Abstract: Described herein are methods and systems for delivering an analgesic to a patient. The systems and methods including a breathing bag that has an outer shell, which creates a hollow inter cavity. The breathing bag also has an opening at first end, and an opening secured by a check valve at a second end. A tube, or set of tubes, may then be attached to the breathing bag, such that at least one aperture along a portion of the tube is housed within the breathing bag. The check-valve of the breathing bag having an inlet, an outlet, an air passage, a tube attachment, and a flapper. Gas can then pass through the apertures, into the breathing bag, and out to the patient via the check valve.

Abstract: A method of preventing the inserting of a wrong flowmeter tube into an anesthesia machine comprises the steps of forming a selected number of longitudinal ridges at selected places on the inside surface of an upper portion of a flowmeter tube, attempting to insert the upper end portion into a socket pin mounted on the housing of a anesthesia machine, seating the tube on the socket pin if the socket pin exterior surface has grooves corresponding to the number and placement of ridges on the flowmeter tube, and rejecting the tube by the socket pin if the socket pin exterior surface does not have grooves corresponding to the number and placement of the ridges on the flowmeter tube, since the lack of said correspondences indicates that the tube is the wrong tube for the socket pin.

Abstract: A coupler assembly for supplying different fluids has a base member adapted to supply one fluid through a first socket member and a second different fluid through a second spaced socket member. A hose terminal fitting has a pair of spaced tubular plugs of different diameters for entry into said socket members. One of the socket members has a hook which is engaged by a latch on the hose terminal fitting for locking the tubular plugs against withdrawal from the sockets. Advantageously the latch is spring biased into the latching position and has a cam surface to provide for the camming of the latch over the hook as the tubular plugs are moved into the sockets. Preferably the hook lies in a plane substantially perpendicular to the axes of the plugs and the latch is mounted for sliding movement transversely of the hose terminal fitting.