×

Method and apparatus for managing and monitoring cardiac rhythm using active time as the controlling parameter

  • US 5,235,976 A
  • Filed: 12/13/1991
  • Issued: 08/17/1993
  • Est. Priority Date: 12/13/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A cardiac rhythm management device having a variable rate pulse generator and further comprising:

  • (a) means for measuring intracardiac impedance variations due to changes in blood volume of the heart;

    (b) means for detecting the occurrence of a natural or stimulated cardiac depolarization signal;

    (c) means for computing from said impedance variations the total active time of a cardiac cycle, said total active time being the interval starting with the occurrence of a detected natural or stimulated cardiac depolarization signal and ending with the completion of the filling phase of the heart with the ventricles assumed to be refilled at their fast filling rate;

    (d) means for producing a control signal related to said total active time; and

    (e) means for applying said control signal to said variable rate pulse generator.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×