Externally controlled tachycardia control pacer
First Claim
1. A tachycardia control pacer comprising means for confirming a tachycardia episode, means for timing a time delay, means responsive to said confirming means for generating at least one heart-stimulating pulse at the end of said time delay following the last heartbeat to terminate said tachycardia episode, means for scanning said time delay through a range during successive cycles of operation of said pulse generating means, externally-controlled means for changing the range through which said time delay is scanned in accordance with externally-generated signals, and means responsive to operation of said externally-controlled means for causing the next time delay to be dependent upon only a time delay last represented by the externally-generated signals and independent of the last time delay controlled by said scanning means.
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Accused Products
Abstract
A tachycardia control pacer for which placing a magnet over the patient'"'"'s chest results in the generation of two pulses, the time separation between which is an indication of the battery potential. Application of the magnet in this way also holds the device off, after the two pulses are generated, so that if the device is causing him discomfort the patient can temporarily disable it until the physician can program it off. Application of a magnet to the patient'"'"'s chest, or programming of the device, resets two scanned inter-pulse time intervals to the values programmed by the physician. The next scanning begins with the programmed time values. In this way the physician, after inducing tachycardia, can verify the programmed time parameters rapidly by observing the patient'"'"'s ECG waveform, without having to wait several minutes until scanning from the previously retained successful values would otherwise progress to the programmed values.
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Citations
5 Claims
- 1. A tachycardia control pacer comprising means for confirming a tachycardia episode, means for timing a time delay, means responsive to said confirming means for generating at least one heart-stimulating pulse at the end of said time delay following the last heartbeat to terminate said tachycardia episode, means for scanning said time delay through a range during successive cycles of operation of said pulse generating means, externally-controlled means for changing the range through which said time delay is scanned in accordance with externally-generated signals, and means responsive to operation of said externally-controlled means for causing the next time delay to be dependent upon only a time delay last represented by the externally-generated signals and independent of the last time delay controlled by said scanning means.
Specification