Patent ID: 6901216

Claim:
A fluid warming cassette comprising: a first polymeric film and a second polymeric film sealed together in predetermined locations to form a tortuous fluid path within a fluid path section of the cassette, the fluid path section is defined by a proximal end of the cassette, a tongue section which extends toward a distal end of the cassette, a first guide rail section and a second guide rail section of the cassette; an inlet tube and an outlet tube for fluid to enter and exit the tortuous fluid path, the inlet and the outlet are positioned at the proximal end; a first guide rail extending from the proximal end to a distal end of the cassette and positioned in the first guide rail section; a second guide rail extending from the proximal end to the distal end and positioned in the second guide rail section; the tongue section extends beyond the fluid path section toward the distal end, the tongue section assists a user insert the cassette into a warmer unit's aperture.