Patent ID: 7148806

Claim:
An arrangement for use with an anesthesia/ventilation system for a patient, the system including a breathing circuit for supplying breathing gases to the patient for respiration, said breathing circuit having means for flowing inspiratory gas to the patient and means for flowing expiratory gases from the patient through a CO 2 absorber means back to the inspiratory gas flow means, the arrangement comprising: a transponder attached to the absorber means and electronically programmed with desired information including information relating to a CO 2 absorption characteristic of the absorber means; an electronic information transfer means arranged to communicate with said transponder; and electronic computation means, said electronic computation means being couplable to the anesthesia/ventilation system for receiving information relating to the amount of CO 2 introduced in the breathing circuit in the course of respiration by the patient, said electronic computation means receiving information from said transponder, via said electronic information transfer means, relating to a CO 2 absorption characteristic of the absorber means and performing a calculation to make a determination relating to the absorption of CO 2 by the absorber means.