Patent ID: 8453641

Claim:
An apparatus for measuring properties of gases being supplied to a patient comprising: a gases supply, at least one delivery conduit including a heater wire for heating said conduit, said conduit having a first end nearest said gases supply and a second end furthest from said gases supply, wherein said heater wire is located within, around or throughout said conduit, said heater wire extending longitudinally along said conduit from at or near said first end of said conduit to at or near said second end of said conduit, and said heater wire being utilised in an electrical circuit to determine said properties of said gases, said electrical circuit having a first portion and a second portion, said first portion of said electrical circuit being located at or near said first end of said conduit and said second portion of said electrical circuit being located at or near said second end of said conduit, said second portion of said electrical circuit being in electrical communication with said first portion of said electrical circuit through said heater wire such that said first portion and said second portion of said electrical circuit through said heater wire can feedback to a controller when said properties of said gases vary.