Unitary disposable circle absorption canister assembly

Claim 1

The combination comprising: container means having first, second, and third chambers therein, said second chamber being adjacent to said first and third chambers, a first inlet fitting in said container means communicating with said first chamber, a first outlet fitting in said container means communicating with said third chamber, said first chamber communicating with said third chamber through said second chamber, an absorbent material for carbon dioxide disposed in said second chamber, a plurality of additional fittings in said container means communicating with said chambers, and an anesthesia machine having means receiving said container means thereon, said container means being removable from said anesthesia machine and completely disposable; a venting device having mounting means mounted to one of said additional fittings communicating with said third chamber, said venting device including a valve arranged for closure thereof by a flow of gas therethrough from said third chamber; said venting device valve having a float movable in a passageway between a rest and a seat, said passageway having different cross sectional clearance area with respect to said float at increasing distances from said rest.