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Cardiac monitoring apparatus

  • US 4,412,546 A
  • Filed: 03/19/1981
  • Issued: 11/01/1983
  • Est. Priority Date: 05/09/1979
  • Status: Expired due to Term
First Claim
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1. In an electrical cardiac monitoring system including signalprocessing means, enabling means for enabling said signal processing means, an input circuit path for coupling electrocardiac signals to said signal processing means, switch means coupled so as to change the state of said enabling means from a first state to a second state when said switching means is operated, a first electrode sensing means coupled to a user at a first point, a second electrode sensing means coupled to the user at a second point, power supply means coupled to supply the electrical energy through said user in a first current path between said first and said second points so as to generate a first electrocardiac signal wherein electrocardiac signals supplied along said input circuit path to said signal processing means are processed by said signal processing means only when said enabling means is in said second state, the improvement comprising:

  • a third electrode sensing means coupled to the user at a third point, a fourth electrode sensing means coupled to the user at a fourth point wherein said power supply means is coupled to supply electrical energy in a second current path to said user between said third and fourth points so as to generate a second electrocardiac signal, control means and interconnecting means selectively coupled between said third and said fourth electrode sensing means and said control means wherein said control means is constructed to prevent said first electrocardiac signal being coupled through said first current path and to allow said second electrocardiac signal to be coupled through said input circuit path to said signal processing means when said interconnection means is coupled to said control means and said enabling means is in its second state and further wherein said first electrocardiac signal is coupled through said input circuit path to said signal processing means when said interconnecting means is not coupled to said control means.

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