The present invention is an improved flow tube for passing inhaled and exhaled gases from a subject between a respiratory connector and a respiratory analyzer as the subject breathes into the respiratory connector for analysis of the user's breadth by the respiratory analyzer. The flow tube includes...http://www.google.co.uk/patents/US20030105407?utm_source=gb-gplus-sharePatent US20030105407 - Disposable flow tube for respiratory gas analysis
