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Anesthetic system having electronic safety interlock system

  • US 5,537,992 A
  • Filed: 05/03/1995
  • Issued: 07/23/1996
  • Est. Priority Date: 05/06/1994
  • Status: Expired due to Term
First Claim
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1. An anesthetic system comprising:

  • a breathing circuit having a connection adaptable for respiratory connection to a patient;

    a source of input gas;

    at least two gas flow paths between said breathing circuit and said source of input gas, said at least two gas flow paths being partially united;

    at least two anesthetic vaporizers respectively disposed in the at least two gas flow paths, each anesthetic vaporizer having an input connected for receiving gas from said source of input gas via said respective gas flow path, and an output connected via said gas flow path for supplying gas containing an anesthetic to said breathing circuit, and a vaporizing valve disposed between said input and said output, and each anesthetic vaporizer having setting means for controlling said vaporizer valve to supply a selected concentration of said anesthetic in said gas to said output;

    at least two blocking valves respectively disposed in the at least two gas flow paths;

    each setting means having an OFF position, at which all setting means are initially set, at which no anesthetic from the anesthetic vaporizer enters into the gas in the gas flow path for that anesthetic vaporizer, and each setting means having an active position, to which each setting means can be individually changed from its OFF position, at which said selected concentration of anesthetic from that anesthetic vaporizer enters into the gas in the gas flow path; and

    a safety system including signal emitter means, in each anesthetic vaporizer, for emitting an activation signal when the setting means in that anesthetic vaporizer is changed from its OFF position to its active position, and control means, supplied with the activation signal, for identifying the anesthetic vaporizer whose setting means is in the active position and for supplying a control signal to the blocking valve for each of a remainder of said anesthetic vaporizers, other than the identified anesthetic vaporizer, for closing said blocking valves and preventing each anesthetic vaporizer in said remainder of anesthetic vaporizers from supplying any anesthetic to said breathing circuit regardless of any subsequent change in the position of the respective setting means of the anesthetic vaporizers in said remainder of anesthetic vaporizers.

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