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Interlock system for anesthetic vaporizers

  • US 4,308,865 A
  • Filed: 10/19/1979
  • Issued: 01/05/1982
  • Est. Priority Date: 10/19/1979
  • Status: Expired due to Term
First Claim
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1. An anesthesia machine having an interlock system, said anesthesia machine comprising a manifold, first and second anesthetic vaporizers mounted on said manifold, each of the vaporizers including control means rotatable to open and closed positions, a selector valve mounted on said manifold intermediate the first and second vaporizers, said selector valve having first and second extreme position wherein said first and second vaporizers, respectively, are operable, and said selector valve having a middle position wherein neither of said first and second vaporizers is operable, said interlock system mounted on said manifold and comprising means to prevent rotation of said control means toward the open position of the first vaporizer when said selector valve is in said second extreme position, and to prevent rotation of said control means toward the open position of said second vaporizer when said selector valve is in said first position and to prevent rotation of both control means of said first and second vaporizers toward the open positions when said selector valve is in said middle position.

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