×

Anesthesia rebreathing apparatus

  • US 3,938,551 A
  • Filed: 03/07/1974
  • Issued: 02/17/1976
  • Est. Priority Date: 01/17/1972
  • Status: Expired due to Term
First Claim
Patent Images

1. Overflow valve means useful in a general anesthesia rebreathing system including a breathing circuit, for exhausting gas therefrom, said overflow valve means comprising:

  • a valve housing having an input port, a control port, and an exhaust port and including means for communicating said input port with the gas pressure in at least a portion of said circuit;

    valve element means in said housing normally operative to permit gas flow from said input port to said exhaust port in response to a positive differential pressure thereacross exceeding a first threshold;

    means responsive to a control pressure applied to said control port exceeding a second threshold for closing said valve element means and preventing said normal operation thereof; and

    controller means for selectively coupling different pressure sources to said control port, said controller means including at least first and second input ports and an output port;

    means coupling said controller means output port to said valve housing control port;

    said controller means further including manually actuatable means movable between first and second positions for respectively communicating said first and second input ports with said output port and means responsive to said manually actuatable means for varying the rate of gas flow through said valve housing exhaust port.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×