Implantable cardiac pacer having dual frequency programming and bipolar/linipolar lead programmability
First Claim
1. An implantable cardiac pacer having a multi-frequency programming system, comprisingfirst and second registers,first means responsive exclusively to an externally generated programming signal at a lower frequency for decoding said lower frequency signal and storing a corresponding number in said first register,second means responsive exclusively to an externally generated signal at a higher frequency for decoding said higher frequency signal and storing a corresponding number in said second register,pulse generator means for producing output stimulation pulses at a variable rate, andmeans respinsive to the numbers stored in both said first and second registers for iniquely determining the rate of said pulse generator.
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Abstract
The stimulation output of an implanted cardiac pacer is applied between a cathode at the end of a pacer lead in the heart and an anode whose location is programmable. An electronic switch accessed via programming designates the pulse generator case as the anode for an additional electrode located near the end of the pacer lead, thus changing the pacer from unipolar to bipolar operation or vice-a-versa after implantation. Different programming pulse rates are used to program different functional characteristics. For example, pulses at one rate select mode, high or low frequency range, sensitivity and anode location while pulses at another frequency set the pulse generation rate and output current.
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Citations
4 Claims
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1. An implantable cardiac pacer having a multi-frequency programming system, comprising
first and second registers, first means responsive exclusively to an externally generated programming signal at a lower frequency for decoding said lower frequency signal and storing a corresponding number in said first register, second means responsive exclusively to an externally generated signal at a higher frequency for decoding said higher frequency signal and storing a corresponding number in said second register, pulse generator means for producing output stimulation pulses at a variable rate, and means respinsive to the numbers stored in both said first and second registers for iniquely determining the rate of said pulse generator.
Specification