×

Anesthesia rebreathing apparatus including improved reservoir means

  • US 3,901,230 A
  • Filed: 05/01/1974
  • Issued: 08/26/1975
  • Est. Priority Date: 01/17/1972
  • Status: Expired due to Term
First Claim
Patent Images

1. An anesthesia system for coupling a fresh gas supply means to a patient'"'"''"'"'s airway, said system including:

  • elongated breathing tube means having an open first end adapted to communicate with said airway and an open second end adapted to communicate with said supply means, said breathing tube means providing a flow path in the direction from said airway to said supply means and from said supply means to said airway;

    overflow valve means having an input port and an exhaust port and including valve element means normally seated to hermetically isolate said input and exhaust ports and responsive to a positive pressure exceeding a first threshold from said input to said exhaust side of said valve element means for unseating said valve element means to permit gas flow therepast;

    means mounting said overflow valve means in close proximity to said elongated breathing tube means second end;

    elongated overflow tube means, substantially coextensive with said breathing tube means, having an open first end in communication with said breathing tube means in close proximity to the first end thereof and an open second end coupled to said overflow valve means input port, said overflow tube means providing a flow path in the direction from said breathing tube means to said overflow valve means;

    a reservoir assembly including outer wall means enclosing a volume and inner wall means partitioning said volume into first and second hermetically isolated chambers, said inner wall means being flexible for transmitting pressures between said chambers;

    means for communicating said first chamber with said breathing tube means second end;

    said overflow valve means including a control port and means responsive to the application of a positive pressure exceeding a second threshold to said coNtrol port for seating said valve element means independent of the pressure differential between said input and exhaust sides of said valve element means;

    means for selectively communicating the pressure in said second chamber to said control port;

    container means having a flexible wall capable of being manually squeezed to increase the pressure therein; and

    means for communicating the pressure in said container means to said reservoir assembly second chamber.

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