Control member for anaesthesia apparatus

Claim 1

A fluid flow control device for an anesthesia system, comprising; (a) tubular connecting means having a proximal end adapted for connection to a patient and a distal end, (b) a tubular supply member having a distal end adapted for connection to a supply of inhalation fluid and a proximal end, means for securing the proximal end of said tubular supply member in spaced relationship to the distal end of said tubular connecting member, (c) a tubular outlet member having a proximal end, means connecting the proximal end of said tubular outlet member about said distal end of said tubular connecting means and said proximal end of said tubular supply member such that the space between the proximal end of said tubular supply member and the distal end of the tubular connecting member is in direct free fluid communication with said tubular outlet member, said tubular outlet member having a distal end communicating to atmosphere, (d) flow ducting means interposed between the distal end of said tubular connecting member and the proximal end of said tubular supply member, permitting flow of inhalation fluid from said tubular supply member to said tubular connecting means, said flow ducting member acting to direct exhalation fluid from said tubular connecting member directly into said tubular supply member and depending upon a predetermined pressure or volume of inhalation fluid in said tubular supply member into the tubular outlet member for venting to atmosphere, and said flow ducting means comprises a jet secured in a fluid tight manner to said tubular connecting means and having an exit end projecting into the proximal end of said tubular supply member and being radially spaced therefrom.