Patent ID: 6125848
Filing Date: 2000-10-03
Classification: A61B,A61M

Abstract:
A system for determining the tidal volume of a patient undergoing anesthesia, said system comprising a breathing means, including a source of anesthesia, to supply breaths to a patient during an inspiratory cycle and to allow a patient to exhale during an expiratory cycle, a patient breathing circuit having a main delivery tube having a distal end for connection to the breathing means and a proximal end for connection to a patient connector in communication with a patient, the main delivery tube communicating between said breathing means and a patient, a source of fresh gas, a tubing for delivering the fresh gas from said source of fresh gas to the patient connector for delivery to a patient, means to determine the flow of gas within said main delivery tube, means to determine the flow of fresh gas in said tubing during said expiratory cycle, a processor for receiving signals from said means to determine the fresh gas flow in said tubing and the flow of gas in said main delivery tube to provide an accurate measurement of the volume of gas expired by a patient.