating modes or parameters adapted to be programmed by the application thereto of first and second programming signals which include the program data manifesting the desired operating mode or parameter values for the medical device to assume, comprising:
- means responsive to the first programming signal for receiving and storing the second programming signal;
switching means responsive to the first programming signal for switching the operating mode of the medical device from a normal operating mode to a different operating mode; and
disabling means responsive to the program data manifesting certain parameters for disabling said switching means so that the medical device is maintained in its normal operating mode while the medical device is programmed to the certain parameter value.
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Accused Products
Abstract
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 sensitivity 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 exceeding 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 acceptance of a programming signal, and means to reset the program acceptance circuit if extraneous signals are detected as programming signals. The program signal acceptance circuit performs several different checks on the detected programming signal including a parity check, an access code check and determining if the proper number of signals were transmitted within a given time. The timing circuit of the pulse generator includes a crystal clock oscillator and counter means for counting the clock 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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Citations
19 Claims
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1. The programmable medical device having operating modes or parameters adapted to be programmed by the application thereto of first and second programming signals which include the program data manifesting the desired operating mode or parameter values for the medical device to assume, comprising:
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means responsive to the first programming signal for receiving and storing the second programming signal; switching means responsive to the first programming signal for switching the operating mode of the medical device from a normal operating mode to a different operating mode; and disabling means responsive to the program data manifesting certain parameters for disabling said switching means so that the medical device is maintained in its normal operating mode while the medical device is programmed to the certain parameter value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A programmable cardiac pacemaker pulse generator which is programmed by applying first and second programming signal thereto having normally enabled switch means disabled in response to said first programming signal, said second programming signal including data manifesting desired operating conditions for said pulse generator to assume, said pulse generator comprising:
- oscillator means for providing cardiac stimulating pulses;
sensing means responsive to the occurrence of natural activity for providing a signal to said oscillator means to inhibit the provision of said cardiac stimulating pulses;
inhibiting means responsive to said switch means being disabled for preventing the provision of said sensing means signal to said oscillator means; and
means for applying a selected signal to the inhibiting means in response to a certain second programming signal for overriding the inhibiting means and enabling the provision of the sensing means signal to the oscillator means during the programming of certain parameters of said pulse generator which interact with said sensing means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
- oscillator means for providing cardiac stimulating pulses;
Specification