초록 ▼

A programmable pulse generator capable of operating in several atrial and ventricular pacing modes having atrial and ventricular sense amplifiers and output circuits, programmable memory and clock controlled digital timing circuits and a depletable power source. End-of-life sensing circuits detect f

A programmable pulse generator capable of operating in several atrial and ventricular pacing modes having atrial and ventricular sense amplifiers and output circuits, programmable memory and clock controlled digital timing circuits and a depletable power source. End-of-life sensing circuits detect first and second end-of-life depletion levels. Magnet activated end-of-life test circuitry responds to the presense of none, one or both of the end-of-life depletion level signals to alter the operating modes and pacing rates to indicate the orginally programmed mode and the level of depletion to an observer. Preferably, the pulse generator is operated in the asynchronous DOO or VOO modes and at non-programmed test rates to provide the indication.

대표청구항 ▼

A programmable medical device having programmable means responsive to externally applied programming signals for programming the operation of the medical device in one of a plurality of operating modes and operating rates comprising: a depletable power source for powering said medical device; power

A programmable medical device having programmable means responsive to externally applied programming signals for programming the operation of the medical device in one of a plurality of operating modes and operating rates comprising: a depletable power source for powering said medical device; power source energy detecting means coupled to said power source for providing a first end-of-life signal at a first depletion level and a second end-of-life signal at a second depletion level lower than said first depletion level; first rate and mode switching means coupled to said programmable means and said detecting means and responsive to an externally applied testing signal for operating said medical device in a first predetermined mode and at the programmed rate when neither a first nor a second end-of-life signal is present; second rate and mode switching means coupled to said programmable means and said detecting means and responsive to said testing signal for operating said medical device in the first predetermined mode and at a first predetermined rate when said first end-of-life signal is present; and third rate and mode switching means coupled to said programmable means and said detecting means and responsive to said testing signal for operating said medical device in a second predetermined mode and rate when said second end-of-life signal is present.